INSTALLATION INSTRUCTIONS 036, 042, 048, 060, &

Litho U.S.A.
©2006
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier
INSTALLATION
INSTRUCTIONS
LGA/LCA/LGC/LCC
036, 042, 048,
060, & 072
(3, 3−1/2, 4, 5, & 6 TON)
L SERIES® PACKAGED UNITS
505,147M
1/2006
Supersedes 505,129M
Table of Contents
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping And Packing List . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Test Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2
3
3
4
4
4
5
5
Factory−Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Operation and Adjustments . . . . . . . . . . . . . . . . . . . .
Cooling Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Operation and Adjustments . . . . . . . . . . . . . . . . . . . .
Humiditrol Start−Up and Operation . . . . . . . . . . . . . . . . . . . . .
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
7
9
16
20
22
23
26
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
LGA SHOWN
01/06
*2P0106*
505,147M
*P505147M*
LGA/LCA/LGC/LCC036−072 Unit Dimensions − Inches (mm)
*Reheat coils are factory−installed in Humiditrol units only.
OPTIONAL OUTDOOR
AIR HOOD (Factory or
Field Installed)
EVAPORATOR
COIL
REHEAT
COIL*
CONDENSER COIL
4-1/2
(114)
4-1/2
(114)
CENTER OF
GRAVITY
CONDENSER
COIL
INTAKE
AIR
BOTTOM
RETURN AIR
OPENING
46-1/2
(1181)
Base
14 (356)
4-1/2
(114)
6-1/8
(156)
CONDENSER
COIL INTAKE
AIR
28
(711)
14
(356)
BOTTOM
SUPPLY AIR
OPENING
28
(711)
4-1/2
(114)
BOTTOM
POWER ENTRY
5 x 8 (127 x 203)
BLOWER
4-1/2 (114)
BLOWER
MOTOR
87-1/2
(2223)
HEAT
EXCHANGER
(Optional electric
heat in LCA/LCC units)
Base
TOP VIEW
TOP VIEW BASE SECTION
OPTIONAL DISCONNECT /
CIRCUIT BREAKER
86
(2184)
*ELECTRICAL INLET
(High Voltage)
HORIZONTAL
SUPPLY AIR OPENING
CONTROL
BOX
FLUE/VENT
OUTLET
33-1/4
(845)
BLOWER
28
(711)
CONDENSER
COIL
36-1/2
(927)
14
(356)
14 (356)
28
(711)
14 (356)
OPTIONAL
*ELECTRICAL INLET 115 VOLT OUTLET
(Low Voltage)
(Factory Installed)
GAS
INLET
COMPRESSOR
COMBUSTION
AIR INTAKE
3-1/4
(83)
FORKLIFT SLOTS
(Front, Back & Blower End)
LIFTING
HOLES
(For Rigging
Both Sides)
*When Factory Installed Disconnect is Not Used.
FRONT VIEW
OPTIONAL ECONOMIZER DAMPERS
Or OUTDOOR AIR DAMPERS
(Factory or Field Installed)
45
(1143)
FILTERS
OUTDOOR
AIR
OPTIONAL GRAVITY
EXHAUST HOOD
(Field Installed)
OPTIONAL GRAVITY
EXHAUST DAMPERS
(Factory or Field
Installed)
REHEAT COIL*
EVAPORATOR COIL
OPTIONAL
OUTDOOR
AIR HOOD
(Factory or
Field Installed)
EXHAUST
AIR
24-3/4
(629)
BACK VIEW
OPTIONAL ECONOMIZER DAMPERS
(Factory or Field Installed)
1/4 (6)
15
(381)
15
(381)
45
(1143)
FILTERS
OPTIONAL OUTDOOR
AIR HOOD
(Factory or Field
Installed)
FLUE/VENT
OUTLET
OUTDOOR
AIR
OPTIONAL POWER
EXHAUST FAN
(Field Installed)
Down−flow
Applications Only
BLOWER
4
(102)
COMBUSTION
AIR INTAKE
EXHAUST
AIR
5-1/8 (130)
CONDENSATE
DRAIN
END VIEW
(Economizer/Outdoor Air Dampers)
FIGURE 1
Page 1
HORIZONTAL
RETURN AIR OPENING
REHEAT COIL*
EVAPORATOR COIL
32-1/4
(819)
31-1/2
(800)
24-1/4
(616)
BLOWER
5-1/8 (130)
CONDENSATE
DRAIN
END VIEW
(Power Exhaust)
LGA/LCA/LGC/LCC036−072 Parts Arrangement
LGA/LGC
CONDENSER FAN
HEAT EXCHANGER
REHEAT COIL
(HUMIDITROL® UNITS ONLY)
EVAPORATOR COIL
FILTERS
ECONOMIZER
(OPTIONAL)
COMPRESSOR
COMBUSTION
AIR INDUCER
CONDENSATE
DRAIN
GAS VALVE
DISCONNECT OR
CIRCUIT BREAKER
(OPTIONAL)
120V GFI OUTLET
(OPTIONAL)
BURNERS
BLOWER
TB1
LCA/LCC
CONDENSER FAN
REHEAT COIL
(HUMIDITROL® UNITS ONLY)
EVAPORATOR COIL
FILTERS
ECONOMIZER
(OPTIONAL)
COMPRESSOR
CONDENSATE
DRAIN
DISCONNECT OR
CIRCUIT BREAKER
(OPTIONAL)
120V GFI OUTLET
(OPTIONAL)
ELECTRIC
HEAT
(OPTIONAL)
BLOWER
TB1
FIGURE 2
Page 2
Shipping and Packing List
WARNING
Package 1 of 1 contains:
1− Assembled unit
IMPORTANT − Humiditrol units require a specific
field−provided and installed humidity sensor.
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
General
These instructions are intended as a general guide and
do not supersede national or local codes in any way.
Authorities having jurisdiction should be consulted before
installation.
In addition to standard heating and cooling,
LGA/LCA036, 048, 060 and LGC/LCC072 Humiditrol®
units provide a dehumidifying mode of operation. Refer to
Reheat Operation section.
The LGA/LCA060H unit is available using R−410A, an
ozone−friendly HFC refrigerant. Refer to the Cooling Start−Up
section for precautions when installing unit.
See figure 1 for unit dimensions, figure 2 for parts
arrangement and figure 3 for service clearances.
SERVICE CLEARANCES
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉ
ÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉ
36"
36"
EVAP.
BLOWER
HEAT
SECTION
COND.
FAN
36"
COMP.
36"
FIGURE 3
Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on the unit.
Follow lighting instructions attached
to unit when putting unit back into
operation and after service or
maintenance.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
Use of this unit as a construction heater or air conditioner
is not recommended during any phase of construction.
Very low return air temperatures, harmful vapors and
operation of the unit with clogged or misplaced filters will
damage the unit.
If this unit has been used for heating or cooling of
buildings or structures under construction, the following
conditions must be met or the warranty will be void:
The vent hood must be installed per these installation
instructions.
A room thermostat must control the unit. The use of
fixed jumpers that will provide continuous heating or
cooling is not allowed.
A pre−filter must be installed at the entry to the return
air duct.
The return air duct must be provided and sealed to
the unit.
Return air temperature range between 55°F (13°C)
and 80°F (27°C) must be maintained.
Air filters must be replaced and pre−filters must be
removed upon construction completion.
The input rate and temperature rise must be set per
the unit rating plate.
The heat exchanger, components, duct system, air
filters and evaporator coil must be thoroughly
cleaned following final construction clean−up.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s and HCFC’s) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration may be levied for non−compliance.
Page 3
The unit operating conditions (including airflow,
cooling operation, ignition, input rate, temperature
rise and venting) must be verified according to these
installation instructions.
Unit Support
A−Roof Mounting with LARMF − Downflow
1− The LARMF roof mounting frame must be installed,
flashed and sealed in accordance with the
instructions provided with the frame.
2− The LARMF roof mounting frame should be square
and level to 1/16" per linear foot (5mm per linear
meter) in any direction.
3− Duct must be attached to the roof mounting frame
and not to the unit: Supply and return plenums must
be installed before setting the unit.
c−Remove horizontal supply air cover from rear heat
section panel. Cut insulation to match horizontal
supply air opening. Use foil tape to secure cut edges
of insulation to supply air opening. Secure horizontal
supply air cover over downflow supply air opening.
Replace rear heat section panel.
4− Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.
NOTE − Securely fasten roof frame to roof per local codes.
Duct Connection
Many types of roof frames can be used to mount the unit,
depending upon different roof structures. Items to keep in
mind when using the building frame or supports are:
All exterior ducts, joints, openings in roof or building walls
must be insulated and weather−proofed with flashing and
sealing compounds in accordance with applicable codes.
Any duct passing through an unconditioned space must
be insulated.
1− The base is fully enclosed and insulated, so an
enclosed frame is not required.
CAUTION
2− The frames or supports must be constructed with
non−combustible materials and should be square and
level to 1/16" per linear foot (5mm per linear meter) in
any direction.
In downflow applications, do not drill or punch
holes in base of unit. Leaking in roof may occur if
unit base is punctured.
B−Roof Mounting With Installer’s Frame − Downflow
3− Frame or supports must be high enough to prevent
any form of moisture from entering unit.
Recommended frame height is 14" (356mm).
4− Duct must be attached to the roof mounting frame
and not to the unit: Supply and return plenums must
be installed before setting the unit.
5− Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.
NOTE−When installing the unit on a combustible surface
for downflow discharge applications, the LARMF roof
mounting frame is required.
Condensate Drains
Remove cap and make drain connection to the 3/4" N.P.T.
drain nipple provided on unit. A trap must be installed
between drain connection and an open vent for proper
condensate removal. See figure 4. It is sometimes
acceptable to drain condensate onto the roof or grade;
however, a tee should be fitted to the trap to direct
condensate downward. The condensate line must be
vented. Check local codes concerning condensate disposal.
Refer to figures 1 and 2 for condensate drain location.
CONDENSATE DRAIN CONNECTION
CAULK AROUND
CONDENSATE COUPLING
C−Horizontal Discharge Applications
1− Specified installation clearances must be maintained
when mounting units. Refer to figure 3.
2− Top of support slab should be at least 4" (102mm)
above the finished grade and located so no run−off
water from higher ground can collect around the unit.
3− Units are shipped in downflow position. Convert to
horizontal discharge as follows:
a−Remove horizontal return air cover and rear heat
section panel.
b−Secure horizontal return air cover over downflow
return air opening.
Page 4
Minimum Pitch
1" (25 mm) per
10’ (3 m) of line
UNIT
OPEN VENT
Á
Á
Á
Á
Á
MOUNTING FRAME
FIGURE 4
Connect Gas Piping
PRESSURE TEST GAS LINE
Before connecting piping, check with gas company or
authorities having jurisdiction for local code
requirements. When installing gas supply piping, length
of run from gas meter must be considered in determining
pipe size for 0.5" w.c. maximum pressure drop. Do not
use supply pipe smaller than unit gas connection. For
natural gas units, operating pressure at the unit gas
connection must be a minimum of 4.5" w.c. and a
maximum of 10.5" w.c. For propane gas units, operating
pressure at the unit gas connection must be a minimum
of 11" w.c. and a maximum of 13.0" w.c.
When making piping connections, a drip leg should be
installed on vertical pipe runs to serve as a trap for
sediment or condensate. A 1/8" N.P.T. plugged tap is
located on gas valve for test gauge connection. Refer to
Heating Start−Up section for tap location. Install a ground
joint union between the gas control manifold and the
main manual shut−off valve. See figure 5.
Compounds used on threaded joints of gas piping shall
be resistant to the action of liquified petroleum gases.
GAS PIPE CONNECTION
GROUND
JOINT UNION
MANUAL MAIN
SHUT−OFF VALVE
UNIT
SUPPORT
(REFER TO
LOCAL
CODES)
MANUAL MAIN
SHUT−OFF VALVE
GAS VALVE
CAP
FIGURE 6
CAUTION
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or othe sources of ignition
to check for gas leaks.
NOTE−Codes may require that manual main shut−off
valve and union (furnished by installer) be installed in
gas line external to unit. Union must be of the ground
joint type.
After all connections have been made, check all piping
connections for gas leaks. Also check existing gas
connections up to the gas valve; loosening may occur
during installation. Use a leak detection solution or other
preferred means. Do not use matches candles or other
sources of ignition to check for gas leaks.
UNIT
DRIP LEG
NOTE−In case emergency shut down is required, turn off
the main manual shut−off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.
GAS PIPING
SUPPORT
High Altitude Derate
FIGURE 5
Pressure Test Gas Piping
When pressure testing gas lines, the gas valve must
be disconnected and isolated. Gas valves can be
damaged if subjected to more than 0.5 psig (14" w.c.).
See figure 6.
If the test pressure is equal to or less than 0.5 psig (14"
w.c.), use the main manual shut−off valve before pressure
testing to isolate the unit from the gas supply system. If
necessary, adjust main gas supply pressure in
accordance with Connect Gas Pipe" section.
Page 5
Units must be derated when installed at altitudes
above 4500 feet (610 m) above sea level. At altitudes
above 4500 feet (610 m), units must be derated to
match the gas manifold pressures shown in table 1.
NOTE-This is the only permissible derate for these units.
TABLE 1
Gas Manifold Pressure−in. w.g. (kPa)
Natural
LP (Propane)
4501−5500 (1372−1676)
3.4 (0.85)
10.2 (2.54)
5501−6500 (1676−1981)
3.3 (0.82)
9.8 (2.44)
6501−7500 (1981−2286)
3.2 (0.80)
9.5 (2.36)
Altitude − ft.
ft (m)
2− Pivot top hood open and secure sides of intake hood
Factory−Installed Options
to top of hood using three sheet metal screws on each
A−Economizer
The A56 EM1 economizer board controls economizer
operation and provides potentiometers to control
minimum damper position and enthalpy control
adjustments. The economizer board is positioned on the
A55 M1 main control board in the unit control box. See the
Integrated Modular Control Guide for economizer
operation and adjustments.
Intake hood parts and supply air filters are shipped in the
filter section. Remove intake hood package from filter
channels. Remove filters from unit and slide into filter
channels. If the filters have a metal frame, remove the
cardboard shipping pad protecting the evaporator coil.
B−Intake Hood
side. See figure 7.
3− Align two holes on intake hood side panel with two
holes on bottom filter bracket. See figure 8. Secure
both sides of bottom filter bracket to hood sides with
sheet metal screws.
4− Secure intake hood sides to unit.
5− Secure top filter bracket to hood top flange as shown
in figure 8. Slide filter into flanges and install spacers
on either side of filter.
HOOD SIDE VIEW
The intake hood top panel is secured to the unit. The
intake hood sides, filters, and three support brackets are
shipped unassembled in the filter compartment.
Assemble hood and install as follows:
1− Remove screws securing side flanges of top hood to
unit. See figure 7.
HOOD TOP SEAL
HOOD TOP
INTAKE HOOD
TOP SEAL
NOTE: CAULK EACH SIDE
OF TOP SEAL (FIELD PROVIDED)
FILTER
TOP FILTER
BRACKET
HOOD TOP
UNIT
ALIGN VERTICAL HOLES ON
BRACKET WITH VERTICAL
HOLES ON SIDE OF HOOD
HOOD TOP
BOTTOM FILTER
BRACKET
HOOD
SIDE
FIGURE 8
FIGURE 7
Page 6
Electrical Connections − Power Supply
Do not apply power or close disconnect switch until
installation is complete. Refer to start−up directions. Refer
closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity and
maximum overcurrent protection.
1− All units are factory wired. For 208V supply,
disconnect the pink wire labeled T1 Line or 240" from
the control transformer. Connect the pink wire to
transformer terminal labelled 208".
Units Without Optional Disconnect
1− The unit is provided with power entry knockouts
through the base and the blower section mullion (see
page 1).
2− Horizontal Power Entry − Remove necessary
electrical knockouts on blower section mullion.
Bottom Power Entry −
Route wires through knockout on power entry cover.
NOTE − It may be necessary to punch larger holes for
power wiring (refer to current NEC/CEC requirements).
3− Install adequate disconnect switch external to unit in
accordance with local or national codes as
applicable.
Units With Factory−Installed GFI
1− Remove necessary electrical knockouts in unit.
2− Make power wiring connections in bottom power
entry box.
On Humiditrol Units, route wires from RH sensor or
remote switch through knockout provided in unit. For
sensor installations, use 22AWG stranded, two twisted
pairs, individually shielded, 100% aluminum shield with
drain wire and Teflon jacket.
IMPORTANT − Unless field thermostat wires are rated for
maximum unit voltage, they must be routed away from
line voltage wiring.
C−Wire Connections
This unit is equipped with a series of integrated modular
control (IMC) boards which control unit function. Refer to
the IMC manual provided with each unit.
The IMC will operate the unit from a thermostat or zone
sensor based on the System Mode selected in ECTO
6.01. The default System Mode (option 0) is the
thermostat mode.
1− Default Thermostat Mode ECTO 6.01 Option 0 −
The IMC will operate two stages of heating and
cooling based on thermostat demands. Install
thermostat assembly in accordance with instructions
provided with thermostat. See figure 9 for field wiring
and and refer to wiring diagrams on unit.
24 VOLT FIELD WIRING IN THERMOSTAT MODE
(IMC in default T’Stat System Mode 6.01 Option 0)
A2 (2 HT / 2CL)
THERMOSTAT
TB1
3− Connect separate 120v wiring to GFCI outlet pigtails
in handybox on front left corner mullion.
Electrical Connections − Control Wiring
A−Thermostat Location
Room thermostat mounts
non−conductive flat surface.
vertically
on
any
Locate thermostat approximately 5 feet (1.5m) above the
floor in an area with good air circulation at average
temperature. Avoid locating the room thermostat where it
might be affected by:
−drafts or dead spots behind doors and in corners
−hot or cold air from ducts
−radiant heat from sun or units
−concealed pipes and chimneys
Remove the jumper when
a Network Control Panel
(NCP) is installed.
Jumper 8 & 9 when
thermostat has no night
setback terminals; unit will
operate in occupied mode.
Note − On electro−me96
chanical thermostats set
anticipator at 0.1 amps.
95
Not all terminals
are provided on all
thermostats.
Install optional A42 phase
monitor and/or S42 overload relay switch.
B−Wire Routing
Route thermostat cable or wires from subbase through
knockout provided in unit. Use 18 AWG wire for all
applications using remotely installed electro−mechanical
and electronic thermostats.
Page 7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
FIGURE 9
IMPORTANT−Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may result in intermittent operation.
2− Zone Sensor Mode ECTO 6.01 Option 1, 2, or 3−
The IMC will operate heating and cooling based on
the IMC internal setpoints and the temperature from
the A2 zone sensor. An optional Network Control
Panel (NCP) can also be used to provide setpoints. A
thermostat or return air sensor can be used as a
back−up mode. Refer to the IMC manual provided
with each unit to change ECTO options. See figure 10
for field wiring.
24 VOLT FIELD WIRING IN ZONE SENSOR MODE
(IMC in Zone Sensor Mode ECTO 6.01 option 1, 2, 3)
D−Humiditrol® Units Only −
Install humidity sensor in accordance with instructions
provided with sensor. A DDC input may be used to
initiate dehumidification instead of a sensor. Make wiring
connections as shown in figure 9 for Thermostat Mode
and figure 10 for Zone Sensor Mode. In addition, connect
either a zone sensor or a dehumidification input as
shown in figure 11.
24 VOLT FIELD WIRING HUMIDITROL UNITS
Connect EITHER an A91 sensor
or a remote digital input to TB1
A91
HUMIDITY
SENSOR
TB1
Connect shield
drain to unit TB1−7
− not RH sensor.
VIN
A2 SENSOR
16
17
TB1
6
GND
7
VOUT
20
ENERGY MANAGEMENT SYSTEM
DEHUMIDIFICATION
SWITCH
FIGURE 10
One wire of the
two pairs is not
connected.
24
Note − Install sensor and make communication wiring
connections as shown in literature provided with sensor.
Page 8
FIGURE 11
TABLE 2
MINIMUM AND MAXIMUM PULLEY ADJUSTMENT
Blower Operation and Adjustments
A−Blower Operation
Minimum
Turns Open
Maximum
Turns Open
A Section
0
5
B Section
1*
6
Belt
1− Blower operation is manually set at the thermostat
subbase fan switch. With fan switch in ON position,
blowers will operate continuously.
2− With fan switch in AUTO position, the blower will cycle
with demand. Blower and entire unit will be off when
system switch is in OFF position.
*0 Minimum turns open when B belt is used on pulleys 6"
O.D. or larger.
BLOWER SPEED TAP SELECTION
DIRECT DRIVE UNITS
B−Determining Unit CFM
BLOWER
MOTOR
1− The following measurements must be made with a
dry indoor coil. Run blower without a cooling demand.
Air filters must be in place when measurements are
taken.
HARNESS
CONNECTOR
2− Measure static pressure external to unit (from supply
to return).
Belt Drive Blowers
3− Measure the indoor blower wheel RPM.
4− Refer to unit nameplate to determine the blower
motor horse power.
5− Referring to table 3 or 4, use the static pressure and
RPM readings to determine unit CFM.
DEPRESS TAB TO RELEASE
WIRE CONNECTOR. SELECT
CONNECTOR LOCATION FOR
NEW SPEED. INSERT WIRE UNTIL IT CLICKS.
6− The CFM can be adjusted at the motor pulley (see
section C−Blower Belt Adjustment).
FIGURE 12
BLOWER SPEED ADJUSTMENT
Direct Drive Blowers
7− Referring to tables 5, 6, or 7, use the static pressure
and blower speed tap to determine unit CFM.
TO INCREASE BELT TENSION
1 − Loosen 2 locking bolts.
2 − Pull motor mounting plate.
3 − Tighten motor mounting plate so plate is vertical.
8− The CFM can be adjusted at the motor (see figure 12
and unit wiring diagrams for blower speed
adjustment).
MOTOR MOUNTING PLATE
SET
SCREW
KEY
C−Blower Belt Adjustment
To increase blower CFM loosen set screw and turn pulley
clockwise. See figure 13. To decrease CFM turn pulley
counterclockwise. Do not exceed minimum and
maximum number of pulley turns as shown in table 2.
BLOWER
WHEEL
MOTOR & PULLEY
BELT
LOCKING BOLTS
TO INCREASE CFM
TO DECREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
TURN PULLEY
COUNTERCLOCKWISE
FIGURE 13
Page 9
proper pulley alignment and belt tension are maintained.
Overtensioning belts shortens belt and bearing life.
Check belt tension as follows:
Make sure blower and motor pulley are aligned as shown
1− Measure span length X. See figure 15.
in figure 14.
2− Apply perpendicular force to center of span (X) with
enough pressure to deflect belt 1/64" for every inch of
span length or 1.5mm per 100mm of span length.
Maximum life and wear can be obtained from belts only if
Important−Tension new belt after a 24−48 hour period of
operation. This will allow belts to stretch and seat
grooves. To increase belt tension, loosen 2 locking bolts
and pull mounting plate. Tighten motor mounting plate in
vertical position. See figure 13.
PULLEY ALIGNMENT
Example: Deflection distance of a 40" span would be
40/64" or 5/8".
Example: Deflection distance of a 400mm span
would be 6mm.
3− Measure belt deflection force. For a used belt, the
deflection force should be 5 lbs. (35kPa) . A new belt
deflection force should be 7 lbs. (48kPa).
ALIGNED
A force below these values indicates an
undertensioned belt. A force above these values
indicates an overtensioned belt.
BLOWER
PULLEY
BELT
MOTOR
PULLEY
MEASURE BELT TENSION
NOT ALIGNED
FORCE
FIGURE 14
DEFLECTION 1/64" PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FIGURE 15
Page 10
TABLE 3
LGA/LGC036−072 BELT DRIVE BLOWER PERFORMANCE
Air
Vol
Volume
cfm
(L/s)
TOTAL STATIC PRESSURE Inches Water Gauge (Pa)
.00 (00)
RPM
.20 (50)
.40 (100)
.60 (150)
.80 (200)
1.00 (250)
1.20 (300)
1.40 (350)
1.60 (400)
1.80 (450)
BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
0.05 495 0.10 630 0.20 750 0.30 855 0.40 950 0.60 1035 0.75 1120 1.00 1195 1.25 1270 1.50
(0.04)
(0.07)
(0.15)
(0.22)
(0.30)
(0.45)
(0.56)
(0.75)
(0.93)
(1.12)
900
(425)
350
1000
(470)
375
0.10
(0.07)
515
0.15
(0.11)
645
0.20
(0.15)
760
0.30
(0.22)
860
0.45
(0.34)
955
0.60
(0.45)
1040 0.75
(0.56)
1120 1.00
(0.75)
1195 1.20
(0.90)
1270 1.45
(1.08)
1100
(520)
400
0.10
(0.07)
535
0.15
(0.11)
665
0.25
(0.19)
775
0.35
(0.26)
870
0.45
(0.34)
960
0.60
(0.45)
1045 0.75
(0.56)
1125 0.95
(0.71)
1200 1.20
(0.90)
1270 1.45
(1.08)
1200
(565)
430
0.15
(0.11)
560
0.20
(0.15)
680
0.25
(0.19)
785
0.35
(0.26)
885
0.50
(0.37)
970
0.65
(0.48)
1055 0.80
(0.60)
1130 1.00
(0.75)
1205 1.20
(0.90)
1275 1.45
(1.08)
1300
(615)
460
0.20
(0.15)
590
0.25
(0.19)
700
0.30
(0.22)
805
0.40
(0.30)
895
0.50
(0.37)
985
0.65
(0.48)
1065 0.85
(0.63)
1140 1.00
(0.75)
1210 1.20
(0.90)
1280 1.45
(1.08)
1400
(660)
490
0.20
(0.15)
615
0.30
(0.22)
725
0.35
(0.26)
820
0.45
(0.34)
910
0.55
(0.41)
995
0.70
(0.52)
1075 0.85
(0.63)
1150 1.05
(0.78)
1220 1.25
(0.93)
1285 1.45
(1.08)
1500
(710)
525
0.30
(0.22)
645
0.35
(0.26)
745
0.40
(0.30)
840
0.50
(0.37)
930
0.65
(0.48)
1010 0.75
(0.56)
1085 0.90
(0.67)
1160 1.10
(0.82)
1225 1.25
(0.93)
1295 1.50
(1.12)
1600
(755)
560
0.35
(0.26)
670
0.40
(0.30)
770
0.50
(0.37)
860
0.60
(0.45)
945
0.70
(0.52)
1025 0.80
(0.60)
1100 0.95
(0.71)
1170 1.15
(0.86)
1240 1.30
(0.97)
1305 1.50
(1.12)
1700
(800)
595
0.40
(0.30)
700
0.45
(0.34)
795
0.55
(0.41)
885
0.65
(0.48)
965
0.75
(0.56)
1040 0.90
(0.67)
1115 1.05
(0.78)
1185 1.20
(0.90)
1250 1.40
(1.04)
−−−
1800
(850)
630
0.50
(0.37)
730
0.55
(0.41)
820
0.65
(0.48)
905
0.75
(0.56)
985
0.85
(0.63)
1060 1.00
(0.75)
1130 1.10
(0.82)
1200 1.30
(0.97)
1265 1.45
(1.08)
−−−
1900
(895)
665
0.55
(0.41)
760
0.65
(0.48)
850
0.75
(0.56)
930
0.85
(0.63)
1005 0.95
(0.71)
1080 1.05
(0.78)
1150 1.20
(0.90)
1215 1.35
(1.01)
1275 1.55
(1.16)
−−−
2000
(945)
700
0.65
(0.48)
790
0.75
(0.56)
875
0.85
(0.63)
955
0.95
(0.71)
1030 1.05
(0.78)
1100 1.20
(0.90)
1165 1.30
(0.97)
1230 1.45
(1.08)
1295 1.65
(1.23)
−−−
2100
(990)
735
0.75
(0.56)
825
0.85
(0.63)
905
0.95
(0.71)
980
1.05
(0.78)
1050 1.15
(0.86)
1120 1.30
(0.97)
1185 1.45
(1.08)
1250 1.60
(1.19)
1310 1.75
(1.31)
−−−
2200
(1040)
770
0.85
(0.63)
855
0.95
(0.71)
930
1.05
(0.78)
1005 1.15
(0.86)
1075 1.30
(0.97)
1140 1.40
(1.04)
1205 1.55
(1.16)
1265 1.70
(1.27)
−−−
−−−
2300
(1085)
805
1.00
(0.75)
885
1.10
(0.82)
960
1.20
(0.90)
1030 1.30
(0.97)
1100 1.40
(1.04)
1165 1.55
(1.16)
1225 1.70
(1.27)
1285 1.85
(1.38)
−−−
−−−
2400
(1135)
840
1.15
(0.86)
920
1.25
(0.93)
990
1.35
(1.01)
1060 1.45
(1.08)
1125 1.55
(1.16)
1190 1.70
(1.27)
1250 1.85
(1.38)
1305 2.00
(1.49)
−−−
−−−
2500
(1180)
875
1.25
(0.93)
950
1.40
(1.04)
1020 1.50
(1.12)
1085 1.60
(1.19)
1150 1.75
(1.31)
1210 1.85
(1.38)
1270 2.00
(1.49)
−−−
−−−
−−−
2600
(1225)
910
1.45
(1.08)
980
1.55
(1.16)
1050 1.65
(1.23)
1115 1.75
(1.31)
1175 1.90
(1.42)
1235 2.05
(1.53)
1295 2.20
(1.64)
−−−
−−−
−−−
2700
(1275)
945
1.60
(1.19)
1015 1.70
(1.27)
1080 1.85
(1.38)
1145 1.95
(1.45)
1205 2.10
(1.57)
1260 2.20
(1.64)
1320 2.40
(1.79)
−−−
−−−
−−−
2800
(1320)
980
1.80
(1.34)
1050 1.90
(1.42)
1110 2.05
(1.53)
1170 2.15
(1.60)
1230 2.30
(1.72)
1285 2.40
(1.79)
−−−
−−−
−−−
−−−
2900
(1370)
1015
2.00
(1.49)
1080 2.10
(1.57)
1140 2.25
(1.68)
1200 2.35
(1.75)
1260 2.50
(1.87)
1315 2.65
(1.98)
−−−
−−−
−−−
−−−
3000
(1415)
1050
2.20
(1.64)
1115 2.35
(1.75)
1175 2.45
(1.83)
1230 2.60
(1.94)
1285 2.70
(2.01)
−−−
−−−
−−−
−−−
−−−
Bold italics indicates field−furnished drive.
NOTES − 1) Field−installed drive kits are available for RPM ranges listed in table 14. Installer must provide drives for air requirements outside of these
ranges. 2) Units are not approved for operation above 1325 rpm.
Page 11
TABLE 4
LCA/LCC036−072 BELT DRIVE BLOWER PERFORMANCE
Air
V l
Volume
cfm
(L/s)
TOTAL STATIC PRESSURE Inches Water Gauge (Pa)
.00 (00)
.20 (50)
.40 (100)
.60 (150)
.80 (200)
1.00 (250) 1.20 (300) 1.40 (350) 1.60 (400)
1.80 (450)
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
(kW)
900
(427)
310
0.05 455
0.10 595
(0.04)
((0.07)
0.15 720
(0.11)
0.25 825
(0.19)
0.40 925
(0.30)
0.55 1015 0.70 1100 0.90 1180
1.10 1255
1.30
(0.41)
(0.52)
(0.67)
(0.82)
(0.97)
1000
(474)
330
0.05 470
(0.04)
0.10 605
(0.07)
0.20 725
(0.15)
0.30 830
(0.22)
0.40 925
(0.30)
0.55 1015 0.70 1095 0.90 1175
1.10 1250
1.30
(0.41)
(0.52)
(0.67)
(0.82)
(0.97)
1100
(521)
350
0.05 485
((0.04)
0.15 615
(0.11)
0.20 730
(0.15)
0.30 830
(0.22)
0.40 925
(0.30)
0.55 1015 0.75 1095 0.95 1170
1.10 1245
1.30
(0.41)
(0.56)
(0.67)
(0.82)
(0.97)
1200
(568)
375
0.10 505
(0.07)
0.15 630
(0.11)
0.25 740
(0.19)
0.35 840
(0.26)
0.45 930
(0.34)
0.60 1015 0.75 1095 0.90 1170
1.10 1240
1.30
(0.45)
(0.56)
(0.67)
(0.82)
(0.97)
1300
(615)
400
0.10 525
(0.07)
0.20 645
(0.15)
0.25 750
(0.19)
0.35 845
(0.26)
0.50 935
(0.37)
0.60 1020 0.80 1095 0.95 1170
1.10 1240
1.30
(0.45)
(0.60)
(0.71)
(0.82)
(0.97)
1400
(663)
425
0.15 545
(0.11)
0.20 660
(0.15)
0.30 760
(0.22)
0.40 855
(0.30)
0.50 940
(0.37)
0.65 1020 0.80 1100 0.95 1170
1.10 1240
1.35
(0.48)
(0.60)
(0.71)
(0.82)
(1.01)
1500
(710)
450
0.15 570
(0.11)
0.25 675
(0.19)
0.35 775
(0.26)
0.45 865
(0.34)
0.55 950
(0.41)
0.70 1030 0.85 1105 1.00 1175
1.20 1245
1.40
(0.52)
(0.63)
(0.75)
(0.90)
(1.04)
1600
(757)
475
0.20 590
(0.15)
0.30 695
(0.22)
0.40 790
(0.30)
0.50 875
(0.37)
0.60 960
(0.45)
0.75 1035 0.90 1110 1.05 1180
1.25 1245
1.40
(0.56)
(0.67)
(0.78)
(0.93)
(1.04)
1700
(804)
505
0.25 615
(0.19)
0.35 715
(0.26)
0.45 805
(0.34)
0.55 890
(0.41)
0.65 970
(0.48)
0.80 1045 0.95 1115 1.10 1185
1.30 1250
1.45
(0.60)
(0.71)
(0.82)
(0.97)
(1.80)
1800
(850)
535
0.30 640
(0.22)
0.40 735
(0.30)
0.50 820
(0.37)
0.60 905
(0.45)
0.70 980
(0.52)
0.85 1055 1.00 1125 1.15 1195
1.35 1255
1.50
(0.63)
(0.75)
(0.86)
(1.01)
(1.12)
1900
(899)
565
0.35 665
(0.26)
0.45 755
(0.34)
0.55 840
(0.41)
0.65 920
(0.48)
0.80 995
(0.60)
0.90 1065 1.05 1135 1.25 1200
1.40 1265
1.60
(0.67)
(0.78)
(0.93)
(1.04)
(1.19)
2000
(945)
595
0.40 690
(0.30)
0.50 775
(0.37)
0.60 860
(0.45)
0.70 935
(0.52)
0.85 1010 1.00 1080 1.15 1145 1.30 1210
1.50 1270
1.65
(0.63)
(0.75)
(0.86)
(0.97)
(1.12)
(1.23)
2100
(993)
625
0.45 715
(0.34)
0.55 800
(0.41)
0.70 875
0.80 950
(0.52)
(0..60)
0.90 1025 1.05 1090 1.20 1155 1.40 1220
1.55 1280
1.75
(0.67)
(0.78)
(0.90)
(1.04)
(1.16)
(1.31)
2200
(1040)
655
0.55 740
(0.41)
0.65 820
(0.48)
0.75 895
(0.56)
0.85 970
(0.63)
1.00 1040 1.15 1105 1.30 1170 1.45 1230
1.65 1290
1.85
(0.75)
(0.86)
(0.97)
(1.08)
(1.23)
(1.38)
2300
(1087)
685
0.60 765
(0.45)
0.70 845
(0.52)
0.85 920
(0.63)
0.95 990
(0.71)
1.10 1055 1.25 1120 1.40 1185 1.55 1245
1.75 1305
1.95
(0.82)
(0.93)
(1.04)
(1.16)
(1.31)
(1.45)
2400
(1135)
710
0.70 790
(0.52)
0.80 870
(0.60)
0.95 940
(0.71)
1.05 1010 1.20 1075 1.35 1135 1.50 1200 1.70 1260
1.85 1315
2.05
(0.78)
(0.90)
(1.01)
(1.12)
(1.27)
(1.38)
(1.53)
2500
(1182)
740
0.80 820
(0.60)
0.90 890
(0.67)
1.05 960
(0.78)
1.15 1030 1.30 1090 1.45 1155 1.60 1215 1.80 1270 1..95
(0.86)
(0.97)
(1.08)
(1.19)
(1.34)
(1.45)
−−−
2600
(1229)
770
0.90 845
(0.67)
1.00 915
(0.75)
1.15 985
(0.86)
1.30 1050 1.40 1110 1.55 1170 1.75 1230 1.90 1285
2.10
(0.97)
(1.04)
(1.16)
(1.31)
(1.42)
(1.57)
−−−
2700
(1276)
800
1.00 875
(0.75)
1.10 940
(0.82)
1.25 1005 1.40 1070 1.55 1130 1.70 1190 1.85 11245 2.05 1300
2.20
(0.93)
(1.04)
(1.16)
(1.27)
(1.38)
(1.53)
(1.64)
−−−
2800
(1323)
830
1.10 900
(0.82)
1.25 965
(0.93)
1.35 1030 1.50 1090 1.65 1150 1.85 1210 2.00 1265 2.20 1320
2.35
(1.01)
(1.12)
(1.23)
(1.38)
(1.49)
(1.64)
(1.75)
−−−
2900
(1371)
860
1.20 930
(0.90)
1.35 990
(1.01)
1.50 1055 1.65 1115 1.80 1170 1.95 1225 2.15 1280 2.30
(1.12)
(1.23)
(1.34)
(1.45)
(1.60)
(1.72)
−−−
−−−
3000
(1418)
890
1.35 955
(1.01)
1.50 1015 1.65 1075 1.80 1135 1.95 1190 2.10 1245 2.30 1300 2.50
(1.12)
(1.23)
(1.34)
(1.45)
(1.57)
(1.72)
(1.87)
−−−
−−−
Bold italics indicates field−furnished drives.
NOTES − 1) Field−installed drive kits are available for RPM ranges listed in table 14. Installer must provide drives for air requirements outside of these
ranges. 2) Units are not approved for operation over 1325 rpm.
Page 12
TABLE 5
036−060 DIRECT DRIVE BLOWER PERFORMANCE @ 208 VOLTS (Downflow)
Air Volume at Various Blower Speeds
External Static Pressure
High
Medium-High
cfm
L/s
Medium
cfm
L/s
Medium-Low
cfm
L/s
cfm
Low
L/s
in. w.g.
Pa
cfm
L/s
0
0
2530
1195
2265
1070
1970
930
1720
810
1440
680
.10
25
2495
1175
2235
1055
1945
920
1700
800
1430
675
.20
50
2450
1155
2200
1040
1915
905
1670
790
1415
670
.30
75
2405
1135
2160
1020
1880
890
1640
775
1390
655
.40
100
2355
1110
2115
1000
1840
870
1605
755
1360
640
.50
125
2300
1085
2065
975
1795
845
1565
740
1330
630
.60
150
2235
1055
2010
950
1745
825
1515
715
1290
610
.70
175
2165
1020
1945
920
1690
800
1460
690
1245
590
.80
200
2090
985
1875
885
1620
765
1400
660
1195
565
.90
225
2000
945
1790
845
1550
730
1330
630
1130
535
1.00
250
1895
895
1695
800
1460
690
1250
590
1055
500
1.10
275
1770
835
1580
745
1360
640
1160
545
975
460
1.20
300
1620
765
1440
680
1240
585
1055
500
870
410
NOTE All air data is measured external to unit with dry coil and 2 inch (51 mm) filters.
TABLE 6
036−060 DIRECT DRIVE BLOWER PERFORMANCE @ 230 VOLTS (Downflow)
Air Volume at Various Blower Speeds
External Static Pressure
High
Medium-High
cfm
L/s
Medium
cfm
L/s
Medium-Low
cfm
L/s
cfm
Low
L/s
in. w.g.
Pa
cfm
L/s
0
0
2750
1300
2500
1180
2245
1060
1955
925
1630
770
.10
25
2705
1275
2470
1165
2215
1045
1925
910
1600
755
.20
50
2650
1250
2430
1145
2180
1030
1890
890
1570
740
.30
75
2585
1220
2390
1130
2140
1010
1850
875
1535
725
.40
100
2535
1195
2340
1105
2100
990
1810
855
1500
710
.50
125
2475
1170
2290
1080
2050
965
1760
830
1455
685
.60
150
2405
1135
2225
1050
1995
940
1705
805
1405
665
.70
175
2330
1100
2155
1015
1930
910
1640
775
1365
645
.80
200
2245
1060
2075
980
1865
880
1575
745
1310
620
.90
225
2155
1015
1975
930
1780
840
1495
705
1240
585
1.00
250
2050
965
1860
880
1690
800
1405
665
1150
545
1.10
275
1935
915
1720
810
1585
750
1290
610
1040
490
1.20
300
1805
850
1560
735
1450
685
1160
545
915
430
NOTE All air data is measured external to unit with dry coil and 2 inch (51 mm) filters.
TABLE 7
036−060 DIRECT DRIVE BLOWER PERFORMANCE @ 460/575 VOLTS (Downflow)
Air Volume at Various Blower Speeds
External Static Pressure
High
Medium
Low
in. w.g.
Pa
cfm
L/s
cfm
L/s
cfm
L/s
0
0
2820
1330
2460
1160
1975
930
.10
25
2770
1305
2430
1145
1950
920
.20
50
2720
1285
2395
1130
1920
905
.30
75
2670
1260
2345
1105
1885
890
.40
100
2610
1230
2310
1090
1845
870
.50
125
2545
1200
2260
1065
1800
850
.60
150
2475
1170
2200
1040
1755
830
.70
175
2400
1130
2140
1010
1700
800
.80
200
2315
1090
2065
975
1635
770
.90
225
2220
1045
1980
935
1565
740
1.00
250
2115
1000
1880
885
1480
700
1.10
275
2000
945
1760
830
1370
647
1.20
300
1860
875
1615
760
1260
595
NOTE All air data is measured external to unit with dry coil and 2 inch (51 mm) filters.
Page 13
3− Any field installed accessories air resistance
(horizontal roof frame, diffuser, etc.). See tables 9
through 13.
E−Blower Table Notes
Blower tables include resistance for base units only with
two−row dry indoor coil and air filters in place. For all other
Use the blower table to determine blower motor
output and drives required.
units:
F−Field−Furnished Blower Drives
For field−furnished blower drives, use tables 3 and 4 to
1− Wet indoor coil air resistance of selected unit.
determine BHP and RPM required. Reference table 14 to
2− Any factory installed options air resistance (electric
determine the drive number and table 15 to determine the
manufacturer’s model number.
heat, economizer, etc.). See table 8.
TABLE 8
ACCESSORY AIR RESISTANCE
Determine total system design static pressure, then add:
Total Resistance inches water gauge (Pa)
Air Volume
Wet Indoor Coil
cfm
L/s
036S/036H/042S/
042H/048S/060S
048H/060H/072S
072H
Electric Heat
(LCA/LCC
Models)
Economizer
800
380
0.02 (4)
0.04 (9)
0.05 (13)
0.04 (10)
0.04 (10)
1000
470
0.02 (4)
0.05 (12)
0.07 (18)
0.06 (15)
0.04 (10)
1200
565
0.03 (8)
0.06 (16)
0.09 (24)
0.09 (22)
0.04 (10)
1400
660
0.04 (10)
0.08 (21)
0.12 (31)
0.12 (30)
0.04 (10)
1600
755
0.05 (13)
0.10 (26)
0.15 (38)
0.16 (40)
0.04 (10)
1800
850
0.06 (16)
0.12 (31)
0.18 (46)
0.21 (52)
0.05 (12)
2000
945
0.07 (18)
0.14 (36)
0.21 (53)
0.25 (62)
0.05 (12)
2200
1040
0.09 (21)
0.17 (42)
0.25 (62)
0.31 (77)
0.05 (12)
2400
1135
0.11 (27)
0.19 (48)
0.28 (70)
0.37 (92)
0.05 (12)
2600
1225
0.013 (32)
0.22 (54)
0.31 (77)
0.43 (107)
0.06 (15)
2800
1320
0.16 (40)
0.25 (63)
0.36 (88)
0.50 (125)
0.06 (15)
3000
1415
0.20 (50)
0.29 (71)
0.41 (101)
0.58 (144)
0.06 (15)
TABLE 9
CEILING DIFFUSER AIR RESISTANCE
Air Volume
Total Resistance inches water gauge (Pa)
RTD9 Step-Down Diffuser
RTD11 Step-Down Diffuser
FD9 Flush
2 Ends
1 Side
All Ends &
2
Ends
1 Side
All Ends &
Diffuser
Open
2 Ends Open Sides Open
Open
2 Ends Open Sides Open
FD11
Flush
Diffuser
cfm
L/s
800
380
0.15 (37
0.13 (32)
0.11 (27)
0.11 (27)
−−−−
−−−−
−−−−
−−−−
1000
470
0.19 (47
0.16 (40)
0.14 (35)
0.14 (35)
−−−−
−−−−
−−−−
−−−−
1200
565
0.25 (62
0.20 (50)
0.17 (42)
0.17 (42)
−−−−
−−−−
−−−−
−−−−
1400
660
0.33 (82
0.26 (65)
0.20 (50)
0.20 (50)
−−−−
−−−−
−−−−
−−−−
1600
755
0.43 (107
0.32 (80)
0.20 (50)
0.24 (60)
−−−−
−−−−
−−−−
−−−−
1800
850
0.56 (139
0.40 (100)
0.30 (75)
0.30 (75)
0.13 (32)
0.11 (27)
0.09 (22)
0.09 (22)
2000
945
0.73 (182
0.50 (125)
0.36 (90)
0.36 (90)
0.15 (37)
0.13 (32)
0.11 (27)
0.10 (25)
2200
1040
0.95 (237
0.63 (157)
0.44 (110)
0.44 (110)
0.18 (45)
0.15 (37)
0.12 (30)
0.12 (30)
2400
1135
−−−−
−−−−
−−−−
−−−−
0.21 (52)
0.18 (45)
0.15 (37)
0.14 (35)
2600
1225
−−−−
−−−−
−−−−
−−−−
0.24 (60)
0.21 (52)
0.18 (45)
0.17 (42)
2800
1320
−−−−
−−−−
−−−−
−−−−
0.27 (67)
0.24 (60)
0.21 (52)
0.20 (50)
3000
1415
−−−−
−−−−
−−−−
−−−−
0.32 (80)
0.29 (72)
0.25 (62)
0.25 (62)
Page 14
TABLE 12
FD9−65 CEILING DIFFUSER AIR RESISTANCE
TABLE 10
RTD9−65 CEILING DIFFUSER AIR RESISTANCE
Effective Throw
Air Volume
Effective Throw ft. (m)
Air Volume
cfm
L/s
ft.
m
cfm
L/s
ft.
m
1000
470
10−17
3−5
1000
470
15−20
5−6
1200
565
11−18
3−5
1200
565
16−22
5−7
1400
660
12−19
4−6
1400
660
17−24
5−7
1600
755
12−20
4−6
1600
755
18−25
5−7
1800
850
13−21
4−6
1800
850
20−28
6−9
2000
945
14−23
4−7
2000
945
21−29
6−9
2200
1040
16−25
5−8
2200
1040
22−30
7−9
Effective throw based on terminal velocities of 75 ft. (22.9 m) per minute.
Effective throw based on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 11
RTD11−95 CEILING DIFFUSER AIR RESISTANCE
TABLE 13
FD11−95 CEILING DIFFUSER AIR RESISTANCE
Effective Throw
Air Volume
Effective Throw
Air Volume
cfm
L/s
ft.
m
cfm
L/s
ft.
m
2600
1225
24−29
7−9
2600
1225
19−24
6−7
2800
1320
25−30
8−9
2800
1320
20−28
6−9
3000
1415
27−33
8−10
3000
1415
21−29
6−9
3200
1510
28−35
9−11
3200
1510
22−29
7−9
3400
1605
30−37
9−11
3400
1605
22−30
7−9
Effective throw based on terminal velocities of 75 ft. (22.9 m) per minute.
Effective throw based on terminal velocities of 75 ft. (22.9 m) per minute.
TABLE 14
FACTORY INSTALLED DRIVE KIT SPECIFICATIONS
Motor Outputs
RPM Range
Nominal hp
Maximum hp
Nominal kW
Maximum kW
Drive 1
Drive 2
Drive 3
Drive 4
Standard or High Efficiency − 1.5
1.72
1.1
1.3
615 − 920
800 − 1105
−−−−
−−−−
Standard or High Efficiency − 2
2.3
1.5
1.7
−−−−
−−−−
920 − 1230
−−−−
Standard Efficiency Only − 3
3.45
2.2
2.6
−−−−
−−−−
−−−−
1070 − 1325
In Canada, nominal motor output is also maximum usable motor output. If motors of comparable output are used, be sure to keep within
the service factor limitations outlined on the motor nameplate.
TABLE 15
MANUFACTURER’S NUMBERS
DRIVE
NO
NO.
ADJUSTABLE SHEAVE
DRIVE COMPONENTS
FIXED SHEAVE
BELTS (1 REQUIRED)
BROWNING NO.
OEM PART NO.
BROWNING NO.
OEM PART NO.
BROWNING NO.
OEM PART NO.
1
1VP34x7/8
31K6901
AK59x1
31K6801
AX43
73K8201
2
1VP40x7/8
79J0301
AK59x1
31K6801
AX43
73K8201
3
1VP44x7/8
P−8−1488
AK59x1
31K6801
AX44
12L2601
4
1VP44x7/8
P−8−1488
AK51x1
18L2201
AX43
73K8201
Page 15
2− Suction pressure must drop, discharge pressure
must rise, and blower rotation must match rotation
marking.
Cooling Start−Up
IMPORTANT−The crankcase heater (standard on some
models) must be energized for 24 hours before
attempting to start compressor. Set thermostat so there
is no demand to prevent compressor from cycling.
Apply power to unit.
If pressure differential is not observed or blower rotation is
not correct:
3− Disconnect all remote electrical power supplies.
4− Reverse any two field−installed wires connected to
the line side of S48 disconnect, CB10 circuit breaker,
or TB2 terminal strip. Do not reverse wires at blower
contactor.
IMPORTANT
Units contain either R−22 or R−410A refrigerant.
Check the nameplate to determine the type of refrigerant before installation or servicing.
5− Make sure the connections are tight.
A−Preliminary Checks
Discharge and suction pressures should operate at
their normal start-up ranges.
1− Make sure that unit is installed in accordance with the
installation instructions and applicable codes.
D−R−410A Refrigerant
2− Inspect all electrical wiring, both field and factory
installed, for loose connections. Tighten as required.
3− Check to ensure that refrigerant lines do not rub
against the cabinet or against other refrigerant lines.
4− Check voltage at disconnect switch. Voltage must
be within range listed on nameplate. If not, consult
power company and have voltage condition
corrected before starting unit.
5− Refer to unit diagram located on inside of
compressor access door for unit wiring.
6− Adjust blower belt or blower speed tap according to
Blower Operation and Adjustments" section.
Units charged with R−410A refrigerant operate at much
higher pressures than R−22. The expansion valve and
liquid line drier provided with the unit are approved for use
with R−410A. Do not replace them with components
designed for use with R−22.
R−410A refrigerant is stored in a pink cylinder.
Manifold gauge sets used with systems charged with
R−410A refrigerant must be capable of handling the
higher system operating pressures. The gauges should
be rated for use with pressures of 0−800 on the high side
and a low side of 30" vacuum to 250 psi with dampened
speed to 500 psi. Gauge hoses must be rated for use at up
to 800 psi of pressure with a 4000 psi burst rating.
7− Make sure filters are in place before start-up.
IMPORTANT
B−Start−Up
Mineral oils are not compatible with R−410A. If oil
must be added, it must be a polyol ester oil.
1− Set fan switch to AUTO or ON and move system
selection switch to cool. Adjust thermostat to a
setting below room temperature to bring on the
compressor. Compressor will start and cycle on
demand from thermostat.
E−Charging/Checking Charge
2− The refrigerant circuit is charged with either
HCFC−22 or R−410A refrigerant. See unit rating
plate for type of refrigerant and correct amount of
charge.
This unit is factory charged and should require no further
adjustment. If the system requires charge, reclaim the
charge, evacuate the system, and add required
nameplate charge.
3− Refer to Cooling Operation and Adjustment section for
proper method to check refrigerant charge.
NOTE − System charging is not recommended below 60F
(15C). In temperatures below 60F (15C), the charge
must be weighed into the system.
C−Three Phase Scroll Compressor Voltage Phasing
Three phase scroll compressors must be phased
sequentially to ensure correct compressor and blower
rotation and operation. Compressor and blower are
wired in phase at the factory
WARNING−Do not exceed nameplate charge under any
condition.
If weighing facilities are not available, or to check the
charge, use the following procedure:
IMPORTANT − Charge unit in standard cooling mode.
1− Observe suction and discharge pressures and
blower rotation on unit start−up.
Page 16
1− Attach gauge manifolds and operate unit in cooling
mode until system stabilizes (approximately five
minutes). Make sure all outdoor air dampers are closed.
2− Use a thermometer to accurately measure the
outdoor ambient temperature.
3− Apply the outdoor temperature to tables 16 through
34 to determine normal operating pressures.
4− Compare the normal operating pressures to the
pressures obtained from the gauges. Minor
variations in these pressures may be expected due to
differences in installations. Significant differences
could mean that the system is not properly charged or
that a problem exists with some component in the
system. Correct any system problems before
proceeding.
5− If discharge pressure is high, remove refrigerant from
the system. If discharge pressure is low, add
refrigerant to the system.
Add or remove charge in increments.
Allow the system to stabilize each time refrigerant is
added or removed.
6− Use the following subcooling method along with the
normal operating pressures to confirm readings.
TABLE 16
LG/LC Series 036H R−22 Std. & Humiditrol®
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
146
169
114
225
257
291
Suction +5
psig
75
76
78
79
80
82
TABLE 17
LG/LC Series 036S R−22
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
162
186
211
244
276
312
Suction +5
psig
79
80
82
83
84
86
Outdoor Coil
Entering Air Temp
DIscharge
+10psig
Suction +5
psig
65F
75F
85F
95F
105F
115F
156
182
210
240
275
300
79
81
82
83
85
86
TABLE 20
LG/LC Series 042S R−22
Outdoor Coil
Entering Air Temp
DIscharge
+10psig
Suction +5
psig
65F
75F
85F
95F
105F
115F
165
190
218
254
283
319
75
75
77
79
81
83
TABLE 21
LG/LC Series 048H R−22
Outdoor Coil
Entering Air Temp
DIscharge
+10psig
Suction +5
psig
65F
75F
85F
95F
105F
115F
156
180
207
236
267
302
75
77
78
78
78
78
TABLE 22
LG/LC Series 048S R−22
Outdoor Coil
Entering Air Temp
DIscharge
+10psig
Suction +5
psig
65F
75F
85F
95F
105F
115F
163
188
217
246
280
317
72
73
75
76
77
79
TABLE 23
LG/LC Series 048H R−22 Humiditrol®
TABLE 18
LG/LC Series 036H R−410A Std. & Humiditrol®
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
TABLE 19
LG/LC Series 042H R−22
DIscharge
+10psig
Suction +5
psig
237
272
312
356
404
456
131
132
134
138
143
150
Page 17
Outdoor Coil
Entering Air Temp
DIscharge
+10 psig
Suction +5
psig
65F
75F
85F
95F
105F
115F
157
188
219
249
280
310
75
77
79
81
83
85
TABLE 29
LG/LC Series 060H R−410A Humiditrol®
TABLE 24
LG/LC Series 048H R−410A Std. & Humiditrol®
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10 psig
Suction +5
psig
255
291
332
376
425
477
134
135
137
139
142
146
TABLE 25
LG/LC Series 060H R−22
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
165
192
221
253
287
323
DIscharge
+10psig
174
184
221
247
284
334
Suction +5
psig
75
76
78
80
82
83
DIscharge
+10 psig
169
201
233
265
297
329
Suction +5
psig
71
72
74
75
76
78
DIscharge
+10psig
269
307
349
395
445
499
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
185
210
238
269
304
338
Suction +5
psig
76
77
78
80
81
83
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
191
224
258
292
326
360
Suction +5
psig
71
72
74
75
77
78
TABLE 32
LG/LC Series 072S R−22 Humiditrol®
Suction +5
psig
72
74
76
79
81
84
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
TABLE 28
LG/LC Series 060H R−410A
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
Suction +5
psig
126
131
133
137
139
145
TABLE 31
LG/LC Series 072S R−22
TABLE 27
LG/LC Series 060H R−22 Humiditrol®
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10psig
275
321
367
412
459
506
TABLE 30
LG/LC Series 072H R−22
TABLE 26
LG/LC Series 060S R−22
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10 psig
196
221
248
283
316
353
Suction +5
psig
70
71
72
75
77
79
TABLE 33
LG/LC Series 072H R−410A Std.
Suction +5
psig
131
134
136
139
141
143
Page 18
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10 psig
Suction +5
psig
292
333
378
426
479
535
135
138
142
145
149
153
High Pressure Switch (S4) R−410A
The compressor circuit is protected by a high
pressure switch which opens at 640 psig + 10 psig
(4413 kPa + 70 kPa) and automatically resets at 475
psig + 20 psig (3275kPa + 138 kPa).
TABLE 34
LG/LC Series 072S R−410A Std.
Outdoor Coil
Entering Air Temp
65F
75F
85F
95F
105F
115F
DIscharge
+10 psig
Suction +5
psig
301
342
386
437
488
547
130
133
136
141
145
149
2− Low Pressure Switch (S87) R−22
The compressor circuit is protected by a loss of
charge switch. Switch cuts out at 25 psig (172 kPa)
and automatically resets at 55 psig (379 kPa).
Low Pressure Switch (S87) R−410A
The compressor circuit is protected by a loss of
charge switch. Switch opens at 40 psig + 5 psig (276
+ 34 kPa) and automatically resets at 90 psig + 5
psig (621 kPa + 34 kPa).
F−Charge Verification − Subcooling Method
If ambient temperature is above 60F (15C), read liquid
line temperature. Read liquid line pressure from gauge and
convert to condensing temperature using standard R−22 or
R−410A temperature/pressure conversion chart (or
conversion scale on gauge). The difference between the
condensing temperature and the liquid line temperature is
subcooling (subcooling = condensing temperature minus
liquid line temperature). The subcooling should
approximate the value given in table 35. Add refrigerant to
increase subcooling and remove refrigerant to reduce
subcooling.
3− Freezestat (S49)
The compressor is protected by a freezestat located
on the indoor coil. The freezestat opens at 29F+3
(−2C+2) and closes at 58F+4 (14C+2).
4− Compressor Crankcase Heater (HR1)
Crankcase heater must be energized at all times to
prevent compressor damage due to refrigerant
migration. Energize crankcase heater 24 hours before
unit start−up by setting thermostat so that there is no
cooling demand (to prevent compressor from cycling)
and apply power to unit.
TABLE 35
SUBCOOLING
R−22
Unit
Temperature
036S, 042S, 042H, 048S, 072H Std.
10F + 1 (5.6C + 0.5)
Humiditrol®
7F + 1 (3.9C + 0.5)
036H Std. &
048H Std.
12F + 1 (6.6C + 0.5)
060H Std.
11F + 1 (6.1C + 0.5)
072S Std.
19F + 1 (11C + 0.5)
060S Std.
14F + 1 (7.8C + 0.5)
048H Humiditrol®
072S Humiditrol®
16F + 1 ( 9C + 0.5)
Humiditrol®
15F + 1 (8.3C + 0.5)
060H
5− Low Ambient Pressure Switch (S11) R−22
Switch maintains adequate discharge pressure by
de−energizing condenser fan when liquid pressure
falls below 140 psig +10 (965 kPa+69). S11 is
installed in the liquid line. Switch closes to energize
condenser fan when pressure rises to 275 psig +10
(1896kPa + 69).
R−410A
036 Std. &
Humiditrol®
072S, 048 Std. &
Humiditrol®
8F + 1 (4.4C + 0.5)
9F + 1 (5.0C + 0.5)
060H Std.
11F + 1 (6.1C + 0.5)
060H Humiditrol
15F + 1 (8.3C + 0.5)
072H Std.
15F + 1 (8.3C + 0.5)
G−Compressor Controls
1− High Pressure Switch (S4) R−22
The compressor circuit is protected by a high
pressure switch which cuts out at 450 psig + 10 psig
(3103 kPa + 70 kPa) and automatically resets at 300
psig + 20psig (2069kPa + 138kPa).
Page 19
Low Ambient Pressure Switch (S11) R−410A
Switch maintains adequate discharge pressure by
de−energizing condenser fan when liquid pressure
falls below 240 psig +10 (1655 kPa+69). S11 is
installed in the liquid line. Switch closes to energize
condenser fan when pressure rises to 450 psig +10
(3103kPa + 69).
6− Discharge Line Thermostat (S40)
3 through 5 Ton Units Only
Switch opens when discharge line temperature
reaches 94F+5 (34C+3) and closes when
temperature falls below 74F+5 (23C+3). Prevents
crankcase heater operation in warm weather.
Heating Start−Up
WARNING
FOR YOUR SAFETY READ BEFORE LIGHTING
Danger of explosion and fire. Can cause
injury or product or property damage.
You must follow these instructions
exactly.
BEFORE LIGHTING smell all around the unit area for
gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
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 do not try to repair it. Call a qualified service
technician. Force or attempted repair may result in a
fire or explosion.
A−Placing Unit In Operation
Gas Valve Operation for White Rodgers 36C (figure
16), White Rodgers 36E (figure 17), Honeywell
VR8205M (figure 18), and Honeywell VR8205Q /
VR8305Q (figure 19)
This unit is equipped with an automatic spark ignition
system. There is no pilot. In case of a safety shutdown,
move thermostat switch to OFF and return the
thermostat switch to HEAT to reset the ignition control.
WARNING
1− Set thermostat to lowest setting.
2− Turn off all electrical power to appliance.
3− This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
WHITE RODGERS 36C76 GAS VALVE
SMOKE POTENTIAL
The heat exchanger in this unit could be a source of
smoke on initial firing. Take precautions with respect to building occupants and property. Vent initial supply air outside when possible.
STAGE 2 MANUAL MANIFOLD
PRESSURE ADJUSTMENT
SCREW UNDER CAP
INLET
PRESSURE
TAP
MANIFOLD
PRESSURE
TAP
GAS VALVE SHOWN
IN OFF" POSITION
WARNING
Danger of explosion. Can cause injury
or product or property damage. If
overheating occurs or if gas supply
fails to shut off, shut off the manual gas
valve to the unit before shutting off
electrical supply.
D−1
C−1
C2
GV−1
GV−2
WARNING
FIGURE 16
Electric shock hazard. Can cause injury
or death. Do not use this unit if any part
has been under water. Immediately call
a qualified service technician to inspect
the unit and to replace any part of the
control system and any gas control
which has been under water.
WHITE RODGERS 36E GAS VALVE
WARNING
NO
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Page 20
OFF
INLET
PRESSURE
TAP (SIDE)
Gas valve knob is shown
in OFF position.
FIGURE 17
MANIFOLD
PRESSURE
TAP (SIDE)
7− 36C, VR8205, & 8305 −
Turn the knob on the gas valve counterclockwise
to ON". Do not force.
36E −
Turn the knob 180° either way to ON".
HONEYWELL VR8205M SERIES GAS VALVE
INLET
PRESSURE
TAP
MANIFOLD
PRESSURE
TAP
8− Close or replace the heat section access panel.
9− Turn on all electrical power to appliance.
ON
10− Set thermostat to desired setting.
OFF
11− The combustion air inducer will start. The burners will
light within 40 seconds.
Gas valve knob is shown in OFF position.
12− If the appliance does not light the first time (gas line
not fully purged), it will attempt up to two more
ignitions before locking out.
FIGURE 18
HONEYWELL VR8205Q/VR8305Q SERIES GAS VALVE
13− If lockout occurs, repeat steps 1 through 10.
HIGH FIRE
ADJUSTMENT
LOW FIRE
ADJUSTMENT
MANIFOLD
PRESSURE
TAP
14− If the appliance will not operate, follow the
instructions Turning Off Gas to Appliance" and call
your service technician or gas supplier.
Turning Off Gas to Appliance
1− If using an electromechanical thermostat, set to the
lowest setting.
INLET
PRESSURE
TAP
2− Before performing any service, turn off all electrical
power to the appliance.
Gas valve knob is shown in OFF position.
3− Open or remove the heat section access panel.
FIGURE 19
4− Open or remove the heat section access panel.
5− 36C, VR8205, & VR8305 −
Turn the knob on the gas valve clockwise
to
OFF". Depress 36C knob slightly. Do not force.
36E −
Turn the knob 180° either way to OFF".
6− Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your
gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions. If you do not smell gas, go to
the next step.
Page 21
4− 36C, VR8205, & VR8305 −
to
Turn the knob on the gas valve clockwise
OFF". Depress 36C knob slightly. Do not force.
36E −
Turn the knob 180° either way to OFF".
5− Close or replace the heat section access panel.
WARNING
Danger of explosion. Can cause injury or
death. Do not attempt to light manually.
Unit has a direct spark ignition system.
2− Burner flames may be observed through the
inspection port in the access panel. Always operate
the unit with the access panel in place.
Heating Operation and Adjustments
A−Heating Sequence of Operation
1− When the thermostat calls for heat, the combustion
air blower starts immediately.
WARNING
2− The combustion air switch checks for proper blower
operation before allowing power to the ignition
controller. This switch is factory set and no
adjustment is necessary.
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
3− After a pre−purge of 45 seconds, the spark ignitor is
energized, and the solenoid valve opens in the gas
valve.
3− The gap on the flame sensing electrode should be
between 3/32" and 5/32" (0.094 − 0.156 mm).
Remove right burner by removing screw and sliding
the burner off the orifice. The carry over slot on all
burners is 1/8" (.125 mm) and it must be maintained.
Clean the carry over slot using a strip of 16 gauge
steel. Check gap with 1/8" (.125mm) twist drill.
Replace all burners using mounting screws.
4− The spark then ignites the gas, the ignition sensor
proves the flame and the combustion process
continues.
5− In the event that the flame is not detected after the first
trial for ignition, the controller will repeat steps 3 and 4
up to two more times (depending upon controller
model) before locking out.
6− For troubleshooting purposes, an ignition attempt
after lock out may be re−established manually. Move
thermostat OFF" and return thermostat switch to
HEAT" position.
B−Limit Control
Limit controls are factory set and not adjustable.
4− Gas manifold pressures should match pressures
shown in table 36. On two stage gas valves, initiate a
W2 thermostat demand to check high fire pressure
before low fire pressure. With high fire operating,
reduce the thermostat demand to W1 and check the
low fire pressure. Refer to the IMC manual to initiate a
thermostat demand.
IMPORTANT − Do not set low fire pressure lower than
the certified minimum input rating listed in table 36.
Two primary limits are located on the division panel
between the return and supply sections on high heat
units. One primary limit is located on the division panel on
standard heat units.
A secondary limit is located on the blower transition in
both standard and high heat units.
C−Heating Adjustment
1− Main burners are factory adjusted for proper flame.
Air shutters are provided for localized areas if
necessary.
Page 22
TABLE 36
MANIFOLD INPUT PRESSURES in.wg. (kPa)
Natural Gas
Propane (LP) Gas
1st
Stage
+ 0.2
(+.05)
2nd
Stage
+ 0.3
(+.08)
1st
Stage
+ 0.2
(+.05)
2nd
Stage
+ 0.3
(+.08)
036, 042, 048, 060,
072 Std./High Heat
NA
3.5
(0.87)
NA
10.5
(2.61)
042, 048, 060, 072
Dual Heat
1.9
(0.47)
3.5
(0.87)
5.3
(1.32)
10.5
(2.61)
LGA/LGC Unit
Humiditrol® Start−Up And Operation
General
Humiditrol® units provide a dehumidifying mode of
operation. These units contain a reheat coil adjacent to
and downstream of the evaporator coil. Reheat coil
solenoid valve, L14, routes hot discharge gas from the
compressor to the reheat coil. Return air pulled across
the evaporator coil is cooled and dehumidified; the
reheat coil adds heat to supply air. See figure 20 for
reheat refrigerant routing and figure 21 for standard
cooling refrigerant routing.
REHEAT MODE REFRIGERANT ROUTING
RETURN
AIR
EVAPORATOR
COIL
OUTDOOR
AIR
EXPANSION
VALVE
REHEAT
COIL
SUPPLY
AIR
COMPRESSOR
CONDENSER
COIL
CHECK
VALVE
REHEAT
VALVE
FIGURE 20
COOLING MODE REFRIGERANT ROUTING
RETURN
AIR
EVAPORATOR
COIL
OUTDOOR
AIR
EXPANSION
VALVE
REHEAT
COIL
SUPPLY
AIR
COMPRESSOR
CHECK
VALVE
REHEAT
VALVE
FIGURE 21
Page 23
CONDENSER
COIL
RH1 BOARD LOCATION ON M1 BOARD
A67 (RH1)
A55 (M1):
A56
(EM1)
A67
(RH1)
RH1 REHEAT
CONTROL BOARD
P175
HUMIDITROL®
PLUG
YELLOW LED
INDICATES OUTPUT TO
L14 REHEAT VALVE
FLASHING GREEN
HEARTBEAT" LED
INDICATES NORMAL
OPERATION
1
FIGURE 22
L14 Reheat Coil Solenoid Valve
Read Relative Humidity At IMC
When IMC board input (P114−10) indicates room
conditions require dehumidification, L14 reheat valve is
energized (RH1 board P175−3) and refrigerant is routed
to the reheat coil.
Turn MODE DIP TEMP" ON". Display will alternately
flash from readout to output. A single push on the
pushbutton will toggle advance to different sensor
readings. A double push will toggle the readout the
opposite direction. Once readout rH" is displayed
alternately with the output, use table 37 to determine the
percent relative humidity.
TABLE 37
RH1 Humiditrol® Board
The RH1 add−on board is factory−installed in all
Humiditrol® units. RH1 is located on the M1 board as
shown in figure 22.
Relative Humidity (%RH + 3%)
20
30
40
50
60
70
80
90
Reheat Setpoint
Reheat is factory−set to energize when indoor relative
humidity rises above 60% (default). The reheat setpoint
can be adjusted by changing ECTO 4.25. A setting of
100% will operate reheat from an energy management
system digital output. The reheat setpoint can also be
adjusted using an optional Network Control Panel (NCP).
Sensor Output (VDC)
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
Check−Out
Reheat will terminate when the indoor relative humidity falls
3% (57% default) or the digital output de−energizes. The
reheat deadband can be adjusted 1−10% RH by changing
ECTO 4.26.
Test Humiditrol operation using the following procedure.
A91 Humidity Sensor
3− For RH sensors, set IMC ECTO reheat setpoint
parameter 4.25 to 0% relative humidity. For digital
input, set IMC ECTO reheat setpoint parameter 4.25
to 100% relative humidity.
1− Make sure reheat is wired as shown in wiring section.
2− Set IMC ECTO system mode parameter 6.01 to
option 0 (default local thermostat mode)
Install humidity sensor in the conditioned space
according to instructions provided with sensor.
Relative humidity should correspond to the sensor (A91)
output voltage listed in table 37. For example: if indoor air
relative humidity is 80% + 3%, the humidity sensor output
should read 8.00VDC.
Check the sensor output annually for accuracy. Keep the
air intake openings on the sensor clean and free of
obstructions and debris.
4− Jumper the following TB1 terminals:
8 & 9 (occupied mode)
6 & 3 (blower demand G)
24 & 6 (digital input applications only)
The blower, compressor 1 (reheat) should be operating. L14
LED on the A67 board should also be ON, indicating the
reheat valve is energized.
Page 24
5− Press the IMC pushbutton to by−pass the compressor
minimum run delay.
ECTO 4.24 option 7 −
3− System must NOT be operating in heating mode.
6− For RH sensors, disconnect the jumper between TB1
terminals 8 & 9 (occupied mode). For digital input,
remove the jumper between TB1−6 & 24.
Once the corresponding conditions are met in each
mode, reheat will operate as shown in table 38.
Compressor 1 (reheat) should de−energize, L14 LED
should go OFF, blower should still be energized.
TABLE 38
Reheat Operation
T’stat and Humidity Demands
8− When check−out is complete, remove all jumpers,
set ECTO 4.25 back to the proper humidity
setpoint, and set ECTO 6.01 to the proper setting.
Default Reheat Operation
Humiditrol unit reheat control parameter 4.24 is
factory−set to option 6. Reheat will operate as shown in
table 38 once three conditions are met:
1− Blower must be operating.
Operation
Reheat Only
Compressor Reheat
Reheat & Y1
Compressor Cooling*
*If there is no reheat demand and outdoor air is suitable,
free cooling will operate.
Combination of Demands
3− System must NOT be operating in heating mode.
Table 38 shows unit operation at reheat and thermostat
demands. The following examples show unit operation
when reheat and thermostat demands overlap.
IMPORTANT − Free cooling does not operate during
reheat. Free cooling will operate as shown in the IMC
manual.
1− Compressor is operating (Y1) and a reheat
demand is initiated:
No change in operation.
2− System must be in occupied mode.
Reheat Control Options
Reheat control parameter 4.24 can be set to other reheat
control operating conditions as follows (see IMC manual):
ECTO 4.24 option 3 −
1− Blower must be operating.
2− System must be in occupied mode.
3− System must NOT be operating in heating mode.
4− One cooling demand is required if the unit has been in
heating mode, the IMC has been reset, or at initial unit
start−up.
ECTO 4.24 option 5 −
3− System must NOT be operating in heating mode.
4− One cooling demand is required if the unit has been in
heating mode, the IMC has been reset, or at initial unit
start−up.
Page 25
2− Compressor reheat is operating and outdoor air
IS NOT SUITABLE for free cooling; then a Y1
cooling demand is initiated:
Compressor is not de−energized; L14 reheat valve is
de−energized for compressor cooling.
3− Compressor reheat is operating and outdoor air
IS SUITABLE for free cooling; then a Y1 cooling
demand is initiated:
Compressor is not de−energized; L14 reheat valve is
de−energized for compressor cooling. Free cooling is
not allowed if a reheat demand is present.
C−Burners
Service
1− Periodically examine burner flames for proper
appearance during the heating season. Use
inspection port in the front of the burner compartment
access panel.
The unit should be inspected once a year by a qualified
service technician.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of
California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
P.O. Box 799900
Dallas, TX 75379−9900
2− Before each heating season examine the burners for
any deposits or blockage which may have occurred.
3− Clean burners as follows:
a−Turn off both electrical power and gas supply to
unit.
b−Remove access panel to burner compartment.
c−Remove burner mounting screws and lift burners
from orifice.
d−Clean as necessary and replace burners and secure
with mounting screws. Make sure that burner heads
line up correctly. Spark gaps on ignitor and flame
sensing electrode must be properly set. Refer to
Heating Adjustment section. Replace access panel.
A−Lubrication
All motors and blower shaft bearings are prelubricated.
No further lubrication is needed.
WARNING
B−Filters
Unit is equipped with two 16 X 25 X 2" pleated throw−away
type filters. Filters should be checked monthly and
replaced when necessary. See figure 23.
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
NOTE−Filters must be U.L.C. certified or equivalent for
use in Canada.
e− Restore electrical power and gas supply. Follow
lighting instructions located on inside panel. Use
inspection port in access panel to check flame.
FILTER REMOVAL
D−Combustion Air Inducer
A combustion air blower motor proving switch, S18,
checks combustion air inducer operation before allowing
power to the gas controller. Gas controller will not operate
if inducer is obstructed.
Under normal operating conditions, the combustion air
inducer wheel should be checked and cleaned prior to the
heating season. However, it should be examined
periodically during the heating season to establish an
ideal
cleaning
schedule.
With
power
supply
disconnected, the condition of the inducer wheel can be
determined by looking through the vent opening.
FIGURE 23
Page 26
F−Condenser Coil
Cleaning Combustion Air Inducer and Vent Cap
1− Shut off power supply and gas to unit.
WARNING
2− Remove the heat access panel. Disconnect motor
wires & three motor mounting screws.
3− Clean inducer wheel with a small brush and wipe off
any dust from housing. See figure 24. Clean
accumulated dust from front of flue box cover. Inspect
flue passageway and flue box when removing the
combustion air inducer. If cleaning is necessary use
wire brush.
CLEAN INDUCER WHEEL WITH BRUSH
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Clean condenser coil annually with detergent or
commercial coil cleaner and inspect monthly during the
cooling season.
Formed condenser coils are made of individual coil slabs.
Dirt and debris may become trapped between the slabs.
To clean between slabs, carefully separate coil slabs and
wash them thoroughly. See figure 25.
G−Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
FIGURE 24
4− Replace combustion air inducer motor by reversing
this procedure. It is recommended that the
combustion air inducer gasket (if present) be
replaced during reassembly.
5− Clean combustion air supply (hood located on heat
access panel) using a small brush.
FORMED COIL CLEANING PROCEDURE
SEPARATE THIS END ONLY
EVAPORATOR
E−Evaporator Coil
HEAT
SECTION
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Inspect and clean coil at beginning of each cooling and
heating season. Clean using mild detergent or
commercial coil cleaner. Flush coil and condensate drain
with water taking care not to get insulation, filters, return
air ducts wet.
Page 27
1−Remove rear and corner mullion holding coil.
2−Remove clips connecting coil slabs and separate slabs
3"−4" (76 mm−102mm).
3−Clean coils with detergent or commercial coil cleaner.
4−Rinse thoroughly with water and reassemble.
FIGURE 25
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