Carrier | 48JZ (N) 024-060 | Operating instructions | Carrier 48JZ (N) 024-060 Operating instructions

48JZ(N) 024-060
Single Packaged Gas Heating/Electric Heat Pump
Units With Puron® (R-410A) Refrigerant
Visit www.carrier.com
Installation, Start-Up, and Operating Instructions
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION ..........................................................................2
RECEIVING AND INSTALLATION ..........................................2
CHECK EQUIPMENT.............................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
PROVIDE UNIT SUPPORT....................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
FIELD FABRICATE DUCTWORK........................................3
PROVIDE CLEARANCES ......................................................4
RIG AND PLACE UNIT .........................................................6
CONNECT CONDENSATE DRAIN ......................................6
INSTALL FLUE HOOD ..........................................................6
INSTALL GAS PIPING...........................................................7
INSTALL DUCT CONNECTIONS ........................................9
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE ............................................................9
INSTALL ELECTRICAL CONNECTIONS.........................10
HIGH-VOLTAGE CONNECTIONS................................10
SPECIAL PROCEDURES FOR 208-V OPERATION ...11
CONTROL VOLTAGE CONNECTIONS.......................11
HEAT ANTICIPATOR SETTING...................................11
TRANSFORMER PROTECTION....................................11
ELECTRICAL CONTROLS AND WIRING ..................25
HEAT PUMP SYSTEM ITEMS ......................................26
REFRIGERANT CIRCUIT...............................................27
GAS INPUT ......................................................................27
INDOOR AIRFLOW ........................................................27
PURON® SYSTEM ITEMS ............................................27
TROUBLESHOOTING ...............................................................28
START-UP CHECKLIST............................................................28
NOTE TO INSTALLER — Before the installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User’s Manual and Replacement Guide are left with
the unit after installation. The furnace is NOT to be used for
temporary heating of buildings or structures under construction.
PRE-START-UP ..........................................................................12
START-UP ...................................................................................13
CHECK FOR REFRIGERANT LEAKS ...............................13
START-UP HEAT AND MAKE ADJUSTMENTS.............13
CHECK HEATING CONTROL.......................................13
HEATING SEQUENCE OF OPERATION-HEAT
PUMP.................................................................................18
HEATING
SEQUENCE
OF
OPERATION-GAS
HEAT.................................................................................18
START-UP COOLING AND MAKE ADJUSTMENTS......19
COOLING SEQUENCE OF OPERATION.....................19
CHECKING COOLING CONTROL OPERATION (NONICM UNITS)......................................................................19
MAINTENANCE.........................................................................20
AIR FILTER......................................................................22
INDOOR BLOWER AND MOTOR ................................22
FLUE GAS PASSAGEWAYS .........................................24
COMBUSTION-AIR BLOWER.......................................24
LIMIT SWITCH................................................................25
BURNER IGNITION ........................................................25
MAIN BURNERS .............................................................25
OUTDOOR COIL, INDOOR COIL, AND
CONDENSATE DRAIN...................................................25
OUTDOOR FAN...............................................................25
C99088
Fig. 1—Unit 48JZ
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters. All other operations should be performed
by trained service personnel. When working on air-conditioning
equipment, observe precautions in the literature, tags, and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 534–80083
Printed in U.S.A.
Form 48JZ-1SI
Pg 1
10-01
Replaces: New
Tab 1a 6a
Ensure electrical power supply provided for unit matches the
requirements listed on the unit rating plate.
Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide poisoning, fire, or
an explosion which can result in serious injury, death or unit
damage. Consult a qualified installer, service agency, or gas
supplier for information or assistance. The qualified installer
or agency must use only factory-authorized kits or accessories
when modifying this product.
INSPECT SHIPMENT
Inspect for shipping damage while unit is still on shipping pallet.
If unit appears to be damaged or is torn loose from its anchorage,
have it examined by transportation inspectors before removal.
Forward claim papers directly to transportation company. Manufacturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the
nearest distributor if any item is missing.
To prevent loss or damage, leave all parts in original packages
until installation.
Before performing service or maintenance operations on unit,
turn off gas supply to unit. Then turn off unit main power
switch and install lock-out tag. Electrical shock or explosion
could cause serious injury or death.
Step 2—PROVIDE UNIT SUPPORT
ROOF CURB
Recognize safety information. This is the safety-alert symbol .
When you see this symbol in instructions or manuals, be alert to
the potential for personal injury.
Install accessory roof curb in accordance with instructions shipped
with curb (See Fig. 4 for roof curb dimensions). Install insulation,
cant strips, roofing, and flashing. Ductwork must be attached to
curb.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasketing material supplied with the
roof curb. Improperly applied gasketing can also result in air leaks
and poor unit performance.
Curb should be level to within 1/4 in. This is necessary for unit
drain to function properly. Refer to accessory roof curb installation
instructions for additional information as required.
These instructions cover minimum requirements and conform to
existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residential construction practices. We require these instructions as a
minimum for a safe installation.
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of
4 in. thick with 2 in. above grade. The slab should be flush on the
compressor end of the unit (to allow condensate drain installation)
and should extend 2 in. on the three remaining sides of the unit. Do
not secure the unit to the slab except when required by local codes.
INTRODUCTION
The 48JZ unit (See Fig. 1) is a fully self-contained, combination
electric heat pump unit with gas-fired back-up heat designed for
outdoor installation (See Fig. 2 and 3 for unit dimensions). All unit
sizes have return and discharge openings for both horizontal and
downflow configurations, and are factory shipped with all downflow duct openings covered. Units may be installed either on a
rooftop, a cement slab, or directly on the ground if local codes
permit (See Fig. 4 for roof curb dimensions).
GROUND MOUNT
A
914-1371
(36”-54”)
927.57
(36”-52”)
B
Models with an N in the fifth position (available on single phase
only) of the model number are dedicated Low NOx units designed
for California installations.
DUCTS
SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB
1226.3
(48.28”)
NOTE: Low NOx requirements apply only to natural gas installations.
PLACE RIGGING STRAPS IN
BASEPAN SLOT (BELOW RIGGING HOLDS)
BEFORE RIGGING
These models meet the California maximum oxides of nitrogen
(NOx) emissions requirements of 40 nanograms/joule or less as
shipped from the factory and must be installed in California Air
Quality Management Districts where a Low NOx rule exists.
C99015
UNIT
48JZ
NOTE: In order for this unit to run as designed, you must install
with either Carrier’s Thermidistat™ control or Dual fuel thermostat. We recommend the Thermidistat™ control if using variable
speed blower motors.
024
030
036
042
048
060
RECEIVING AND INSTALLATION
Step 1—CHECK EQUIPMENT
MAXIMUM WEIGHT
lb
kg
UNIT
332
151
346
157
343
156
402
182
431
195
526
239
A
in.
48JZ
22.0
22.0
22.0
23.0
21.5
23.5
B
mm
in.
mm
558.5
558.5
558.5
584.2
546.1
596.9
14.50
15.30
15.30
16.3
16.3
16.3
368.3
388.6
388.6
414.0
414.0
414.3
Fig. 6—Suggested Rigging
IDENTIFY UNIT
The unit may be installed either on a slab or placed directly on the
ground if local codes permit. Place the unit on level ground
prepared with gravel for condensate discharge.
The unit model number and serial number are stamped on unit
identification / rating plate. Check this information against shipping papers and job data.
2
REQ’D CLEARANCES FOR OPERATION AND SERVICING. in. (mm)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Evaporator coil access side . . . . . . . . . . . . . . . . . . 36 (914)
Power entry side (except for NEC requirements) . . . . . . . . . 36 (914)
Unit top . . . . . . . . . . . . . . . . . . . . . . . . . . 48 (1219)
Side opposite ducts . . . . . . . . . . . . . . . . . . . . . 36 (914)
Duct panel . . . . . . . . . . . . . . . . . . . . . . . . 12 (304.8)*
*Minimum distances: If unit is placed less than 12 in. (304.8 mm) from wall
system, then the system performance may be compromised.
Top of unit . . . . . . . . . . . . . . . . . . . . . . . . . 14 (355.6)
Duct side of unit . . . . . . . . . . . . . . . . . . . . . . . 2 (50.8)
Side opposite ducts . . . . . . . . . . . . . . . . . . . . . 14 (355.6)
Bottom of unit . . . . . . . . . . . . . . . . . . . . . . . 0.50 (12.7)
Flue panel . . . . . . . . . . . . . . . . . . . . . . . . . 36 (914.4)
NEC REQ’D CLEARANCES. in. (mm)
Between units, power entry side . . . . . . . . . . . . . . 42 (1066.8)
Unit and ungrounded surfaces, power entry side . . . . . . . . . 36 (914)
Unit and block or concrete walls and other grounded
surfaces, control box side . . . . . . . . . . . . . . . . . 42 (1066.8)
LEGEND
CG - Center of Gravity
COND - Condenser
EVAP - Evaporator
NEC - National Electrical Code
REQ'D - Required
Note: Dimensions are in in. (mm)
C99017
UNIT
ELECTRICAL CHARACTERISTICS
48JZ024-040
208/230-1-60
lb
kg
UNIT HEIGHT
IN. (MM)
″A″
310.0
141.0
35.02 (889.5)
UNIT WEIGHT
CENTER OF GRAVITY
IN. (MM)
X
Y
Z
22.0 (558.8)
14.5 (368.3)
16.0 (406.4)
48JZ030-040/060
208/230-1-60
324.0
147.0
37.02 (940.3)
22.0 (558.8)
15.3 (387.4)
17.6 (447.0)
48JZ036-060/090
208/230-1-60, 208/230-3-60
321.0
145.6
37.02 (940.3)
22.0 (558.8)
15.3 (387.4)
16.5 (419.1)
Fig. 2—48JZ024-036 Unit Dimensions
Step 3—FIELD FABRICATE DUCTWORK
Secure all ducts to roof curb and building structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications, unit is provided with flanges on the horizontal
openings. All ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accordance with applicable
codes.
Ducts passing through an unconditioned space must be insulated
and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be
ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork. Cabinet
return-air static shall not exceed -.25 in. wg.
3
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
REQUIRED CLEARANCE TO COMBUSTIBLE MATL.
in. [mm]
EVAP. COIL ACCESS SIDE..............................................................36.00 [914.0]
POWER ENTRY SIDE......................................................................36.00 [914.0]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .........................................................................................36.00 [914.0]
SIDE OPPOSITE DUCTS ................................................................36.00 [914.0]
DUCT PANEL ...................................................................................12.00 [304.8] *
in. [mm]
TOP OF UNIT...................................................................................14.00 [355.6]
DUCT SIDE OF UNIT.........................................................................2.00 [50.8]
SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]
BOTTOM OF UNIT .............................................................................0.50 [12.7]
FLUE PANEL ....................................................................................36.00 [914.4]
NEC. REQUIRED CLEARANCES.
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
MILLIMETERS [IN.]
BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE ...36.00 [914.0]
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]
FLUE HOOD
C99074
CENTER OF GRAVITY
IN. (MM)
UNIT
ELECTRICAL CHARACTERISTICS
lb
kg
UNIT HEIGHT
IN. (MM)
″A″
X
Y
Z
48JZ042-060/090
208/230-1-60, 208/230-3-60
380
172
40.98 (1040.9)
23.0 (584.2)
16.3 (412.8)
16.6 (421.6)
48JZ048-090/115/130
208/230-1-60, 208/230-3-60
409
186
40.98 (1040.9)
21.5 (546.1)
16.6 (422.1)
18.0 (457.2)
48JZ060-090/115/130
208/230-1-60, 208/230-3-60
504
229
42.98 (1091.1)
23.5 (596.9)
16.3 (412.8)
17.6 (447.0)
UNIT WEIGHT
Fig. 3—48JZ042-060 Unit Dimensions
Step 4—PROVIDE CLEARANCES
The required minimum operating and service clearances are shown
in Fig. 2 and 3. Adequate combustion, ventilation and outdoor coil
air must be provided in accordance with section 5.3, Air for
Combustion and Ventilation, of the National Fuel Gas Code ANSI
(American National Standards Institute) Z223.1 or applicable
provisions of local building code. In Canada, follow sections 7.2,
7.3, or 7.4 or Can/CGA. (Canadian Gas Association) B149
Installation Codes or applicable provisions of local building code.
4
HVAC unit
base
HVAC unit
base
Screw
(NOTE A)
Screw
(NOTE A)
Gasketing
inner flange*
*Gasketing
outer flange
Gasketing
inner flange*
*Gasketing
outer flange
Wood nailer*
Flashing field
supplied
Wood nailer*
Flashing field
supplied
Roofcurb*
Insulation (field
supplied)
Roofing material
field supplied
Roofing material
field supplied
Duct work
field supplied
Cant strip
field supplied
Roofcurb*
Insulation (field
supplied)
Duct work
field supplied
Cant strip
field supplied
Roof
Roof
*Provided with roofcurb
*Provided with roofcurb
Roof Curb for Small Cabinet
Roof Curb for Large Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used.
Note A: When unit mounting screw is used,
retainer bracket must also be used.
Supply opening
(B x C)
B Typ.
44 5/16"
(1125.5mm)
D
C Typ.
R/A
A
Insulated
deck pan
S/A
Gasket around
duct
Insulated
deck pan
Short
Support
Gasket around
outer edge
Long
Support
Return opening
(B X C)
C00076
UNIT SIZE
48JZ024-036
48JZ042-060
ODS CATALOG NUMBER
CPRFCURB006A00
CPRFCURB007A00
CPRFCURB008A00
CPRFCURB009A00
A
IN. (MM)
8 (203)
14 (356)
8 (203)
14 (356)
B
IN. (MM)
11(279)
11(279)
16 3/16 (411)
16 3/16 (411)
C
IN. (MM)
16 1/2 (419)
16 1/2 (419)
17 3/8 (441)
17 3/8 (441)
D
IN. (MM)
28 3/4 (730)
28 3/4 (730)
40 1/4 (1022)
40 1/4 (1022)
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
3. Dimensions in ( ) are in millimeters.
4. Roof curb is made of 16-gage steel.
5. Table lists only the dimensions, per part number, that have changed.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Insulated panels: 1-in. thick fiberglass 1 lb density.
8. Dimensions are in inches.
9. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or
seismic conditions. This bracket is available through Micrometl.
→
Fig. 4—Roof Curb Dimensions
corner or under an overhead obstruction. The minimum clearance
under a partial overhang (such as a normal house overhang) is
48-in. above the unit top. The maximum horizontal extension of a
partial overhang must not exceed 48-in..
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting, tile, or other combustible materials. The unit may be
installed on wood flooring or on Class A, B, or C roof covering
materials.
Do not restrict outdoor coil airflow. An air restriction at either
the outdoor-air inlet or the fan discharge can be detrimental to
compressor life.
The outdoor fan pulls air through the outdoor coil and discharges
it through the top cover. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a
5
1
2
y
4
3
x
Corner
Corner
Corner
Corner
Weight
Weight
Weight
Weight
1
2
3
4
52
88
49
121
60.5
57.3
98.0
108.2
→
036
321
Model 48JZ
Model 48JZ
C00070
CORNER WEIGHTS (SMALL CABINET)
Unit
024
030
Total Weight
310
324
61.0
57.8
99.5
102.7
CORNER WEIGHTS (LARGE CABINET)
Unit
042
048
Total Weight
380
409
Corner
Corner
Corner
Corner
Weight
Weight
Weight
Weight
1
2
3
4
83
52
115
130
108
48
125
128
060
504
105
76
130
193
Fig. 5—48JZ Corner Weights
Step 5—RIG AND PLACE UNIT
Prime the trap with water. Connect a drain tube – using a minimum
of 3/4-in. PVC or 3/4-in. copper pipe (all field-supplied) – at the
outlet end of the 2-in. trap. Do not undersize the tube. Pitch the
drain tube downward at a slope of at least 1-in. for every 10 ft of
horizontal run. Be sure to check the drain tube for leaks.
When installing the unit on a rooftop, be sure the roof will
support the additional weight.
1” (25mm) MIN.
Use spreader bars or crate top when rigging the unit. The units
must be rigged for lifting (See Fig. 6). Refer to Table 1 for
operating weight. Use extreme caution to prevent damage when
moving the unit. Unit must remain in an upright position during all
rigging and moving operations.The unit must be level for proper
condensate drainage; therefore, the ground-level pad or accessory
roof curb must be level before setting the unit in place. When a
field-fabricated support is used, be sure that the support is level
and properly supports the unit. Lifting point should be directly
over the center of gravity for the unit.
TRAP
OUTLET
2” (50mm) MIN.
C99013
Fig. 7—Condensate Trap
Step 6—CONNECT CONDENSATE DRAIN
Step 7—INSTALL FLUE HOOD
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
The flue hood assembly is shipped screwed to the coil panel in the
indoor blower compartment. Remove the service access panel to
locate the assembly.
Model 48JZ disposes of condensate water through a 3/4 in. NPT
fitting which exits through the compressor access panel (See Fig.
2 and 3 for location).
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in groundlevel installations. Install a field-supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain condensate
connection to prevent the drain from overflowing (See Fig. 7).
Prime the trap with water. When using a gravel apron, make sure
it slopes away from the unit.
The venting system is designed to ensure proper venting. The
flue hood assembly must be installed as indicated in this
section of the unit installation instructions.
Install the flue hood as follows:
1. This installation must conform with local building codes and
with the National Fuel Gas Code (NFGC), ANSI Z223.1 (in
Canada, CAN/CGA B149.1, and B149.2) or NFPA (National
Fire Protection Association) latest revision. Refer to Provincial and local plumbing or wastewater codes and other
applicable local codes.
If the installation requires draining the condensate water away
from the unit, install a 2-in. trap at the condensate connection to
ensure proper drainage (See Fig. 7). Make sure that the outlet of
the trap is at least 1 in. lower than the drain condensate connection.
This prevents the drain from overflowing.
2. Remove flue hood from shipping location (inside the blower
compartment). Place vent cap assembly over flue panel. Orient
6
Table 1—Physical Data—Unit 48JZ
UNIT SIZE 48JZ
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb.)
COMPRESSORS
Quantity
REFRIGERANT (R-410A)
Quantity (lb.)
REFRIGERANT METERING DEVICE
Orifice ID (in.)
AccuRater Piston
Orifice OD (in.)
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
OUTDOOR FAN
Nominal Cfm
Diameter (in.)
Motor HP (Rpm)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
INDOOR BLOWER
(Standard PSC Motor)
Nominal Airflow (Cfm)
Size (in.)
Motor (HP)
FURNACE SECTION*
Burner Orifice No. (Qty...Drill Size)
Natural Gas
Burner Orifice No. (Qty...Drill Size)
Propane Gas
HIGH-PRESSURE SWITCH (psig)
Cut-out
Reset (Auto)
LOSS-OF-CHARGE /
LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cut-out
Reset (auto)
RETURN-AIR FILTERS (in.)†
Throwaway
024040
2
310
030040
2-1/2
324
030060
2-1/2
324
036060
3
321
Scroll
1
036090
3
321
042060
3-1/2
380
042090
3-1/2
380
7.0
8.9
8.9
9.3
9.3
9.5
9.5
0.061
0.061
0.061
0.067
0.067
0.073
0.073
0.032 (2)
0.040 (2)
0.040 (2)
0.040 (2)
0.040 (2)
0.038 (2)
0.038 (2)
2...17
8.5
2...17
10.3
2...17
10.3
2...17
10.3
2...17
10.3
2...17
13.5
2...17
13.5
2350
22
1/8 (825)
2350
22
1/8 (825)
2350
22
1/8 (825)
2800
22
1/4 (1100)
2800
22
1/4 (1100)
2500
22
1/8 (825)
2500
22
1/8 (1100)
3...15
3.7
3...15
3.7
3...15
3.7
4...15
3.7
4...15
3.7
3...15
4.7
3...15
4.7
800
10 X 10
1/4
1000
10 X 10
1/4
1000
10 X 10
1/4
1200
10 X 10
1/2
1200
10 X 10
1/2
1400
11 X 10
1/2
1400
11 X 10
1/2
2...44
2...50
2...44
2...50
2...38
2...46
2...38
2...46
3...38
3...46
2...38
2...46
3...38
3...46
20 x 24 x 1
24 x 30 x 1
24 x 30 x 1
610 +/- 15
420 +/- 25
20 +/- 5
45 +/- 10
20 x 20 x 1
20 x 20 x 1
20 x 24 x 1
20 x 24 x 1
* Based on altitude of 0 to 2000 ft.
† Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft/minute for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
When installing the gas supply line, observe local codes pertaining
to gas pipe installations. Refer to the NFGC ANSI Z223.1 NFPA
54 latest edition (in Canada, CAN/CGA B149.1, latest edition). In
the absence of local building codes, adhere to the following
pertinent recommendations:
screw holes in vent cap with holes in the flue panel.
3. Secure flue hood to flue panel by inserting a single screw on
the right side and the left side of the hood.
Step 8—INSTALL GAS PIPING
The gas supply pipe enters the unit through the access hole
provided. The gas connection to the unit is made to the 1/2-in. FPT
gas inlet on the manual shutoff or gas valve.
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in. in
every 15 ft to prevent traps. Grade all horizontal runs
downward to risers. Use risers to connect to heating section
and to meter.
Install a gas supply line that runs to the heating section. Refer to
Table 2 and the NFGC for gas pipe sizing. Do not use cast-iron
pipe. It is recommended that a black iron pipe is used. Check the
local utility for recommendations concerning existing lines. Size
gas supply piping for 0.5 in. wg maximum pressure drop. Never
use pipe smaller than the 1/2-in. FPT gas inlet on the unit gas
valve.
2. Protect all segments of piping system against physical and
thermal damage. Support all piping with appropriate straps,
hangers, etc. Use a minimum of one hanger every 6 ft. For
pipe sizes larger than 1/2 in., follow recommendations of
national codes.
3. Apply joint compound (pipe dope) sparingly and only to male
threads of joint when making pipe connections. Use only pipe
dope that is resistant to action of liquefied petroleum gases as
specified by local and/or national codes. Never use Teflon
tape.
For natural gas applications, the gas pressure at unit gas connection
must not be less than 4.0 in. wg or greater than 13 in. wg while the
unit is operating. For propane applications, the gas pressure must
not be less than 7.0 in. wg or greater than 13 in. wg at the unit
connection.
An 1/8-in. NPT plugged tapping, accessible for test gage connection, must be installed immediately upstream of the gas supply
connection to the gas valve.
4. Install sediment trap in riser leading to heating section. (See
Fig. 8). This drip leg functions as a trap for dirt and
condensate.
7
Table 1—Physical Data—Unit 48JZ (Continued)
UNIT SIZE 48JZ
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb.)
COMPRESSORS
Quantity
REFRIGERANT (R-410A)
Quantity (lb.)
REFRIGERANT METERING DEVICE
Orifice ID (in.)
AccuRater
Orifice OD (in.)
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
OUTDOOR FAN
Nominal Cfm
Diameter (in.)
Motor HP (Rpm)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
INDOOR BLOWER
(Standard PSC Motor)
Nominal Airflow (Cfm)
Size (in.)
Motor (HP)
FURNACE SECTION*
Burner Orifice No. (Qty...Drill Size)
Natural Gas
Burner Orifice No. (Qty...Drill Size)
Propane Gas
HIGH-PRESSURE SWITCH (psig)
Cut-out
Reset (Auto)
LOSS-OF-CHARGE /
LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cut-out
Reset (auto)
RETURN-AIR FILTERS (in.)†
Throwaway
048090
4
409
048115
4
409
048130
4
409
060090
5
504
060115
5
504
060130
5
504
Scroll
1
10.6
10.6
10.6
12.4
12.4
12.4
0.076
0.076
0.076
0.088
0.088
0.088
0.046 (2)
0.046 (2)
0.046 (2)
0.052 (2)
0.052 (2)
0.052 (2)
2...17
13.5
2...17
13.5
2...17
13.5
2...17
15.4
2...17
15.4
2...17
15.4
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
4...15
4.7
4...15
4.7
4...15
4.7
4...15
5.7
4...15
5.7
4...15
5.7
1600
11 X 10
1/2
1600
11 X 10
1/2
1600
11 X 10
1/2
1750
11 X 10
1.0
1750
11 X 10
1.0
1750
11 X 10
1.0
3...38
3...46
3...33
3...42
3...31
3...41
3...38
3...46
3...33
3...42
3...31
3...41
24 x 30 x 1
24 x 30 x 1
24 x 30 x 1
610 +/- 15
420 +/- 25
20 +/- 5
45 +/- 10
24 x 30 x 1
24 x 30 x 1
24 x 30 x 1
* Based on altitude of 0 to 2000 ft.
† Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300
ft/minute for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
Table 2—Maximum Gas Flow Capacity*
NOMINAL
IRON PIPE,
SIZE
(IN.)
1/2
3/4
1
1 1/4
1 1/2
LENGTH OF PIPE, FT†
INTERNAL
DIAMETER
(IN.)
10
20
30
40
50
60
70
80
90
100
125
150
175
200
.622
.824
1.049
1.380
1.610
175
360
680
1400
2100
120
250
465
950
1460
97
200
375
770
1180
82
170
320
600
990
73
151
285
580
900
66
138
260
530
810
61
125
240
490
750
57
118
220
460
690
53
110
205
430
650
50
103
195
400
620
44
93
175
360
550
40
84
160
325
500
—
77
145
300
460
—
72
135
280
430
* Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-in. wg (based on a 0.60 specific gravity gas). Refer to Table, National
Fire Protection Association NFPA 54.
† This length includes an ordinary number of fittings.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig. Pressure test
the gas supply piping system at pressures equal to or less than 0.5
psig. The unit heating section must be isolated from the gas piping
system by closing the external main manual shutoff valve and
slightly opening the ground-joint union.
5. Install an accessible, external, manual main shutoff valve in
gas supply pipe within 6 ft of heating section.
6. Install ground-joint union close to heating section between
unit manual shutoff and external manual main shut-off valve.
7. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping to
unit.
8
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base (See Fig. 9 & 10).
IN
TEE
OUT
NIPPLE
CAP
C99020
Fig. 8—Sediment Trap
Unstable operation may occur when the gas valve and
manifold assembly are forced out of position while connecting improperly-routed rigid gas piping to the gas valve. Use
a backup wrench on the square neck of the inlet side of the
gas valve when making connection to avoid strain on, or
distortion of, the gas control piping.
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
C99011
Fig. 9—Supply and Return Duct Opening
If a flexible conductor is required or allowed by the authority
having jurisdiction, black iron pipe shall be installed at the
gas valve and shall extend a minimum of 2 in. outside the unit
casing.
Never use a match or other open flame when checking for gas
leaks. Never purge gas line into combustion chamber. Failure
to follow this warning could result in an explosion causing
serious injury or death.
8. Check for gas leaks at the field-installed and factory-installed
gas lines after all piping connections have been completed.
Use soap-and-water solution (or method specified by local
codes and/or regulations).
DUCT COVERS REMOVED
Step 9—INSTALL DUCT CONNECTIONS
C99012
The unit has duct flanges on the supply- and return-air openings on
the side and bottom of the unit. For downshot applications, the
ductwork connects to the roof curb (See Fig. 2 and 3 for
connections sizes and locations).
Fig. 10—Vertical Duct Cover Removed
4. If unit ductwork is to be attached to vertical opening flanges
on the unit base (jackstand applications only), do so at this
time.
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE
Collect ALL screws that were removed. Do not leave screws
on rooftop as permanent damage to the roof may occur.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lock-out tag.
Electrical shock could cause serious injury or death.
1. Open all electrical disconnects before starting any service
work.
5. It is recommended that the base insulation around the perimeter of the vertical return-air opening be secured to the base
with aluminum tape. Applicable local codes may require
aluminum tape to prevent exposed fiberglass.
2. Remove horizontal duct covers to access bottom return and
supply knockout panels.
6. Cover both horizontal duct openings with the provided duct
covers. Ensure opening is air- and watertight.
9
7. After completing unit conversion, perform all safety checks
and power up unit.
NOTE: The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence-type air conditioning and ventilating systems, NFPA
90A or residence-type, NFPA 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for horizontal duct installation (by removing
duct covers).
2. Select and size ductwork, supply-air registers, and return-air
grilles according to American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendations.
3. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt duct
size increases or decreases or performance may be affected.
4. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned space,
and use vapor barrier in accordance with latest issue of Sheet
Metal and Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors of America
(ACCA) minimum installation standards for heating and air
conditioning systems. Secure all ducts to building structure.
5. Use flexible transition between rigid ductwork and unit to
prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weathertight and airtight seal.
6. All units must have field-supplied filters or accessory filter
rack installed in the return-air side of the unit. Recommended
sizes for filters are shown in Table 1.
7. Flash, weatherproof, and vibration-isolate all openings in
building structure in accordance with local codes and good
building practices.
Step 10—INSTALL ELECTRICAL CONNECTIONS
Failure to follow these precautions could result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA 70 (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connections must be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduit, etc. On
3-phase units, ensure phases are balanced within 2 percent.
Consult local power company for correction of improper
voltage and/or phase imbalance.
HIGH-VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a fieldsupplied, waterproof, disconnect switch mounted at, or within
sight from, the unit. Refer to the unit rating plate for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for
wire sizing. (See Table 3 for electrical data.)
The field-supplied disconnect switch box may be mounted on the
unit over the high-voltage inlet hole when the standard power and
low-voltage entry points are used (See Fig. 2 and 3 for acceptable
location).
See unit wiring label and Fig. 11 for reference when making high
voltage connections. Proceed as follows to complete the highvoltage connections to the unit.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of an electrical wire connected to the unit ground lug
in the control compartment, or conduit approved for electrical
ground when installed in accordance with NEC (National
Electrical Code) ANSI/NFPA 70 (latest edition) and local
electrical codes. In Canada, follow Canadian Electrical Code
CSA (Canadian Standards Association) C22.1 and local
electrical codes. Failure to adhere to this warning could result
in serious injury or death.
POWER
SUPPLY
GND
FIELD-SUPPLIED
FUSED DISCONNECT
CONTROL BOX
DHUM
WHT(W1)
YEL(Y)
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
GRN(G)
RED(R)
BRN(C)
ORN(O)
W/W1
Y/Y2
THERMOSTAT
(THERMIDISTAT ™ )
G
R
C
O/W2
SPLICE BOX
FIELD CONTROL - VOLTAGE WIRING
FIELD HIGH - VOLTAGE WIRING
C01110
Fig. 11—High- and Control-Voltage Connections
Single phase units:
1. Run the high-voltage (L1, L2) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
10
Table 3—Electrical Data—Unit 48JZ
UNIT
SIZE
48JZ
024
030
036
042
048
060
V-PH-HZ
208/230–1–60
208/230–1–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
VOLTAGE
RANGE
COMPRESSOR
OUTDOOR FAN
MOTOR
INDOOR FAN
MOTOR
POWER SUPPLY
Min
Max
RLA
LRA
FLA
FLA
MCA
187
187
187
187
187
187
187
187
187
187
253
253
253
253
253
253
253
253
253
253
13.5
15.9
16.9
12.2
22.4
15.4
21.3
14.7
27.6
19.2
61.0
73.0
83.0
77.0
105.0
88.0
109.0
91.0
158.0
137.0
0.9
0.9
1.6
1.6
0.9
0.9
1.6
1.6
1.5
1.5
2.0
2.1
4.1
4.1
4.1
4.1
4.1
4.1
6.2
6.2
19.8
22.9
26.8
21.0
33.0
24.3
32.3
24.1
42.2
31.7
3. Locate the black and yellow wires connected to the line side
of the contactor.
MAX FUSE
OR CKT BKR
30
35
40
30
50
35
50
35
60
40
Run the low-voltage leads from the thermostat, through the inlet
hole, and into unit low-voltage splice box.
Locate five 18-gage wires leaving control box. These low-voltage
connection leads can be identified by the colors red, green, yellow,
brown, and white (See Fig. 11). Ensure the leads are long enough
to be routed into the low-voltage splice box (located below right
side of control box). Stripped yellow wire is located in connection
box. Route leads through hole in bottom of control box and make
low-voltage connections (See Fig. 11). Secure all cut wires, so that
they do not interfere with operation of unit.
HEAT ANTICIPATOR SETTING
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the W and R terminals to determine the exact
required setting.
NOTE: For thermostat selection purposes, use 0.18 amp for the
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discomfort to the occupants of the conditioned space, and inefficient
energy utilization; however, the required setting may be changed
slightly to provide a greater degree of comfort for a particular
installation.
TRANSFORMER PROTECTION
The transformer is of the energy-limiting type. It is set to
withstand a 30-sec. overload or shorted secondary condition.
4. Connect L1 to black wire on connection 11 of the compressor
contactor.
5. Connect L2 to yellow wire on connection 23 of the compressor contactor.
Three-phase units:
1. Run the high-voltage (L1, L2, L3) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the lines side
of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 13 of the
compressor contactor.
6. Connect field wire L3 to Blue wire from compressor.
SPECIAL PROCEDURES FOR 208-V OPERATION
Before making any wiring changes, make sure the gas supply
is switched off first. Then switch off the power supply to the
unit and install lock-out tag. Electrical shock can cause
serious injury or death.
CONTROL VOLTAGE CONNECTIONS
NOTE: This unit must be installed with either a Thermidistat™
or Dual fuel thermostat for proper system operation.
Do not use any type of power-stealing thermostat (no Common
“C” connection at Stat). Unit control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated
(35 C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft from the unit (as measured along the control
voltage wires), use no. 16 AWG color-coded, insulated (35 C
minimum) wires.
Dual fuel thermostat or Thermidistat™ control is required for
proper operation of the dual fuel heat pump unit. Be sure to follow
the instructions supplied with the thermostat and control.
Standard Connection
Remove knockout hole located in the flue panel adjacent to the
control access panel (See Fig. 2 and 3). Remove the rubber
grommet from the installer’s packet (included with unit) and install
grommet in the knockout opening. Provide a drip loop before
running wire through panel.
11
EXAMPLE: Supply voltage is 230-3-60.
AB = 232 v
BC = 227 v
AC = 225 v
LEGEND
FLA
LRA
MCA
CKT BKR
RLA
—
—
—
—
—
Full Load Amps
Locked Rotor Amps
Minimum Circuit Amps
Circuit Breaker
Rated Load Amps
232 + 227 + 225
3
684
=
3
= 228
®
Average Voltage =
NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse . Canadian units may be
fuse or circuit breaker.
.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
Determine maximum deviation from average voltage.
(AB) 232 - 228 = 4 v
(BC) 228 - 227 = 1 v
(AC) 228 - 225 = 3 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
% Voltage Imbalance = 100 x
228
= 1.75%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
% Voltage imbalance
= 100 x
max voltage deviation from average voltage
average voltage
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
C01106
Table 4—Legend
PRE-START-UP
b. Inspect for oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak.
c. Leak test all refrigerant tubing connections using electronic
leak detector, halide torch, or liquid-soap solution. If a
refrigerant leak is detected, see the Check for Refrigerant
Leaks section.
Failure to observe the following warnings could result in
serious injury or death:
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power to
unit unless compressor terminal cover is in place and
secured.
3. Do not remove compressor terminal cover until all electrical sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected around compressor terminals.
5. Never attempt to repair brazed connection while refrigerant
system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure. To remove a
component, wear protective goggles and proceed as follows:
a. Shut off gas supply and then electrical power to unit and
install lock-out tag.
b. Relieve and recover all refrigerant from system using
both high- and low-pressure ports.
c. Cut component connecting tubing with tubing cutter and
remove component from unit.
d. Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch flame.
d. Inspect all field- and factory-wiring connections. Be sure
that connections are completed, not rubbing against any
sharp sheet metal edges or refrigerant tubing and are tight.
e. Inspect coil fins. If damaged during shipping and handling,
carefully straighten fins with a fin comb.
4. Verify the following conditions:
Do not purge gas supply into the combustion chamber. Do not
use a match or other open flame to check for gas leaks.
Failure to follow this warning could result in an explosion
causing serious injury or death.
a. Make sure gas line is free of air. Before lighting the unit for
the first time, perform the following with the gas valve in
the ‘‘OFF’’ position:
If the gas supply pipe was not purged before connecting
the unit, it will be full of air. It is recommended that the
ground joint union be loosened, and the supply line be
allowed to purge until the odor of gas is detected. Never
purge gas lines into a combustion chamber. Immediately
upon detection of gas odor, retighten the union. Allow 5
minutes to elapse, then light unit.
Proceed as follows to inspect and prepare the unit for initial
startup:
1. Remove access panel.
b. Make sure that outdoor fan blade is correctly positioned in
fan orifice. Leading edge of outdoor fan blade should be
1/2 in. maximum from fan orifice.
2. Read and follow instructions on all WARNING, CAUTION,
and INFORMATION labels attached to, or shipped with, unit.
c. Ensure fan hub is 1/8 in. maximum from motor housing
(See Fig. 12).
3. Make the following inspections:
d. Make sure that air filter(s) is in place.
a. Inspect for shipping and handling damages such as broken
lines, loose parts, disconnected wires, etc.
e. Make sure that condensate drain trap is filled with water to
ensure proper drainage.
12
FAN GRILLE
MOTOR
BURNER FLAME
BURNER
1/8" (3.175mm) MAX BETWEEN
MOTOR AND FAN HUB
MOTOR SHAFT
C99009
Fig. 12—Fan Blade Clearance
MANIFOLD
f. Make sure that all tools and miscellaneous loose parts have
been removed.
5. Compressors are internally spring mounted. Do not loosen or
remove compressor hold-down bolts.
C99021
Fig. 14—Monoport Burner
6. Each unit has 2 schrader-type ports, one low-side located on
the suction line, and one high-side located on the compressor
discharge line. Be sure that caps on these ports are tight.
5. Charge unit with R-410A refrigerant, using a volumetriccharging cylinder or accurate scale. Refer to unit rating plate
for required charge. Be sure to add extra refrigerant to
compensate for internal volume of filter drier.
7. This unit has High Flow Valves located on the compressor hot
gas and suction tubes. Large black plastic caps with O-rings
distinguish these valves. These valves cannot be accessed for
service in the field. Ensure the plastic caps are in place and
tight or the possibility of a refrigerant leak could occur.
Step 2—START-UP HEAT AND MAKE ADJUSTMENTS
Complete the required procedures given in the Pre-Start-Up
section before starting the unit.
NOTE: This unit is factory equipped with natural gas orifices.
Do not jumper any safety devices when operating the unit.
Make sure that burner orifices are properly aligned. Unstable
operation may occur when the burner orifices in the manifold are
misaligned.
Follow the lighting instructions on the heating section operation
label (located inside the burner or blower access door) to start the
heating section.
NOTE: Make sure that gas supply has been purged, and that all
gas piping has been checked for leaks.
CHECK HEATING CONTROL
Start and check the unit for proper cooling control operation as
follows (see furnace lighting instructions located inside burner or
blower access panel):
MANIFOLD
1. Place room thermostat SYSTEM switch in the HEAT position
and the fan switch is placed in AUTO. position. Verify that the
outdoor air sensor setting is above the outdoor temperature.
PIPE PLUG
C99019
Fig. 13—Burner Assembly
2. Set the heating temperature control of the thermostat above
room temperature.
START-UP
3. The induced-draft motor will start.
Step 1—CHECK FOR REFRIGERANT LEAKS
4. After a call for heating, the main burner should light within 5
sec. If the burners do not light, there is a 22-sec. delay before
another 5-sec. try. If the burners still do not light, this
sequence is repeated. If the burners do not light within 15
minutes from the initial call for heat, there is a lockout. To
reset the control, break the 24-v power to W.
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system pressure has
been relieved and reclaimed from both high- and low-pressure
ports.
5. The indoor fan will turn on 45 sec. after the flame has been
established. The indoor fan will turn off 45 sec. after the
thermostat has been satisfied.
2. Repair leak following Refrigerant Service procedures.
NOTE: Install a bi-flow filter drier suitable for use with Puron®
(R-410A) whenever the system has been opened for repair.
CHECK GAS INPUT
Check gas input and manifold pressure after unit start-up (See
Table 5). If adjustment is required proceed as follows:
3. Add a small charge of R-410A refrigerant vapor to system and
leak-test unit.
4. Recover refrigerant and evacuate system to 500 Microns if
additional leaks are not found.
•
13
The rated gas inputs shown in Table 5 are for altitudes from sea
level to 2000 ft above sea level. These inputs are based on
C01099
Fig. 15—208/230-1-60 Wiring Diagram, Unit 48JZ
natural gas with a heating value of 1050 Btu/ft3 at 0.65 specific
gravity, or propane gas with a heating value of 2500 Btu/ft3 at
1.5 specific gravity.
•
14
For elevations above 2000 ft, reduce input 4 percent for each
1000 ft above sea level.
C01100
Fig. 16—208/230-3-60 Wiring Diagram, Units 48JZ
•
When the gas supply being used has a different heating value or
specific gravity, refer to national and local codes, or contact
your distributor to determine the required orifice size.
15
C01101
Fig. 17—208/230-1-60 ICM FIOP Wiring Diagram, Unit 48JZ
16
Table 5—Heating Inputs
HEATING
INPUT
(BTUH)*
NUMBER
OF
ORIFICES
40,000
60,000
90,000
115,000
130,000
2
2
3
3
3
Min
4.0
4.0
4.0
4.0
4.0
GAS SUPPLY PRESSURE
(IN. WG)
Natural
Propane†
Max
Min
13.0
4.0
13.0
4.0
13.0
4.0
13.0
4.0
13.0
4.0
MANIFOLD
PRESSURE
(IN. WG)
Max
13.0
13.0
13.0
13.0
13.0
Natural
3.5
3.5
3.5
3.5
3.5
Propane†
3.5
3.5
3.4
3.7
3.5
† When a unit is converted to propane, different size orifices must be used. See separate, natural-to-propane conversion kit instructions.
* Based on altitudes from sea level to 2000 ft above sea level. For altitudes above 2000 ft, reduce input rating 4 percent for each 1000 ft above sea level. In Canada,
from 2000 ft above sea level to 4500 ft above sea level, de-rate the unit 10 percent.
1. Remove cover screw over regulator adjustment screw on gas
valve.
2. Turn regulator adjustment screw clockwise to increase gas
input, or turn regulator adjustment screw counterclockwise to
decrease input. Manifold pressure must be between 3.4 and
3.6 in. wg. Unsafe operation of the unit may result if manifold
pressure is outside this range. Personal injury or unit damage
may result.
These units are designed to consume the rated gas inputs
using the fixed orifices at specified manifold pressures as
shown in Table 5. DO NOT RE-DRILL THE ORIFICES
UNDER ANY CIRCUMSTANCES.
ADJUST GAS INPUT
The gas input to the unit is determined by measuring the gas flow
at the meter or by measuring the manifold pressure. Measuring the
gas flow at the meter is recommended for natural gas units. The
manifold pressure must be measured to determine the input of
propane gas units.
Unsafe operation of the unit may result if manifold pressure
is outside this range. Serious injury , death or unit damage
may result.
Measure Gas Flow (Natural Gas Units)
Minor adjustment to the gas flow can be made by changing the
manifold pressure. The manifold pressure must be maintained
between 3.4 and 3.6 in. wg. If larger adjustments are required,
change main burner orifices following the recommendations of
national and local codes.
3. Replace cover screw cap on gas valve.
4. Turn off gas supply to unit. Remove manometer from pressure
tap and replace pipe plug on gas valve. Turn on gas to unit and
check for leaks.
Measure Manifold Pressure (Propane Units)
The main burner orifices on a propane gas unit are sized for the
unit rated input when the manifold pressure reading matches the
level specified in Table 5.
Proceed as follows to adjust gas input on a propane gas unit:
1. Turn off gas to unit.
2. Remove pipe plug on manifold and connect manometer (See
Fig. 13).
3. Turn on gas to unit.
4. Initiate a call for Gas Heating.
5. Remove cover screw over regulator adjustment screw on gas
valve.
6. Adjust regulator adjustment screw to the correct manifold
pressure, as specified in Table 5. Turn adjusting screw
clockwise to increase manifold pressure, or turn adjusting
screw counterclockwise to decrease manifold pressure.
7. Replace cover screw.
8. Turn off gas to unit. Remove manometer from pressure tap.
Replace pipe plug on gas valve, then turn on gas to unit. Check
for leaks.
CHECK BURNER FLAME
With burner access panel removed, observe the unit heating
operation. Watch the burner flames to see if they are light blue and
soft in appearance, and that the flames are approximately the same
for each burner. Propane will have blue flame with yellow tips
(See Fig. 14). Refer to the Maintenance section for information on
burner removal.
NOTE: All other appliances that use the same meter must be
turned off when gas flow is measured at the meter.
Proceed as follows:
1. Turn off gas supply to unit.
2. Remove pipe plug on manifold (See Fig. 13) and connect
manometer. Turn on gas supply to unit.
3. Initiate a call for Gas Heating.
4. Record number of seconds for gas meter test dial to make one
revolution.
5. Divide number of seconds in Step 3 into 3600 (number of
seconds in one hour).
6. Multiply result of Step 4 by the number of cu ft shown for one
revolution of test dial to obtain cu ft of gas flow per hour.
7. Multiply result of Step 5 by Btu heating value of gas to obtain
total measured input in Btuh. Compare this value with heating
input shown in Table 5. (Consult the local gas supplier if the
heating value of gas is not known.)
EXAMPLE: Assume that the size of test dial is 1 cu ft, one
revolution takes 32 sec., and the heating value of the gas is 1050
Btu/ft3. Proceed as follows:
1. 32 sec. to complete one revolution.
2. 3600 ÷ 32 = 112.5.
3. 112.5 x 1 =112.5 ft3 of gas flow/hr.
4. 112.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change in the
manifold pressure is required.
Observe manifold pressure and proceed as follows to adjust gas
input:
17
Table 6—Air Delivery (CFM) at Indicated Temperature Rise and Rated Heating Input
HEATING
INPUT
(BTUH)
40,000
60,000
90,000
115,000
130,000
TEMPERATURE RISE °F
20
25
30
35
40
45
50
55
60
65
70
1500
2250
—
—
—
1200
1800
—
—
—
1000
1500
2250
—
—
857
1286
1929
2464
2786
750
1125
1688
2156
2438
667
1000
1500
1917
2167
600
900
1350
1725
1950
545
818
1227
1568
1773
500
750
1125
1438
1625
—
692
1038
1327
1500
—
—
964
1232
—
NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.
Table 7—LED Indications
AIRFLOW AND TEMPERATURE RISE
The heating section for each size unit is designed and approved for
heating operation within the temperature-rise range stamped on the
unit rating plate.
ERROR CODE
Normal Operation
Hardware Failure
Fan On/Off Delay Modified
Limit Switch Fault
Flame Sense Fault
Four Consecutive Limit Switch Faults
Ignition Lockout Fault
Induced-Draft Motor Fault
Rollout Switch Fault
Internal Control Fault
Temporary one hour automatic
reset fault (See note 2)
Table 6 shows the approved temperature rise range for each
heating input, and the air delivery CFM at various temperature
rises. The heating operation airflow must produce a temperature
rise that falls within the approved range.
Table 6 shows the approved temperature rise range for each
heating input, and the air delivery CFM at various temperature
rises. The heating operation airflow must produce a temperature
rise that falls within the approved range.
Refer to Indoor Airflow and Airflow Adjustments section to adjust
heating airflow when required.
LED INDICATION
On
Off
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
NOTES:
1.
A. There is a 3-sec. pause between error code displays.
B. If more than one error code exists, all applicable error codes will be
displayed in numerical sequence
C. This chart is on the wiring diagram located inside the burner access panel.
2.
A. This code indicates an internal processor fault that will reset itself in one
hour. Fault can be caused by stray RF signals in the structure or nearby. This
is a UL requirement.
B. When W1 is energized the burners will remain on for a minimum of 60
seconds.
HEATING SEQUENCE OF OPERATION-HEAT PUMP
Heat Pump Heating–Sequence of Operation: Outdoor temperature above balance point setpoint of Thermidistat™ (option 11).
(See Fig. 15, 16 & 17)
On a call for heating, terminals ‘‘Y” and “G’’ of the Thermidistat™ or Dual Fuel thermostat are energized. The “Y” signal is sent
to the Defrost Board (DB) terminal “Y”. The DB has a built in five
minute anti-short cycle timer which will not allow the compressor
to restart before the time delay has expired. “T2” energizes the
compressor contactor via the High Pressure Switch (HPS) and
Low Pressure Switch (LPS). The compressor and outdoor fan start.
Thermidistat™ “G” energizes the Integrated Gas Control (IGC)
terminal “G”. The blower motor is energized through the “BM”
and “L2” terminals of the IGC.
LIMIT SWITCHES
Normally closed limit switch (LS)– The limit switch is normally
closed and opens on sensing excessive temperature rise in the heat
exchanger compartment. Should the leaving-air temperature rise
above the maximum allowable temperature, the limit switch opens.
When the limit switch opens the IGC control circuit instantly
opens the gas valve circuit and stops gas flow to the burners. The
blower motor continues to run until LS resets.
When the air temperature at the limit switch drops to the
low-temperature setting of the limit switch, the switch closes
allows the ignition cycle to restart. The electric-spark ignition
system cycles and the unit returns to normal heating operation.
AUXILIARY LIMIT SWITCH (ROLLOUT)
The function of the switch is to close the main gas valve in the
event of flame rollout. The switch is located above the main
burners. When the temperature at the auxiliary switch reaches the
maximum allowable temperature and opens, the IGC circuit opens,
opening the gas valve circuit and stopping gas flow to the burners.
The indoor fan motor (IFM) and induced draft motor continue to
run until switch is reset. The IGC LED will display FAULT CODE
7.
When the Thermidistat™ removes the “Y” and “G” calls, the
compressor contactor and outdoor fan and evaporator motor are
de-energized.
HEATING SEQUENCE OF OPERATION-GAS HEAT
Gas Heating–Sequence of Operation: Outdoor temperature below balance point setpoint of Thermidistat™ (option 11).
(See Fig. 15, 16 & 17)
On a call for heating, terminal ‘‘W’’ of the Thermidistat™ or Dual
Fuel thermostat is energized, starting the induced-draft motor.
When the hall-effect sensor on the induced-draft motor senses that
it has reached the required speed, the burner sequence begins. This
function is performed by the integrated gas control (IGC). The
indoor-fan motor is energized 45 sec. after flame is established.
When the thermostat is satisfied and ‘‘W’’ is de-energized, the
burners stop firing and the indoor-fan motor shuts off after a
45-sec. time-off delay.
An LED (light-emitting diode) indicator is provided on the control
board to monitor operation. The control board is located by
removing the burner access panel. During normal operation, the
LED is continuously on. (See Table 7 for error codes.)
18
Step 3—START-UP COOLING AND MAKE ADJUSTMENTS
COMPRESSOR ROTATION
On 3-phase units with scroll compressors, it is important to be
certain compressor is rotation in the proper direction. To determine
whether or not compressor is rotating in the proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
Complete the required procedures given in the Pre-Start-Up
section before starting the unit.
Do not jumper any safety devices when operating the unit.
Do not operate the compressor in cooling mode when the
outdoor temperature is below 40°F (unless accessory lowambient kit is installed).
Do not rapid-cycle the compressor. Allow 5 minutes between
‘‘on’’ cycles to prevent compressor damage.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure
should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1. Reverse any two of the unit power leads.
2. Reapply power to the compressor.
COOLING SEQUENCE OF OPERATION
The suction and discharge pressure levels should now move to
their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
With the room thermostat SYSTEM switch in the COOL position
and the FAN switch in the AUTO. position, the cooling sequence
of operation is as follows:
1. When the room temperature rises to a point that is slightly
above the cooling control setting of the thermostat, the
thermostat completes circuit between thermostat terminal “R”
to terminals “Y”, “G” and “O”. These completed circuits
through the thermostat:
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with R-410A refrigerant,
tested, and factory-sealed.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R-410A
charge. The charging label and the tables shown refer to system
temperatures and pressures in cooling mode only.
2. “O” terminal energizes Reversing Valve (RV) through Defrost
Board (DB).Note: The RV remains energized while the
Thermidistat™ cooling mode is selected.
3. “Y” terminal energizes DB “Y”. After 5 minute time delay of
DB terminals “T1” & “T2” has expired, if LPS and HPS safety
switches are closed. Compressor contactor is energized starting the compressor and outdoor fan motor.
An accurate superheat, thermocouple- or thermistor-type thermometer, a sling psychrometer, and a gauge manifold are required
when using the superheat charging method for evaluating the unit
charge. Do not use mercury or small dial-type thermometers
because they are not adequate for this type of measurement.
4. “G” terminal energizes “BM” terminal of Integrated Gas
Control (IGC) and the indoor motor starts.
NOTE: Once the compressor has started and then stopped, it
should not be started again until 5 minutes have elapsed. The
cooling cycle remains “on” until the room temperature drops to a
point that is slightly below the cooling control setting. The
thermostat opens the circuit between thermostat terminal R to
terminals Y, O and G. These open circuits de-energize contactor
coil C and BM of the IGC. The outdoor and compressor motors
stop. After a 30-sec. delay, the blower motor stops. The unit is in
a “standby” condition, waiting for the next “call for cooling” from
the room thermostat.
When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge must always be very
minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
Refrigerant Charge– Amount of refrigerant charge is listed on
unit nameplate (also refer to Table 1). Refer to Corporate GTAC
2-5 Charging, Recovery, Recycling, and Reclamation training
manual and the following procedures.
NOTE: Unit panels must be in place when unit is operating
during charging procedure.
CHECKING COOLING CONTROL OPERATION (NON-ICM
UNITS)
Start and check the unit for proper cooling control operation as
follows:
1. No Charge– Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant
(Refer to Table 1).
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is placed
in ON position and shuts down when FAN switch is placed in
AUTO. position.
2. Low-Charge Cooling– Using Cooling Charging Charts (Fig
20–25), vary refrigerant until the conditions of the appropriate
chart are met. These charging charts are different from type
normally used. Charts are based on charging the units to the
correct superheat for various operating conditions. Accurate
pressure gauge and temperature sensing device are required.
Connect the pressure gauge to the service port on the suction
line. Mount the temperature sensing device on the suction line
and insulate it so that outdoor ambient temperature does not
affect the reading. Indoor air (CFM) must be within the
normal operating range of the unit.
2. Place SYSTEM switch in COOL position and FAN switch in
AUTO. position. Set cooling control below room temperature.
Observe that compressor, outdoor fan, and indoor blower
motors start. Observe that cooling cycle shuts down when
control setting is satisfied. The indoor fan will continue to run
for 30 sec.
3. When using an auto-changeover room thermostat, place both
SYSTEM and FAN switches in AUTO. positions. Observe
that unit operates in Heating mode when temperature control
is set to ‘‘call for heating’’ (above room temperature) and
operates in Cooling mode when temperature control is set to
‘‘call for cooling’’ (below room temperature).
3. Using Cooling Charging Charts– Compare outdoor-air temperature (°F db) and the suction line pressure (psig) and
temperature with corresponding charging chart (See Fig.
20–25).
19
INDOOR COIL
OUTDOOR COIL
LCS
COMPRESSOR
ACCUMULATOR
Bypass
Position
HPS
Metering
Position
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater® Metering Device
Arrow indicates direction of flow
C00095
Fig. 18—Typical Heat Pump Operation, Heating Mode
EXAMPLE: (Fig. 20)
Outdoor Temperature.....85 F
Suction Pressure......145 psig
Suction Temperature should be...70 F
(Suction Temperature may vary +/– 3°F)
Table 8–Color Coding for 208/230-V Motor Leads
3-SPEED
black = high speed
blue = medium speed
red = low speed
4. Using a tolerance of +/– 3°F, add refrigerant if actual
temperature is more than 3°F higher than proper suction-tube
temperature, or remove refrigerant if actual temperature is
more than 3°F lower than required suction-tube temperature.
Recheck the readings as charge is adjusted.
2-SPEED
black = high speed
–
red = low speed
is attached to terminal BM for single- and 3-phase units. To change
the speed, remove and replace with lead for desired blower motor
speed. Insulate the removed lead to avoid contact with chassis
parts.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to the Check for Refrigerant Leaks section.
MAINTENANCE
To ensure continuing high performance and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This combination
heating/cooling unit should be inspected at least once each year by
a qualified service person. To troubleshoot cooling or heating
components of units, refer to Tables 11, 12 and 13.
NOTE: Consult your local dealer about the availability of a
maintenance contract.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
For cooling operation, the recommended airflow is 350 to 450
cfm for each 12,000 Btuh of rated cooling capacity. For
heating operation, the airflow must produce a temperature rise
that falls within the range stamped on the unit rating plate.
Table 6 shows the temperature rise at various airflow rates. Table
10 shows both heating and cooling airflows at various external
static pressures. Refer to these tables to determine the airflow for
the system being installed.
The ability to properly perform maintenance on this equipment requires certain expertise, mechanical skills, tools, and
equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment other than those
procedures recommended in the User’s Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SERIOUS INJURY OR DEATH AND POSSIBLE DAMAGE TO
THIS EQUIPMENT.
NOTE: Be sure that all supply- and return-air grilles are open,
free from obstructions, and adjusted properly.
Before changing blower speed, shut off gas supply. Then
disconnect electrical power to the unit . Electrical shock or
explosion can cause serious injury or death.
Airflow can be changed by changing the lead connections of the
blower motor.
All 48JZ units are factory wired for low speed and may need to be
wired for medium or high speed in the field.
For 208/230V
For color coding on the 208/230V motor leads, see Table 8.
To change the speed of the blower motor, remove the fan motor
speed leg lead from the blower relay (BM on the IGC). This wire
20
INDOOR COIL
OUTDOOR COIL
LCS
COMPRESSOR
ACCUMULATOR
Metering
Position
HPS
Bypass
Position
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater® Metering Device
Arrow indicates direction of flow
C00096
Fig. 19—Typical Heat Pump Operation, Cooling Mode
Table 9—Filter Pressure Drop (In. wg)
20 X 20 X 1
20 X 24 X 1
24 X 30 X 1
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15
—
—
—
—
—
—
—
—
—
—
—
—
—
—
— 0.09 0.10 0.11 0.13 0.14 0.15 0.16
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
(024) 60 Hz COOLING CHARGING CHART
For use with units using R410a Refrigerant
Failure to follow these warnings could result in serious injury
or death:
1. First, turn off gas supply to the unit. Then turn off electrical
power and install lock-out tag before performing any
maintenance or service on the unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injury can result
from sharp edges, etc.
3. Never place anything combustible either on, or in contact
with, the unit.
4. Should overheating occur or the gas supply fail to shut off,
turn off external main manual gas valve to the unit. Then
shut off electrical supply.
SUCTION LINE TEMPERATURE (DEG. C)
-7
-1
4
10
15
21
26
OUTDOOR
TEMP
180
170
1152
SUCTION LINE PRESSURE (PSIG)
160
1052
150
140
952
130
852
120
110
752
SUCTION LINE PRESSURE (kPa)
FILTER SIZE
F
125
C
52
115
46
105
41
95
35
85
29
75
24
65
18
55
13
45
7
100
652
Errors made when reconnecting wires may cause improper
and dangerous operation. Label all wires prior to disconnection when servicing.
90
80
552
20
30
40
50
60
70
80
SUCTION LINE TEMPERATURE (DEG. F)
50JZ500066
Before cleaning the blower motor and wheel, turn off gas
supply. Then turn off and tag electrical power to the unit.
Failure to adhere to this warning could cause serious injury or
death.
C00082
Fig. 20—Cooling Charging Chart, 48JZ024 Units
The minimum maintenance requirements for this equipment are as
follows:
2. Inspect indoor coil, outdoor coil, drain pan, and condensate
drain each cooling season for cleanliness. Clean when necessary.
1. Inspect air filter(s) each month. Clean or replace when
necessary. Certain geographical locations may require more
frequent inspections.
3. Inspect blower motor and wheel for cleanliness at the beginning of each heating and cooling season. Clean when necessary. For first heating and cooling season, inspect blower
21
Table 10—Wet Coil Air Delivery* – Horizontal and Downflow Discharge –
Unit 48JZ024-060 (Deduct 10 percent for 208 Volts)
Unit
Motor Speed
Low
024
Med
High
Low
030
Med
High
Low
036
Med
High
Low
042
Med
High
Low
048
Med
High
Low
060
Med
High
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
Watts
Cfm
0.0
279
882
—
—
—
—
243
885
353
1195
—
—
490
1431
—
—
—
—
634
1669
—
—
—
—
591
1554
755
1834
—
—
589
1946
750
2189
—
—
0.1
282
801
—
—
—
—
244
842
339
1134
—
—
463
1398
513
1491
—
—
618
1599
—
—
—
—
578
1523
737
1802
—
—
576
1891
733
2097
879
2337
0.2
280
738
—
—
—
—
242
786
333
1070
—
—
446
1347
501
1426
645
1484
608
1545
—
—
—
—
573
1496
719
1758
—
—
569
1836
715
2021
850
2159
230 VOLT
External Static Pressure (in. wg)
0.3
0.4
0.5
0.6
277
276
—
—
674
604
—
—
373
367
361
356
936
868
797
719
—
—
463
452
—
—
956
878
—
—
—
—
—
—
—
—
330
326
320
—
997
911
818
—
443
436
426
416
1230
1145
1061
977
432
418
403
389
1281
1205
1118
1024
488
474
459
443
1351
1267
1175
1077
636
627
616
605
1410
1330
1243
1147
598
583
562
534
1498
1448
1391
1326
733
704
672
638
1746
1688
1630
1566
—
—
—
797
—
—
—
1727
568
559
544
524
1467
1432
1387
1332
699
678
653
627
1706
1648
1585
1520
890
858
828
801
1943
1870
1793
1711
566
559
541
499
1779
1718
1651
1577
695
673
648
623
1952
1883
1809
1727
821
795
772
750
2050
1974
1905
1824
0.7
—
—
351
626
439
794
—
—
—
—
406
888
378
921
428
976
593
1044
502
1257
604
1492
773
1632
500
1269
602
1455
777
1624
—
—
598
1635
728
1722
0.8
—
—
—
—
428
702
—
—
—
—
397
786
—
—
—
—
583
936
473
1189
574
1399
751
1537
—
—
579
1392
756
1531
—
—
577
1530
701
1597
0.9
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
454
1132
550
1279
727
1423
—
—
562
1332
734
1433
—
—
—
—
—
—
1.0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
457
1101
536
1120
696
1308
—
—
556
1276
709
1329
—
—
—
—
—
—
* Air delivery values are without air filter.
NOTE: Deduct field-supplied air filter pressure drop to obtain external static pressure available for ducting.
wheel bi-monthly to determine proper cleaning frequency.
4. Check electrical connections for tightness and controls for
proper operation each heating and cooling season. Service
when necessary.
5. Check and inspect heating section before each heating season.
Clean and adjust when necessary.
6. Check flue hood and remove any obstructions, if necessary.
AIR FILTER
INDOOR BLOWER AND MOTOR
NOTE: All motors are prelubricated. Do not attempt to lubricate
these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
Before cleaning the blower motor and wheel, turn off gas
supply. Then turn off and tag electrical power to the unit.
Failure to adhere to this warning could cause serious injury or
death.
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the same
dimensional size and type as originally installed. (See Table
1 for recommended filter sizes.)
Cleaning the Blower Motor and Wheel
1. Remove and disassemble blower assembly as follows:
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each heating and cooling season or whenever the filter(s) becomes
clogged with dust and/or lint.
a. Remove unit access and internal blower panels.
b. Disconnect motor lead from blower relay (BR). Disconnect
yellow lead from terminal L2 of the contactor.
22
(030) 60 Hz COOLING CHARGING CHART
For Use with Units Using R410a Refrigerant
(042) 60 Hz COOLING CHARGING CHART
For use with units using R410a Refrigerant
SUCTION LINE TEMPERATURE (DEG. C)
4
10
15
21
OUTDOOR
TEMP
F
C
125
52
26
180
1173
115
105
46
41
160
1104
95
35
85
29
75
24
1035
SUCTION LINE PRESSURE (PSIG)
150
966
140
897
130
120
828
110
759
100
690
90
621
SUCTION LINE PRESSURE (KILOPASCALS)
170
65
-7
18
55
13
45
-1
4
10
15
21
26
180
SUCTION LINE PRESSURE (PSIG)
-1
OUTDOOR
TEMP
170
1173
F
125
C
52
160
1104
115
46
1035
150
140
966
130
897
120
828
110
759
100
690
90
621
7
80
SUCTION LINE PRESSURE (K
ILOPASCALS)
SUCTION LINE TEMPERATURE (DEG. C)
-7
105
41
95
35
85
29
75
24
65
18
55
13
45
7
552
20
30
40
50
60
70
80
SUCTION LINE TEMPERATURE (DEG. F)
80
552
20
30
40
50
60
SUCTION LINE TEMPERATURE (DEG. F)
70
80
50JZ500067
50JZ500069
C00083
C00085
Fig. 21—Cooling Charging Chart, 48JZ030 Units
Fig. 23—Cooling Charging Chart, 48JZ042 Units
(036) 60 Hz COOLING CHARGING CHART
For Use with Units Using R410a Refrigerant
(048) 60Hz COOLING CHARGING CHART
For use with units using R410a Refrigerant
SUCTION LINE TEMPERATURE (DEG. C)
-1
4
10
15
21
26
-7
180
966
140
130
897
120
828
110
759
100
690
90
621
SUCTION LINE PRESSURE (KILOPASCALS)
1035
150
115
46
105
41
95
35
85
29
75
24
65
18
55
13
45
7
4
10
15
21
26
1173
170
SUCTION LINE PRESSURE (PSIG)
1104
160
SUCTION LINE PRESSURE (PSIG)
OUTDOOR
TEMP
F
C
125
52
1173
170
-1
180
160
1104
150
1035
966
140
130
897
120
828
110
759
100
690
90
621
80
SUCTION LINE PRESSURE (K ILOPASCALS )
-7
OUTDOOR
TEMP
SUCTION LINE TEMPERATURE (DEG. C)
F
125
C
52
115
46
105
41
95
35
85
29
75
24
65
18
55
13
45
7
552
30
40
50
60
70
80
SUCTION LINE TEMPERATURE (DEG. F)
80
552
20
30
40
50
60
SUCTION LINE TEMPERATURE (DEG. F)
70
80
50JZ500068
50JZ500070
C00084
C00086
Fig. 22—Cooling Charging Chart, 48JZ036 Units
Fig. 24—Cooling Charging Chart, 48JZ048 Units
c. On all units, remove blower assembly from unit. Remove
screws securing blower to blower partition and slide
assembly out. Be careful not to tear insulation in blower
compartment.
a. Ensure proper reassembly by marking wheel orientation.
b. Lift wheel from housing. When handling and/or cleaning
blower wheel, be sure not to disturb balance weights (clips)
on blower wheel vanes.
d. Ensure proper reassembly by marking blower wheel and
motor in relation to blower housing before disassembly.
c. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush attachment. Remove grease and oil with mild solvent.
e. Loosen setscrew(s) that secures wheel to motor shaft.
Remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of housing.
d. Reassemble wheel into housing.
2. Remove and clean blower wheel as follows:
23
(060) 60 Hz COOLING CHARGING CHART
For use with units using R410a Refrigerant
SUCTION LINE TEMPERATURE (DEG. C)
-7
-1
4
10
15
21
26
OUTDOOR
TEMP
170
1173
F
125
C
52
160
1104
115
46
1035
150
140
966
130
897
120
828
110
759
100
690
90
621
80
SUCTION LINE PRESSURE (K ILOPASCALS )
SUCTION LINE PRESSURE (PSIG)
180
105
41
95
35
85
29
75
24
65
18
55
13
45
7
FRONT
ACCESS PANEL
552
20
30
40
50
60
70
80
C99091
SUCTION LINE TEMPERATURE (DEG. F)
Fig. 27—Unit Access Panel
50JZ500071
C00087
Fig. 25—Cooling Charging Chart, 48JZ060 Units
BLOWER
HOUSING
INDUCED DRAFT MOTOR MOUNT
2 SETSCREWS
(HIDDEN)
VENT HOOD
IN SHIPPING
LOCATION
FLUE
COLLECTOR BLOWER
HOUSING
BOX
ROLLOUT
SWITCH
BURNER MOUNTING
RACK
SCREW
C99022
C99085
Fig. 28—Removal of Motor and Blower Wheel
Fig. 26—Blower Housing and Flue Collector Box
3. Remove the 12 screws holding the flue collector box cover
(See Fig. 26, 28 & 29) to the heat exchanger assembly. Inspect
the heat exchangers.
e. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of
shaft.
4. Clean all surfaces, as required, using a wire brush.
f. Reinstall blower panel and unit access panel.
COMBUSTION-AIR BLOWER
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during heating and
cooling cycles.
Clean periodically to assure proper airflow and heating efficiency.
Inspect blower wheel every fall and periodically during the heating
season. For the first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.
FLUE GAS PASSAGEWAYS
To inspect the flue collector box and upper areas of the heat
exchanger:
To inspect blower wheel, remove draft hood assembly. Shine a
flashlight into opening to inspect wheel. If cleaning is required,
remove motor and wheel as follows:
1. Remove the combustion blower wheel and motor assembly
according to directions in the Combustion-Air Blower section.
1. Remove unit access panel (See Fig. 27).
2. Remove the 3 screws holding the blower housing to the flue
collector box cover (See Fig. 28).
2. Remove the 7 screws that attach induced-draft motor mounting plate to blower housing (See Fig. 26 & 28).
24
6. Remove ignitor and sensor wires at the ignitor module.
7. Remove the mounting screw that attaches the burner rack to
the unit base (See Fig. 28).
8. Slide the burner rack out of the unit (See Fig. 26 and 29).
9. To reinstall, reverse the procedure outlined above.
OUTDOOR COIL, INDOOR COIL, AND
CONDENSATE DRAIN
Inspect the Outdoor coil, Indoor coil, and condensate drain at least
once each year.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all
obstructions, including weeds and shrubs, that interfere with the
airflow through the outdoor coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent-and-water solution.
Rinse coils with clear water, using a garden hose. Be careful not to
splash water on motors, insulation, wiring, or air filter(s). For best
results, spray outdoor coil fins from inside to outside the unit. On
units with an outer and inner outdoor coil, be sure to clean between
the coils. Be sure to flush all dirt and debris from the unit base.
C99086
Inspect the drain and condensate drain line when inspecting the
coils. Clean the drain and condensate drain line by removing all
foreign matter from the drain. Flush the drain and drain tube with
clear water. Do not splash water on the insulation, motor, wiring,
or air filter(s). If the drain tube is restricted, clear it with a
“plumbers snake” or similar probe device. Ensure that the auxiliary
drain port above the drain tube is also clear
Fig. 29—Burner Rack Removed
3. Slide the motor and blower wheel assembly out of the blower
housing (See Fig. 28). Clean the blower wheel. If additional
cleaning is required, continue with Steps 4 and 5.
4. To remove blower, remove 2 setscrews.
5. To remove motor and cooling fan assembly, remove 4 screws
that hold blower housing to mounting plate.
OUTDOOR FAN
6. To reinstall, reverse the procedure outlined above.
LIMIT SWITCH
Keep the outdoor fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
Remove unit access panel, then the blower door to gain access to
the limit switch. The limit switch is located above the indoor
blower housing.
1. Remove 6 screws holding outdoor motor grille and motor to
top cover.
BURNER IGNITION
Unit is equipped with a direct spark ignition 100 percent lockout
system. Ignition module is located in the control box. Module
contains a self-diagnostic LED. During servicing, refer to label
diagram for LED interpretation.
2. Turn motor/grille assembly upside down on top cover to
expose the fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen the setscrew and slide the
fan off the motor shaft.
If lockout occurs, unit may be reset by either momentarily
interrupting power supply to unit or by turning selector switch to
OFF position at the thermostat.
5. When replacing fan blade, position blade so the hub is 1/8 in.
away from the motor end. (1/8 in. of motor shaft will be
visible. See Fig. 12).
MAIN BURNERS
At the beginning of each heating season, inspect for deterioration
or blockage due to corrosion or other causes. Observe the main
burner flames and adjust, if necessary.
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
ELECTRICAL CONTROLS AND WIRING
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the gas supply, and then the electrical power to the
unit.
When servicing gas train, do not hit or plug orifice spuds.
Removal of Gas Train
To remove the gas train for servicing:
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed, disassemble the connection, clean all the parts, re-strip the
wire end and reassemble the connection properly and securely.
1. Shut off main gas valve.
2. Shut off power to unit.
3. Remove unit access panel (See Fig. 26).
4. Disconnect gas piping at unit gas valve.
After inspecting the electrical controls and wiring, replace the
access panel. Start the unit, and observe at least one complete
5. Remove wires connected to gas valve. Mark each wire.
25
OF1
DFT
OF2
T2 C C O
T1
Y
O R W2 Y C
P1
30
30
60
120
60
P3
ON
DFT
QUIET
SHIFT
90
INTERVAL TIMER OFF
J1
SPEEDUP
Speedup
Pins
CESO130076–00
Quiet
Shift
Defrost interval
DIP switches
A99442
Fig. 30—Defrost Control Board
field-selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at
30 minutes).
heating cycle and one complete cooling cycle to ensure proper
operation. If discrepancies are observed in either or both operating
cycles, or if a suspected malfunction has occurred, check each
electrical component with the proper electrical instrumentation.
Refer to the unit wiring label when making these checkouts.
NOTE: Refer to the heating and/or cooling sequence of operation
in this publication as an aid in determining proper control
operation
HEAT PUMP SYSTEM ITEMS
Defrost Control
QUIET SHIFT
Quiet Shift is a field-selectable defrost mode, which will eliminate
occasional noise that could be heard at the start of defrost cycle
and restarting of heating cycle. It is selected by placing DIP switch
3 (on defrost board) in ON position.
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Reversing valve will energize, outdoor fan will turn off, compressor will
turn off for 30 sec and then turn back on to complete defrost. At
the start of heating after conclusion of defrost reversing valve will
de-energize, compressor will turn off for another 30 sec, and the
outdoor fan will stay off for 40 sec, before starting in the Heating
mode.
Defrost
The defrost control is a time/temperature control which includes a
To initiate a forced defrost, two options are available depending on
the status of the defrost thermostat.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screw driver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle, as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screw driver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with compressor operation). On return to heating operation, compressor will
again turn off for an additional 30 sec and the outdoor fan for 40
sec. When the Quiet Shift is in OFF position, only a brief 30 sec
cycle will be observed.
If it is desirable to observe a complete defrost in warmer weather,
the defrost thermostat must be closed as follows.
1. Turn off power to outdoor unit and install lock-out tag.
2. Disconnect outdoor fan motor lead from OF2 on control
board. (See Fig. 30) Tape to prevent grounding.
26
3. Restart unit in Heating mode, allowing frost to accumulate on
outdoor coil.
GAS INPUT
The gas input does not require checking unless improper heating
performance is suspected. If a problem exists, refer to the Start-Up
section.
4. After a few minutes in Heating mode, liquid line temperature
should drop below closing point of defrost thermostat (approximately 30°F).
INDOOR AIRFLOW
NOTE: Unit will remain in defrost until defrost thermostat
reopens at approximately 80°F coil temperature at liquid line or
remainder of defrost cycle time.
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply- and return-air grilles are open and free from
obstructions, and that the air filter is clean. When necessary, refer
to the Indoor Airflow and Airflow Adjustments section to check the
system airflow.
5. Turn off power to outdoor and reconnect fan motor lead to
OF2 on control board after above forced defrost cycle.
Defrost Thermostat
The defrost thermostat signals heat pump that conditions are right
for defrost or that conditions have changed to terminate defrost. It
is a thermally actuated switch clamped to outdoor coil to sense its
temperature. Normal temperature range is closed at 30° ± 3°F and
open at 80° ± 5°F.
PURON® SYSTEM ITEMS
METERING DEVICE — ACCURATER
This metering device is an AccuRater Piston (fixed orifice) and is
contained in the brass hex-body in the liquid line.
PRESSURE SWITCHES
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R-410A)
systems. R-22 pressure switches must not be used as replacements
for the Puron (R-410A) system.
FEEDER TUBE
STUB TUBE
LOSS OF CHARGE SWITCH
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig. If system pressure is above this, switch
should be closed. To check switch:
DEFROST
THERMOSTAT
C99029
1. Turn off all power to unit and install lock-out tag.
Fig. 31—Defrost Thermostat
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
NOTE: The defrost thermostat must be located on the liquid side
of the outdoor coil on the bottom circuit and as close to the coil as
possible.
NOTE: Because these switches are attached to refrigeration
system under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read 0 psi. Never open system
without breaking vacuum with dry nitrogen.
Check Defrost Thermostat
There is a liquid header with a brass distributor and feeder tube
going into outdoor coil. At the end of 1 of the feeder tubes, there
is a 3/8-in. OD stub tube approximately 3 in. long (See Fig. 31).
The defrost thermostat should be located on stub tube. Note that
there is only 1 stub tube used with liquid header, and on most units
it is the bottom circuit.
HIGH-PRESSURE SWITCH
The high-pressure switch is located in the discharge line and
protects against excessive outdoor coil pressure. It opens at 610
psig.
REFRIGERANT CIRCUIT
High pressure may be caused by a dirty outdoor coil, failed fan
motor, or outdoor air recirculation.
Annually inspect all refrigerant tubing connections and the unit
base for oil accumulations. Detecting oil generally indicates a
refrigerant leak.
To check switch:
1. Turn off all power to unit and install lock-out tag.
2. Disconnect leads on switch.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal to avoid
serious injury or death. Use all service ports and open all
flow-control devices, including solenoid valves.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
COPELAND SCROLL COMPRESSOR (PURON REFRIGERANT)
The compressor used in this product is specifically designed to
operate with Puron (R-410A) refrigerant and cannot be interchanged.
If oil is detected or if low cooling performance is suspected,
leak-test all refrigerant tubing using an electronic leak-detector,
halide torch, or liquid-soap solution. If a refrigerant leak is
detected, refer to the Check for Refrigerant Leaks section.
The compressor is an electrical (as well as mechanical) device.
Exercise extreme caution when working near compressors. Power
should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards.
If no refrigerant leaks are found and low cooling performance is
suspected, refer to the Checking and Adjusting Refrigerant Charge
section.
27
Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more. When
performing any service that may risk exposure of compressor oil to
the roof, take appropriate precautions to protect roofing. Procedures which risk oil leakage include, but are not limited to,
compressor replacement, repairing refrigerant leaks, replacing
refrigerant components such as filter drier, pressure switch, metering device, coil, accumulator, or reversing valve.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refrigerants and oils. Failure to follow this warning can cause a fire,
serious injury, or death.
The scroll compressor pumps refrigerant throughout the system by
the interaction of a stationary and an orbiting scroll. The compressor is equipped with an anti-rotational device and an internal
pressure relief port. The anti-rotational device prevents the scroll
from turning backwards and replaces the need for a cycle protector. The pressure relief port is a safety device, designed to protect
against extreme high pressure. The relief port has an operating
range between 550 and 625 psi differential pressure.
Synthetic Roof Precautionary Procedure
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drip cloth or tarp. Cover an approximate
10 X 10 ft. area.
2. Cover area in front of the unit service panel with a terry cloth
shop towel to absorb lubricant spills and prevent run-offs, and
protect drop cloth from tears caused by tools or components.
The Copeland scroll compressor uses Mobil 3MA POE oil.
This is the only oil allowed for oil recharge.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run-offs
through the louvered openings in the base.
REFRIGERANT SYSTEM
This information covers the refrigerant system of the 48JZ,
including the compressor oil needed, servicing systems on roofs
containing synthetic materials, the filter drier and refrigerant
charging.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
Refrigerant
BI-FLOW FILTER DRIER
This bi-flow filter drier is specifically designed to operate with
Puron. Use only factory-authorized components. This filter drier
must be replaced whenever the refrigerant system is opened. When
removing a filter drier, use a tubing cutter to cut the drier from the
system. Do not unsweat a filter drier from the system. Heat
from unsweating will release moisture and contaminants from
drier into system.
This system uses Puron (R-410A) refrigerant which has
higher operating pressures than R-22 and other refrigerants.
No other refrigerant may be used in this system. Gauge set,
hoses, and recovery system must be designed to handle
Puron. If you are unsure consult the equipment manufacturer.
Failure to use Puron compatible servicing equipment or
replacement components may result in property damage or
injury.
PURON (R-410A) REFRIGERANT CHARGING
Refer to unit information plate and charging chart. Some R-410A
refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow from cylinder in upright position. For cylinders
equipped with a dip tube, charge Puron units with cylinder in
upright position and a commercial metering device in manifold
hose. Charge refrigerant into suction-line.
Compressor Oil
The compressor in this system uses a polyolester (POE) oil, Mobil
3MA POE. This oil is extremely hygroscopic, meaning it absorbs
water readily. POE oils can absorb 15 times as much water as other
oils designed for HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
TROUBLESHOOTING
Use the Troubleshooting Guides (See Tables 11–13) if problems
occur with these units.
SERVICING SYSTEMS ON ROOFS WITH SYNTHETIC
MATERIALS
START-UP CHECKLIST
Use the Start-Up Checklist to ensure proper start-up procedures are
followed.
POE (polyolester) compressor lubricants are known to cause long
term damage to some synthetic roofing materials.
28
HEAT PUMP WITH PURON—QUICK REFERENCE GUIDE
Puron refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement components are
designed to operate with Puron. Puron refrigerant cylinders are rose colored.
• Puron refrigerant cylinders manufactured prior to March 1, 1999, have a dip tube that allows liquid to flow out of cylinder in upright position.
Cylinders manufactured March 1, 1999 and later DO NOT have a dip tube and MUST be positioned upside down to allow liquid to flow.
• Recovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.
• Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose.
• Manifold sets should be 750 psig high-side and 200 psig low-side with 520 psig low-side retard.
• Use hoses with 750 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• Puron, as with other HFCs, is only compatible with POE oils.
• Vacuum pumps will not remove moisture from oil.
• Only use factory specified liquid-line filter driers with rated working pressures no less than 600 psig.
• Do not install a suction-line filter drier in liquid line.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• POE oils may cause damage to certain plastics and roofing materials.
• Wrap all filter driers and service valves with wet cloth when brazing.
• A Puron liquid-line filter drier is required on every unit.
• Do not use an R-22 TXV.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, break vacuum with dry nitrogen and replace filter driers.
• Do not vent Puron into the atmosphere.
• Observe all warnings, cautions, and bold text.
• Do not leave Puron suction line driers in place for more than 72 hrs.
29
Table 11—Troubleshooting Guide—Cooling
SYMPTOM
CAUSE
REMEDY
Power Failure
Compressor and outdoor fan
will not start.
Compressor will not
start but outdoor
fan runs.
Compressor cycles (other than
normally satisfying thermostat).
Compressor operates continuously.
Excessive head pressure.
Head pressure too low.
Excessive suction pressure.
Suction pressure too low.
Call power company.
Fuse blown or circuit breaker tripped
Replace fuse or reset circuit breaker.
Defective thermostat, contactor, transformer, or control relay
Replace component.
Insufficient line voltage
Determine cause and correct.
Incorrect or faulty wiring
Check wiring diagram and rewire correctly.
Thermostat setting too high
Lower thermostat setting below room temperature.
Faulty wiring or loose connections in compressor circuit
Check wiring and repair or replace.
Compressor motor burned out, seized, or internal
overload open
Determine cause after allowing time
for overload to cool and close
Replace compressor.
Defective run/start capacitor, overload, start relay
Determine cause and replace.
One leg of 3-phase power dead
Replace fuse or reset circuit breaker.
Determine cause.
Refrigerant overcharge or undercharge
Recover refrigerant, evacuate system, and recharge to
capacities shown on nameplate.
Defective compressor
Replace and determine cause.
Insufficient line voltage
Determine cause and correct.
Blocked outdoor coil
Determine cause and correct.
Defective run/start capacitor, overload or start relay
Determine cause and replace.
Defective thermostat
Replace thermostat.
Faulty outdoor-fan motor or capacitor
Replace.
Restriction in refrigerant system
Locate restriction and remove.
Dirty air filter
Replace filter.
Unit undersized for load
Decrease load or increase unit size.
Thermostat set too low
Reset thermostat.
Low refrigerant charge
Locate leak, repair, and recharge.
Air in system
Recover refrigerant, evacuate system, and recharge.
Outdoor coil dirty or restricted
Clean coil or remove restriction .
Dirty air filter
Replace filter.
Dirty outdoor coil
Clean coil.
Refrigerant overcharged
Recover excess refrigerant.
Air in system
Recover refrigerant, evacuate system, and recharge.
Outdoor coil air restricted or air short-cycling
Determine cause and correct.
Low refrigerant charge
Check for leaks, repair, and recharge.
Compressor scroll plates cracked
Replace compressor.
Restriction in liquid tube
Remove restriction.
High heat load
Check for source and eliminate.
Refrigerant overcharged
Recover excess refrigerant.
Dirty air filter
Replace Filter.
Low refrigerant charge
Check for leaks, repair, and recharge.
Metering device or low side restricted
Remove source of restriction.
Insufficient indoor airflow
Increase air quantity. Check filter — replace if necessary.
Temperature too low in conditioned area
Reset thermostat.
Outdoor ambient below 40°F
(55°F with ICM FIOP)
Install low-ambient kit .
Factory-installed filter-drier restricted
Replace.
30
Table 12—Troubleshooting Guide–Heating
SYMPTOM
Burners will not ignite.
Inadequate heating.
Poor flame characteristics.
CAUSE
REMEDY
Water in gas line
Drain. Install drip leg.
No power to furnace
Check power supply fuses, wiring, or circuit breaker.
No 24-v power supply to control circuit
Check transformer.
NOTE: Some transformers have internal over-current
protection that requires a cool-down period to reset.
Mis-wired or loose connections
Check all wiring and wire nut connections
Burned-out heat anticipator in
thermostat
Replace thermostat.
Broken thermostat wire
Run continuity check. Replace wire if necessary.
Misaligned spark electrodes
Check flame ignition and sense electrode positioning.
Adjust as necessary.
No gas at main burners
1.Check gas line for air. Purge as necessary.
NOTE: After purging gas line of air, wait at least 5 minutes for any
gas to dissipate before attempting to light unit.
2. Check gas valve.
IGC board not allowing spark
Verify IGC has 24-v. at “W” & “E”
If so, replace IGC
Dirty air filter
Clean or replace filter as necessary.
Gas input to furnace too low
Check gas pressure at manifold match with that on
unit nameplate.
Unit undersized for application
Replace with proper unit or add additional unit.
Restricted airflow
Clean or replace filter. Remove any restriction.
Blower speed too low
Use faster speed tap if available, or install alternate
motor.
Limit switch cycles main burners
Check rotation of blower, thermostat heat anticipator settings,
temperature rise of unit. Adjust as necessary.
–or–
Verify use of proper thermostat – Thermidistat™
or dual-fuel thermostat must be used.
Incomplete combustion results in:
Aldehyde odors, carbon monoxide, sooting
flame, floating flame
1.Tighten all screws around burner compartment.
2. Cracked heat exchanger. Replace.
3. Unit over-fired. Reduce input (change orifices or
adjust gas line or manifold pressure).
4. Check burner alignment.
31
Table 13—Troubleshooting Guide–LED Error Codes
SYMPTOM
CAUSE
REMEDY
Hardware failure.
(LED OFF)
Loss of power to control module (IGC)*.
Check 5-amp fuse on IGC*, power to unit, 24–v circuit breaker, and
transformer. Units without a 24–v circuit breaker have an internal
overload in the 24–v transformer. If the overload trips, allow 10 minutes
for automatic reset.
Fan ON/OFF delay modified
(LED 1 FLASH)
High limit switch opens during heat
exchanger warm-up period before fan-on
delay expires.
Limit switch opens within three minutes
after blower-off delay timing in Heating mode.
Ensure unit is fired on rate; ensure temperature rise is correct.
Ensure unit’s external static pressure is within application guidelines.
Limit switch faults.
(LED 2 flashes)
High temperature limit switch is open.
Check the operation of the indoor fan motor. Ensure
that the supply-air temperature rise is in accordance with the range
on the unit nameplate.
Flame sense fault.
(LED 3 flashes)
The IGC* sensed flame that should not be
present.
Reset unit. If problem persists, replace control board.
4 consecutive limit switch faults.
(LED 4 flashes)
Inadequate airflow to unit
Check operation of indoor fan motor and that supply-air
temperature rise agrees with range on unit nameplate information.
Ignition lockout.
(LED 5 flashes)
Unit unsuccessfully attempted ignition for
15 minutes.
Check ignitor and flame sensor electrode spacing, gaps, etc. Ensure
that flame sense and ignition wires are properly terminated. Verify
that unit is obtaining proper amount of gas.
Induced-draft motor fault.
(LED 6 flashes)
IGC does not sense that induced-draft
motor is operating.*
Check for proper voltage. If motor is operating, check the speed
sensor plug/IGC Terminal J2 connection. Proper connection:
PIN 1— White
PIN 2 — Red
PIN 3 — Black.
Rollout switch fault.
(LED 7 flashes)
Rollout switch has opened.
Rollout switch will automatically reset, but IGC* will continue to lockout unit. Check gas valve operation. Ensure that induced-draft
blower wheel is properly secured to motor shaft. Reset unit at unit
disconnect.
Rollout control fault.
(LED 8 flashes)
Microprocessor has sensed an error in the
software or hardware.
If error code is not cleared by resetting unit power, replace the IGC*.
9 Flashes
Redundant Safety Circuit
Software Malfunction
Internal processor fault that will reset itself in 1 hour.
Fault can be caused by stray RF signals in the structure or nearby.
This is a UL Requirement.
: If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that may be present before handling new control board. The
* WARNING
IGC is sensitive to static electricity and may be damaged if the necessary precautions are not taken.
IMPORTANT: Refer to Table 12—Troubleshooting Guide—Heating for additional troubleshooting analysis.
LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode
32
START-UP CHECKLIST
(Remove and Store in Job File)
I. PRELIMINARY INFORMATION
MODEL NO: .............................................................................................................................................................
SERIAL NO: ..............................................................................................................................................................
DATE: ........................................................................................................................................................................
TECHNICIAN/JOB LOCATION:.........................................................................................................................
II. PRE-START-UP (insert checkmark in box as each item is completed)
____ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
____ REMOVE ALL SHIPPING HOLD-DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
____ MAKE SURE THAT–ON 060 SIZE ONLY–THE TWO WIRE TIES FASTENED TO THE OUTDOOR COILS
AND REVERSING VALVE / ACCUMULATOR ASSEMBLY HAVE BEEN REMOVED
____ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
____ CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
____ CHECK GAS PIPING FOR LEAKS
____ CHECK THAT INDOOR AIR FILTER IS CLEAN AND IN PLACE
____ VERIFY THAT UNIT INSTALLATION IS LEVEL
____ CHECK FAN WHEEL PROPELLER FOR LOCATION IN HOUSING ORIFICE AND SETSCREW TIGHTNESS
____ SET OUTDOOR-AIR SENSOR SETTING TO PROPER SELECTION BASED ON BALANCE POINT PER
THE THERMOSTAT INSTALLATION INSTRUCTIONS
III. START-UP
ELECTRICAL
SUPPLY VOLTAGE L1-L2 __________ L2-L3 __________ L3-L1 __________
COMPRESSOR AMPS L1 __________ L2 __________ L3 __________
COMPRESSOR AMPS C__________ S__________ R__________
INDOOR FAN AMPS __________
TEMPERATURES
OUTDOOR AIR TEMPERATURE: __________ DB __________ WB
RETURN-AIR TEMPERATURE: __________ DB __________ WB
COOLING SUPPLY AIR: __________ DB __________ WB
GAS HEAT SUPPLY AIR: __________
PRESSURES
GAS INLET PRESSURE __________ IN. WG
GAS MANIFOLD PRESSURE__________ IN. WG
REFRIGERANT SUCTION __________ PSIG
REFRIGERANT DISCHARGE __________ PSIG
SUCTION LINE TEMP*__________
DISCHARGE LINE TEMP† __________
____ VERIFY REFRIGERANT CHARGE USING CHARGING TABLES
* Measured at suction inlet to compressor
† Measured at liquid line leaving outdoor coil
33
Copyright 2001 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
48JZ1si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 534–80083
Printed in U.S.A.
Form 48JZ-1SI
Pg 34
10-01
Replaces: New
Tab 1a 6a
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