Amana PHB**C Service manual

Service
Instructions
Model and Manufacturing
numbers listed on page 6
PHB**C, PHD**C PACKAGE HEAT PUMPS
PGA**C, PGB**C, PGD**C PACKAGE GAS &
PCC**C PACKAGE COOLERS
This manual is to be used by qualified HVAC
technicians only. Amana does not assume
any responsibility for property damage or
personal injury for improper service procedures done by an unqualified person.
RS6300003
February 2000
INDEX
PRODUCT IDENTIFICATION ................................................................................. 5 - 11
PRODUCT DESIGN
Electrical Wiring ............................................................................................. 12 - 13
Gas Piping ..................................................................................................... 13 - 15
SYSTEM OPERATION
Refrigeration Cycle ........................................................................................ 16 - 18
Sequence of Operation ................................................................................. 19 - 20
Electric Heaters ............................................................................................. 21
SCHEDULED MAINTENANCE ............................................................................... 22
SERVICING ............................................................................................................. 23 - 55
WIRING SCHEMATICS
Package Heat Pump ..................................................................................... 56 - 59
PHCB Electric Heater Kits ............................................................................. 60
2
IMPORTANT INFORMATION
Pride and workmanship go into every product to provide our customers with quality products. It is possible,
however, that during its lifetime a product may require service. Products should be serviced only by a qualified
service technician who is familiar with the safety procedures required in the repair and who is equipped with the
proper tools, parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.
IMPORTANT NOTICES
WARNING
IF REPAIRS ARE ATTEMPTED BY UNQUALIFIED PERSONS, DANGEROUS
CONDITIONS (SUCH AS EXPOSURE TO ELECTRICAL SHOCK) MAY RESULT. THIS MAY CAUSE SERIOUS INJURY OR DEATH.
AMANA WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES. IF YOU PERFORM SERVICE ON YOUR OWN PRODUCT, YOU
ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH MAY
RESULT.
CAUTION
To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this
product. For further assistance, please contact:
CONSUMER AFFAIRS DEPT.
AMANA REFRIGERATION, INC.
AMANA, IOWA 52204
OR
CALL
1-319-622-5511
and ask for
Consumer Affairs
If outside the United States contact:
AMANA REFRIGERATION, INC.
ATTN: INTERNATIONAL DIVISION
AMANA, IOWA 52204, USA
Telephone: (319) 622-5511
Facsimile: (319) 622-2180
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS
DANGER
DANGER - Immediate hazards which WILL result in
severe personal injury or death.
WARNING
WARNING - Hazards or unsafe practices which COULD
result in severe personal injury or death.
CAUTION
CAUTION - Hazards or unsafe practices which COULD
result in minor personal injury or product or property damage.
3
IMPORTANT INFORMATION
WARNING
SYSTEM CONTAMINANTS, IMPROPER SERVICE PROCEDURE AND/OR PHYSICAL ABUSE AFFECTING HERMETIC COMPRESSOR ELECTRICAL TERMINALS MAY CAUSE DANGEROUS SYSTEM VENTING.
System contaminants, improper Service Procedure and/or physical abuse affecting hermetic compressor electrical terminals may cause dangerous system venting.
The successful development of hermetically sealed refrigeration compressors has completely sealed the compressor's
moving parts and electric motor inside a common housing, minimizing refrigerant leaks and the hazards sometimes
associated with moving belts, pulleys, or couplings.
Fundamental to the design of hermetic compressors is a method whereby electrical current is transmitted to the compressor motor through terminal conductors which pass through the compressor housing wall. These terminals are
sealed in a dielectric material which insulates them from the housing and maintains the pressure tight integrity of the
hermetic compressor. The terminals and their dielectric embedment are strongly constructed, but are vulnerable to
careless compressor installation or maintenance procedures and equally vulnerable to internal electrical short circuits
caused by excessive system contaminants.
In either of these instances, an electrical short between the terminal and the compressor housing may result in the loss
of integrity between the terminal and its dielectric embedment. This loss may cause the terminals to be expelled, thereby
venting the vaporous and liquid contents of the compressor housing and system.
A venting compressor terminal normally presents no danger to anyone providing the terminal protective cover is properly
in place.
If, however, the terminal protective cover is not properly in place, a venting terminal may discharge a combination of
(a) hot lubricating oil and refrigerant
(b) flammable mixture (if system is contaminated with air)
in a stream of spray which may be dangerous to anyone in the vicinity. Death or serious bodily injury could occur.
Under no circumstances is a hermetic compressor to be electrically energized and/or operated without having the terminal protective cover properly in place.
See Service Section S-17 for proper servicing.
4
PRODUCT IDENTIFICATION
P G B
24 C 045
2
Product Type
D
Engineering Revision
Single Package
Cooling/Heating
Voltage
2: 230V/60Hz/1ph
Product Family
G - Gas/Electric
H - Heat Pump
C - Cooling
Heating Input
Product Series
00:
A: 10 SEER Line
B: 11 SEER Line
C: 12 SEER Line
D: 13 SEER Line
Nominal Capacity
24:
30:
36:
42:
48:
60:
24000
30000
36000
42000
48000
60000
BTUH
BTUH
BTUH
BTUH
BTUH
BTUH
045:
070:
090:
115:
140:
HEAT PUMPS
No heat inst.
GAS PACKS
45000 BTUH
70000 BTUH
90000 BTUH
115000 BTUH
140000 BTUH
Design Sequence
5
PRODUCT IDENTIFICATION
Model #
Manufacturing #
Description
Package Gas (A) 10 Seer gas/electric units. New chassis design with
PGA60C0902D
P1217301C-P1217302C smaller footprint. PGA models have stronger blower performance for down
PGA60C1152D
shot applications.
Package Gas (A) 10 Seer gas/electric units. Changed from 26" fan blade to
PGA60C0902D
P1220301C-1220302C 22" fan blade to improve operating sound. PGA models have stronger blower
PGA60C1152D
performance for down shot applications.
Package Gas (A) 10 Seer gas/electric units. Changed from Smart Valve
PGA60C0902E
P1231901C-P1231902C system to "DSI" direct spark ignition systems. PGA models have stronger
PGA60C1152E
blower performance for down shot applications.
PGB**C***2D
P1213601C-P1213608C Package Gas (B) 11 Seer gas/electric units. New chassis design with
P1217201C-P1217207C smaller footprint.
PGB**C***2D
P1220201C-P1220207C Package Gas (B) 11 Seer gas/electric units. Changed from 26" fan blade to
P1222201C-P1222208C 22" fan blade to improve operating sound.
PGB**C***2E
P1231701C-P1231708C Package Gas (B) 11 Seer gas/electric units. Changed from Smart Valve
P1231801C-P1231807C system to "DSI" direct spark ignition systems.
PGD**C***2D
P1204301C-P1204308C
PGD**C***2D
PGD**C***2E
PHB**C02D
PHB**C02E
PHB**C02E
PHB**CC2E
PHD**C02E
PHD**CC2E
PCC**C02E
P1222301C-P1222308C
P1231402C-P1231407C
P1232001C-P1232008C
P1232101C-P1232107C
P1214402C-P1214404C
Package Gas (D) 13 Seer gas/electric units. New chassis design with
smaller footprint.
Package Gas (D) 13 Seer gas/electric units. Changed from 26" fan blade to
22" fan blade to improve operating sound.
Package Gas (D) 13 Seer gas/electric units. Changed from Smart Valve
system to "DSI" direct spark ignition systems.
Package Heat Pump (B) 11 Seer heat pump units. New chassis design with
smaller footprint.
Package Heat Pump (B) 11 Seer heat pump units. New chassis design with
smaller footprint. Improved heating capacity
Package Heat Pump (B) 11 Seer heat pump units. Changed from 26" fan
P1220101C-P1220106C
blade to 22" fan blade to improve operating sound.
Package Heat Pump (B) 11 Seer heat pump units. New chassis design with
P1228101C-P1228103C
smaller footprint. With 10 K.W. factory installed heat strips.
P1204501C-P1204503C
Package Heat Pump (D) 13 Seer heat pump units. New chassis design with
smaller footprint.
Package Heat Pump (D) 13 Seer heat pump units. New chassis design with
P1228201C-P1228203C
smaller footprint. With 10 K.W. factory installed heat strips.
P1224301C-P1224305C
P1231101C-P1231106C
Package Cooling (D) 12 Seer electric heat electric cooling units. New
chassis design with smaller footprint.
Accessories
6
PHCB**C1
P1219401C-P1219406C
SPK**A
P1221701C-P1221706C
PRC06A1
PRC07A1
PRC07A1
P1219801C-P1219803C
PDTROU4A
PDTROU6A
P9850603C-P9850604C
Package Heat kit with Circuit Breakers. Electric heat kits include breakers for
electric heat only.
Single Point power connection Kit. Kit allows for one circuit to provide power
supply for package heat pumps (PHB/PHD**C) and coolers (PCC**C). Kit
includes circuit breaker for compressor.
Package Roof Curb Kit. Accessory roof curb for roof top/down discharge
installations. PRC06A1 is designed for package heat pumps and coolers.
PRC07A1 is designed for package gas units. PRC07A1 is a combo curb and
will adapt to either footprint.
Package Duct TRansition Over-Under kit. Transition converts side by side to
over-under duct connections. Early model Amana units (EPCG, EPHO, EP,
and PHK) had over-under duct connections.
PRODUCT IDENTIFICATION
Additional Amana accessories, as described below, can be purchased to fit specific application needs. Accessories can
be ordered by the following part numbers and each accessory includes its own separate instructions.
ACCESSORY
PART NUMBER
DESCRIPTION
Duct Transition Round
RSDK01A (24-60)
Converts existing round duct connections to rectangular. Used to install
the horizontal duct cover kit on heat pump units.
Duct Transition
Over/Under
PDTR0U4A (Sm Chassis)
PDTR0U6A (LG Chassis)
Converts existing side by side duct connections to over & under
ductwork. (For replacement purposes). Some Amana preceding units
had over & under ductwork. For use on all Amana Package Units.
Roof Curbs
PRC06A1
PRC07A1
PRC08A1
Roof top mounting/support system for package units. Must be used when
unit is installed in downflow applications. PRC06A fits Package heat
pump and coolers. PRC07A1 fits Package gas/electric units. PRC08A1
is a combo roof curb adaptable to either footprint.
Horizontal Duct Cover
Kits
CHK001A
CHK002A
CHK601A (6 PACK)
Blocks off horizontal discharge. Used for downflow applications. For use
on all Amana Package Units.
50°F Compressor
Lockout
LOK501A
Prevents mechanical cooling at ambients below 50°F. For use on all
Amana Package Units.
Ambient Thermostat Kit
ATK01
This kit controls the staging of electric heat and allows supplemental
heat to be energized only when a set outdoor temperature is reached.
This will allow the system's heat output to more closely match the
building's load. For use on heat pump and cooling package units.
Compressor Sound
Blankets
CSB04A
CSB07A
CSB08A
CSB09A
Compressor sound blankets reduce the ambient noise level of the
package units. Used in installations where extra quite operation is
desired. For use on all Amana Package Units.
Propane Gas Conversion LPTK07A
Kit
LPTK09
Converts package gas units from natural gas to propane gas operation
Electric Heater Kits
PHCB05C1
PHCB10C1
PHCB15C1
PHCB20C1
4.8KW
1ph - 30 Amp Circuit Breaker
9.6KW
1ph - 50 Amp Circuit Breaker
14.4KW 1ph - 30 & 50 Amp Circuit Breakers
19.2KW 1ph - 2-50 Amp Circuit Breakers
For use on heat pump and cooling package units.
Single Point Wiring Kits
SPK04A
SPK05A
SPK06A
SPK07A
SPK08A
SPK09A
Single point wiring kit allows one electrical supply connection to power
both heater kit and package unit. For use on heat pump and cooling
package units.
THERMOSTATS
THSMEC1H2BA
THSADC1H2BA
THSMDC1H2BA
THSMDC1H3BA
1213401
1213403
1213404
1213405
1213701
1214901
C5200607
M0380101
D6853512
D6853510
D9945801
D9807604
Manual changeover - 2 Stage Heat
Auto changeover - 2 Stage Heat
Manual changeover - 2 Stage Heat
Auto changeover - 3 Stage Heat
Electronic programmable - 1 Stage Heat, 1 Stage Cool
Electronic non-programmable - 2 Stage Heat, 1 Stage Cool
Electronic non-programmable - 2 Stage Heat, 1 Stage Cool
Electronic programmable - 2 Stage Heat, 1 Stage Cool
Electronic programmable - 1 Stage Heat, 1 Stage Cool
Electronic programmable - 2 Stage Heat, 2 Stage Cool
Manual changeover - 1 Stage Heat, 1 Stage Cool
Manual changeover - 1 Stage Heat, 1 Stage Cool
Auto changeover - 1 Stage Heat, 1 Stage Cool
Auto changeover - 2 Stage Heat, 1 Stage Cool
Manual changeover - 2 Stage Heat, 1 Stage Cool
Electronic programmable - 1 Stage Heat, 1 Stage Cool
7
PRODUCT IDENTIFICATION
FOR YOUR SAFETY
READ BEFORE OPERATING
WARNING If you do not follow these instructions
LIRE AVANT DE METTRE
EN MARCHELIRE
AVERTISSEMENT: Ouiconque ne respcte pas `a
la lettre les instructions dans le present manuel risque
de declencher un incendie ou une explosion entrainant
des dommages materiels, des lesions corporelles ou la
perte de vies humaines.
exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
A. This appliance is equipped with an ignition device
which automatically lights the pilot. Do not try
to light the pilot by hand.
B. BEFORE OPERATING smell all around the appliance
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will
settle on the floor.
A.Cet appareil est muni d'un dispositif d'allumage
qui allume automatiqement la veilleuse. Ne pas
tenter d'allumer la veillese manuellement.
B. AVANT DE LE FAIRE FONCTIONNER,
renifler tout autour de l'appariel pour deceler
une odeur de gaz. Renifler pres du plancher, car
certains gaz sont plus lourds que l'air et
peuvent s'accmuler a niveau du sol.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electric switch;
Do not use any phone in your building.
Immediately call your gas spplier from a neighbor's
phone. Follow the gas supplier's instructions.
If you cannot reach your gas spplier,
call the fire department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by
hand, don't try to repair it, call a qualified service
technician. Force or attempted repair may result in a fire
or explosion.
D. Do not use this appliance if any part has been underwater.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control
system and any gas control which has been underwater.
QUE FAIRE S'IL Y A UNE ODEUR DE GAZ
Ne pas tenter d'allumer l'appariel.
Ne toucher aucun interrupteur electrique;
n'utiliser aucun telephone dans le batiment.
Appeler immediatement le fournisseur de gaz
en employant le telephone dun voisin.
Respecter a la lettre les instructions du
fournisseur de gaz.
Si personne ne repond, appeler le service des
incendies.
C. Ne pousser ou tourner la manette d'admission du gaz
qu'a la main; ne jamais emploer d'outil a cet effet.
Si la manette reste coincee, ne pas tenter de la
reparer; appeler un technicien qalifie. Quiconque
tente de forcer la manette ou de la reparer peut
declencher une explosion ou un incendie.
D. Ne pas se servir de cet appareil s'il a ete plonge
dans l'eau, completement ou en partie. Appeler un
technicien qualifie pour inspecter l'appareil et
remplacer tout partie du systeme de controle et
toute commande qui ont ete plonges dans l'eau.
OPERATING INSTRUCTIONS
MISE EN MARCHE
1.
1. STOP. Read the safety information above on
this label.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
OFF
4. This appliance is equipped with an ignition
device which automatically lights the pilot.
Do not try to light the pilot by hand.
5. Turn the gas control knob clockwise
to
"OFF" position. Do not force.
6. Wait five (5) mintes to clear ot any gas. Then
smell for gas, including near the floor. If you
then smell gas, STOP. Follow "B" in the safety
information above on this label.
ROBINET A GAZ
if you don't smell gas, go to
MANUEL, EN POS
next step.
"ON/MARCHE"
7. Turn gas control knob
GAS
counterclockwise
to "ON".
INLET
8. Replace access panel.
9. Turn on all electrical
power to the appliance.
ARRIVEE
10. Set thermostat to desired setting.
DU GAZ
11. If the appliance will not operate,
MANUAL GAS
follow the instrctions "To Turn
KNOB SHOWN
Off Gas To Appliance" and call your
IN "ON" POS
service technician or gas company.
ON
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electrical power to the appliance
if service is to be performed.
3. Turn the gas control knob clockwise
to
"OFF" position. Do not force.
4. Replace control access panel.
ARRETER!. Lisez les instrcutions de securite sur
la portion superleure de cette etiquette.
2. Regler le thermostat a la temperature la plus basse.
3. Couper l'alimentation electrique de l'appareil.
4. Cet appareil est muni d'un dispositif d'allumage qui
allume automatiquement la veilleuse. Ne pas tenter
d'allumer la veilleuse manuellement.
5. Torner le robinet a gaz dans le sens des aiguilles
d'une montre
en position "OFF/ARRET"
Ne pas forcer.
6. Attendre cinq (5) minutes pour laisser echapper tout le
gaz. Renifler tout autour de l'appareil, y compris pres du
plancher, pour deceler une odeur de gaz. Si c'est le cas,
ARRETER!. Passer a l'etape B des instructions de secuurite
sur la portion superieure de cette etiquette.
S'il n'y a pas d'odeur de gaz, passer a l'etape sulvante.
7. Tourner le robinet a gaz dans le sens inverse des
aiguilles d'une montre
en pos "ON/MARCHE".
8. Remettre en place le panneau d'acces.
9. Mettre l'appareil sous tension.
10. Regler le thermostat a la temperature desiree.
11. Si l'appareil ne se met pas en marche, suivre les
instrcutions intitulees Comment couper l'admission
de gaz de l'appareil et appeler un technicien
qualifie ou le fournisseur de gaz.
POUR COUPER L'ADMISSION
DE GAZ DE L'APPAREIL
1. Regler le thermostat a la temperature la plus basse.
2. Couper l'alimentation electrique de l'appareil s'il
faut proceder a des operations d'entretien.
3. Tourner le robinet a gaz dans le sens des aiguilles
d'une montre
en position "OFF/ARRET".
Ne pas forcer.
4. Remettre en place le panneau d'acces.
11072705
8
PRODUCT IDENTIFICATION
WARNING
36" Side
Clearance
for Servicing
Recommended
24" Clearance
(Condenser End)
TO PREVENT POSSIBLE DAMAGE, THE UNIT
SHOULD REMAIN IN AN UPRIGHT POSITION DURING ALL RIGGING AND MOVING OPERATIONS. TO
FACILITATE LIFTING AND MOVING IF A CRANE IS
USED, PLACE THE UNIT IN AN ADEQUATE CABLE
SLIDE.
36"
Maximum
Overhang
48" Minimum
Overhang
Vinyl Coated
Canvas
Connections
Insulated
Return
Duct
Minimum 9" Clearance
to Combustibles
36" Clearance for
Service Required
0" Minimum
Clearance to
Combustibles
Insulated
Supply
Duct
In installations where the unit is installed above ground level
and not serviceable from the ground (Example: Roof Top
installations) the installer must provide a service platform for
the service person with rails or guards in accordance with
local codes or ordinances or in their absence with the latest
edition of the National Fuel Gas Code ANSIZ223.1.
NOTE: The flue outlet hood and air inlet hood (Package Gas Units) are
packaged separately inside the unit and must be installed prior to operation.
IMPORTANT: If using bottom discharge with roof curb,
ductwork should be attached to the curb prior to installing
the unit.
Refer to Roof curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with
the National Roofing Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging unit, center of gravity will cause condenser end to be
lower than supply air end.
Amana Package Units are designed for outdoor installations only in either residential or light commercial applications.
The connecting ductwork (Supply and Return) can be connected for either horizontal or down discharge airflow.
140,000 BTU gas package units and PHB60C package
units are not recommended for down discharge airflow
applications. In the down discharge applications a matching Roof Curb is recommended
A return air filter must be installed behind the return air
grille(s) or provision must be made for a filter in an accessible location within the return air duct. The minimum filter area should not be less than those sizes listed in the
Specification Section. Under no circumstances should
the unit be operated without return air filters.
A 3/4" tube is provided for removal of condensate water
from the indoor coil. In order to provide proper condensate flow, a drain trap is built into the unit. (Do not reduce
the drain line size).
Refrigerant flow control is achieved by use of restrictor
orifices or thermostatic expansion valves (TXV).
Package Heat Pump models use a combination of
restrictor orifices and thermostatic expansion valves for
refrigerant flow control.
Some heat pump models also have a suction line accumulator installed between the reversing valve and the compressor. The object of the accumulator is to:
1. Provide a liquid refrigerant storage vessel during prolonged system off cycles.
NOTE: Units can also use roof curb (and platform for leveling, where
necessary) to utilize bottom discharge.
2. Store excess liquid refrigerant not needed by the system while running.
3. Return to the compressor at a controlled rate oil and
saturated vapor.
4. Retain stored excess refrigerant during a sudden system pressure fluctuation such as seen in defrost cycles.
9
PRODUCT IDENTIFICATION
1"
42-3
/8"
"
35
14"
SUPPLY
19-3
RETURN
/16"
19-3
"
19
/16"
PRC06A1 ROOF CURB
12"
8"
-3/
2
4
47"
2"
SUPPLY
RETURN
"
25
25"
"
12
2"
PRC07A1 ROOF CURB
10
14"
PRODUCT IDENTIFICATION
1
14
42 3/8
24 3/8
47
2
RETURN
SUPPLY
14
12
14
35
INSULATED PLATFORM
UNIT SUPPORT
PRC08A ROOF CURB
J
A
H
1.00"
G
B
F
E
D
C
OVER/UNDER DUCT TRANSITION
AMANA MODEL
PDTROU4A
PDTROU6A
Duct Transition
Over/Under
"A" DIM "B" DIM "C" DIM "D" DIM "E" DIM "F" DIM "G" DIM "H" DIM "J" DIM
42"
42"
26 7/16"
32"
PDTROU4A
PDTROU6A
12"
12"
26 1/4"
39 1/2"
15"
15"
6 7/8"
10"
20 11/16"
20 11/16"
9/16"
1"
9/16"
9/16"
Converts existing side by side duct connections to over/under ductwork.
(For replacement purposes. Amana's preceding units had over/under
ducts.)
11
PRODUCT DESIGN
The single phase units use permanent split capacitors (PSC)
design compressors. Starting components are therefore
not required. A low MFD run capacitor assists the compressor to start and remains in the circuit during operation.
The outdoor fan and indoor blower motors are single phase
capacitor type motors.
Air for condensing (cooling cycle) or evaporation (heating
cycle) is drawn through the outdoor coil by a propeller fan,
and is discharged vertically out the top of the unit. The
outdoor coil is designed for .0 static. No additional restriction (ductwork) shall be applied.
Conditioned air is drawn through the filter(s), field installed,
across the coil and back into the conditioned space by the
indoor blower.
Package Heat Pump indoor sections are designed to accept optional components such as auxiliary electric heaters and circuit breakers. Provisions for these components
have been made at time of manufacture.
Some models of PGA, PGB, & PGD series package units
use the Compliant Scroll compressor, there are a number
of design characteristics which are different from the traditional reciprocating compressor.
-
Due to their design Scroll compressors are inherently
more tolerant of liquid refrigerant. NOTE: Even though
the compressor section of a Scroll compressor is more
tolerant of liquid refrigerant, continued floodback or
flooded start conditions may wash oil from the bearing
surfaces causing premature bearing failure.
-
These Scroll compressors use white oil which is compatible with 3GS. 3GS oil may be used if additional oil
is required.
-
Phase 1 Scroll compressors (ZR**K1 or ZR**K2), the
compressor may run backwards (noisy operation) for 1
or 2 seconds at shutdown. This is normal and does not
harm the compressor.
-
Phase 2 Scroll compressors (ZR**K3). On shutdown,
the scroll flanks will separate allowing the compressor
to equalize internally within 0.4 seconds after shutdown.
-
Operating pressures and amp draws may differ from
standard reciprocating compressors. This information
may be found in the "Cooling Performance Data" section.
The scroll is a simple compression concept first patented in
1905. A scroll is an involute spiral which, when matched
with a mating scroll form as shown (next page), generates
a series of crescent shaped gas pockets between the two
members.
During compression, one scroll remains stationary (fixed
scroll) while the other form (orbiting scroll) is allowed to
orbit (but not rotate) around the first form.
12
As this motion occurs, the pockets between the two forms
are slowly pushed to the center of the two scrolls while simultaneously being reduced in volume. When the pocket
reaches the center of the scroll form, the gas, which is now
at a high pressure, is discharged out of a port located at the
center.
During compression, several pockets are being compressed
simultaneously, resulting in a very smooth process. Both
the suction process (outer portion of the scroll members)
and the discharge process (inner portion) are continuous.
ELECTRICAL WIRING
WARNING
TO AVOID THE RISK OF ELECTRICAL SHOCK, WIRING TO THE UNIT MUST BE PROPERLY POLARIZED
AND GROUNDED.
WARNING
TO AVOID ELECTRICAL SHOCK, INJURY OR DEATH,
DISCONNECT ELECTRICAL POWER BEFORE CHANGING ANY ELECTRICAL WIRING.
The units are designed for operation on 60 hertz current
and at voltages as shown on the rating plate. All internal
wiring in the unit is complete. It is necessary to bring in the
power supply to the pigtails or power block, which is located in the junction box or circuit breaker box assembly
(or compressor contactor on package gas units) , as shown
on the unit wiring diagram which is supplied with the unit.
The 24V wiring must be connected between the unit control panel and the room thermostat.
LINE VOLTAGE WIRING
Power supply to the furnace must be N.E.C. Class 1, and
must comply with all applicable codes. The furnace must
be electrically grounded in accordance with the local codes
PRODUCT DESIGN
or, in their absence, with the latest edition of the National
Electrical Code, ANSI/NFPA No. 70, or in Canada, Canadian Electrical Code, C22.1, Part 1. A fused disconnected
must be provided and sized in accordance with the unit
minimum circuit ampacity.
The best protection for the wiring is the smallest fuse or
breaker which will hold the equipment on line during normal operation without nuisance trips. Such a device will
provide maximum circuit protection.
DO NOT EXCEED THE MAXIMUM OVERCURRENT DEVICE SIZE SHOWN ON THE UNIT DATA PLATE.
All line voltage connections must be made through weather
proof fittings. All exterior power supply and ground wiring
must be in approved weather proof conduit. Low voltage
wiring from the unit control panel to the thermostat requires
coded cable. Unit knock out sizes are shown in the specification tables.
The unit transformer is connected for 230V operation. If
the unit is to operate on 208V, reconnect the transformer
primary lead and the induced draft blower leads as shown
on the unit wiring diagram.
WARNING
TO AVOID THE RISK OF FIRE, PROPERTY DAMAGE
OR PERSONAL INJURY, USE ONLY COPPER CONDUCTORS.
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the package unit, the wiring
must comply with all local codes. This wiring must have a
minimum temperature rating of 105°C. and must be routed
away from the burner compartment. All line voltage splices
must be made inside the furnace junction box.
GAS SUPPLY AND PIPING
Package Gas Units
CAUTION
THIS PACKAGE GAS UNIT IS FACTORY SET TO OPERATE ON NATURAL GAS AT THE ALTITUDES SHOWN
ON THE RATING PLATE. IF OPERATION ON PROPANE
IS REQUIRED, OBTAIN AND INSTALL THE PROPER
CONVERSION KIT(S) BEFORE OPERATING THIS FURNACE. FAILURE TO DO SO MAY RESULT IN UNSATISFACTORY OPERATION AND OR EQUIPMENT DAMAGE.
The rating plate is stamped with the model number, type of
gas, and gas input rating. Make sure the furnace is equipped
to operate on the type of gas available.
INLET GAS PRESSURE
NATURAL
MIN. 5.0", MAX. 10.0"
PROPANE
MIN. 11.0", MAX. 14.0"
Inlet Gas Pressure Must Not Exceed the Maximum Value
Shown in the table Above.
The minimum supply pressure must not be varied downward because this could lead to unreliable ignition. In addition, gas input to the burners must not exceed the rated
input shown on the rating plate. Overfiring of the furnace
could result in premature heat exchanger failure.
GAS PIPING
CAUTION
TO AVOID POSSIBLE UNSATISFACTORY OPERATION
OR EQUIPMENT DAMAGE DUE TO UNDERFIRING OF
EQUIPMENT, DO NOT UNDERSIZE THE NATURAL GAS
/PROPANE PIPING FROM THE METER/TANK TO THE
FURNACE. WHEN SIZING A TRUNK LINE PER THE
TABLES, INCLUDE ALL APPLIANCES ON THAT LINE
THAT COULD BE OPERATED SIMULTANEOUSLY.
The gas pipe supplying the furnace must be properly sized
based on the cubic feet per hour of gas flow required, specific gravity of the gas and length of the run. The gas line
installation must comply with local codes, or in the absence
of local codes, with the latest edition of the National Fuel
Gas Code ANSI Z223.1.
NATURAL GAS CAPACITY OF PIPE IN CUBIC FEET
OF GAS PER HOUR (CFH)
LENGTH OF
PIPE IN FEET
10
20
30
40
50
60
70
80
90
100
NOMINAL BLACK PIPE SIZE
1/2"
132
92
73
63
56
50
46
43
40
38
3/4"
278
190
152
130
115
105
96
90
84
79
1"
520
350
285
245
215
195
180
170
160
150
1 1/4"
1050
730
590
500
440
400
370
350
320
305
1 1/2"
1600
1100
980
760
670
610
560
530
490
460
BTUH FURNACE INPUT
CFH = CALORIFIC VALUE OF GAS
CONNECTING THE GAS PIPING - NATURAL GAS
Refer to the figure 1 for the general layout of the furnace.
The following rules apply:
1. Use black iron or steel pipe and fittings for the building
piping.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
13
PRODUCT DESIGN
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum of
three inches long.
5. Use two pipe wrenches when making connection to the
gas valve to keep it from turning.
6. Install a manual shut off valve. This shut off valve should
be conveniently located within six (6) feet of the unit,
and between the meter and unit.
7. Tighten all joints securely.
8. The furnace shall be connected to the building piping
by one of the following:
The unit and its gas connections must be leak tested before placing in operation. Because of the danger of explosion or fire, never use a match or open flame to test for
leaks. Never exceed specified pressure for testing. Higher
pressure may damage the gas valve and cause overfiring
which may result in heat exchanger failure.
This unit and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/
2 psig (3.48 kPa).
This unit must be isolated from the gas supply system by
closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.48 kPa).
a.
Rigid metallic pipe and fittings.
b.
Semirigid metallic tubing and metallic fittings. Aluminum alloy tubing shall not be used in exterior
locations.
TANKS AND PIPING - PROPANE UNITS
c.
Listed gas appliance connectors used in accordance with the terms of their listing that are completely in the same room as the equipment.
PERSONAL INJURY HAZARD
d.
In "b" and "c" above, the connector or tubing shall
be installed so as to be protected against physical and thermal damage. Aluminum-alloy tubing
and connectors shall be coated to protect against
external corrosion where they are in contact with
masonry, plaster, or insulation or are subject to
repeated wettings by such liquids as water (except rain water), detergents, or sewage.
WARNING
IRON OXIDE (RUST) CAN REDUCE THE LEVEL OF
ODORANT IN PROPANE GAS. A GAS DETECTING DEVICE IS THE ONLY RELIABLE METHOD TO DETECT A
PROPANE GAS LEAK. CONTACT YOUR LOCAL PROPANE SUPPLIER ABOUT INSTALLING A GAS DETECTING WARNING DEVICE TO ALERT YOU IN THE EVENT
THAT A GAS LEAK SHOULD DEVELOP.
FAILURE TO DETECT A PROPANE GAS LEAK COULD
RESULT IN AN EXPLOSION OR FIRE WHICH COULD
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
All propane gas equipment must conform to the safety standards of the National Board of Fire Underwriters (See NBFU
Manual 58) or Natural Standards of Canada B149.2, Installation Code for Propane Gas Burning Appliances and
Equipment.
For satisfactory operation, propane gas pressure must be
10 inch W.C. at the furnace manifold with all gas appliances
in operation. Maintaining proper gas pressure depends on
three main factors.
1. Vaporization rate, which depends on (a) temperature of
the liquid, and (b) "wetted surface" area of the container
or containers.
Figure 1
CHECKING THE GAS PIPING
CAUTION
TO AVOID THE POSSIBILITY OF PROPERTY DAMAGE,
PERSONAL INJURY OR FIRE, THE FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING
GAS CONNECTIONS AND PRESSURE TESTING.
14
2. Proper pressure regulation. (Two-stage regulation is
recommended from the standpoint of both cost and efficiency.)
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size
required will depend on length of pipe run and total load
of all appliances.
Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
PRODUCT DESIGN
Propane is an excellent solvent, and special pipe dope must
be used when assembling piping for this gas as it will quickly
dissolve white lead or most standard commercial compounds. Shellac base compounds resistant to the actions
of liquefied petroleum gases such as Gasolac, Stalactic,
Clyde's or John Crane are satisfactory.
Refer to Figure 2 for typical propane gas installations.
TYPICAL PROPANE PIPING
5 to 15 PSIG
(20 PSIG Max.)
First Stage
Regulator
200 PSIG
Maximum
Continuous
11" W.C.
Second Stage
Regulator
PROPANE GAS PIPING CHARTS
Sizing Between First and Second Stage Regulator
Maximum Propane Capacities listed are based on 2 PSIG Pressure
Drop at 10 PSIG Setting. Capacities in 1000 BTU/HR
PIPE OR
TUBING
NOMINAL PIPE
SIZE, SCH 40
TUBING SIZE, O.D., TYPE L
LENGTH,
FEET
3/8"
730
500
400
370
330
300
260
220
200
190
170
160
10
20
30
40
50
60
80
100
125
150
175
200
1/2"
1700
1100
920
850
770
700
610
540
490
430
400
380
5/8"
3200
2200
2000
1700
1500
1300
1200
1000
900
830
780
730
3/4"
5300
3700
2900
2700
2400
2200
1900
1700
1400
1300
1200
1100
7/8"
8300
5800
4700
4100
3700
3300
2900
2600
2300
2100
1900
1800
1/2"
3200
2200
1800
1600
1500
1300
1200
1000
900
830
770
720
3/4"
7500
4200
4000
3700
3400
3100
2600
2300
2100
1900
1700
1500
To Convert to Capacities at 15 PSIG Settings -- Multiply by 1.130
To Convert to Capacities at 5 PSIG Settings -- Multiply by 0.879
Figure 2
Sizing Between Single or Second Stage Regulator and Appliance
Maximum Propane Capacities listed are based on 1/2" W.C. Pressure
WARNING
IF YOUR PROPANE GAS FURNACE IS INSTALLED IN
A BASEMENT, AN EXCAVATED AREA OR A CONFINED
SPACE, WE STRONGLY RECOMMEND THAT YOU CONTACT YOUR PROPANE SUPPLIER ABOUT INSTALLING A WARNING DEVICE THAT WOULD ALERT YOU
TO A GAS LEAK.
Drop at 11" W.C. Setting. Capacities in 1000 BTU/HR
PIPE OR
TUBING
TUBING SIZE, O.D., TYPE L
NOMINAL PIPE SIZE, SCH 40
LENGTH
FEET
3/8" 1/2" 5/8" 3/4" 7/8" 1 7/8" 1/2" 3/4"
1" 1 1/4" 1 1/2"
10
39
92
199
329
501
935
275
567 1071 2205 3307
20
26
62
131
216
346
630
189
393
732
1496 2299
30
21
50
107
181
277
500
152
315
590
1212 1858
40
19
41
90
145
233
427
129
267
504
1039 1559
...... Propane gas is heavier than air and any leaking
gas can settle in any low areas or confined spaces.
50
18
37
79
131
198
376
114
237
448
913
60
16
35
72
121
187
340
103
217
409
834
1275
80
13
29
62
104
155
289
89
185
346
724
1086
...... Propane gas odorant may fade, making the gas
undetectable except with a warning device.
100
11
26
55
90
138
255
78
162
307
630
976
125
10
24
48
81
122
224
69
146
275
567
866
150
9
21
43
72
109
202
63
132
252
511
787
200
250
8
8
19
17
39
36
66
60
100
93
187
172
54
48
112
100
209
185
439
390
665
590
An undetected gas leak would create a danger of explosion or fire. If you suspect the presence of gas, follow the instructions on Page 8. Failure to do so could
result in SERIOUS PERSONAL INJURY OR DEATH.
1417
*DATA IN ACCORDANCE WITH NFPA PAMPHLET NO. 54
PROPANE TANK SIZING (MINIMUM)
TANK SIZE REQUIRED IF LOWEST OUTDOOR
MAXIMUM GAS
NEEDED TO
VAPORIZE*
125K BTU/HR
(50 CFH)
TEMPERATURE (AVG. FOR 24 HOURS) REACHES
32°F
115
GAL
20°F
115
GAL
10°F
115
GAL
0°F
250
GAL
-10°F
250
GAL
-20°F
400
GAL
-30°F
600
GAL
250K BTU/HR
(100 CFH)
250
GAL
250
GAL
250
GAL
400
GAL
500
GAL
1000
GAL
1500
GAL
375K BTU/HR
(150 CFH)
300
GAL
400
GAL
500
GAL
500
GAL
1000
GAL
1500
GAL
2500
GAL
500K BTU/HR
(200 CFH)
400
GAL
500
GAL
750
GAL
1000
GAL
1500
GAL
2000
GAL
3500
GAL
750K BTU/HR
(300 CFH)
750
GAL
1000
GAL
1500
GAL
2000
GAL
2500
GAL
4000
GAL
5000
GAL
* AVERAGE RATE/HOUR WITHDRAWL IN 8 HOUR PERIOD
15
SYSTEM OPERATION
COOLING
HEATING - Heat Pump Models
The refrigerant used in the system is R-22. It is clear, colorless, non-toxic, non-irritating, and non-explosive liquid.
The chemical formula is CHCLF2. The boiling point, at atmospheric pressure is -41.4°F.
The heating portion of the refrigeration cycle is similar to
the cooling cycle. The reversing valve reverses the flow of
the refrigerant. The indoor coil now becomes the condenser
coil and the outdoor coil becomes the evaporator coil. The
reversing valve is energized in the cooling mode not in the
heating mode as some previous models were.
A few of the important principles that make the refrigeration cycle possible are: heat always flows from a warmer to
a cooler body, under lower pressure a refrigerant will absorb heat and vaporize at a low temperature, the vapors
may be drawn off and condensed at a higher pressure and
temperature to be used again.
The indoor evaporator coil functions to cool and dehumidify
the air conditioned spaces through the evaporative process
taking place within the coil tubes.
NOTE: The pressures and temperatures shown are for
demonstration purposes only. Actual temperatures and
pressures are to be obtained from the "Cooling Performance
Chart."
High temperature, high pressure vapor leaves the compressor through the discharge line, through the reversing valve
on heat pump models, and enters the condenser coil. Air
drawn through the condenser coil by the condenser fan
causes the refrigerant to condense into a liquid by removing heat from the refrigerant. As the refrigerant is cooled
below its condensing temperature it becomes subcooled.
The restrictor orifice or check valve at the indoor coil will
open by the flow of refrigerant letting the now condensed
liquid refrigerant bypass the indoor expansion device. The
orifice or check valve at the outdoor coil will be forced closed
by the refrigerant flow, thereby utilizing the outdoor expansion device.
COOLING CYCLE
All Models
When the contacts of the room thermostat close making
terminals R to Y & to G, on the control board. Heat pumps
thermostat make the R to O terminals also.
The control board recognizes this as a demand for cooling
and energizes the compressor contactor, indoor blower motor. The blower delay is an integral part of the control board.
When the thermostat is satisfied, it opens its contacts, breaking the low voltage circuit, causing the compressor contactor
to open and indoor fan to stop after a 30 second delay.
The subcooled high pressure liquid refrigerant now leaves
the condenser coil via the liquid line until it reaches the
indoor expansion device. (Heat pump models will also have
an outdoor expansion valve/check valve assembly or a
restrictor orifice installed in the liquid line).
If the room thermostat fan selector switch should be set to
the "on" position then the indoor blower would run continuous rather than cycling with the compressor.
As the refrigerant passes through the expansion device and
into the evaporator coil a pressure drop is experienced causing the refrigerant to become a low pressure vapor. Low
pressure saturated refrigerant enters the evaporator coil
where heat is absorbed from the warm air drawn across
the coil by the evaporator blower. As the refrigerant passes
through the last tubes of the evaporator coil it becomes
superheated, that is, it absorbs more heat than is necessary for the refrigerant to vaporize. Maintaining proper superheat assures that liquid refrigerant is not returning to
the compressor which can lead to early compressor failure.
Package Heat Pumps
When the thermostat calls for heat, making terminals R to
Y, the low voltage circuit of the transformer is completed.
The control board applies power to the contactor starting
the compressor and outdoor fan motor. This also energizes the indoor blower relay (control board) through the
room thermostat, starting the indoor blower motor.
Low pressure superheated vapor leaves the evaporator coil
and returns through the suction line to the compressor where
the cycle begins again. On heat pump models the refrigerant must travel through the reversing valve and accumulator before returning to the compressor.
HEATING CYCLE
When auxiliary electric heaters are used, a two stage heating single stage cooling thermostat would be installed.
Should the second stage heating contacts in the room thermostat close, which would be wired to W at the unit control
board, this would energize the coil of the electric heat
relay(s). Contacts within the relay(s) will close, bringing on
the resistance heaters.
If electric heaters should be used, they may be controlled
by outdoor thermostats. (ATK01)
NOTE: Refer to the specifications section for the maximum heaters that may be installed for a specific unit.
16
SYSTEM OPERATION
Typical Package Cooling or Package Gas
Indoor
Coil
Outdoor
Coil
Thermostatic
Expansion
Valve
Either a thermostatic expansion valve or restrictor orifice
assy may be used depending on model, refer to the parts
catalog for the model being serviced.
Expansion Valve/Check Valve Assy in Cooling Operation
Chatleff
Orifice
Assy
Expansion Valve/Check Valve Assy in Heating Operation
Most expansion valves used in current Amana Heat Pump products use an internally checked expansion valve. This type
of expansion valve does not require an external check valve as shown above.
Restrictor Orifice Assy in Cooling Operation
Restrictor Orifice Assy in Heating Operation
In the cooling mode the orifice is pushed into its seat forcing refrigerant to flow through the metered hole in the center of the orifice.
In the heating mode the orifice moves back off its seat allowing refrigerant to flow unmetered around the outside of
the orifice.
17
SYSTEM OPERATION
Typical Heat Pump System in Cooling
Reversing Valve
(Energized)
Indoor
Coil
Outdoor
Coil
Accumulator
Expanision device may not be as
shown. Refer to product parts manual
for actual part description.
Thermostatic
Expansion
Valve
Check Valve
Typical Heat Pump System in Heating
Reversing Valve
(De-Energized)
Indoor
Coil
Outdoor
Coil
Accumulator
Expanision device may not be as
shown. Refer to product parts manual
for actual part description.
Thermostatic
Expansion
Valve
Check Valve
18
SYSTEM OPERATION
DEFROST CYCLE
Package Heat Pumps
The defrosting of the outdoor coil is jointly controlled by the
defrost control board, defrost (30/60) control and compressor run time.
Solid State Timer
The defrost timer board can be connected for one of three
(3) time intervals. 30 minutes, 60 minutes, and 90 minutes
(Factory connected @ 60 min.). Package heat pumps manufactured after May 1999 (9905 Serial date code) will be
factory set @ 30 min.
The timing interval can not begin until the outdoor coil temperature reaches approximately 30°F. (initiation temperature) at the defrost (30/60) control point of contact. As long
as this point of contact does not reach 60°F. (termination
temperature) the defrost timer board will count the number
of minutes that the compressor runs.
At the end of this (one of three) time interval, the defrost
board will call for defrost and enter the defrost mode. In this
mode the control board will energize the reversing relay,
de-energize the outdoor fan motor and energize the supplemental electric heat relay (if installed). When this occurs,
the outdoor fan motor stops and the reversing valve changes
to the cooling position sending hot refrigerant gas to the
outdoor coil, which will melt any frost accumulation.
The defrost control board will stay in the defrost mode until
the outdoor coil temperature reaches approximately 60°F.
at the point of contact with the defrost (30/60) control or a
maximum of 10 minutes compressor run time.
If the defrost cycle is terminated by temperature, then a
new time interval count can not begin until the defrost (30/
60) control again reaches approximately 30°F. at the point
of contact. If the defrost cycle was terminated by time, then
a new time interval could would begin immediately.
Blower operation is controlled by the ignition control module. The module provides for field adjustment of the blower
delay at the end of the heating cycle. The range of adjustment is for 60, 90, 120, or 180 seconds. The factory delay
setting is 30 seconds delay on 120 seconds delay off.
Honeywell Smart Valve Systems
Ignition is provided by an electronic ignition control and ceramic glow bar or direct spark ignitor which heats to approximately 2500°F. A flame sensor then monitors for the
presence of flame and closes the gas valve if flame is lost.
The system may be controlled by most good heating and
cooling thermostats with an adjustable heat anticipator.
Some night setback thermostats that do not have a common terminal, use a power robbing circuit in the off cycle to
maintain the batteries. This type of thermostat may interfere with the operation of the ignition control and should
not be used.
Direct Spark Ignition (DSI) Systems
Amana PGA__C, PGB__C and PGD__C units built after
July, 1999, are equipped with a direct spark ignition system. Ignition is provided by 20,000 volt electronic spark. A
flame sensor then monitors for the presence of flame and
closes the gas valve if flame is lost.
The system may be controlled by most good heating and
cooling thermostats with an adjustable heat anticipator.
Some night setback thermostats that do not have a common terminal, use a power robbing circuit in the off cycle to
maintain the batteries. This type of thermostat may interfere with the operation of the ignition control module and
should not be used.
HEATING SEQUENCE (Smart Valve and DSI Systems)
In order to illustrate the heating sequence, the following
has been simplified to give a better understanding of the
pressure switch operation.
HEATING CYCLE
Package Gas Units
The heating cycle is accomplished by using a unique tubular design heat exchanger which provides efficient gas heating on either natural gas or propane gas fuels. The heat
exchangers compact tubular construction provides excellent heat transfer for maximum operating efficiency.
Inshot type gas burners with integral cross lighters are used
eliminating the need for adjustable air shutters. The same
burner is designed for use on either natural or propane gas
fuels.
The Induced Draft blower draws fuel and combustion air
into the burners and heat exchanger for proper combustion. A pressure switch is used in conjunction with the I. D.
blower to detect a blocked flue condition.
Pressure Tap
Figure 8
Figure 8 is a view of the induced draft blower showing the
location of the pressure tap. The induced draft blower is
mounted on the the collector box, the Heat Exchanger terminates into the collector box.
19
SYSTEM OPERATION
The pressure tap has a predetermined orifice size for reading static pressures. The induced draft blower motor assembly is mounted to the collector box. When the motor is
in operation, a negative pressure will be created on the
pressure tap, collector box and heat exchanger flue passages.
A pressure control using a single pole, single throw electrical switch is used as a safety device in case of a blocked
flue.
OFF
ON
The figure 9 illustrates the pressure control in an off position.
NEGATIVE PRESSURE
CONNECTOR
NORMALLY OPEN
TERMINAL
Figure 10
7. Wait five minutes to clear out any gas.
8. Smell for gas, including near the ground. This is important because some types of gas are heavier than air. If
you have waited five minutes and you do smell gas,
immediately follow the instructions on the Page 8 of
this manual. If having waited for five minutes and no
gas is smell is noted, turn the gas control valve knob to
the ON position.
COMMON
TERMINAL
Figure 9
With the furnace in the off position the induced draft blower
motor will not be running. Atmospheric pressure will therefore be on both sides of the diaphragm and the electrical
switch will be open between (C) common and (NO) normally open terminals.
When the induced draft blower motor is in operation, the Jtube hose will create a negative pressure on one side of
the diaphragm and atmospheric pressure will be on the other
side causing the diaphragm to move toward the negative
pressure.
This in turn will close the switch and make the (C) common
to the (NO) normally open terminals.
In the event of partially restricted or blocked flue the induced draft blower will create less negative pressure and
at approximately -0.32" +.06 W.C. negative pressure would
open the contacts (C) to (NO).
OPERATING INSTRUCTIONS
1. Close the manual gas valve external to the unit.
2. Turn off the electrical power supply to the unit.
3. Set the room thermostat to its lowest possible setting.
4. Remove the heat exchanger door on the side of the
unit by removing screws.
5. This unit is equipped with an ignition device which automatically lights the pilot. DO NOT try to light burner by
any other method.
6. Turn the gas control valve knob to the OFF position. Do
not force. Some Gas valves may have a different off/on
style switch.
20
9. Replace the heat exchanger door on the side of the
unit.
10. Open the manual gas valve external to the unit.
11. Turn on the electrical power supply to the unit.
12. Set the thermostat to desired setting.
NOTE: There is approximate 20 second delay between
thermostat energizing and burner firing.
FAN OPERATION
Continuous Fan Mode
If the thermostat calls for continuous fan without a call for
heat or cool, the indoor blower will be energized at the heat
speed after a 7 second on delay. The fan remains energized as long as there is not a call for heat or cool. Once
the call for continuous fan is de-energized, the indoor blower
will go through a 30 second off delay.
If a call for cool occurs during continuous fan operation, the
blower will switch to the cooling speed after the 7 second
cool on delay.
If a call for heat occurs during continuous fan operation,
the indoor blower will de-energize when the heat on blower
delay begins. The heat cycle will control the indoor blower
operation until the heat blower off delay is over. The continuous fan mode will function normally even while the control is in heat lockout.
SYSTEM OPERATION
ELECTRIC HEATERS
Optional electric heaters may be added, in the quantities
shown in the specifications section to provide electric resistance heating. Under no condition shall more heaters
than the quantity shown be installed.
The low voltage circuit in the blower section is factory wired
and terminates at the location provided for the electric
heater(s). A minimum of field wiring is required to complete
the installation.
Other components such as a Heating/Cooling Thermostat,
Outdoor Thermostat, and Compressor sound blankets are
available to complete the installation.
The system CFM can be determined by measuring the static
pressure external to the unit. The installation manual supplied with the unit shows the CFM for the static measured.
Alternately, the system CFM can be determined by operating the electric heaters and indoor blower WITHOUT having the compressor in operation. Measure the temperature
rise as close to the blower inlet and outlet as possible.
If other than a 240V power supply is used, refer to the BTUH
CAPACITY CORRECTION FACTOR chart below.
EXAMPLE: Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our measured temperature rise is 42°F. Find the actual CFM:
TEMPERATURE RISE (F ) @ 240V
C FM
4.8
K.W.
7.2
K.W.
9.6
K.W.
14.4
K.W.
19.2
K.W.
24.0
K.W.
28.8
K.W.
600
25
38
51
-
-
-
-
700
22
33
43
-
-
-
-
800
19
29
38
57
-
-
-
900
17
26
34
51
-
-
-
1000
15
23
30
46
-
-
-
1100
14
21
27
41
55
-
-
1200
13
19
25
38
50
-
-
1300
12
18
23
35
46
-
-
1400
11
16
22
32
43
54
65
1500
10
15
20
30
40
50
60
1600
9
14
19
28
38
47
57
1700
9
14
18
27
36
44
53
1800
8
13
17
25
34
42
50
1900
8
12
16
24
32
40
48
2000
8
12
15
23
30
38
45
2100
7
11
14
22
29
36
43
2200
7
11
14
21
27
34
41
2300
7
10
13
20
26
33
39
Answer: 24.0 KW, 42°F Rise, 240 V = 1800 CFM from the
TEMPERATURE RISE chart below.
Heating output at 220 V = 24.0 x 3.413 x .84 - 68.8 MBh.
Actual CFM = 1800 x .84 = 1400 CFM.
NOTE: The temperature rise table is for sea level installations. The temperature rise at a particular KW and CFM will
be greater at high altitudes, while the external static pressure at a particular CFM will be less.
BTUH CAPACITY CORRECTION FACTOR
SUPPLY VOLTAGE
480 460 440 250 230 220 208
MULTIPLICATION FACTOR 1.09 1.00 .91 1.08 .92 .84 .75
FORMULAS:
Heating Output = KW x 3413 x Corr. Factor
Actual CFM = CFM (from table) x Corr. Factor
BTUH = KW x 3413
Heater Kit
BTUH = CFM x 1.08 x Temperature Rise (∆T)
CFM = KW x 3413
1.08 x ∆T
∆T = BTUH
CFM x 1.08
PHCB05C1
PHCB10C1
PHCB15C1
PHCB20C1
Heater Capacity @ 240 VAC
Minimum
Maximum
kW BTUH
Circuit
Overcurrent
Ampacity
Protection
L1 - L2 L3 - L4 L1 - L2 L3 - L4
25
-30
-4.8 16,400
50
-60
-9.6 32,800
50
25
60
30
14.4 49,100
50
50
60
60
19.2 65,500
21
SCHEDULED MAINTENANCE
The owner should be made aware of the fact, that, as with
any mechanical equipment the remote air conditioner requires regularly scheduled maintenance to preserve high
performance standards, prolong the service life of the equipment, and lessen the chances of costly failure.
In many instances the owner may be able to perform some
of the maintenance; however, the advantage of a service
contract, which places all maintenance in the hands of a
trained serviceman, should be pointed out to the owner.
WARNING
DISCONNECT POWER SUPPLY BEFORE SERVICING
ONCE A MONTH
1. Inspect the return filters of the evaporator unit and clean
or change if necessary. NOTE: Depending on operation conditions, it may be necessary to clean the filters
more often. If permanent type filters are used, they
should be washed with warm water, dried and sprayed
with an adhesive according to manufacturers recommendations.
2. When operating on the cooling cycle, inspect the condensate line piping from the evaporator coil. Make sure
the piping is clear for proper condensate flow.
ONCE A YEAR
Qualified Service Personnel Only
1. Clean the indoor and outdoor coils.
2. Clean the casing of the outdoor unit inside and out .
3. Motors are permanently lubricated and do not require
oiling. TO AVOID PREMATURE MOTOR FAILURE, DO
NOT OIL.
4. Manually rotate the outdoor fan and indoor blower to
be sure they run freely.
5. Inspect the control panel wiring, compressor connections, and all other component wiring to be sure all connections are tight. Inspect wire insulation to be certain
that it is good.
6. Check the contacts of the compressor contactor. If they
are burned or pitted, replace the contactor.
7. Using a halide or electronic leak detector, check all piping and etc. for refrigerant leaks.
8. Check the combustion chamber (Heat Exchanger) for
soot, scale, etc. Inspect all burners for lint and proper
positioning.
9. Start the system, using the proper instrumentation check
gas inlet and manifold pressures, burner flame and
microamp signal. Adjust if necessary.
10. Start the system and run both a Cooling & Heating Performance Test. If the results of the test are not satisfactory, see the "Service Problem Analysis" Chart of
the possible cause.
22
TEST EQUIPMENT
Proper test equipment for accurate diagnosis is as essential as regular hand tools.
The following is a must for every service technician and
service shop:
1. Thermocouple type temperature meter - measure dry
bulb temperature.
2. Sling psychrometer- measure relative humidity and wet
bulb temperature.
3. Amprobe - measure amperage and voltage.
4. Refrigeration Test Cord - check compressors, motors,
and continuity testing.
5
Volt-Ohm Meter - testing continuity, capacitors, and
motor windings.
6. Accurate Leak Detector - testing for refrigerant leaks.
7. High Vacuum Pump - evacuation.
8. Electric Vacuum Gauge, Manifold Gauges and high
vacuum hoses - to measure and obtain proper vacuum.
9. Accurate Charging Cylinder or Electronic Scale - measure proper refrigerant charge.
10. Inclined Manometer - measure static pressure and pressure drop across coils.
Other recording type instruments can be essential in solving abnormal problems, however, in many instances they
may be rented from local sources.
Proper equipment promotes faster, more efficient service,
and accurate repairs with less call backs.
COOLING & HEATING PERFORMANCE TEST
Package Cooling and Package Heat Pumps
Before attempting to diagnose an operating fault, run a Cooling and/or Heating Performance Test and apply the results
to the Service Problem Analysis Guide.
Package Gas Units
Before attempting to diagnose an operating fault, run a heating performance test and apply the results to the Service
Problem Analysis Guide.
To conduct a heating performance test, the BTU input to
the furnace must be calculated.
After the heating cycle has been in operation for at least
fifteen minutes and with all other gas appliances turned off,
the gas meter should be clocked.
SERVICING
To find the BTU input, multiply the number of cubic feet of
gas consumed per hour by the heating value of the gas
being used. (The calorific value of the gas being used is
found by contacting your local utility.)
Example:
It is found by the gas meter, that it takes forty (40) seconds
for the hand on the cubic foot dial to make one complete
revolution, with all appliances off, except the furnace. Take
this information and locate it on the gas rate chart. Observe the forty (40) seconds, locate and read across to the
one (1) cubic foot dial column. There we find the number
90, which shows that ninety (90) cubic feet of gas will be
consumed in one (1) hour.
Let's assume the local gas utility has stated that the calorific value of the gas is 1025 BTU.
Multiplying the ninety (90) cubic feet by 1025 BTU gives us
an input of 92,250 BTUH.
Checking the BTU input on the rating plate of the furnace
being tested.
EXAMPLE:
PGB30C0902D
INPUT: 90,000 BTU/HR
OUTPUT CAP: 72,000
Should the figure you calculated not fall within five (5) percent of the nameplate rating of the unit, adjust the gas valve
pressure regulator or resize orifices. In no case should
the input exceed that shown on the rating plate.
To adjust the pressure regulator on the gas valve, turn down
(clockwise) to increase pressure and input, and out (counterclockwise) to decrease pressure and input.
Since normally propane gas is not installed with a gas meter,
clocking will be virtually impossible. The gas orifices used
with propane are calculated for 2500 BTU gas and with
proper inlet pressures and correct piping size, full capacity
will be obtained.
With propane gas, no unit gas valve regulator is used; however, the second stage supply line pressure regulator should
be adjusted to give 11" water column with all other gas consuming appliances running.
The dissipation of the heat transferred to the heat exchanger
is now controlled by the amount of air circulated over its
surface.
The amount (CFM) of air circulated is governed by the external static pressure in inches of water column of duct work,
cooling coil, registers and etc., applied externally to the unit
versus the motor speed tap.
A properly operating unit must have the BTU input and CFM
of air, within the limits shown to prevent short cycling of the
equipment. As the external static pressure goes up, the
temperature rise will also increase. Consult the proper
tables for temperature rise limitation.
CAUTION
ALWAYS CONNECT A MANOMETER TO THE 1/8" PIPE
TAP AT THE GAS VALVE BEFORE ADJUSTING THE
PRESSURE REGULATOR. IN NO CASE SHOULD THE
FINAL MANIFOLD PRESSURE VARY MORE THAN PLUS
OR MINUS .3 INCHES WATER COLUMN FROM 3.5
INCHES WATER COLUMN FOR NATURAL GAS OR 10
INCHES WATER COLUMN FOR PROPANE GAS.
23
SERVICING
1
0
9
2
8
3
7 7
4
6
5
1 Million
Quarter
1
1
9
8
2
9
9
2
3 3
6
5
4
100 Thousand
4
5
1
8
2
7 7
3
8
6
6
5
4
1 Thousand
10 Thousand
CUBIC
FEET
One
Foot
Foot
0
GAS RATE -- CUBIC FEET PER HOUR
24
Seconds
for One
Revolution
1/4
cu/ft
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
90
82
75
69
64
60
56
53
50
47
45
43
41
39
37
36
34
33
32
31
30
-28
-26
--
Size of Test Dial
1/2
1
2
cu/ft
cu/ft
cu/ft
5
cu/ft
Seconds
for One
Revolution
1/4
cu/ft
180
164
150
138
129
120
113
106
100
95
90
86
82
78
75
72
69
67
64
62
60
-56
-53
--
1800
1636
1500
1385
1286
1200
1125
1059
1000
947
900
857
818
783
750
720
692
667
643
621
600
581
563
545
529
514
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
25
-23
-22
-21
--20
-19
--18
--17
--16
---15
360
327
300
277
257
240
225
212
200
189
180
171
164
157
150
144
138
133
129
124
120
116
113
109
106
103
720
655
600
555
514
480
450
424
400
379
360
343
327
313
300
288
277
265
257
248
240
232
225
218
212
206
Size of Test Dial
1/2
1
2
cu/ft
cu/ft
cu/ft
50
-47
-45
-43
-41
40
-38
--36
--34
--32
-31
-30
100
97
95
92
90
-86
-82
80
78
76
75
-72
-69
-67
-64
-62
-60
200
195
189
185
180
176
172
167
164
160
157
153
150
147
144
141
138
136
133
131
129
126
124
122
120
5
cu/ft
500
486
474
462
450
439
429
419
409
400
391
383
375
367
360
355
346
340
333
327
321
316
310
305
300
SERVICING
COOLING OR HEAT PUMP - SERVICE ANALYSIS GUIDE
Power Failure
Blown Fuse
Loose Connection
Shorted or Broken W ires
O pen O verload
Faulty T hermostat
Faulty T ransformer
Shorted or O pen Capacitor
Shorted or G rounded Compressor
Compressor Stuck
Faulty Compressor Contactor
Faulty Fan Relay
O pen Control Circuit
Low Voltage
Faulty Evap. Fan Motor
Shorted or G rounded Fan Motor
Improper Cooling Anticipator
Shortage or Refrigerant
Restricted Liquid Line
Dirty Air Filter
Dirty Indoor Coil
Not enough air across Indoor Coil
T oo much air across Indoor Coil
O vercharge of Refrigerant
Dirty O utdoor Coil
Noncondensibles
Recirculation of Condensing Air
Infiltration of O utdoor Air
Improperly Located T hermostat
Air Flow Unbalanced
System Undersized
Broken Internal Parts
Inefficient Compressor
High Pressure Control O pen
Unbalanced Power, 3PH
W rong T ype Expansion Valve
Expansion Device Restricted
Expansion Valve Bulb Loose
Inoperative Expansion Valve
Loose Hold-down Bolts
Faulty Reversing Relay
Faulty Defrost Relay
Faulty Reversing Valve
Leaking Check Valve/O rifice
Faulty Defrost T imer
Faulty 30/60 Control
Additional O pt Elect. Heat Req.
O pen fuse or limit in Elect. Htr
O .D. T hermostat setting to Low
•
• •
• • •
• •
•
• •
•
•
• •
•
•
•
• •
•
•
•
• •
• •
•
•
•
• •
• •
•
•
•
•
•
•
•
•
• •
• •
• • •
• •
♦
• Clg or Htg Cycle
•
•
♦
♦
♦
♦
♦
•
•
•
• •
• •
•
•
•
• •
• •
• •
•
•
•
• •
•
• •
•
•
•
•
•
•
•
•
♦
•
• •
•
•
•
• •
♦
• •
•
•
♦
♦♦
♦♦♦
♦♦
♦
♦
♦
♦
• •
• •
Test Method
Remedy
T est Voltage
Imspect Fuse Size & T ype
Inspect Connection - T ighten
T est Circuits W ith O hmmeter
T est Continuity of O verload
T est continuity of T hermostat & W iring
Check control circuit with voltmeter
T est Capacitor
T est Motor W indings
Use T est Cord
T est continuity of Coil & Contacts
T est continuity of Coil And Contacts
T est Control Circuit with Voltmeter
T est Voltage
Repair or Replace
T est Motor W indings
Check resistance of Anticipator
T est For Leaks, Add Refrigerant
Replace Restricted Part
Inspect Filter-Clean or Replace
Inspect Coil - Clean
Speed Blower, Check Duct Static Press
Reduce Blower Speed
Release Part of Charge
Inspect Coil - Clean
Remove Charge, Evacuate, Recharge
Remove O bstruction to Air Flow
Check W indows, Doors, Vent Fans, Etc.
Relocate T hermostat
Readjust Air Volume Dampers
Refigure Cooling Load
Replace Compressor
T est Compressor Efficiency
Reset And T est Control
T est Voltage
Replace Valve
Replace Valve
T ighten Bulb Bracket
Check Valve O peration
T ighten Bolts
T est continuity of Coil And Contacts
T est continuity of Coil And Contacts
T est Valve O peration
Replace Check Valve
T est T imer O peration
T est Control
Run Load Calculation, Add Heaters
Inspect Fuses and Limits
Raise Setting
See Service Procedure Ref.
High head pressure
High suction pressure
Low head pressure
System
Operating
Pressures
Low suction pressure
Unit will not defrost
Unit will not terminate defrost
System run blows cold air (Heating)
Compressor is noisy
Certain areas to cool others to warm
Not cool enough on warm days
Too cool and then too warm
Unsatisfactory Clg / Htg
System runs continuously - little clg / htg
Compressor cycles on overload
Compressor runs - goes off on overload
Condenser fan will not start
•
• •
•
• • •
•
•
• •
•
•
•
• •
Evaporator fan will not start
SYMPTOM
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
System will not start
POSSIBLE CAUSE
Comp. and Cond. Fan will not start
No Cooling / Heating
Compressor will not start - fan runs
Complaint
S-1
S-4
S-2
S-3
S-17A
S-3
S-4
S-15
S-17B
S-17C
S-7, S-8
S-7
S-4
S-1
S-16
S-16
S-3
S-103
S-112
S-200
S-200
S-113
S-114
S-104
S-12
S-110
S-7
S-7
S-21
S-23/24
S-25
S-50
Heat Pump Cycle only
25
SERVICING
GAS HEATING - SERVICE ANALYSIS GUIDE
Power Failure
Blown Fuse
Loose Connection
Shorted or Broken Wires
No Low Voltage
Faulty Thermostat
Faulty Transformer
Poor or High Resistance Ground
Faulty Limit or Roll Out Switch
Faulty Flame Sensor
Faulty Ignition Control
Gas Valve or Gas Supply Shut Off
Faulty Induced Draft Blower
Broken or Shorted Ignitor
Faulty Combustion Relay
Dirty Flame Sensor, Low uA
Flame Sensor not in Flame, Low uA
Faulty Gas Valve
Open Auxillary Limit
Improper Air Flow or Distribution
Cycling on Limit
Delayed Ignition
Orifice Size
Cracked Heat Exchanger
Stuck Gas Valve
Furnace Undersized
Faulty Pressure Switch
Blocked or Restricted Flue
Open Roll Out Switch
Collector Box "J" Tube Position
Bouncing On Pressure Switch
26
•
•
•
• •
• •
•
• •
•
•
•
•
•
•
•
•
•
•
•
• •
•
•
• • •
• •
• •
•
•
•
•
•
•
•
•
•
• • •
• • •
•
• •
•
•
S-1
Test Voltage
S-4
Check Wiring
S-2
Check Wiring
S-3
Check Transformer
S-4
Check Thermostat
S-3
Check Transformer
• •
• •
See Service Procedure Reference
Not Enough Heat
To Much Heat
Soot and /or Fumes
Long Cycles
• •
Flashback
Gas Pressure
Test Method
Remedy
Test Voltage
Improper Heat Anticipator Setting
Improper Thermostat Location
Burner Ignites-Locks Out
•
•
•
•
•
•
•
Burner Won't Ignite
SYMPTOM
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
System Will Not Start
POSSIBLE CAUSE
Unsatisfactory Heat
Short Cycles
No Heat
Burner Shuts Off prior to T'Stat being Satasfied
Complaint
Measure Ground Resistance
Adjust Heat Anticipator Setting
S-4
S-313
S-3
Relocate Thermostat
Test Control
S-300-302
Test Flame Sensor
S-314
Test Control
S-313
Turn Valves to On Position
S-304
Test Blower
S-309
Test Ignitor
S-312
Test Relay
S-20
Clean Flame Sensor
S-314
Test/Adjust Position of Flame Sensor
S-314
Replace Gas Valve
S-304
Reset Control
S-301
Check Duct Static
Check Controls & Temperature Rise
S-300
Test for Delayed Ignition
S-308
Test for Flashback
S-309
Check Orifices
S-306
Check Gas Pressure
S-307
Check Burner Flames
S-302
Replace Gas Valve
S-304
Replace with Proper Size Furnce
Test Pressure Switch
S-310
Check Flue/Drawdown Pressure
S-310
Test Control
S-302
Test Negative Pressure
S-310
Test Negative Pressure
S-310
SERVICING
Three phase units require a balanced 3 phase power supply to operate. If the percentage of voltage imbalance exceeds 3% the unit must not be operated until the voltage
condition is corrected.
S-1 CHECKING VOLTAGE
WARNING
Disconnect Electrical Power Supply:
Max. Voltage Deviation
From Average Voltage X 100
Average Voltage
1. Remove doors, control panel cover, etc. from unit being tested.
% Voltage =
Imbalance
With power ON:
To find the percentage of imbalance, measure the incoming power supply.
WARNING
L1 - L2 = 240V
LINE VOLTAGE NOW PRESENT
2. Using a voltmeter, measure the voltage across terminals L1 and L2 of the contactor for single phase units,
and L3, for 3 phase units.
L1 - L3 = 232V
Avg. V = 710 = 236.7
L2 - L3 = 238V
3
Total
710V
To find Max. deviation:
240 - 236.7 = +3.3
3. No reading - indicates open wiring, open fuse(s) no
power or etc. from unit to fused disconnect service.
Repair as needed.
4. With ample voltage at line voltage connectors, energize the unit.
5. Measure the voltage with the unit starting and operating, and determine the unit Locked Rotor Voltage.
NOTE: If checking heaters, be sure all heating elements are energized.
Locked Rotor Voltage is the actual voltage available
at the compressor during starting, locked rotor, or a
stalled condition. Measured voltage should be above
minimum listed in chart below.
232 - 236.7 = -4.7
238 - 236.7 = +1.3
Max deviation was 4.7V
% Voltage Imbalance = 4.7
236.7
If the percentage of imbalance had exceeded 3%, it must
be determined if the imbalance is in the incoming power
supply or the equipment. To do this rotate the legs of the
incoming power and retest voltage as shown below.
L1 - L2 = 240V
L1 - L3 = 227V
L2 - L3 = 238V
To measure Locked Rotor Voltage attach a voltmeter
to the run "R" and common "C" terminals of the compressor, or to the T1 and T2 terminals of the contactor.
Start the unit and allow the compressor to run for several seconds, then shut down the unit. Immediately
attempt to restart the unit while measuring the Locked
Rotor Voltage.
6. Should read within the voltage tabulation as shown. If
the voltage falls below the minimum voltage, check the
line wire size. Long runs of undersized wire can cause
low voltage. If wire size is adequate, notify the local
power company in regards to either low or high voltage.
= 1.99%
Rotate all 3 incoming
legs as shown.
L1
L2
L3
L1 - L2 = 227V
L1 - L3 = 238V
L2 - L3 = 240V
UNIT SUPPLY VOLTAGE
VOLTAGE
MIN.
MAX.
460
437
506
208/230
198
253
NOTE: When operating electric heaters on voltages other
than 240 volts refer to the System Operation section on
electric heaters to calculate temperature rise and air flow.
Low voltage may cause insufficient heating.
L1
L2
L3
By the voltage readings we see that the imbalance rotated
or traveled with the switching of the incoming legs. Therefore the power lies within the incoming power supply.
If the imbalance had not changed then the problem would
lie within the equipment. Check for current leakage, shorted
motors, etc.
27
SERVICING
S-2 CHECKING WIRING
WARNING
Disconnect Electrical Power Supply:
1. Check wiring visually for signs of overheating, damaged
insulation and loose connections.
2. Use an ohmmeter to check continuity of any suspected
open wires.
3. If any wires must be replaced, replace with comparable
gauge and insulation thickness.
S-3 CHECKING THERMOSTAT, WIRING, AND
ANTICIPATOR
S-3A Thermostat and Wiring
WARNING
LINE VOLTAGE NOW PRESENT
With power ON and thermostat calling for cooling.
1. Use a voltmeter to check for 24 volts at thermostat wires
C and Y in the condensing unit control panel.
2. No voltage indicates trouble in the thermostat, wiring or
external transformer source.
3. Check the continuity of the thermostat and wiring. Repair or replace as necessary.
S-3B Cooling Anticipator
The cooling anticipator is a small heater (resistor) in the
thermostat. During the "off" cycle it heats the bimetal element helping the thermostat call for the next cooling cycle.
This prevents the room temperature from rising too high
before the system is restarted. A properly sized anticipator
should maintain room temperature within 1 1/2 to 2 degree
range.
The anticipator is supplied in the thermostat and is not to
be replaced. If the anticipator should fail for any reason,
the thermostat must be changed.
S-3C Heating Anticipator
The heating anticipator is a wire-wound adjustable heater,
which is energized during the "ON" cycle to help prevent
overheating of the conditioned space.
The anticipator is a part of the thermostat and if it should
fail for any reason, the thermostat must be replaced. See
the following for recommended heater anticipator setting.
The first stage heat anticipator setting for heat pump models is .40. The heat anticipator setting for the package gas
models is .80.
S-4 CHECKING TRANSFORMER AND CONTROL
CIRCUIT
A step-down transformer (208/240 volt primary to 24 volt
secondary) is provided with each package unit. This allows ample capacity for use with resistance heaters.
Indoor Blower Motor
With power ON:
WARNING
WARNING
Disconnect Electrical Power Supply:
LINE VOLTAGE NOW PRESENT
1. Remove control panel cover or etc. to gain access to
transformer.
1. Set fan selector switch at thermostat to "ON" position.
With power ON:
2. With voltmeter, check for 24 volts at wires C and G.
WARNING
3. No voltage, indicates the trouble is in the thermostat or
wiring.
LINE VOLTAGE NOW PRESENT
4. Check the continuity of the thermostat and wiring. Repair or replace as necessary.
2. Using a voltmeter, check voltage across secondary voltage side of transformer (R to C).
Resistance Heaters
1. Set room thermostat to a higher setting than room temp
so both stages call for heat.
2. With voltmeter, check for 24 volts at each heater relay.
3. No voltage, indicates the trouble is in the thermostat or
wiring.
4. Check the continuity of the thermostat and wiring. Repair or replace as necessary.
NOTE: Consideration must be given as to how the heaters
are wired (O.D.T. and etc.). Also safety devices must be
checked for continuity.
28
3. No voltage indicates faulty transformer, bad wiring, or
bad splices.
4. Check transformer primary voltage at incoming line voltage connections and/or splices.
5
If line voltage available at primary voltage side of transformer and wiring and splices good, transformer is inoperative. Replace.
S-6 CHECKING TIME DELAY RELAY
Time delay relays are used in Amana Package Units to
improve efficiency by delaying the blower off time. This feature is incorporated into the electronic controls. See S-23
to check control board.
SERVICING
S-7 CHECKING CONTACTOR AND/OR RELAYS
S-15 CHECKING CAPACITOR
The compressor contactor and other relay holding coils are
wired into the low or line voltage circuits. When the control
circuit is energized the coil pulls in the normally open contacts or opens the normally closed contacts. When the coil
is de-energized, springs return the contacts to their normal
position.
1. Remove the leads from the holding coil.
CAPACITOR, RUN
A run capacitor is wired across the auxiliary and main windings of a single phase permanent split capacitor motor. The
capacitors primary function is to reduce the line current while
greatly improving the torque characteristics of a motor. This
is accomplished by using the 90° phase relationship between the capacitor current and voltage in conjunction with
the motor windings so that the motor will give two phase
operation when connected to a single phase circuit. The
capacitor also reduces the line current to the motor by improving the power factor.
2. Using an ohmmeter, test across the coil terminals.
CAPACITOR, START
If the coil does not test continuous, replace the relay or
contactor.
SCROLL COMPRESSOR MODELS
Hard start components are not required on Scroll compressor equipped units due to a non-replaceable check valve
located in the discharge line of the compressor. However
hard start kits are available and may improve low voltage
starting characteristics.
WARNING
Disconnect Electrical Power Supply:
S-8 CHECKING CONTACTOR CONTACTS
WARNING
Disconnect Electrical Power Supply:
1. Disconnect the wire leads from the terminal (T) side of
the contactor.
2. With power ON, energize the contactor.
This check valve closes off high side pressure to the compressor after shut down allowing equalization through the
scroll flanks. Equalization requires only about one or two
seconds during which time the compressor may turn backwards.
To prevent the compressor from starting and running backwards a Time Delay Relay (Cycle Protector) has been added
to the low voltage circuit.
WARNING
LINE VOLTAGE NOW PRESENT
T2
T1
CC
VOLT/OHM
METER
L2
L1
Ohmmeter for testing holding coil
Voltmeter for testing contacts
TESTING COMPRESSOR CONTACTOR
3. Using a voltmeter, test across terminals.
A. L2 - T1 - No voltage indicates CC1 contacts open.
If a no voltage reading is obtained - replace the contactor.
S-9 CHECKING FAN RELAY CONTACTS
The fan relays are incorporated into the control board. See
sections S-23 for checking control board.
NOTE: K3 series scroll compressors have an anti-rotation device and equalizing mechanism incorporated into the
compressor and will equalize in 0.2 to 0.3 seconds. These
compressors will operate correctly without a Time Delay
Relay.
MODELS EQUIPPED WITH A HARD START DEVICE
A start capacitor is wired in parallel with the run capacitor
to increase the starting torque. The start capacitor is of the
electrolytic type, rather than metallized polypropylene as
used in the run capacitor.
A switching device must be wired in series with the capacitor to remove it from the electrical circuit after the compressor starts to run. Not removing the start capacitor will overheat the capacitor and burn out the compressor windings.
These capacitors have a 15,000 ohm, 2 watt resistor wired
across its terminals. The object of the resistor is to discharge the capacitor under certain operating conditions,
rather than having it discharge across the closing of the
contacts within the switching device such as the Start Relay, and to reduce the chance of shock to the servicer. See
the Servicing Section for specific information concerning
capacitors.
NOTE: Some variation over time has occurred in the fan
relays used. Refer to the unit wiring diagram for terminal
identification.
29
SERVICING
RELAY, START
A potential or voltage type relay is used to take the start
capacitor out of the circuit once the motor comes up to
speed. This type of relay is position sensitive. The normally closed contacts are wired in series with the start capacitor and the relay holding coil is wired parallel with the
start winding. As the motor starts and comes up to speed,
the increase in voltage across the start winding will energize the start relay holding coil and open the contacts to
the start capacitor.
Two quick ways to test a capacitor are a resistance and a
capacitance check.
WARNING
DISCHARGE CAPACITOR THROUGH A 20 TO 30 OHM
RESISTOR BEFORE HANDLING.
Capacitance (MFD) = 2650 X Amperage
Voltage
Volt / Ohm
Meter
S-15A Resistance Check
15 AMP FUSE
C
ap
a
AMMETER
Disconnect Electrical Power Supply:
ci
to
r
WARNING
1. Discharge capacitor and remove wire leads.
TESTING CAPACITANCE
WARNING
DISCHARGE CAPACITOR THROUGH A 20 TO 30 OHM
RESISTER BEFORE HANDLING.
Volt / Ohm
Meter
S-16 CHECKING FAN AND BLOWER MOTOR
An auto reset fan motor overload is designed to protect the
motor against high temperature and high amperage conditions similar to the compressor internal overload. It also
breaks the common circuit within the motor shell; however,
heat generated within the motor is faster to dissipate than
the compressor, allow at least 45 minutes for the overload
to reset, then retest.
WARNING
C
ap
ac
ito
r
Disconnect Electrical Power Supply:
TESTING CAPACITOR RESISTANCE
2. Set an ohmmeter on its highest ohm scale and connect
the leads to the capacitor A. Good Condition - indicator swings to zero and slowly
returns to infinity. (Start capacitor will bleed resistor will
not return to infinity. It will still read the resistance of
the resistor).
B. Shorted - indicator swings to zero and stops there replace.
C. Open - no reading - replace. (Start capacitor would
read resistor resistance).
S-15B Capacitance Check
Using a hookup as shown below, take the amperage and
voltage readings and use them in the formula:
30
1. Remove the motor leads from its respective connection
points and capacitor (if applicable).
2. Check the continuity between each of the motor leads.
3. Touch one probe of the ohmmeter to the motor frame
(ground) and the other probe in turn to each lead.
If the windings do not test continuous or a reading is obtained from lead to ground, replace the motor.
S-17 CHECKING COMPRESSOR WINDINGS
WARNING
HERMETIC COMPRESSOR ELECTRICAL TERMINAL
VENTING CAN BE DANGEROUS. WHEN INSULATING
MATERIAL WHICH SUPPORTS A HERMETIC COMPRESSOR ELECTRICAL TERMINAL SUDDENLY DISINTEGRATES DUE TO PHYSICAL ABUSE OR AS A RESULT OF AN ELECTRICAL SHORT BETWEEN THE TERMINAL AND THE COMPRESSOR HOUSING, THE TERMINAL MAY BE EXPELLED, VENTING THE VAPOROUS
AND LIQUID CONTENTS OF THE COMPRESSOR HOUSING AND SYSTEM.
SERVICING
If the compressor terminal PROTECTIVE COVER and gasket (if required) is not properly in place and secured, there
is a remote possibility if a terminal vents, that the vaporous
and liquid discharge can be ignited, spouting flames several feet, causing potentially severe or fatal injury to anyone in its path.
This discharge can be ignited external to the compressor if
the terminal cover is not properly in place and if the discharge impinges on a sufficient heat source.
Ignition of the discharge can also occur at the venting terminal or inside the compressor, if there is sufficient contaminant air present in the system and an electrical arc
occurs as the terminal vents.
Ignition cannot occur at the venting terminal without the
presence of contaminant air, and cannot occur externally
from the venting terminal without the presence of an external ignition source.
Therefore, proper evacuation of a hermetic system is essential at the time of manufacture and during servicing.
To reduce the possibility of external ignition, all open flame,
electrical power, and other heat sources should be extinguished or turned off prior to servicing a system.
If the following test indicates shorted, grounded or open
windings, see procedures S-19 for the next steps to be
taken.
S-17A Resistance Test
Each compressor is equipped with an internal overload.
The line break internal overload senses both motor amperage and winding temperature. High motor temperature or
amperage heats the disc causing it to open, breaking the
common circuit within the compressor on single phase units.
The three phase internal overload will open all three legs.
Heat generated within the compressor shell, usually due to
recycling of the motor, high amperage or insufficient gas to
cool the motor, is slow to dissipate, allow at least three to
four hours for it to cool and reset, then retest.
C
OHMMETER
R
S
COMP
TESTING COMPRESSOR WINDINGS
If either winding does not test continuous, replace the compressor.
NOTE: If an open compressor is indicated allow ample
time for the internal overload to reset before replacing compressor.
S-17B Ground Test
If fuse, circuit breaker, ground fault protective device, etc.,
has tripped, this is a strong indication that an electrical problem exists and must be found and corrected. The circuit
protective device rating must be checked and its maximum
rating should coincide with that marked on the equipment
nameplate.
With the terminal protective cover in place, it is acceptable
to replace the fuse or reset the circuit breaker ONE TIME
ONLY to see if it was just a nuisance opening. If it opens
again, DO NOT continue to reset.
Disconnect all power to unit, making sure that all power
legs are open.
1. DO NOT remove protective terminal cover. Disconnect
the three leads going to the compressor terminals at
the nearest point to the compressor.
WARNING
DAMAGE CAN OCCUR TO THE GLASS EMBEDDED
TERMINALS AT THIS POINT IF THE LEADS ARE NOT
PROPERLY REMOVED, WHICH CAN RESULT IN THE
TERMINAL VENTING AND HOT OIL DISCHARGING.
WARNING
Disconnect Electrical Power Supply:
1. Remove the leads from the compressor terminals.
WARNING
SEE WARNING S-17 PAGE 66 BEFORE REMOVING
COMPRESSOR TERMINAL COVER.
2. Using an ohmmeter, test continuity between terminals
S-R, C-R, and C-S, on single phase units or terminals
T2, T2 and T3, on 3 phase units.
HI-POT
COMPRESSOR GROUND TEST
31
SERVICING
2. Identify the leads and using a Megger, Hi-Potential
Ground Tester, or other suitable instrument which puts
out a voltage between 300 and 1500 volts, check for a
ground separately between each of the three leads and
ground (such as an unpainted tube on the compressor). Do not use a low voltage output instrument such
as a volt-ohmmeter.
3. If a ground is indicated, then carefully remove the compressor terminal protective cover and inspect for loose
leads or insulation breaks in the lead wires.
4. If no visual problems indicated, carefully remove the
leads at the compressor terminals.
Carefully retest for ground, directly between compressor terminals and ground.
5. If ground is indicated, replace the compressor.
COPELAND COMPRESSOR
E
·
93
J
123456
Motor Shift Year Month Serial No
TECUMSEH COMPRESSOR
T:
G
22
93C
123456
Month Day Year
Serial No
BRISTOL COMPRESSOR
291
93
123456
S-17C Operation Test
If the voltage, capacitor, overload and motor winding test
fail to show the cause for failure:
WARNING
Disconnect Electrical Power Supply:
1. Remove unit wiring from disconnect switch and wire a
test cord to the disconnect switch.
NOTE: The wire size of the test cord must equal the line
wire size and the fuse must be of the proper size and type.
2. With the protective terminal cover in place, use the three
leads to the compressor terminals that were disconnected at the nearest point to the compressor and connect the common, start and run clips to the respective
leads.
Day of
Year
Year
Serial No
S-18 TESTING CRANKCASE HEATER
The crankcase heater must be energized a minimum of
four (4) hours before the condensing unit is operated.
Crankcase heaters are used to prevent migration or accumulation of refrigerant in the compressor crankcase during
the off cycles and prevents liquid slugging or oil pumping
on start up. Scroll Compressors are not equipped with a
crankcase heaters.
A crankcase heater will not prevent compressor damage
due to a floodback or over charge condition.
WARNING
3. Connect good capacitors of the right MFD and voltage
rating into the circuit.
Disconnect Electrical Power Supply:
4. With power ON, close the switch.
1. Disconnect the heater lead wires.
WARNING
LINE VOLTAGE NOW PRESENT
A.
If the compressor starts and continues to run, the
cause for failure is somewhere else in the system.
B.
If the compressor fails to start - replace.
Compressor Serial Number Identification
2. Using an ohmmeter, check heater continuity - should
test continuous, if not, replace.
NOTE: The positive temperature coefficient crankcase
heater is a 40 watt 265 voltage heater. The cool resistance
of the heater will be approximately 1800 ohms. The resistance will become greater as the temperature of the compressor shell increases.
S-21 CHECKING REVERSING VALVE AND SOLENOID
Occasionally the reversing valve may stick in the heating
or cooling position or in the mid-position.
32
When stuck in the mid-position, part of the discharge gas
from the compressor is directed back to the suction side,
resulting in excessively high suction pressure. An increase
in the suction line temperature through the reversing valve
can also be measured. Check operation of the valve by
starting the system and switching the operation from COOLING to HEATING cycle.
SERVICING
If the valve fails to change its position, test the voltage (24V)
at the valve coil terminals, while the system is on the COOLING cycle.
This control has a self diagnostic feature. Before performing any test observe the LED indicators and compare to
the chart below for board status.
If no voltage is registered at the coil terminals, check the
operation of the reversing relay and the continuity of the
connecting wires.
If voltage is registered at the coil, tap the valve body lightly
while switching the system from HEATING to COOLING,
etc. If this fails to cause the valve to switch positions, remove the coil connector cap and test the continuity of the
reversing valve solenoid coil. If the coil does not test continuous - replace it.
If the valve is inoperative - replace it.
S-22 REVERSING VALVE REPLACEMENT
LED 1
LED 2
BOTH FLASHING
ALTERNATING
FLASHING
ON
OFF
ON
ON
DIAGNOSTICS
NORMAL OPERATION
SHORT CYCLE
LOCKOUT
BOARD FAILURE
Normal sequence of operation, Heating Mode.
1. If the compressor has been off for at least 3 minutes
when a call for heat is received, the compressor is immediately energized. The indoor blower is energized
at the cooling speed after a 7 second delay.
When brazing a reversing valve into the system, it is of
extreme importance that the temperature of the valve does
not exceed 250°F. at any time.
2. If the compressor has not been off for at least 3 minutes
when a call for heating is received, the control waits at
least 3 minutes before energizing the compressor. The
LED will flash 6 times when the compressor is delayed
on the anti-short cycle timer.
Wrap the reversing valve with a large rag saturated with
water. "Re-wet" the rag and thoroughly cool the valve after
each brazing operation of the four joints involved. The wet
rag around the reversing valve will eliminate conduction of
heat to the valve body when brazing the line connection.
4. If power to the control is interrupted, the compressor
will be energized after a 3 minute delay after power is
re-applied to the control. The control will flash 6 times
to indicate the compressor is delayed on the anti-short
cycle timer.
The use of a wet rag sometimes can be a nuisance. There
are commercial grades of heat absorbing paste that may
be substituted.
The following has been simplified in order to illustrate the
Electronic functions:
Remove the refrigerant charge from the system.
After the valve has been installed, leak test, evacuate and
recharge.
S-23 CHECKING DEFROST CONTROL BOARD
5. When the defrost thermostat (30/60 control) closes (coil
temperature at approximately 30°F.), the solid state
board becomes programmed.
The Defrost Control Board is an electronic device which is
not field repairable. If a malfunction should occur the complete board must be replaced. The board has anti-short cycle
protection, high and low pressure switch interrupts incorporated into the control.
OR
28
GY
55
Y L -5
CO MMO N
Y1 OUT
A
R
P S2
P
S B
1
A
P S1
DF
O
G
2
1
DE FR OS T
CO N TRO L
D I A G N O S T IC S
LE D
FA N
G
E
C
W
R
O
Y
4. If power to the control is interrupted, the compressor
will be energized after a 3 minute delay after power is
re-applied to the control. The control will flash 6 times
to indicate the compressor is delayed on the anti-short
cycle timer.
G Y -8
R E V E R S IN G
S O L E N O ID
OUT
2. If the compressor has not been off for at least 3 minutes
when a call for cooling is received, the control waits at
least 3 minutes before energizing the compressor. The
LED will flash 6 times when the compressor is delayed
on the anti-short cycle timer.
DEFROST
THERMOSTAT
FU SE
Normal sequence of operation, Cooling Mode.
1. If the compressor has been off for at least 3 minutes
when a call for cool is received, the compressor is immediately energized. The indoor blower is energized
at the cooling speed after a 7 second delay.
C O O L IN G
S W IT C H
RE LA Y
R D -2 4
+ 24 V
O . D.
FA N
M OTOR
SE E
D E T A IL 1
60
30
90
TE ST
HE AT CR AF T
A D J U S T A B L E D E F R O S T IN T E R V A L
(F A C T O R Y S E T T I N G A S S H O W N )
D E T A IL 1
DEFROST CONTROL BOARD
5. The control de-energizes the indoor blower 60 seconds
after the call for cooling is removed.
33
SERVICING
NOTE: If the board is powered up with the jumper connected to the test pins, the board will ignore test and default to 90 minute time. If the jumper is left on the test connection for more than ten minutes, the board will ignore
test jumper and default to 90 minute time. If jumper is missing, the board will default to 90 minute time.
6. Whenever the (CC) compressor contactor is energized,
the solid state timer counts the compressor run time.
Total accumulated minutes (run time) is retained as long
as the Defrost (30/60) control stays closed. With the
jumper connected to the 90 minute pins, the compressor run time is 90 minutes (factory wired). The board
has jumper pin for 60 and 30 minute times as well. Timer
count time may be accelerated for testing only, by placing jumper on test pins. (Example: 90 minutes = approximately 21 seconds). Remove the jumper when the
board goes into defrost mode. If the jumper is not removed, the timer will remain accelerated through the
defrost period.
7. At end of the programmed time, common circuit (C) is
made to the (OUT) terminal. The reversing solenoid becomes energized and will stay energized until defrost
(30/60) control opens by coil temperature, or after 10
minutes of run time. Maximum defrost time limited to 10
minutes compressor run time. During the defrost time,
the board will apply power to the "W" terminal to bring
on supplemental electric heat (if installed).
8. The control de-energizes the indoor blower 60 seconds
after the call for heating is removed.
S-24 TESTING DEFROST BOARD
To check the defrost timer board for proper sequencing,
proceed as follows: With power ON; unit not running.
1. Jumper defrost (30/60 control by placing a jumper wire
across "DF" terminals.) terminal at defrost timer board.
2. Connect jumper across test pins on defrost control
board.
3. Set thermostat to call for heating. System should go
into defrost within 21 seconds.
4. Immediately remove jumper from test pins.
5. Using VOM check for voltage across OUT Terminals
(BK-19 & BK-20). meter should read 24 volts.
6. Using VOM check for voltage across Fan terminals on
the board (VT-62 & VT-16). You should read line voltage (208-230 VAC) indicating the relay is open in the
defrost mode.
7. Using VOM check for voltage across "W & C" terminals
on the board. You should read 24 volts.
8. If not as above, replace control board.
9. Set thermostat to off position and disconnect power before removing any jumpers or wires.
34
NOTE: Remove jumper across defrost thermostat and replace jumper to 30, 60, or 90 minute position before returning system to service.
S-25 TESTING DEFROST CONTROL (30°/60°)
1. Install a thermocouple type temperature test lead on
the tube adjacent to the defrost control. Insulate the
lead point of contact.
2. Check the temperature at which the control closes its
contacts (30°F. ± 5°F.)
3. Raise the temperature of the control until opens
(60°F. ± 5°F.)
4. If not as above, replace control.
S-50 CHECKING HEATER LIMIT CONTROL(S)
(OPTIONAL ELECTRIC HEATERS)
Each individual heater element is protected with an automatic rest limit control connected in series with each element to prevent overheating of components in case of low
airflow. This limit control will open its circuit at approximately 150°F. and close at 110°F.
WARNING
Disconnect Electrical Power Supply:
1. Remove the wiring from the control terminals.
2. Using an ohmmeter test for continuity across the normally closed contacts. No reading indicates the control
is open - replace if necessary.
IF FOUND OPEN - REPLACE - DO NOT WIRE AROUND.
S-52 CHECKING HEATER ELEMENTS
Optional electric heaters may be added, in the quantities
shown in the specifications section to provide electric resistance heating. Under no condition shall more heaters
than the quantity shown be installed.
The low voltage circuit in the blower section is factory wired
and terminates at the location provided for the electric
heater(s).
WARNING
Disconnect Electrical Power Supply:
1. Disassemble and remove the heating element.
2. Visually inspect the heater assembly for any breaks in
the wire or broken insulators.
3. Using an ohmmeter, test the element for continuity - no
reading indicates the element is open. Replace as necessary.
See "Electric Heater" in the Product Design Section (page
23) to verify heater amperage and temperature rise.
SERVICING
S-53 OUTDOOR TEMPERATURE CONTROL
(OPTIONAL ITEM)
ATK01 This kit includes an ambient thermostat mounted
in a weatherproof box for installation exterior to the unit.
This kit is used for ambient control on all Amana package
models and remote cooling models.
WARNING
Disconnect Electrical Power Supply:
At any time the system has been open for repair, a liquid
line filter dryer must be installed. The dryer should be installed between the partition panel and the expansion device.
Heat pump models will require a bi-flow dryer.
BRAZING MATERIALS
Copper to Copper Joints - Sil-Fos used without flux (alloy
of 15% silver, 80% copper, and 5% phosphorous). Recommended heat 1400°F.
1. Remove field connected low voltage wires from control
terminals.
Copper to Steel Joints - Silver Solder used without a flux
(alloy of 30% silver, 38% copper, 32% zinc). Recommended
heat - 1200°F.
2. In ambient temperatures below 60°F, set the knob to
correspond with the actual temperature of the control.
S-101 LEAK TESTING
3. Using an ohmmeter, test for continuity between the control terminals. It should not test continuous. The control
is designed to open at this point with a manual differential of approximately 4°F.
4. In ambient temperatures above 60°F., it will be necessary to chill the control.
Refrigerant leaks are best detected with a halide or electronic leak detector.
However, on outdoor installed systems, provisions must be
made to shield the copper element of an halide torch from
the sun and wind conditions in order to be able to see the
element properly.
NOTE: The flame of the halide detector will glow green in
the presence of R-22 refrigerant.
For a system that contains a refrigerant charge and is suspected of having a leak, stop the operation and hold the
exploring tube of the detector as close to the tube as possible, check all piping and fittings. If a leak is detected, do
not attempt to apply more brazing to the joint. Remove and
capture the charge, unbraze the joint, clean and rebraze.
OUTDOOR TEMPERATURE CONTROL
S-100 REFRIGERATION REPAIR PRACTICE
DANGER
ALWAYS REMOVE THE REFRIGERANT CHARGE IN A
PROPER MANNER BEFORE APPLYING HEAT TO THE
SYSTEM.
When repairing the refrigeration system:
1. Never open a system that is under vacuum. Air and
moisture will be drawn in.
2. Plug or cap all openings.
3. Remove all burrs and clean the brazing surfaces of the
tubing with sand cloth or paper. Brazing materials do
not flow well on oxidized or oily surfaces.
4. Clean the inside of all new tubing to remove oils and
pipe chips.
5. When brazing, sweep the tubing with dry nitrogen to
prevent the formation of oxides on the inside surfaces.
6. Complete any repair by replacing the liquid line drier in
the system, evacuate and charge.
For a system that has been newly repaired and does not
contain a charge, connect a cylinder of refrigerant, through
a gauge manifold, to the liquid and suction line dill valves
and/or liquid line dill valve and compressor process tube.
NOTE: Refrigerant hoses must be equipped with dill valve
depressors or special adaptor used. Open the valve on the
cylinder and manifold and allow the pressure to build up
within the system. Check for and handle leaks, as described
above. After the test has been completed, remove and
capture the leak test refrigerant.
S-102 EVACUATION
This is the most important part of the entire service procedure. The life and efficiency of the equipment is dependent
upon the thoroughness exercised by the serviceman when
evacuating air (non-condensable) and moisture from the
system.
Air in a system causes high condensing temperature and
pressure, resulting in increased power input and reduced
performance.
Moisture chemically reacts with the refrigerant and oil to
form corrosive hydrofluoric and hydrochloric acids. These
attack motor windings and parts, causing breakdown.
35
SERVICING
The equipment required to thoroughly evacuate the system is a high vacuum pump, capable of producing a vacuum
equivalent to 25 microns absolute and a thermocouple
vacuum gauge to give a true reading of the vacuum in the
system.
4. If the vacuum pump is working properly, close the valve
to the vacuum thermocouple gauge and open the high
and low side valves to the high vacuum manifold set.
With the valve on the charging cylinder closed, open
the manifold valve to the cylinder.
NOTE: Never use the system compressor as a vacuum
pump or run when under a high vacuum. Motor damage
could occur.
5. Evacuate the system to at least 29 inches gauge before opening valve to thermocouple vacuum gauge.
WARNING
SCROLL COMPRESSORS: DO NOT FRONT SEAT THE
SERVICE VALVE(S) WITH THE COMPRESSOR OPERATING IN AN ATTEMPT TO SAVE REFRIGERANT. WITH
THE SUCTION LINE OF THE COMPRESSOR CLOSED
OR SEVERALLY RESTRICTED, THE SCROLL COMPRESSOR CAN AND WILL DRAW A DEEP VACUUM
VERY QUICKLY. THIS VACUUM CAN CAUSE INTERNAL ARCING OF THE FUSITE RESULTING IN A DAMAGED OR FAILED COMPRESSOR.
TO
RELATED
GAUGE
PORTS OF
COND. UNIT
THERMOCOUPLE
VACUUM
GAUGE
DIAL-A-CHARGE
CHARGING CYLINDER
D
B
HIGH SIDE
GAUGE
E
8. Close valve to thermocouple vacuum gauge and vacuum
pump. Shut off pump and prepare to charge.
S-103 CHARGING
Charge the system with the exact amount of refrigerant.
Refer to the specification section or check the unit nameplates for the correct refrigerant charge.
F
C
HIGH SIDE VALVE
LOW SIDE VALVE
VACUUM PUMP
THERMOCOUPLE GAUGE
MANIFOLD GAUGE
CHARGING CYLINDER
1. When using an ambient compensated calibrated charging cylinder, allow liquid refrigerant only to enter the high
side.
2. After the system will take all it will take, close the valve
on the high side of the charging manifold.
A
LARGE DIAMETER
BRAIDED VACUUM
HOSES
HIGH VACUUM PUMP
EVACUATION
1. Connect the vacuum pump, vacuum tight manifold set
with high vacuum hoses, thermocouple vacuum gauge
and charging cylinder as shown.
2. If the service dill valves are to be used for evacuation, it
is recommended that a core remover be used to lift the
core for greater efficiency.
3. Start the vacuum pump and open the shut off valve to
the high vacuum gauge manifold only. After the compound gauge (low side) has dropped to approximately
29 inches of vacuum, open the valve to the vacuum
thermocouple gauge. See that the vacuum pump will
blank-off to a maximum of 25 microns. A high vacuum
pump can only produce a good vacuum if its oil is noncontaminated.
36
7. If thermocouple vacuum gauge continues to rise and
levels off at about 5000 microns, moisture and non-condensables are still present. If gauge continues to rise a
leak is present. Repair and re-evacuate.
An inaccurately charged system will cause future problems.
LOW SIDE
GAUGE
HIGH VACUUM
MANIFOLD
A.
B.
C.
D.
E.
F.
6. Continue to evacuate to a minimum of 250 microns.
Close valve to vacuum pump and watch rate of rise. If
vacuum does not rise above 1500 microns in three to
five minutes, system can be considered properly evacuated.
3. Start the system and charge the balance of the refrigerant through the low side. DO NOT charge in a liquid
form.
4. With the system still running, close the valve on the
charging cylinder. At this time, you may still have some
liquid refrigerant in the charging cylinder hose and will
definitely have liquid in the liquid hose. Reseat the liquid line core. Slowly open the high side manifold valve
and transfer the liquid refrigerant from the liquid line hose
and charging cylinder hose into the suction service valve
port. CAREFUL: Watch so that liquid refrigerant does
not enter the compressor.
5. With the system still running, reseat the suction valve
core, remove hose and reinstall both valve core caps.
6. Check system for leaks.
NOTE: THIS CHARGING PROCEDURE CAN ONLY BE
DONE IN THE COOLING MODE OF OPERATION. ALL
MODELS WITH COMPRESSOR PROCESS TUBE ACCESS VALVE CAN BE PROCESSED IN HEATING CYCLE
IF THIS VALVE IS USED.
SERVICING
Units having capillary tubes or flow control restrictors can
be checked against the Desired Superheat vs. Outdoor
Temperature Chart in this section. Coils with thermostatic
expansion valves (TXV's) must be checked by subcooling.
See "Checking Subcooling and Superheat" sections in this
manual.
If a restriction is located, replace the restricted part, replace
drier, evacuate and recharge.
S-104 CHECKING COMPRESSOR EFFICIENCY
The reason for compressor inefficiency is broken or damaged suction and/or discharge valves, or scroll flanks on
Scroll compressors, reducing the ability of the compressor
to pump refrigerant vapor.
The condition of the valves or scroll flanks is checked in the
following manner.
1. Attach gauges to the high and low side of the system.
2. Start the system and run a "Cooling Performance Test.
If the test shows-
The bulb must be securely fastened to a clean straight section of the suction line. Application of the bulb to a horizontal run of line is preferred. If a vertical installation cannot
be avoided the bulb should be mounted so that the capillary tubing comes out at the top.
THE VALVES PROVIDED BY AMANA ARE DESIGNED
TO MEET THE SPECIFICATION REQUIREMENTS FOR
OPTIMUM PRODUCT OPERATION. DO NOT USE SUBSTITUTES.
S-106 OVERFEEDING
Overfeeding by the expansion valve results in high suction
pressure, cold suction line, and possible liquid slugging of
the compressor.
If these symptoms are observed:
1. Check for an overcharged unit by referring to the cooling performance charts in the servicing section.
2. Check the operation of the power element in the valve
as explained in S-26 Checking Expansion Valve Operation.
⇒
Below normal high side pressure.
⇒
Above normal low side pressure.
⇒
Low temperature difference across coil.
S-107 UNDERFEEDING
⇒
Low amp draw at compressor.
Underfeeding by the expansion valve results in low system
capacity and low suction pressures.
-and the charge is correct. The compressor is faulty - replace the compressor. NOTE: THIS TEST CANNOT BE
DONE IN THE HEATING MODE
S-105 THERMOSTATIC EXPANSION VALVE
The expansion valve is designed to control the rate of liquid refrigerant flow into an evaporator coil in exact proportion to the rate of evaporation of the refrigerant in the coil.
The amount of refrigerant entering the coil is regulated since
the valve responds to temperature of the refrigerant gas
leaving the coil (feeler bulb contact) and the pressure of
the refrigerant in the coil.
This regulation of the flow prevents the return of liquid refrigerant to the compressor.
The three forces which govern the operation of the valve
are: (1) the pressure created in the power assembly by the
feeler bulb, (2) evaporator pressure, and (3) the equivalent
pressure of the superheat spring in the valve.
0% bleed type expansion valves are used on the indoor
coils. The 0% valve will not allow the system pressures
(High and Low side) to equalize during the shut down period. The valve will shut off completely at approximately
100 PSIG Pressure.
Good thermal contact between the feeler bulb and the suction line is essential to satisfactory valve control and performance.
3. Check for restricted or plugged equalizer tube.
If these symptoms are observed:
1. Check for a restricted liquid line or drier. A restriction
will be indicated by a temperature drop across the drier.
2. Check the operation of the power element of the valve
as described in S-26 Checking Expansion Valve Operation.
S-108 SUPERHEAT
The expansion valves are factory adjusted to maintain 12
to 18 degrees superheat of the suction gas. Before checking the superheat or replacing the valve, perform all the
procedures outlined under Air Flow, Refrigerant Charge,
Expansion Valve - Overfeeding, Underfeeding. These are
the most common causes for evaporator malfunction.
CHECKING SUPERHEAT
Refrigerant gas is considered superheated whenever its
temperature is higher than the saturation temperature corresponding to its pressure. The degree of superheat equals
the degrees of temperature increase above the saturation
temperature at existing pressure. See Temperature - Pressure Chart.
1. Attach an accurate thermometer or preferably a thermocouple type temperature tester to the suction line at
a point at least 6" from the compressor.
2. Install a low side pressure gauge on the suction line
service valve at the outdoor unit.
3. Record the gauge pressure and the temperature of the
line.
37
SERVICING
4. Convert the suction pressure gauge reading to temperature by finding the gauge reading in Temperature - Pressure Chart and reading to the left, find the temperature
in the °F. Column.
5. The difference between the thermometer reading and
pressure to temperature conversion is the amount of
superheat.
EXAMPLE:
a. Suction Pressure = 84
S-109 CHECKING SUBCOOLING
Refrigerant liquid is considered subcooled whenever its temperature is lower than the saturation temperature corresponding to its pressure. The degree of subcooling equals
the degrees of temperature decrease below the saturation
temperature at the existing pressure.
1. Attach an accurate thermometer or preferably a thermocouple type temperature tester to the liquid line as it
leaves the condensing unit.
2. Install a high side pressure gauge on the high side service valve at the front of the unit.
b. Corresponding Temp. °F. = 50
c. Thermometer on Suction Line = 63°F.
To obtain the degrees temperature of superheat subtract
50.0 from 63.0°F.
The difference is 13° Superheat. The 13° Superheat would
fall in the ± range of allowable superheat.
SUPERHEAT ADJUSTMENT
The expansion valves used on Amana coils are factory set
and are not field adjustable. If the superheat setting becomes disturbed, replace the valve.
3. Record the gauge pressure and the temperature of the
line.
4. Convert the discharge pressure gauge reading to temperature by finding the gauge reading in Temperature Pressure Chart and reading to the left, find the temperature in the °F. Column.
5. The difference between the thermometer reading and
pressure to temperature conversion is the amount of
subcooling.
DESIRED SUPERHEAT vs OUTDOOR TEMPERATURE
36
34
32
90
°F
28
26
24
22
75
°F
°F
70
20
or
do
In
SUPERHEAT @ O.D. UNIT
30
18
16
80
°F
In
do
or
85
°F
In
do
or
Ind
oo
r
In
do
or
14
12
10
8
6
4
50
60
70
80
90
OUTDOOR TEMPERATURE
38
100
110
120
SERVICING
EXAMPLE:
a. Discharge Pressure = 260
The difference is 11° subcooling. The normal subcooling
range is 9° - 13° subcooling for heat pumps units, 14° - 18°
for cooling units and gas packs.
b. Corresponding Temp. °F. = 120°
c. Thermometer on Liquid line = 109°F.
To obtain the amount of subcooling subtract 109°F from
120°F.
TEMPERATURE - PRESSURE (R-22)
Temp.
°F.
Gauge Pressure
(PSIG) Freon-22
Temp.
°F.
Gauge Pressure
(PSIG) Freon-22
-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
0.61
1.42
2.27
3.15
4.07
5.02
6.01
7.03
8.09
9.18
10.31
11.48
12.61
13.94
15.24
16.59
17.99
19.44
20.94
22.49
24.09
25.73
27.44
29.21
31.04
32.93
34.88
36.89
38.96
41.09
43.28
45.53
47.85
50.24
52.70
55.23
57.83
60.51
63.27
66.11
69.02
71.99
75.04
78.18
81.40
84.70
88.10
91.5
56
58
95.1
98.8
60
62
64
65
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
96
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
132
134
136
136
140
142
144
146
158
150
152
154
156
158
160
102.5
106.3
110.2
114.2
118.3
122.5
126.8
131.2
135.7
140.5
145.0
149.5
154.7
159.8
164.9
170.1
175.4
180.9
186.5
192.1
197.9
203.8
209.9
216.0
222.3
228.7
235.2
241.9
248.7
255.6
262.6
269.7
276.9
284.1
291.4
298.8
306.3
314.0
321.9
329.9
338.0
346.3
355.0
364.3
374.1
384.3
392.3
401.3
411.3
421.8
433.3
S-110 CHECKING EXPANSION VALVE OPERATION
1. Remove the remote bulb of the expansion valve from
the suction line.
2. Start the system and cool the bulb in a container of ice
water, closing the valve. As you cool the bulb the suction pressure should fall and the suction temperature
will rise.
3. Next warm the bulb in your hand. As you warm the
bulb the suction pressure should rise and the suction
temperature will fall.
4. If a temperature or pressure change is notices, the expansion valve is operating. If no change is noticed, the
valve is restricted, the power element is faulty, or the
equalizer tube is plugged.
5. Remove the charge, replace the valve and drier, evacuate and recharge.
S-111 FIXED ORIFICE RESTRICTION DEVICES
The fixed orifice restriction device (flowrator) used in conjunction with the indoor and outdoor coils are a predetermined bore (I.D.).
It is designed to control the rate of liquid refrigerant flow
into an evaporator coil.
The amount of refrigerant that flows through the fixed orifice restriction device is regulated by the pressure difference between the high and low sides of the system.
In the cooling cycle when the outdoor air temperature rises,
the high side condensing pressure rises. At the same time,
the cooling load on the indoor coil increases, causing the
low side pressure to rise, but at a slower rate.
Since the high side pressure rises faster when the temperature increases, more refrigerant flows to the evaporator, increasing the cooling capacity of the system.
When the outdoor temperature falls, the reverse takes place.
The condensing pressure falls, and the cooling loads on
the indoor coil decreases, causing less refrigerant flow.
A strainer is placed on the entering side of the tube to prevent any foreign material from becoming lodged inside the
fixed orifice restriction device.
If a restriction should become evident, proceed as follows:
1. Recover refrigerant charge.
2. Remove the orifice or tube strainer assembly and replace.
3. Replace liquid line drier, evacuate and recharge.
39
SERVICING
CHECKING EQUALIZATION TIME
During the "OFF" cycle, the high side pressure bleeds to
the low side through the fixed orifice restriction device.
Check equalization time as follows:
1. Attach a gauge manifold to the suction and liquid line
dill valves.
2. Start the system and allow the pressures to stabilize.
S-114 NON-CONDENSABLES
If non-condensables are suspected shut down the system
and allow the pressures to equalize, wait at least 15 minutes. Compare the pressure, to the temperature of the coldest coil since this is where most of the refrigerant will be. If
the pressure indicates a higher temperature than that of
the coil temperature, non-condensables are present.
3. Stop the system and check the time it takes for the high
and low pressure gauge readings to equalize.
Non-condensables are removed from the system by first
removing the refrigerant charge, replacing and/or installing
liquid line drier, evacuate and recharging.
If it takes more than seven (7) minutes to equalize, the restriction device is inoperative. Replace, install a liquid line
drier, evacuate and recharge.
S-115 COMPRESSOR BURNOUT
S-112 CHECKING RESTRICTED LIQUID LINE
When the system is operating, the liquid line is warm to the
touch. If the liquid line is restricted, a definite temperature
drop will be noticed at the point of restriction. In severe
cases, frost will form at the restriction and extend down the
line in the direction of the flow.
Discharge and suction pressures will be low, giving the appearance of an undercharged unit. However, the unit will
have normal to high subcooling.
If a restriction is located, replace the restricted part, replace
drier, evacuate and recharge.
S-113 OVERCHARGE OF REFRIGERANT
An overcharge of refrigerant is normally indicated by an
excessively high head pressure.
An evaporator coil, using an expansion valve metering device, will basically modulate and control a flooded evaporator and prevent liquid return to the compressor.
An evaporator coil, using a fixed orifice metering device,
could allow refrigerant to return to the compressor under
extreme overcharge conditions. Also with a fixed orifice
metering device, extreme cases of insufficient indoor air
can cause icing of the indoor coil and liquid return to the
compressor, but the head pressure would be lower.
There are other causes for high head pressure which may
be found in the "Service Problem Analysis Guide."
If other causes check out normal, an overcharge or a system containing non-condensables would be indicated.
If this is observed:
1. Start the system.
2. Remove small quantities of gas from the suction line dill
valve until the head pressure is reduced to normal.
3. Observe the system while running a cooling performance
test, if a shortage of refrigerant is indicated, then the
system contains non-condensables.
40
When a compressor burns out, high temperature develops
causing the refrigerant, oil and motor insulation to decompose forming acids and sludge.
If a compressor is suspected of being burned-out, attach a
refrigerant hose to the liquid line dill valve and properly remove and dispose of the refrigerant.
Now determine if a burn out has actually occurred. Confirm by analyzing an oil sample using a Sporlan Acid Test
Kit, AK-3 or its equivalent.
Remove the compressor and obtain an oil sample from the
suction stub. If the oil is not acidic, either a burnout has not
occurred or the burnout is so mild that a complete cleanup
is not necessary.
If acid level is unacceptable the system must be cleaned
by using the cleanup drier method.
CAUTION
DO NOT ALLOW THE SLUDGE OR OIL TO CONTACT
THE SKIN, SEVERE BURNS MAY RESULT.
NOTE: The Flushing Method using R-11 refrigerant is no
longer approved by Amana Refrigeration, Inc.
Suction Line Drier Clean-Up Method
Use AMANA part number R0157057 Suction Line Drier
Clean-Up Kit (41 cubic inches). This drier should be installed as close to the compressor as possible, either in a
vertical or horizontal position. It may be necessary to use
new tubing and form as required.
In all applications, the drier inlet must be above the drier
outlet to provide proper oil return to the compressor.
NOTE: At least twelve (12) inches of the suction line immediately out of the compressor stub must be discarded
due to burned residue and contaminates.
1. Remove compressor discharge line strainer, liquid line
strainer and/or dryer and capillary tubes from indoor and
outdoor coils.
2. On an expansion valve coil, remove the liquid line drier
and expansion valve.
3. Purge all remaining components with dry nitrogen or
carbon dioxide until clean.
SERVICING
4. Install new components including liquid liner drier.
5. Install suction line drier.
6. Braze all joints, leak test, evacuate, and recharge system.
7. Start up the unit and record the pressure drop across
the cleanup drier.
8. Continue to run the system for a minimum of twelve
(12) hours and recheck the pressure drop across the
drier. Pressure drop should not exceed 6 - 8 PSIG.
9. Continue to run the system for several days repeatedly
checking pressure drop across the suction line drier. If
the pressure drop never exceeds the 6 - 8 PSIG, the
drier must be adequate and is trapping the contaminants and it is permissible to leave it in the system.
10. If the pressure drop becomes greater, then it must be
replaced and steps 5 through 9 repeated until it does
not exceed 6 - 8 PSIG.
NOTICE: Regardless, the cause for burnout must be determined and corrected before the new compressor is
started.
S-201 CHECKING EXTERNAL STATIC PRESSURE
The minimum and maximum allowable duct static pressure
is found in the specification section.
Too great of an external static pressure will result in insufficient air that can cause icing of the coil, whereas too much
air can cause poor humidity control, and condensate to be
pulled off the evaporator coil causing condensate leakage.
Too much air can cause motor overloading and in many
cases this constitutes a poorly designed system. To determine proper air movement, proceed as follows:
1. Using a draft gauge (inclined manometer) measure the
static pressure of the return duct at the inlet of the unit,
(Negative Pressure).
2. Measure the static pressure of the supply duct, (Positive Pressure).
3. Add the two readings together.
NOTE: Both readings may be taken simultaneously and
read directly on the manometer if so desired.
4. Consult proper table for quantity of air.
If the external static pressure exceeds the minimum or maximum allowable statics, check for closed dampers, dirty filters, undersized or poorly laid out ductwork.
S-202 ECM/ICM Motors
ECM/ICM Features
Many of the Amana high efficiency package units incorporate the GE© ICM or variable speed blower motors for greater
efficiency. ECM/ICM motors vary the motor RPMs to provide a set volume of air over a wide range of conditions.
ECM/ICM Control Connections
Control functions (G, Y1, Y2) May be Active at less than 1/
2 control voltage. (i.e. 12 volts). Relay contacts on control
functions must reliably switch low currents (less than 5 MA).
Some thermostats (with triac switches) and Solid State
Relays may allow enough "leakage" current to Turn on "G".
Thermostats that "steal" power thru "Y" or other functions
are not compatible.
The ECM control interface can be as simple as a direct
connection to the thermostat. For example: R to G will cause
fan to come at "fan-only" cfm. R to G to Y will cause fan to
come on at cooling speed. The ECM/ICM control requires
a common connection from the transformer (transformer
common to C1, C2 on control). In typical applications C1
and C2 will be tied together. Additional features can be utilized with an interface control board (speed tap board), these
features include; 2 Cool CFMs, 2 Dehumidification CFMs,
2 Heat CFMs, emergency heat CFM, separate Fan-Only
CFM, and feed back information (CFM demand).
Testing ECM/ICM Motors
ECM/ICMs connect directly to the Line. DO NOT Insert
Contactors in Series with the ECM/ICM Motor AC line. Control is powered continuously to Insure reliable start-up. Plug
is polarized, verify and reverify correct connector orientation before applying power. DO NOT force plug into motor
and make sure power is off before inserting power connector. DO NOT apply voltage to terminals 1 or 2.
INCLINED
MANOMETER
SUPPLY
RETURN
TOTAL EXTERNAL STATIC
41
SERVICING
If motor does not respond as noted, ECM control unit is
bad and should be replaced.
WARNING
LINE VOLTAGE NOW PRESENT
Check for line voltage on terminals 4 and 5. Verify terminal
3 is ground. Terminals 1 and 2 should be connected only if
motor is operating on 120 Volts.
1
2
3
4
5
}
Lines 1 and 2 will be connected
for 12OVAC Power Connector
applications only
Gnd
OUT -
8
16 OUT +
ADJUST +/-
7
15 G (fan)
Y1
6
14 Y/Y2
COOL
5
13 EM HT/W2
DELAY
4
12 24VAC (R)
COMMON 2
3
11 HEAT
W/W1
2
10 BK/Pwm (Speed)
COMMON 1
1
9
AC Line Connection
AC Line Connection
O (Rev Valve)
POWER CONNECTOR
CONTROL CONNECTOR
"Motor Half"
Control connections
Do not apply 24 volts to terminals "Out +" or "Out-".
Make sure connector is fully seated.
Make Sure Pins are Fully Seated in Connector Housing.
Verify C1 and C2 are connected to transformer common.
Verify "R" is connected to transformer hot.
After verifying above connections, motor can be tested by
applying 24 volts to control pins. Example: R to G will cause
fan to come at "Fan-Only" CFM. R to G to Y will cause fan
to come on at cooling speed.
Power
Conditioning
HVAC System Control
INPUTS
24 Volts A/C
Compressor
On/Hi/Low
Fan On
Reversing Valve
Aux./Emergency Heat
Capacity Select
AC to DC
Conversion
"Motor Half“
CAUTION
High Voltage on Control Pins will Destroy Motor
Replacing ICM Control Module
Use the following steps to replace the control module for
the GE© variable speed indoor blower motor.
Inverter
Motor
Control
Outputs
CFM Demand
ICM/ECM CONTROL FLOW CHART
42
ECM
Blower
Motor
SERVICING
1. You must have the correct replacement module. The
controls are factory programmed for specific operating
modes. Even though they look alike, different modules
may have completely different functionality. Using the
wrong control module voids all product warranties and
may produce unexpected results.
2. Remove all power from the unit being serviced. Do not
work on the motor with power applied. Wait at least 5
minutes after disconnecting power from the equipment
before opening the motor.
3. It is usually not necessary to remove the motor from the
blower assembly. However it is recommended that the
whole blower assembly, with the motor, be removed.
Unplug the two cable connectors to the motor. There
are latches on each connector. Do not pull on the wires.
The plugs remove easily when properly released.
4. Observe the flat end of the motor control module casting
and located the two standard ¼" hex head bolts. Remove these bolts from the motor while holding the control module. Do not remove the two torx head screws.
5. The control module is now free of the motor but still attacked by a plug and cable. Carefully rotate the control
so as to gain access to the plug on the end of the cable.
Squeeze the release latch and gently pull the plug out
of the control module. Do not pull on the wires. Grip the
plug only.
6. The control module is now completely detached from the
motor. Verify with a standard ohmmeter that the resistance from each motor lead (in the motor plug just removed) to the motor shell is greater than 100k ohms.
(Measure resistance to unpainted motor end plate). If
any motor lead fails this test do not proceed to install
the control module. The motor is defective and must be
replaced. Installing the new control module will cause it
to fail also.
7. Verify that the replacement control module is correct for
your application. If so, orient the new module next to
the motor and carefully insert the plug removed in step
5. Be sure the plug latches. It will click when properly
inserted.
8. Install the new control module back on the motor being
careful to engage the locating pin into the appropriate
mating motor hole. Replace the two 1/4" hex head bolts.
Tighten the bolts snugly. It is not necessary to overtighten.
Note: Before replacing the blower/motor assembly, it is important to look at the installation to see if some application
fault has caused the motor to fail.
10. Plug the 16-pin control plug into the motor. The plug is
keyed. Make sure the connector is properly seated and
latched.
11. Plug the 5 pin power connector into the motor even
though the plug is keyed, observe the proper orientation. Do not force the connector. It plugs in very easily
when properly oriented. Reversing this plug will cause
immediate failure of the control module.
12. Final installation check. Make sure the motor is installed
as follows:
A.
B.
As far into the blower housing as possible
Belly bands not covering vent holes or on the
control module
C. Motor connectors should oriented as to prevent
the accumulation of moisture in the control.
D. Use wire ties to create a drip loop in the motor
cables.
13. The installation is now complete. Reapply power to the
package unit and verify that the new motor control module is working properly.
S-300 TESTING PRIMARY LIMIT CONTROL
Amana Package Gas Units use a snap-disk type primary
limit device. Sometimes referred to as "stat on a stick". The
limit setting is fixed and must not be readjusted in the field.
THERMODISC (TOD) LIMIT CONTROL
Refer to the specification section to determine the proper
limit cutout temperature for the model being serviced.
In all instances the limit control is wired in series with the
ignition control.
If the temperature within the furnace should exceed this
setting, the control will open, de-energizing the ignition control which in turn will open the electrical circuit to the gas
valve.
The control will automatically reset when the temperature
within the combustion chamber is sufficiently lowered.
WARNING
Is there any evidence of water damage to the failed control? (Corrosion on the inside or outside of the casting.) If
yes, do moisture check.
Disconnect Electrical Power Supply:
9. Re-install the blower/motor assembly into the package
unit.
2. Remove the wires from the limit control terminals.
1. Remove electrical power to unit. Some units may have
more than one source of power.
3. Using an ohmmeter, test for continuity across the two
terminals.
43
SERVICING
4. If limit test open allow unit to cool and retest.
S-302 CHECKING FLAME ROLLOUT SWITCH
5. If still open, replace the control.
Package Gas Units with serial numbers beginning 9001 and
later use a temperature activated manual reset control
mounted to the manifold assembly.
S-301 TESTING AUXILIARY LIMIT
CONTROL This control is preset nonadjustable control
mounted in the blower compartment area.
It is connected in series with the limit control wiring to the
ignition control. If its temperature should be exceeded, it
will open, interrupting the voltage to the gas valve causing
it to open.
An additional limit (primary limit) control is required for safety
control of high temperature within the furnace or duct work.
AUX. LIMIT
This control is wired in series with the primary limit and integrated control. The control is designed to open should a
flame roll out occur. An over firing condition or flame impingement on the heat shield may also cause the control to
open.
If the rollout control has opened, the circuit between the
ignition control and gas valve will be interrupted and the
ignition control module will go into lockout. The servicer
should reset the ignition control by opening and closing the
thermostat circuit. The servicer should look for the ignitor
glowing which indicates there is power to the ignition control. The servicer should measure the voltage between each
side of the rollout control and ground while the ignition control is try to power the gas valve.
Limit Switch Operation (Applies to Primary, Auxiliary, and
Roll Out Limits) DSI systems.
If a limit switch opens, the indoor blower is energized on
heat speed and the induced draft blower is energized. The
LED on the control flashes "4" to indicate an open limit
switch. The blower and inducer remain on while the limit
switch is open. The gas valve is de-energized. Power to
the thermostat "R" is removed while the limit switch is open.
When the limit switch re-closes, the induced draft motor
runs through its post purge and the indoor blower goes
through the heat off delay.
If a call for heat exists when the limit switch re-closes, the
control goes through a pre-purge period and then makes
an ignition attempt. The indoor blower remains on (for the
delay off time) during the re-ignition attempt.
WARNING
Disconnect Electrical Power Supply:
1. Remove the wires from the auxiliary limit control terminals.
2. Using an ohmmeter, test for continuity across the two
terminals. No reading indicates the control is open.
Push the red reset button, test again - if still open, replace the control.
a. If no voltage is measured on either side of control it
indicates ignition control or wiring to control problem.
b. If voltage is measured on one side of the control and
not the other, it indicates the control is open.
c. If voltage is measured on both sides of the control the
wiring to gas valve or valve is at fault.
Servicing procedure with furnace not firing.
1. Confirm that the outer door was in place and all screws
tightened. (No leaks under the door.)
2. Check to see if any damage was done to the furnace
especially the wiring.
OHMMETER
3. Confirm that heat exchanger is not obstructed by feeling for discharge air from the flue hood when the combustion blower is running but the unit is not firing.
If the above steps do not suggest the reason the control
has tripped the furnace should be fired.
1. Remove the heating compartment door.
LIMIT OR AUXILIARY LIMIT CONTROL
44
2. Turn of the power or open the thermostat circuit.
SERVICING
3. Reset the roll-out control.
4. Turn power on and put the unit into a call for heating.
5. The control checks the signal from the flame sensor. Gas
flow will continue only if a proper signal is present. As
soon as pilot flame is proven, the ignitor is de-energized.
6. The unit will continue to fire for 30 seconds. The fan control will then start the main circulating air blower.
CAUTION
Assume flame roll-out could occur. Keep face and
hands a safe distance from burner area.
7. The unit will deliver heat to the conditioned space until
the thermostat is satisfied.
5.
Look under the heat shield as the unit is running.
Flames should be drawn into firing tubes.
8. The gas valve and combustion blower will be de-energized when the thermostat opens.
A.
If only one burners flame is not drawn into the
tube, that tube is restricted.
B.
If with out the air circulation blower running, all
flames are not drawn into the tubes either the
collector box, combustion blower, or flue outlet is
obstructed. If the combustion blower or flue outlet is obstructed, the pressure switch should have
opened preventing the unit from firing, also inspect the unit pressure switch and wiring.
9. There is an adjustable Heat Fan OFF of approximately
60/90/120/150 second delay (factory set at 120). The
control module (figure 6) will de-energize the blower
once the selected time has elapsed. This allows any
additional heat in the heat exchanger to be transferred
to the conditioned space.
C.
If the burner flame is not drawn into the tube only
when the air circulation blower is running, then a
cracked heat exchanger tube is present.
S-304 TESTING GAS VALVE
Smart Valve Systems
Amana package units utilize Honeywell "Smart Valve" gas
valves which provides all manual and automatic control functions required for gas fired heating equipment.
UNUSED
1
3
S
1
S
MOTOR
LEADS
2
3
C
4
NEUTRAL
C
O
O
L
2
S
X
XFMR SEC
H
E
A
T
RESET AFTER CONTROL LOCKOUT
Amana PGA__C, PGB__C and PGD__C units built prior to
July, 1999, are equipped with the Honeywell "Smart Valve"
system. If the control senses a loss of flame, the control will
automatically attempt to relight. A lockout occurs only when
the ignitor fails, roll-out switch, primary limit or secondary
limit opens. This causes the air circulation blower to run
continuously, and ignition is no longer attempted. When
this occurs, it may be necessary to reset the control by turning the thermostat setting below room temperature for several seconds and then returning the setting to the desired
temperature. The roll-out and secondary limit are manual
reset switches and require resetting before normal operation can continue. A failed ignitor will require replacement.
The control may also be reset after a lockout by turning off
the electrical disconnect switch to the furnace for several
seconds.
IMPORTANT: If the furnace frequently has to be reset, it
means that a problem exists that should be corrected.
WARNING
Disconnect Electrical Power Supply:
1. Remove wire connections from gas valve terminals.
C G Y W R
90
OFF
150
HEAT FAN 120
DELAY
C
Y
60
SMART VALVE FAN TIMER BOARD
NORMAL SEQUENCE OF OPERATION
1. Thermostat calls for heat. The combustion blower is immediately energized.
2. The pressure switch contacts transfer.
2. Using an ohmmeter, test across the ignitor terminals,
(Terminals 1 & 2 on the Q3450 harness)
3. Should read continuity, if not replace ignitor.
4. Using an ohmmeter, test from flame sensor to ground
on the Q3450 harness.
6. If continuity is shown, replace pilot assembly.
7. Reconnect harness(es) to gas valve.
8. Restore power to unit.
3. The ignitor is energized and pilot gas begins to flow.
4. After pilot flame is proven, the main valve is energized
and the pilot will light the main burners.
WARNING
Voltage Now Present
9. Set thermostat to demand for heat.
45
SERVICING
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
PRESSURE REGULATOR
ADJUSTMENT (UNDER
CAP SCREW)
10. Ignitor warn up is 5 Seconds. Amp draw to ignitor is 1
to 1.5 amps at 24 VAC. Use an Amprobe to verify current.
11. Using a microamp meter verify flame sense. Microamp
readings should be 0.3 microamps or greater.
2
ON
OFF
IN
CONT ROL
IGNITOR
A-A
PSI
OUTLET PRESSURE TAP
1/8 N.P.T., PLUGGED
(STEEL)
MATES WITH
SOCKET HOUSING
CONTROL MODULE
MATES WITH
HONEYWELL
Q3450* PILOT
HARNESS
12. Smart Valve will not allow main burner operation until
pilot is proven. NOTE: pilot positioning will affect pilot
operation and flame sensing characteristics. See S314 for proper pilot positioning.
13. If pilot looses flame sense, valve will shut off main burners and attempt relight. The "Smart Valve" system will
not lock out from no flame sense, it will continue to attempt relight.
Direct Spark Ignition (DSI) Systems
A combination redundant operator type gas valve which
provides all manual and automatic control functions required
for gas fired heating equipment is used.
The valve provides control of main burner gas flow, pressure regulation, and 100 percent safety shut-off.
WARNING
Disconnect Electrical Power Supply:
VIEW A-A
1. Remove wire connections from gas valve terminals.
HONEYWELL MODEL SV9500
2. Using an ohmmeter, test across the gas valve coil terminals, both the redundant and the main valve.
IN
ON
1/2PSI
Gas Valve
On/Off
Selector
Switch
INLET
M
O
F
F
1
P
3
C
2
OUTLET
OFF
ON
MATES WITH
HONEYWELL
Q3450* PILOT MATES WITH
HARNESS
SOCKET HOUSING
MOLEX 39-01-0240
TO CONTROL
Inlet Pressure Tap
(Side of Valve)
Pressure Regulator
Adjustment
(Under Cap Screw)
Outlet (Manifold)
Pressure Tap
(Side of Valve)
WHITE ROGERS MODEL 36E GAS VALVE
HONEYWELL
IGNITER
CONTROL
3. Should read approximately 130 Ohms for the Robertshaw main valve operator coils. The redundant coil will
vary somewhat as well.
4. Reverse leads. Some redundant coils have (dividers)
diodes.
If not as above, replace the entire valve.
S-305 CHECKING MAIN BURNERS
The main burners are used to provide complete combustion of various fuels in a limited space, and transfer this
heat of the burning process to the heat exchanger.
HONEYWELL MODEL SV9501
46
SERVICING
Proper ignition, combustion, and extinction are primarily due
to burner design, orifice sizing, gas pressure, primary and
secondary air, vent and proper seating of burners.
Orifices should be treated with care in order to prevent damage. They should be removed and installed with a box-end
wrench in order to prevent distortion. In no instance should
an orifice be peened over and redrilled. This will change
the angle or deflection of the vacuum effect or entraining of
primary air, which will make it difficult to adjust the flame
properly. This same problem can occur if an orifice spud of
a different length is substituted.
WARNING
Disconnect Gas and Electrical Power Supply:
1. Check orifice visually for distortion and/or burrs.
2. Check orifice size with orifice sizing drills.
BECKETT BURNER
WARNING
3. If resizing is required, a new orifice of the same physical size and angle with proper drill size opening should
be installed.
Disconnect Gas and Electrical Power Supply:
S-307 CHECKING GAS PRESSURE
In checking main burners, look for signs of rust, oversized
and undersized carry-over ports restricted with foreign material, etc .
Gas inlet and manifold pressures should be checked and
adjusted in accordance to the type of fuel being consumed.
WARNING
S-306 CHECKING ORIFICES
A predetermined fixed gas orifice is used in all of these
furnaces. That is an orifice which has a fixed bore and
position.
A
Disconnect Gas and Electrical Power Supply:
1. Connect a water manometer or adequate gauge upstream of the gas valve. (If no provisions are provided,
we suggest removing cap from dripleg and install a predrilled cap with hose fitting as shown below.)
Gas Line
Gas Shutoff Valve
GAS
STREAM B
Gas Line
To Furnace
DENT OR
BURR
GAS
STREAM B
Open To
Atmospere
Drip Leg Cap
With Fitting
Manometer Hose
The length of Dimension "A" determines the angle of Gas
Stream Defraction,"B".
A dent or burr will cause severe deflection of gas stream.
No resizing should be attempted until all factors are taken
into consideration such as inlet manifold gas pressure, alignment, and positioning, specific gravity and BTU content of
the gas being consumed.
The only time resizing is required is when a reduction in
firing rate is required for an increase in altitude.
Manometer
MEASURING INLET GAS PRESSURE
2. Remove the pressure tap fitting at the manifold if provided or from the gas valve and install fitting to connect
another manometer or gauge.
47
SERVICING
Gas Valve Control
ON/Off Switch
INLET
Open to
Atmosphere
WR
O
F
F
M
1
P
3
C
2
ON
Inlet Pressure Tap
(Side of Valve)
Manometer Hose
OUTLET
Outlet (Manifold)Pressure Tap
(Side of Valve)
Pressure Regulator Adjustment
(Under Cap Screw)
Manometer
MEASURING MANIFOLD GAS PRESSURE
With Power ON:
WARNING
LINE VOLTAGE NOW PRESENT.
3. Put furnace into heating cycle and turn on all other gas
consuming appliances.
For NATURAL GAS:
a.
Inlet pressure should be a nominal 7" w.c.
b.
Manifold pressure should be 3.5 ± .3"w.c.
(Canadian - Sea Level 4.2" ± .3" w.c.)
For PROPANE GAS:
a.
Inlet pressure should be a nominal 11" w.c.
b.
Manifold pressure should be a nominal 10" w.c.
If operating pressures differ from above, make necessary
pressure regulator adjustments, check piping size, etc., and/
or consult with local utility.
S-308 CHECKING FOR DELAYED IGNITION
Delayed ignition is a delay in lighting a combustible mixture
of gas and air which has accumulated in the combustion
chamber.
When the mixture does ignite, it may explode and/or rollout
causing burning in the burner venturi.
If delayed ignition should occur, the following should be
checked:
1. Improper gas pressure - adjust to proper pressure. (See
S-307)
2. Improper burner positioning - burners should be in locating slots, level front to rear and left to right.
3. Carry over (lighter tube or cross lighter) obstructed clean.
4. Main burner orifice(s) deformed, or out of alignment to
burner - replace.
S-309 CHECKING FOR FLASHBACK
Flashback will also cause burning in the burner venturi, but
is caused by the burning speed being greater than the gasair flow velocity coming from a burner port.
48
Flashback may occur at the moment of ignition, after a
burner heats up or when the burner turns off. The latter is
known as extinction pop.
Since the end results of flashback and delayed ignition can
be the same (burning in the burner venturi) a definite attempt should be made to determine which has occurred.
If flashback should occur, check for the following:
1. Improper gas pressure - adjust to proper pressure. See
S-307.
2. Check burner for proper alignment and/or replace
burner.
3. Improper orifice size - check orifice for obstruction.
S-310 CHECKING PRESSURE CONTROL
A pressure control device is used to measure negative pressure at the induced draft blower motor inlet to detect a partial or blocked flue.
Pressure Switch Operation (Honeywell Smart Valve
System)
The pressure switch is ignored unless there is a call for
heat. When the control receives a call for heat, power for
the smart valve is routed through the pressure switch (wires
VT-18 - YL-11). The valve is not energized until the pressure switch is closed. If at any time the pressures opens
power to the gas valve is removed. The inducer motor will
continue to run as long as there is a call for heat at the
thermostat.
Pressure Switch Operation (DSI Direct Spark System)
The pressure switch is ignored unless there is a call for
heat. When the control receives a call for heat, the control
checks to see that the pressure switch is open. If the control sees that the pressure switch is closed before the induced draft blower is energized, the LED will flash a code
of "3" (to indicate the pressure switch is stuck closed) and
the inducer will remain off until the pressure switch opens.
If the pressure switch opens before the ignition period, the
induced draft blower will remain on and the control will stay
in pre-purge until the pressure switch is closed for an entire
15 second pre-purge period. The LED will flash a code of
"2" to indicate open pressure switch.
If the pressure switch opens after the gas valve has been
energized, the control will de-energize the gas valve and
run the indoor blower through the heat off delay. The inducer stays on until the pressure switch re-closes. Then
the control makes another ignition attempt.
WARNING
Disconnect Electrical Power Supply:
1. Remove wires from the electrical terminals.
2. Using a VOM check from Common to NO (Normally
Open) - should read open.
SERVICING
If switch reads as noted proceed to Step 3, otherwise replace control.
3. Remove the pressure control hose from the control and
interconnect with an inclined manometer as shown:
HOSE
TO J-TUBE
S-312 CHECKING HOT SURFACE IGNITER
"Smart Valve" systems use a silicone carbide restrictive element ignitor is used for ignition. The normal operating temperature is approximately 2550°F. "DSI" systems use a
spark type igniter.
WARNING
1/4" COPPER TEE
Disconnect Electrical Power Supply:
PRESSURE SWITCH
1. Ignitor cool - approximately 70 - 75°F.
2. Disconnect the ignitor from the Ignition Control Module
and line voltage terminal board.
INCLINED
MANOMETER
Reconnect wires VT-18 to Common and YL-11 to NO terminals.
With Power ON:
WARNING
3. Using an ohmmeter measure the resistance of the ignitor it should read between 16 to 24 ohms for Norton
mini ignitors. DSI system do not use hot surface ignitors.
4. Reconnect igniter.
With Power ON:
LINE VOLTAGE NOW PRESENT.
4. Energize furnace for heating cycle. The induced draft
blower motor will begin to run. The inclined manometer
should read approximately 1.35" W.C. negative on small
cabinets units and approximately 3.50" W.C. negative
on large cabinets with no combustion. Refer to the Product Design section for pressure tap location.
VOLTAGE NOW PRESENT.
5. Remove and check the two electrical wires and using
the VOM check from Common to NO (Normally Open),
it should read closed (with I.D. motor running). If not as
above, replace control.
S-313 TESTING IGNITION CONTROL MODULE
6. Reconnect all wires to the control and place in heating
cycle.
7. As the unit fires, the inclined manometer negative pressure will drop to -.90" W.C. for the small cabinets and 1.90" W.C. for the large cabinets.
WARNING
5. Place unit in heating cycle, measure current draw of
ignitor during preheat cycle. Should read approximately
1 to 1.5 amps.
NOTE: Failure to earth ground the unit, reversing the neutral and hot wire connection to the line (polarity), or a high
resistance connection in the ground or neutral lines may
cause the control to lockout due to failure to flame sense.
WARNING
8. Begin to restrict the flue outlet until the pressure control
trips, cycling OFF the burner. The control will trip at
approximately 0.36" W.C.negative.
To avoid the risk of electrical shock, wiring to the unit
must be properly polarized and grounded. Disconnect
power before performing service.
9. If not as listed, replace control.
The ground wire must run from the furnace all the way back
to the electrical panel. Proper grounding can be confirmed
by disconnecting the electrical power and measuring resistance between the neutral (white) connection and the burner
closest to the flame sensor. Resistance should be less
than 10 ohms.
Note: the pressure switch must be mounted with the diaphragm in a vertical position.
S-311 HIGH ALTITUDE APPLICATION
Package units covered by this manual are approved for
use to 6,000 ft. in the USA. Canada (CSA) certified units
are approved for use to 4,500 ft. High altitude kits provide
for operation to 11,000 ft. in the USA. High altitude kits are
not approved for use in Canada. It is not necessary to
change the pressure switch for high altitude operation.
GAS
NATURAL
L. P. GAS
Kit
Number
HANG07
HALP09
Altitude
(Feet)
6001 - 11000
6001 - 11000
Honeywell Smart Valve Ignition Systems
NORMAL SEQUENCE OF OPERATION (Honeywell
Smart Valve System)
Orifice
# 45
# 56
49
SERVICING
Honeywell Smart Valve Sequence of Operation
SV9500
Start
Power to System
Board checks limit circuit
Limit(s) open
Limits closed
Control board applies power to
Air circulating blower (ACB)
cooling speed. Pilot and Igniter
are locked out.
Thermostat calls for heat
Self Check
"Smart Valve" checks Igniter
circuit and valve
Ignition
Igniter
Missing
or Broken
System shuts down..
Igniter and gas
valve check OK
"Smart Valve" powers Igniter,
opens pilot valve.
Pilot Lights, Flame Rod
Senses Flame
No
Igniter stays on
Pilot valve remains
open
Flame outage
occurs during
run cycle
Main valve closes
Yes
Main
Burner
Operation
Igniter Off
Main Valve Opens
Main burner Lights
Smart Valve sends signal
(24V) to control board.
Igniter
opens
Control board times out,
applies power to blower
(ACB) heating speed.
End
Thermostat Ends "Call
for Heat"
Main and Pilot Valves Close
Control board times out.
De-energizes power to
blower (ACB)
50
Pilot and main valves
close.
System shuts down.
SERVICING
Honeywell Smart Valve Sequence of Operation
SV9501
Start
Power to System
Control board applies power to
Air circulating blower (ACB)
cooling speed. Pilot and Igniter
are locked out.
Limit(s)
open
Board checks limit circuit
Limits closed
Five minute retry delay
Thermostat calls for heat
Self Check
Flame signal detected
Yes
No
Pilot valve and Igniter remain
closed. Valve waits for flame
signal to disappear
"Smart Valve" internal check
(valve and igniter) OK?
Trial
For
Ignition
No
Three second flame
Failure recycle delay
Yes
"Smart Valve" powers Igniter,
opens pilot valve.
Pilot Lights, Valve Senses Flame
Yes
Main
Burner
Operation
Igniter Off Main Valve Opens
Main burner Lights Smart Valve
sends signal (24V) to control
board.
No
Pilot valve closes,
Igniter off.
Control board times out, applies
power to blower (ACB) heating
speed.
Flame signal lost
No
90 Second trial for ignition.
Ignter and pilot open, after
30 seconds igniter cycles off
pilot stays on. After 30
Seconds (60 from start),
igniter will cycle on for 30
seconds.
Igniter
opens
Yes
Pilot and main valves close.
EFT (Electronic Fan Timer)
output de-energizes.
Thermostat Ends "Call for Heat"
End
Main and Pilot Valves Close
Control board times out.
De-energizes power to blower
(ACB)
No
Flame signal lost more
than 5 times in one call
for heat
Yes
51
Start
Check
PROCEDURE
Turn gas supply off.
Set thermostat to call
for heat.
Check line voltage
Measure voltage @ L1, L2, & GR.
NO
Correct line voltage
Check Voltage @ transformer
Measure voltage @ Control board GY-25
& R-1
NO
Correct low voltage
Check thermostat & wiring
Measure voltage @ Control board
terminals "W" to C 19.5 Min. 27.5 Max.
NO
Repair/replace
thermostat/thermostat
wiring
Check primary, Aux. & roll out limits
Measure voltage @ Control board molex
plug "OR-49 to BR-21. Must read 0 volts
NO
Reset or replace limit
NO
Smart Valve is
powered. (24volt
nominal- 19.5 volts
minimum. 27.5 Max.
Replace control board
Check Voltage @ Red & Violet Wires to
ID blower @ Control Board(230 volts)
YES
Igniter warms up and
glows red.
ACTION
Check induced draft blower operation
NO
Check pressure switch operation
Check gas valve
NO
YES
Replace I.D. Blower
Check Voltage @ Yel.-11 at Smart valve
(19.5 volts min. 27.5 Max.)
NO
Repair wiring or replace pressure switch
Unplug pilot burner cable
Measure voltage at Terminals 1&2 on
Smart Valve. (19.5 Minimum 27.5 Max.)
NO
Replace Smart Valve
Check igniter continuity with Ohm meter
NO
Replace Igniter/Flame
sensor assembly
Check ingiter
YES
Check pilot to burner alignment.
Turn gas on.
Pilot burner lights
NO
Check pilot assembly
Check gas valve
YES
Verify that pilot is positioned in front of the NO
burner carry-over
Verify that pilot orifice is free of
obstructions and corectly sized for gas
d
d
Verify that pilot adjustment on gas valve
open and adjusted correctly
Correct pilot position
NO
Clear obstruction or
replace pilot orifice
NO
Open or adjust gas
valve pilot
SERVICING
52
SMART VALVE DIAGNOSTIC / TROUBLE SHOOTING CHART
NO
Verify that pilot is positioned in front of the
burner carry-over
NO
Correct pilot position
Check gas valve
Verify that pilot adjustment on gas valve
open and adjusted correctly
NO
Open or adjust gas
valve pilot
Check flame proving circuits and gas
valve
Verify unit is properly grounded?
NO
correct unit grounding
NO
Repair or clean pilot
mounting or
transformer grounding.
NO
Replace Smart Valve.
Reuse ignitor/flame
sensor assembly
NO
Repair/Replace
harness or gas valve.
YES
Verify flames sense circuit. Remove
power to unit and measure ohms from
pilot hood to tramsformer common. 10
ohms max.
YES
YES
Replace Igniter/flame sensor assembly
and restart trouble shooting sequence
Does main burner light?
YES
Discard old Igniter/flame sensor Assembly
Blower runs after 30
Seconds
YES
NO
Check control board
Check for output from gas valve to control
board. 19.5 volts min. at Blue 34 wire to
transformer common.
YES
Replace control board
Smart Valve system
OK
SERVICING
Main valve opens
Check pilot to burner alignment.
53
SERVICING
Testing Honeywell Smart Valve Systems
The ignition control module is a combination electronic and
electromechanical device and is not field repairable. Complete unit must be replaced.
With Power ON:
3. The control energizes the spark igniter and gas valve
for 7 seconds. If flame is established, the control goes
into a 30 second heat on delay.
4. The indoor blower is energized at the heat speed after
a 30 second on delay.
5. The control monitors the safety circuit inputs, flame, and
thermostat during operation.
WARNING
LINE VOLTAGE NOW PRESENT.
Furnace thermostat calling for heat (4 to 5 second preheat
time).
1. Check for 230 volts from L1 terminal of control module
to L2. No voltage - check wire connections, continuity,
etc.
2. Check for 24 volts at C" or X terminals on control board.
3. Voltage Present - check for voltage (24 VAC) between
terminals 1 & 3 on gas valve (R-29 & GY-30). No voltage - replace Control board.
6. When the thermostat is satisfied, the gas valve is deenergized and the induced draft blower remains on for
a 29 second post purge. The indoor blower remains on
for the selected heat blower off delay (90, 120, or 150
seconds). Indoor blower off timing begins when thermostat call for heat ends.
Testing Direct Spark Ignition (DSI) systems
Furnace thermostat calling for heat (15 second prepurge
time and 7 second trial for ignition).
Note: Voltage to ignitor should read 24 volts.
1. Check for 230 volts from L1 terminal of control module
to L2. No voltage - check wire connections, continuity,
etc.
4. Main burner will light only after pilot has proved flame.
30 seconds after main burner lights check for voltage
between "heat" terminal and "neutral terminals" on
board. No voltage - replace Control board.
2. Check for 24 volts at "R to C" thermostat terminals. No
voltage - check 3 amp automotive type fuse on control
board. A blow fuse would indicate a short in the 24 volt
circuit (thermostat or limit circuit).
DSI Direct Spark Ignition Systems
3. Voltage Present - check for voltage (24 VAC) between
terminals 1 & 3 on gas valve (R-29 & GY-30). No voltage - replace Control board.
NORMAL SEQUENCE OF OPERATION (DSI Direct
Spark Ignition System)
1. Thermostat calls for heat by energizing "W". The control checks the pressure switch for open condition. If
the pressure switch is closed the control will flash code
"3" and wait for the pressure switch to open.
2. The induced draft motor is energized and the control
flashes code "2" and waits for the pressure switch to
close. Once the pressure switch is closed, the LED stops
flashing and the control begins timing the 15 second
pre-purge.
Blower Off Delay Settings
L2
COOL
HEAT
L2
L2
L2
UNUSED
L1
L1
D1
1
3
2
6
5
4
9
8
7
12
11
10
speed up
FS
Diagnostic LED
Transformer
DSI Control Board
54
Diagnostics Flash Codes
LED Steady On
Control is OK in standby, heat, cool, or
fan only modes.
LED Steady Off
Internal control fault or no power.
1 Flash
Lockout due to failed ignition or flame
dropouts.
2 Flashes
Pressure switch is open with induced
draft motor energized.
3 Flashes
Pressure switch is stuck closed with induced draft motor de-energized.
4 Flashes
Limit switch is open (primary, auxiliary,
or roll out).
5 Flashes
Flame detected with gas valve closed.
6 Flashes
Compressor output delayed from short
cycle timer.
7 Flashes
Low flame sense current. Control will
flash 7-times while continuing normal
operation.
8 Flashes
Lock out due to five consecutive limit
trips within a single call for heat. Resets
in 1/2 hour.
NOTE: The flash rate is 0.25 seconds on, 0.25 seconds
off, with a 2 second pause between codes.
SERVICING
S-314 CHECKING FLAME SENSOR
A flame sensing device is used in conjunction with the ignition control module to prove combustion. If a microamp
signal is not present the control will de-energize the gas
valve and "retry" for ignition or lockout.
The drawing right illustrates, the approximate distances for
the pilot assembly to the gas inshot burner. You will note
they are not in the main burner stream, but along the carry
over ports.
NOTE: Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense
signal. If this situation occurs the flame sensor must be
cleaned with emery cloth or steel wool. Do not use sand
paper, the silicone in sand paper will further contaminate
the sensor.
Honeywell Smart Valve Systems
WARNING
Disconnect Electrical Power Supply:
1. The Honeywell "Flame Sense Measurement Kit", Amana
part # R9900026, is required to correctly measure the
microamp flame proving current.
CORRECT
POSITION
2. Connect the Honeywell "Flame Sense Measurement
Kit", Amana part # R9900026, as instructed in the kit
instructions.
With Power ON:
WARNING
LINE VOLTAGE NOW PRESENT.
3. Place the unit into a heating cycle.
4. As soon as flame is established a microamp reading
should be evident once proof of flame (microamp reading) is established, the hot surface ignitor will be deenergized.
5. The minimum microamp reading is 0.12 microamps for
SV9500 valves and 1.40 microamps for SV9501 valves.
If the microamp reading is less than the minimum specified, check for high resistance wiring connections, the
distance between the sensor and burner, flame sensor
connections or poor grounding.
"A"
DIMENTION
"A" CANNOT
EXCEED 1/4"
6. If no reading, check for continuity on all components
and if good - replace ignition control module.
Burner Assembly
55
SERVICING
DSI Direct Spark Ignition Systems
WARNING
Disconnect Electrical Power Supply:
1. Disconnect the flame sensor wire from terminal FS of
the ignition control module.
2. Connect a microamp meter in series with this wire and
terminal FS.
3. Be sure the negative side of the meter is to the wire and
the positive of the meter is to terminal FS.
With Power ON:
WARNING
LINE VOLTAGE NOW PRESENT.
4. Place the unit into a heating cycle.
5. As soon as flame is established a microamp reading
should be evident once proof of flame (microamp reading) is established, the hot surface ignitor will be deenergized.
6. The nominal microamp reading is 4 microamps.
7. If the microamp current is less than 1 microamp, the
ignition control will flash a code of 7 flashes. If the
microamp current is less than 0.4 microamps, the control will lockout and flash a code of 1 flash after attempting to restablish flame sense.
8. If the microamp reading is less than the minimum specified, check for high resistance wiring connections, the
distance (3/16") between the sensor and burner, flame
sensor connections or poor grounding.
9. If no reading, check for continuity on all components
and if good - replace ignition control module.
NOTE: Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense
signal. If this situation occurs the flame sensor must be
cleaned with emery cloth or steel wool. Do not use sand
paper, the silicone in sand paper will further contaminate
the sensor.
Spark
Igniter
Flame Sensor
56
WIRING DIAGRAMS
E
2
W2
5
C
ATK
OFF
W
AUTO
19 - 21
R
SEQ 1
O
DF
W
DT
COOL
6
Y
Y
7
AUTO
8
ON
G
G
9
R
R
C
C
PS1
B
DEFROST
CONTROL
12
PS
B
PS2
COOLING
RELAY
A
28
34
30
TEST
PHB/PHD using ATK to control
2nd stage (3rd,4th bank) of
electric heat.
11
Pressure Switches not
used on all models.
A
G
10
23, 24
Y
O
HEAT
RS
OUT
G
SEQ 2
W1
HEATER
4
R
W2
O
3
FUSE
O
1
60
90
CC
Y
COM
FAN
33
13
14
16
17
18
208
SEQ 1
20
28
OL
SEQ 1
HE 1
SEQ 1
HE 2
23
SEQ 2
HE 3
24
SEQ 2
CB
HE 4
21
OL
22
OL
OL
CB
CB
CB
25
208/230-60-1
26
27
ACB
28
COOLING
RELAY
ELECTRIC
HEAT
RELAY
29
30
10
19
CAP
Hard Start components not used on all models.
START RELAY
31
START CAP
32
1
5
2
C
FAN MOTOR
R
S
12
COMP
33
CC
34
35
HI
MED HI
M LO
LO
Fan Relay
on PC Board
CB
RUN CAP
T1
CB
36
208/230-60-1
L2
L1
! WARNING
19
ELECTRIC
HEAT
RELAY
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
15
PHB/PHD with ATK Controling Output to 2nd Stage of Heater
57
WIRING DIAGRAMS
E
2
W2
5
OFF
O
HEAT
19 - 21
R
SEQ 1
O
DF
W
DT
COOL
6
Y
Y
7
AUTO
8
ON
G
G
9
R
R
C
C
PS1
B
DEFROST
CONTROL
PS
B
PS2
COOLING
RELAY
A
28
34
30
TEST
PHB/PHD using ATK to control
"W2" thermostat input.
11
Pressure Switches not
used on all models.
A
G
10
23, 24
Y
W
AUTO
RS
OUT
G
SEQ 2
W1
ATK
HEATER
4
R
C
W2
O
3
FUSE
O
1
60
90
12
CC
Y
COM
FAN
33
13
14
16
17
18
208
SEQ 1
20
28
OL
SEQ 1
HE 1
SEQ 1
HE 2
23
SEQ 2
HE 3
24
SEQ 2
CB
HE 4
21
OL
22
OL
OL
CB
CB
CB
25
208/230-60-1
26
27
ACB
28
COOLING
RELAY
ELECTRIC
HEAT
RELAY
29
30
CAP
Hard Start components not used on all models.
START CAP
32
1
5
2
C
FAN MOTOR
R
S
12
COMP
33
CC
34
Fan Relay
on PC Board
CB
RUN CAP
T1
CB
36
208/230-60-1
L2
L1
PHB/PHD with ATK Controling 2nd Stage Thermostat Input
58
10
19
START RELAY
31
35
HI
MED HI
M LO
LO
! WARNING
19
ELECTRIC
HEAT
RELAY
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
15
WIRING DIAGRAMS
O
HEAT
O
19 - 21
R
SEQ 1
O
DF
W
FSK
Y
Y
7
AUTO
8
ON
9
G
G
R
R
C
C
HEATER
6
A
Pressure Switches not
used on all models.
B
DEFROST
CONTROL
B
PS2
A
PS
COOLING
RELAY
28
34
30
TEST
PHB/PHD with FSK controling
"Y" thermostat input.
11
DT
PS1
G
10
23, 24
Y
W
COOL
RS
OUT
G
SEQ 2
W1
OFF
AUTO
5
C
W2
O
4
R
W2
2
3
FUSE
E
1
60
90
12
Y
CC
COM
FAN
33
13
14
16
17
18
208
SEQ 1
20
28
OL
SEQ 1
HE 1
SEQ 1
HE 2
23
SEQ 2
HE 3
24
SEQ 2
CB
HE 4
21
OL
22
OL
OL
CB
CB
CB
25
208/230-60-1
26
27
ACB
28
COOLING
RELAY
ELECTRIC
HEAT
RELAY
29
30
10
19
CAP
Hard Start components not used on all models.
START RELAY
5
START CAP
2
1
31
32
C
FAN MOTOR
R
S
12
COMP
33
CC
34
35
HI
MED HI
M LO
LO
Fan Relay
on PC Board
CB
RUN CAP
T1
CB
36
208/230-60-1
L2
L1
! WARNING
19
ELECTRIC
HEAT
RELAY
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
15
PHB/PHD with Freeze Protection Kit Installed.
59
R
Y
G
C
BR
BR
RD
YL
GY
BU
THERMOSTAT
W
1
8
5
2
9
6
3
RD
4
BU
7
GY
W1
W2
O
0R
5KW
R
Y
G
C
BR
BR
RD
YL
GY
BU
THERMOSTAT
W
1
8
5
2
9
6
3
RD
4
BU
7
GY
W1
O
W2
0R
10KW
THERMOSTAT
R
Y
G
C
BR
BR
RD
YL
GY
BU
1
8
5
2
9
6
3
RD
4
BU
7
GY
W
0R
W1
W2
O
15KW
THERMOSTAT
W
R
Y
G
C
BR
BR
RD
YL
GY
BU
W2
O
1
8
5
2
9
6
3
RD
4
BU
7
GY
W1
0R
20KW
BR
YL
YL
YL
BR
BR
BR
YL
WIRING DIAGRAMS
60
VT
VT
VT
BK
BK
BK
BK
VT
BK
BK
BR
BK
BK
BK
BR
5
RD
5
3
BK
5
1
4
BK
1
4
BK
BU
OL
OL
BU
BK
BK
PHCB05C1
1
RD
PHCB10C1
4
BK
1
4
BK
2
2
4
1
4
BK
BU
OL
CB1
20152201
VT
RD
BK
RD
CB1
20152301
VT
RD
RD
BK
OL
L2
L1
L2
L1
L4
L3
L2
L1
GND
FIELDPRIN
CONNECTIONED B
208/240 VACD BO
1ø
GND
FIELD
CONNECTION
208/240 VAC
1ø
BK
GND
FIELD
CONNNECTION
208/240 VAC
1ø
GND
BK
FIELD
CONNNECTION
208/240 VAC
1ø
RD
CB1
CB2
20152401
RD
BK
VT
RD
BK
OL
BK
FIELD
CONNECTION
208/240 VAC
1ø
GND
GND
RD
L4
L2
L3
OL
CB1
CB2
20152501
BK
RD
BU
VT
RD
BK
BK
PHBC15C1
RD
BK
BU
5
3
BK
5
3
5
BK
FIELD
CONNECTION
208/240 VAC
1ø
RD
1
BK
BK
RD
L1
OL
BK
BK
OL
OL
BULY-7
BK
OL
1
RD
BK
3
1
BR
BK
BK
BK
BR
BK
BK
BR
BK
BK
BK
BR
RD
PHCB20C1
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
! WARNING
USE COPPERCD B
CONDUCTORSCD B
ONLY-75°C MIN
USE COPPERCD B
CONDUCTORSCD B
ONLY-75°C MIN
USE COPPERCD B
CONDUCTORSCD B
ONLY-75°C MIN
USE COPPERCD B
CONDUCTORSCD B
ONLY-75°C MIN