Carrier 48EZN User manual

1
48EZ(N)
Single--Packaged Gas Heating/Electric Heat Pump
System with Puronr(R--410A) Refrigerant
Single-- And Three--Phase Units Sizes 024--060
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner’s Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1........................
INTRODUCTION 2..................................
RECEIVING AND INSTALLATION 2--13................
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 2...........................
Provide Clearances 2................................
Rig and Place Unit 7................................
Connect Condensate Drain 7..........................
Install Flue Hood 7..................................
Install Gas Piping 8--10..............................
Install Duct Connections 10...........................
Configuring Units for Downflow (Vertical)
Discharge 10....................................
Install Electrical Connections 11.......................
High--Voltage Connections 11.......................
Special Procedures for 208--V Operation 11.............
Control Voltage Connections 12......................
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat 12...................................
Easy Selectt12--14...............................
Transformer Protection 15..........................
PRE--START--UP 15..................................
START--UP 15--19....................................
Check for Refrigerant Leaks 15........................
Unit Sequence of Operation 16........................
Start--Up Heating and Make Adjustments 16..............
Checking Heating Control 16........................
Check Gas Input 16...............................
Adjust Gas Input 17...............................
Check Burner Flame 17............................
Start--Up Cooling and Make Adjustments 18..............
Checking Cooling Control Operation 18...............
Checking and Adjusting Refrigerant 18................
Indoor Airflow and Airflow Adjustments 19............
MAINTENANCE 23--26...............................
Air Filter 23.......................................
Indoor Blower and Motor 23..........................
Flue Gas Passageways 24.............................
Combustion Air Blower 24...........................
Limit Switch 24....................................
Burner Ignition 24..................................
Main Burners 24...................................
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 25.....
A99338
Fig. 1 -- Unit 48EZ
Outdoor Fan 25....................................
Electrical Controls and Wiring 25......................
Refrigerant Circuit 25................................
Gas Input 26.......................................
Indoor Airflow 26..................................
Check Defrost Thermostat 26..........................
PuronRItems 26...................................
TROUBLESHOOTING 29.............................
START--UP CHECKLIST 29...........................
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this
equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations
must be performed by trained service personnel. When working
on this equipment, observe precautions in the literature, on tags,
and on labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Installation must be in compliance with
local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information. This is the safety--alert symbol .
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words: DANGER, WARNING, and CAUTION.
These words are used with the safety--alert symbol. DANGER

2
identifies the most serious hazards which will result in severe per-
sonal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal injury or
product and property damage. NOTE is used to highlight sugges-
tions which will result in enhanced installation, reliability, or op-
eration.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch. Turn off accessory heater power switch if
applicable.
!WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
A qualified installer or agency must use only
factory--authorized kits or accessories when modifying this
product.
WARNING
!
INTRODUCTION
The 48EZ unit (see Fig. 1) is a fully self--contained, combination
Category I gas heating/electric cooling unit 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).
Models with an N in the fifth position of the model number are
dedicated Low NOx units designed for California installations.
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 or any other regions in North
America where a Low NOx rule exists.
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFY UNIT
The unit model number and serial number are stamped on the
unit information plate. Check this information against shipping
papers.
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 equipment distribution office if any item is missing.
To prevent loss or damage, leave all parts in original packages
until installation.
Step 2 — Provide Unit Support
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate if required.
ROOF CURB
Install accessory roof curb in accordance with instructions
shipped with curb (See Fig. 4). Install insulation, cant strips,
roofing, and flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a water tight seal. Install gasketing material supplied
with the roof curb. Improperly applied gasketing also can result
in air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6 mm). This is necessary
for unit drain to function properly. Refer to accessory roof curb
installation instructions for additional information as required.
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of
4 in.(102 mm) thick with 2 in. (51 mm)above grade. The slab
should be flush on the compressor end of the unit (to allow
condensate drain installation) and should extend 2 in. (51 mm)on
the three remaining sides of the unit. Do not secure the unit to the
slab except when required by local codes.
GROUND MOUNT
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.
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. wc.
Step 4 — Provide Clearances
The required minimum operating and service clearances are
shown in Fig. 2 and 3. Adequate combustion, ventilation and
condenser 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.
IMPORTANT: Do not restrict outdoor airflow. An air restriction
at either the outdoor--air inlet or the fan discharge may be
detrimental to compressor life.
The condenser fan pulls air through the condenser coil and
discharges it through the top grille. Be sure that the fan discharge
does not recirculate to the condenser coil. Do not locate the unit
in either a corner or under an overhead obstruction. The
minimum clearance under a partial overhang (such as a normal
house overhang) is 48--in. (1219 mm) above the unit top. The
maximum horizontal extension of a partial overhang must not
exceed 48--in. (1219 mm).
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 or other combustible materials. The unit may be
installed on wood flooring or on Class A, B, or C roof covering
materials.
48EZ

3
R E Q U I R E D C L E A R A N C E F O R O P E R A T I O N A ND S E R V I C I N G
INCHES [mm]
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................42.00 [1066.8]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .......................................................................................48.00 [1219.2]
SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]
DUCT PANEL .................................................................................12.00 [304.8]
*
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
R E Q U I R E D C L E A R A N C E T O C O M B U S T I B L E M A TL .
INCHES [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]
N E C . R E Q U I R E D C L E A R A N C E S .
INCHES [mm]
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]
L E G E ND
CG - Center of Gravity
COND - Condensor
EVAP - Evaporator
NEC - National Electrical Code
REQ’D - Required
NOTE: Dimensions are in in. [mm]
( R e f e r t o M a x i m u m O p e r a t i ng C l ea r a n c e s )
A05166
UNIT ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT UNIT HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
lb kg X Y Z
48EZ024--040 208/230--1--60 365 166 39.02[991.1] 20.0 [508] 19.3 [489] 17.6 [447]
48EZ030--040/060 208/230--1--60 365 166 39.02[991.1] 20.0 [508] 19.3 [489] 17.6 [447]
48EZ036--060/090 208/230--1--60, 208/230--3--60 403 183 41.02[1041.9] 20.0 [508] 14.0 [355.6] 13.0 [330.2]
Fig. 2 -- 48EZ024--036 Unit Dimensions
48EZ

4
R E Q U I R E D C L E A R A N C E F O R O P E R A T I O N A ND S E R V I C I N G
INCHES [mm]
EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]
POWER ENTRY SIDE....................................................................42.00 [1066.8]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .......................................................................................48.00 [1219.2]
SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]
DUCT PANEL .................................................................................12.00 [304.8] *
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
R E Q U I R E D C L E A R A N C E T O C O M B U S T I B L E M A TL .
INCHES [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]
ELECTRIC HEAT PANEL .................................................................36.00 [914.4]
N E C . R E Q U I R E D C L E A R A N C E S .
INCHES [mm]
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]
L E G E ND
CG - Center of Gravity
COND - Condensor
EVAP - Evaporator
NEC - National Electrical Code
REQ’D - Required
NOTE: Dimensions are in in. [mm]
A05142
UNIT ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT UNIT HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
lb kg X Y Z
48EZ042--060/090 208/230--1--60, 208/230--3--60 455 207 42.98 [1091.7] 21.0 [533.4] 20.5 [520.7] 16.6 [421.6]
48EZ048--090/115/130 208/230--1--60, 208/230--3--60 493 224 44.98 [1142.5] 19.5 [495.3] 21.3 [539.8] 18.0 [457.2]
48EZ060--090/115/130 208/230--1--60, 208/230--3--60 529 240 46.98 [1193.3] 21.0 [533.4] 20.0 [508.0] 17.6 [447.0]
Fig. 3 -- 48EZ042--060 Unit Dimensions
48EZ

5
Gasket around
outer edge
Insulated
deck pan
Gasket around
duct
S/A
R/A
HVACunit
base
*Gasketing
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant strip
field supplied
*Provided with roofcurb
Roof
Duct wo rk
field supplied
Insulation(field
supplied)
Roofcurb*
Wood nailer*
Gasketing
inner flange*
Screw
(NOTE A)
Roof Curb for Small Cabinet
Note A:When unit mounting screw is used,
retainer bracke t must also be used.
HVAC unit
base
*Gasketing
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant strip
field supplied
*Provided with roofcurb
Roof
Duct wo rk
field supplied
Insulation(field
supplied)
Roofcurb*
Wood nailer*
Gask eting
inner flange*
Screw
(NOTE A)
Roof Curb for Large Cabinet
Note A:When unit mounting screw is used,
retainer bracket must also be used.
A
BTyp.
Supply opening
(B x C)
Long
Support
D
44
5/16
"
Return opening
(B X C)
Insulated
deck pan
Short
Support
CTyp.
C00076
UNIT SIZE ODS CATALOG
NUMBER
A
IN. (MM)
B
IN. (MM)
C
IN. (MM)
D
IN. (MM)
48EZ024--036 CPRFCURB006A00 8 (203) 11 (279) 16--1/2 (419) 28--3/4 (730)
CPRFCURB007A00 14 (356) 11 (279) 16--1/2 (419) 28--3/4 (730)
48EZ042--060 CPRFCURB008A00 8 (203) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022)
CPRFCURB009A00 14 (356) 16--3/16 (411) 17--3/8 (441) 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 are in inches.
4. Dimension in ( ) are in millimeters.
5. Roof curb is made of 16--gauge steel.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Insulated panels: 1--in. thick fiberglass 1 lb. density.
8. 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 hurricaneorseismic
conditions. This bracket is available through Micrometl.
Fig. 4 -- Roof Curb Dimensions
48EZ

6
12
34
A07216
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)
Unit
024 030 036 Unit 042 048 060
lb kg lb kg lb kg Unit lb kg lb kg lb kg
Total Weight 365 166 365 166 403 183 Total Weight 455 206 493 224 529 240
Corner
Weight 1 73 33 73 33 81 37 Corner Weight 1 91 41 99 45 106 48
Corner
Weight 2 57 26 57 26 63 29 Corner Weight 2 71 32 77 35 82 37
Corner
Weight 3 88 40 88 40 97 44 Corner Weight 3 110 50 119 54 128 58
Corner
Weight 4 147 67 147 67 162 74 Corner Weight 4 183 83 198 90 213 97
Shipping
Weight 387 176 387 176 425 193 Shipping Weight 477 216 515 234 551 249
Fig. 5 -- 48EZ Corner Weights
DETAIL A
A05161
Fig. 6 -- Suggested Rigging
48EZ

7
Step 5 — Rig and Place Unit
PERSONAL INJURY OR PROPERTY DAMAGE
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
When installing the unit on a rooftop, be sure the roof will
support the additional weight.
!WARNING
Rigging and handling of this equipment can be hazardous for
many reasons due to the installation location (roofs, elevated
structures, etc.).
Only trained, qualified crane operators and ground support staff
should handle and install this equipment.
When working with this equipment, observe precautions in the
literature, on tags, stickers, and labels attached to the equipment,
and any other safety precautions that might apply.
Use spreader bars or crate top when rigging the unit. The units
must be rigged for lifting. 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.
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Never stand beneath rigged units or lift over people.
!WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury or death.
Never exceed 200 lbs. (91 kg) per bracket lifting force.
!WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury/death.
Accessory lifting kit is only to be used with Small Packaged
units which have a composite unit base with molded rigging
holds.
!WARNING
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Model 48EZ 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--pan condensate connection to prevent the pan from
overflowing (See Fig. 7). Prime the trap with water. When using
a gravel apron, make sure it slopes away from the unit.
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--pan condensate
connection. This prevents the pan from overflowing.
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. (51 mm) trap. Do
not undersize the tube. Pitch the drain tube downward at a slope
of at least 1--in. (25 mm) for every 10 ft (3 m)of horizontal run.
Be sure to check the drain tube for leaks.
1” MIN.
2” MIN.
TRAP
OUTLET
C99013
Fig. 7 -- Condensate Trap
Step 7 — INSTALL FLUE HOOD
The flue hood assembly is shipped in the return section of the
indoor blower compartment (See Fig. 9). Remove the return duct
cover to locate the assembly.
Dedicated low NOx models MUST be installed in California Air
Quality Management Districts where a Low NOx rule exists.
These models meet the California maximum oxides of nitrogen
(NOx ) emissions requirements of 40 nanograms/joule or less as
shipped from the factory.
NOTE: Low NOx requirements apply only to natural gas
installations.
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury
or death and unit component damage.
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.
!WARNING
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.
2. Remove flue hood from shipping location (inside the
return section of the blower compartment--See Fig. 8).
Place vent cap assembly over flue panel. Orient 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.
48EZ

8
Table 1 – Physical Data -- Unit 48EZ
UNIT SIZE 48EZ 024040 030040 030060 036060 036090 042060 042090
NOMINAL CAPACITY --- ton 22 --- 1 / 2 2 --- 1 / 2 3 3 3 --- 1 / 2 3 --- 1 / 2
OPERATING WEIGHT --- lb.
OPERATING WEIGHT ---kg
365
166
365
166
365
166
403
183
403
183
455
206
455
206
COMPRESSORS Scroll
Quantity 1
REFRIGERANT (R --- 410A)
Quantity --- lb
Quantity --- kg
7.5
3.4
8.0
3.6
8.0
3.6
9.5
4.3
9.5
4.3
10.8
4.9
10.8
4.9
REFRIGERANT METERING DEVICE I n do o r --- T X V Ou t d o or --- A c cu r a t er
OUTDOOR ORIFICE --- in. (qty)
OUTDOOR ORIFICE --- mm
0.035 (2)
.89
0.035 (2)
.89
0.035 (2)
.89
0.038 (2)
.89
0.038 (2)
.89
0.038 (2)
.89
0.038 (2)
.89
OUTDOOR COIL
Rows...Fins/in.
F a c e A r e a --- s q f t
2...2
2.3
2...2
12.3
2...2
12.3
2...2
13.6
2...21
3.6
2...21
5.4
2...21
5.4
OUTDOOR FAN
Nominal Cfm
Diameter--- in.
Diameter--- mm
Motor Hp (Rpm)
2350
22
559
1/8 (825)
2350
22
559
1/8 (825)
2350
22
559
1/8 (825)
2350
22
559
1/8 (825)
2350
22
559
1/8 (825)
2800
22
559
1/8 (825)
2800
22
559
1/8 (825)
INDOOR COIL
Rows...Fins/in.
F a c e A r e a --- s q f t
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
INDOOR BLOWER
N o m i n a l A i r f l o w --- C f m
S i z e --- i n .
S i z e --- m m
M o t o r --- h p
790
10x10
254x254
1/2
1000
10x10
254x254
1/2
1000
10x10
254x254
1/2
1100
11x10
279x254
3/4
1100
11x10
279x254
3/4
1400
11x10
279x254
3/4
1400
11x10
279x254
3/4
FURNACE SECTION*
Burner Orifice
Natural Gas Qty...Drill Size
Propane GasQty...Drill Size
2...44
2...50
2...44
2...50
2...44
2...50
2...38
2...46
3...38
3...46
2...38
2...46
2...38
2...46
HIGH --- PRESSURE SWITCH
( p s i g ) C u t --- o u t
Reset (Auto)
610 +/---15
420 +/---25
L O S S --- O F --- C H A R G E /
LOW --- PRESSURE SWITCH
(Liquid Line) (psig)
C u t --- o u t
Reset (auto)
2 0 + / --- 5
45 +/---10
RETURN---AIR FILTERS (in.)† }
Throwaway 20x24x1 20x24x1 20x24x1 24x30x1 24x30x1 24x36x1 24x36x1
*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. wc.
}If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.
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.
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. wc maximum pressure drop. Never
use pipe smaller than the 1/2--in. FPT gas inlet on the unit gas
valve.
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFGC ANSI
Z223.1--2006 NFPA latest edition (in Canada, CAN/CGA
B149.1,2--M05). In the absence of local building codes, adhere to
the following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4
in. per 15 ft (6 mm per 4.57m) to prevent traps. Grade all
horizontal runs downward to risers. Use risers to connect
to heating section and to meter.
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 (1.8 m). 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.
OUT
TEE
NIPPLE
CAP
IN
C99020
Fig. 8 -- Sediment Trap
48EZ

9
Table 1 -- Physical Data -- Unit 48EZ (Cont’d)
UNIT SIZE 48EZ 048090 048115 048130 060090 060115 060130
NOMINAL CAPACITY --- ton 444555
OPERATING WEIGHT--- (lb
OPERATING WEIGHT--- kg
493
224
493
224
493
224
529
240
529
240
529
240
COMPRESSORS Scroll
Quantity 1
REFRIGERANT (R --- 410A)
Quantity --- lb
Quantity --- kg
11.5
5.2
11.5
5.2
11.5
5.2
14.0
6.4
14.0
6.4
14.0
6.4
REFRIGERANT METERING DEVICE I n do o r --- T X V Ou t d o or --- A c cu r a t er
OUTDOOR ORIFICE---in. 0.038 (Left OD Coil) (.97 mm)
0.046 (Right OD Coil) (1.2 mm)
0.042 (Left OD Coil) (1.0 mm)
0.052 (Right OD Coil) (1.3 mm)
OUTDOOR COIL
Rows...Fins --- in.
F a c e A r e a --- s q f t
2...21
17.2
2...21
17.2
2...21
17.2
2...21|
19.4
2...21
19.4
2...21
19.4
OUTDOOR FAN
Nominal Cfm
Diameter--- in.
Diameter--- mm
M o t o r H p --- R p m
3300
22
559
1/4 (1100)
3300
22
559
1/4 (1100)
3300
22
559
1/4 (1100)
3300
22
559
1/4 (1100)
3300
22
559
1/4 (1100)
3300
22
559
1/4 (1100)
INDOOR COIL
Rows...Fins --- in.
F a c e A r e a --- s q f t
4...15
4.7
4...15
4.7
4...15
4.7
4...15
5.7
4...15
5.7
4...15
5.7
INDOOR BLOWER
N o m i n a l A i r f l o w --- C f m
S i z e --- i n .
S i z e --- m m
M o t o r --- h p
1450
11x10
279x254
3/4 (1075)
1450
11x10
279x254
3/4 (1075)
1450
11x10
279x254
3/4 (1075)
1750
11x10
279x254
1.0 (1040)
1750
11x10
279x254
1.0 (1040)
1750
11x10
279x254
1.0 (1040)
FURNACE SECTION*
Burner Orifice
Natural Gas Qty...Drill Size
Propane GasQty...Drill Size
3...38
3...46
3...33
3...42
3...31
3...41
3...38
3...46
3...33
3...42
3...31
3...41
HIGH --- PRESSURE SWITCH (psig)
C u t --- o u t
Reset (Auto)
610 +/---15
420 +/---25
L O S S --- O F --- C H A R G E /
LOW --- PRESSURE SWITCH
(Liquid Line) (psig)
C u t --- o u t
Reset (auto)
2 0 + / --- 5
45 +/---10
RETURN---AIR FILTERS (in.)†
Throwaway 24x36x1 24x36x1 24x36x1 24x36x1 24x36x1 24x36x1
*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. wc.
}If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.
Table 2 – Maximum Gas Flow Capacity*
NOMINAL
IRON PIPE,
SIZE (IN.)
INTERNAL
DIAMETER
(IN.)
LENGTH OF PIPE, FT†
10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/2 .622 175 120 97 82 73 66 61 57 53 50 44 40 — —
3/4 .824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
11.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
11/4 1.380 1400 950 770 600 580 530 490 460 430 400 360 325 300 280
11/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
* 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. wc (based on a 0.60 specific gravity gas). Refer to Table, Na-
tional Fire Protection Association NFPA 54. † This length includes an ordinary number of fittings.
Table 3 – Heating Inputs
HEATING
INPUT (BTUH)*
NUMBER OF
ORIFICES
GAS SUPPLY PRESSURE (IN. WC) MANIFOLD PRESSURE (IN.
WC)
Natural Propane†
Min Max Min Max Natural Propane†
40,000 24.0 13.0 4.0 13.0 3.5 3.5
60,000 24.0 13.0 4.0 13.0 3.5 3.5
90,000 34.0 13.0 4.0 13.0 3.5 3.4
115,000 34.0 13.0 4.0 13.0 3.5 3.7
130,000 34.0 13.0 4.0 13.0 3.5 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 additional 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.
Table 4 – Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating Input
HEATING
INPUT
(BTUH)
TEMPERATURE RISE °F
20 25 30 35 40 45 50 55 60 65 70
40,000 1500 1200 1000 857 750 667 600 545 500 — —
60,000 2250 1800 1500 1286 1125 1000 900 818 750 692 —
90,000 — — 2250 1929 1688 1500 1350 1227 1125 1038 964
115,000 — — — 2464 2156 1917 1725 1568 1438 1327 1232
130,000 — — — 2786 2438 2167 1950 1773 1625 1500 —
48EZ

10
4. Install sediment trap in riser leading to heating section
(See Fig. 8). This drip leg functions as a trap for dirt and
condensate.
5. Install an accessible, external, manual main shutoff valve
in gas supply pipe within 6 ft (1.8 m) 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.
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.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
--Connect gas pipe to unit using a backup wrench to avoid
damaging gas controls.
--Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially available
soap solution made specifically for the detection of leaks to
check all connections.
--Use proper length of pipe to avoid stress on gas control
manifold.
--If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at furnace
gas valve and extend a minimum of 2 in. (51 mm) outside
furnace casing.
--If codes allow a flexible connector, always use a new
connector. do not use a connector which has previously
serviced another gas appliance.
!WARNING
8. Check for gas leaks at the field--installed and
factoryinstalled gas lines after all piping connections have
been completed. Use soap--and--water solution (or method
specified by local codes and/or regulations).
Step 9 — INSTALL DUCT CONNECTIONS
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
connection sizes and locations).
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch.
!WARNING
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal (metal) duct covers to access vertical
(downflow) discharge duct knockouts in unit base.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base (See Fig. 9 & 10).
4. If unit ductwork is to be attached to vertical opening
flanges on the unit base (jackstand applications only), do
so at this time.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed. Do not leave screws
on rooftop as permanent damage to the roof may occur.
CAUTION
!
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
C99011
Fig. 9 -- Supply and Return Duct Opening
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.
6. Cover both horizontal duct openings with the provided
duct covers. Ensure opening is air-- and watertight.
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. 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 weather tight and airtight seal.
4. 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.
5. 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.
48EZ

11
6. 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.
7. Flash, weatherproof, and vibration--isolate all openings in
building structure in accordance with local codes and good
building practices.
Step 10 — INSTALL ELECTRICAL CONNEC-
TIONS
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
!WARNING
UNIT COMPONENT DAMAGE HAZARD
Failureto follow this caution could resultin damage to theunit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (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. On
3--phase units, ensure phases are balanced within 2
percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Insulate low--voltage wires for highest voltage contained
within conduit when low--voltage control wires are in
same conduit as high--voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, conduit,
etc.
!CAUTION
HIGH--VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a
field--supplied, 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.
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. 10 for reference when making high
voltage connections. Proceed as follows to complete the high
voltage connections to the unit.
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.
3. Connect L1 to pressure lug connection 11 of the
compressor contactor.
4. Connect L2 to pressure lug connection 23 of the
compressor contactor.
VERTICAL DUCT COVERS
C99012
Fig. 10 -- Vertical Duct Cover Removed
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
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Make surethepower supply to theunit isswitched OFF before
making any wiring changes. With disconnect switch open,
move black wire from transformer (3/16 in.) terminal marked
230 to terminal marked 200. This retaps transformer to
primary voltage of 208 vac.
!WARNING
48EZ

12
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Beforemaking any wiring changes, make sure the gas supply
is switched off first. Then switch off the power supply to the
unit and install lockout tag.
!WARNING
CONTROL VOLTAGE CONNECTIONS
Do not use any type of power--stealing thermostat. 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 (30 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color--coded, insulated
(35 C minimum) wires.
Remove knockout hole located in the heat section panel adjacent
to the service access panel. Remove the rubber grommet from the
installer’s packet and install grommet in the knockout opening.
Provide a drip loop before running wire through panel. Run the
low--voltage leads from the thermostat, through the inlet hole, and
into unit low--voltage splice box. Locate 18--gage wires leaving
control box. These low--voltage connection leads can be
identified by colors (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). 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.
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GND
CONTROL BOX
SPLICE BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
THERMOSTAT
(THERMIDISTAT ™ )
G
R
C
YEL(Y)
GRN(G)
RED(R)
BRN(C)
ORN(O)
W/W1
WHT(W1)
FIELD CONTROL - VOLTAGE WIRING
FIELD HIGH - VOLTAGE WIRING
DHUM
Y/Y2
O/W2
C01110
Fig. 11 -- High and Control--Voltage Connections
BALANCE POINT SETTING--THERMIDISTAT OR
HYBRID THERMOSTAT
BALANCE POINT TEMPERATURE--The “balance point”
temperature is a setting which affects the operation of the heating
mode. This is a field--selected input temperature (range 5 to 55_F)
(--15to12_C) where the Thermidistat or dual fuel thermostat will
monitor outdoor air temperature and decide whether to enable or
disable the heat pump. If the outdoor temperature is above the
“balance point”, the heat pump will energize first to try to satisfy
the indoor temperature demand. If the heat pump does not make a
sufficient improvement within a reasonable time period (i.e. 15
minutes), then the gas furnace will come on to satisfy the indoor
temperature demand. If the outdoor temperature is below the
“balance point”, the heat pump will not be allowed to operate (i.e.
locked out), and the gas furnace will be used to satisfy the indoor
temperature. There are three separate concepts which are related
to selecting the final “balance point” temperature. Read each of
the following carefully to determine the best “balance point” in a
hybrid installation:
1. Capacity Balance Temperature: This is a point where the
heat pump cannot provide sufficient capacity to keep up
with the indoor temperature demand because of declining
outdoor temperature. At or below this point, the furnace is
needed to maintain proper indoor temperature.
2. Economic Balance Temperature: Above this point, the
heat pump is the most cost efficient to operate, and below
this point the furnace is the most cost efficient to operate.
This can be somewhat complicated to determine and it
involves knowing the cost of gas and electricity, as well as
the efficiency of the furnace and heat pump. For the most
economical operation, the heat pump should operate
above this temperature (assuming it has sufficient
capacity) and the furnace should operate below this
temperature.
3. Comfort Balance Temperature: When the heat pump is
operating below this point, the indoor supply air feels
uncomfortable (i.e. too cool). This is purely subjective and
will depend on the homeowner’s idea of comfort. Below
this temperature the gas furnace should operate in order to
satisfy the desire for indoor comfort.
Easy Selectt-- 48EZ
EASY SELECTtCONFIGURATION TAPS FOR 48EZ
Easy Select taps are used by the installer to configure a system.
The ECM motor uses the selected taps to modify its operation to
a pre--programmed table of airflows.
The unit must be configured to operate properly with system
components with which it is installed. To successfully configure a
basic system (see information printed on circuit board label
located next to select pins), move the 6 select wires to the pins
which match the components used (See Fig. 12).
a. GAS HEAT/CFM--SELECT GAS HEAT INPUT
SIZE Factory selected gas heat size should correspond
to unit label.
b. AC/HP SIZE-- SELECT SYSTEM SIZE
INSTALLED
Factory selected air conditioner size should correspond
to capacity of unit installed. Installer should verify air
conditioner size to ensure that airflow delivered falls
within proper range for the size unit installed. This
applies to all operational modes.
c. SYSTEM TYPE--SELECT SYSTEM TYPE
INSTALLED
Factory selected on 48EZ for AC--Air conditioner.
For Gas Heat/Electric Cool Unit--AC must be selected.
d. AC/HP CFM ADJUST--SELECT NOMINAL, LOW,
OR HIGH AIRFLOW
The AC/HP CFM Adjust select is factory set to the
NOM tap. The CFM Adjust selections NOM/LO will
regulate airflow supplied for all operational modes,
except non--heat pump heating modes. HI provides 15
percent airflow over nominal unit size selected and LO
provides 10 percent airflow below nominal unit size
selected. Adjust selection options are provided to
adjust airflow supplied to meet individual installation
needs for such things as noise, comfort, and humidity
removal (See Fig. 12, D as indicated).
48EZ

13
Balance Point Worksheet
0
10
20
30
40
50
60
70
-20 -10 0 10 20 30 40 50 60
Outdoor Air Temp (Deg F)
Building Heat Loss, 1000BTUH
Unit Intetgrated Heating Capacity,
1000BTUH
060
048
042
036
030
024
Based on Entering Indoor Air of 70 Deg.F and Rated CFM
C03008
Balance Point Worksheet
EASY SELECT
HEATER/MOTOR
GAS HEAT/CFM
090
1250
SEC1 SEC2 J1
AC/HP SIZE
036 030 024 018
AC
HP-COMFORT HP-EFF
NOM HI
ENH
LO
SYSTEM TYPE
AC/HP CFM ADJUST
ON/OFF DELAY
CONTINUOUS FAN
MED HI YELLO
AUX1 HUM1
AUX2
24VAC
GRY
HUM2
YEL
WHT
BLK
ORN
BLU
VIO
060
1100
040
800
0
90
30
90
0
0
N/A
TM
J2
DH
R
W1
W2
Y
1
Y/ Y2
G
O
C
9 PIN CONNECTOR
ICM PRINTED CIRCUIT BOARD
12 PIN CONNECTOR
A
B
C
D
E
F
C01039
Fig. 12 -- Detail of SPP Printed--Circuit Board
e. ON/OFF DELAY-- SELECT DESIREDTIME
DELAY PROFILE
Four motor operation delay profiles are provided to
customize and enhance system operation (See Fig. 12,
E as indicated).
Selection options are:
(1.) The standard 90 sec off delay (Factory Setting) at
100 percent airflow in cooling mode. In heating
mode, IGC will control 45 sec on delay with no
airflow and 45 sec off delay.
(2.) A 30 sec cooling delay with no airflow/ 90 sec
off delay at 100 percent airflow profile is used
when it is desirable to allow system coils time to
cool--down in conjunction with the airflow in
heating mode.
(3.) A no delay option used for servicing unit or
when a thermostat is utilized to perform delay
functions in cooling mode. In heating mode IGC
will control 45 sec on delay with no airflow and
45 sec off delay.
(4.) ENH-- Not recommended for 48EZ
f. CONTINUOUS FAN--SELECT DESIRED FAN
SPEED WHEN THERMOSTAT IS SET ON
CONTINUOUS FAN
(1.) LO speed--Factory setting, 50 percent cooling
mode airflow.
(2.) MED speed--Move connector to MED, 65 percent
cooling mode airflow.
(3.) HI speed--Move connector to HI, 100 percent
cooling mode airflow (See Fig. 12, F as
indicated).
g. LOW--VOLTAGE CIRCUIT FUSING AND
REFERENCE
The low--voltage circuit is fused by a board--mounted
48EZ

14
5--amp automotive fuse placed in series with the
transformer SEC2 and the R circuit. The C circuit of
the transformer is referenced to chassis ground through
a printed circuit run at SEC1 connected to metal
standoff marked with ground symbol.
h. BASIC UNIT CONFIGURATION
The following basic configuration of the indoor motor
will provide ARI rated performance of the 48EZ. This
BASIC CONFIGURATION should be used when the
rated ARI performance is required, or if system
enhancements such as super dehumidify are not
needed.
(1.) HEAT--Factory selected to match heat input size.
(2.) AC/HP Size--Factory selected to match system
size, please verify.
(3.) SYSTEM TYPE--Factory selected on 48EZ
system AC--AIR CONDITIONER.
(4.) AC/HP CFM ADJUST--Select NOM.
(5.) ON/OFF DELAY--Factory selected 0/90 profile.
(Do Not Use ENH profile for Gas Packaged
Units)
(6.) CONTINUOUS FAN--Select desired fan speed
when thermostat is set to continuous fan.
i. COMFORT OPTIONS--SUPER DEHUMIDIFY (See
Quick Reference Guide)
The Super Dehumidify option is possible when this
unit is installed with a field supplied Thermidistatt
control (SuperDehumidify does not require an outdoor
temperature sensor). The following configuration is
recommended for maximum cooling/dehumidifying
comfort. This configuration will improve the comfort
provided by the air conditioning system if more
humidity removal is desired. While providing this
improved comfort, the system will operate efficiently,
but not at the published ARI SEER efficiency. During
cool--to--dehumidify call, it provides maximum
dehumidification by reducing airflow to a minimum.
The actual super dehumidify command from
Thermidistat control to the indoor unit is a “Y” signal
without a “G” signal in addition to dehumidify signal.
The indoor unit responds to this combination by
reducing the airflow to a minimum. All other
characteristics of cool to dehumidify are the same. The
following system configuration is recommended for
maximum cooling/dehumidifying comfort (See Fig.
12).
(1.) HEAT--Factory selected to match gas heat size of
unit installed.
(2.) AC/HP Size--Factory selected to match system
size, please verify.
(3.) SYSTEM TYPE--Factory selected on 48EZ
system AC--AIR CONDITIONER.
(4.) AC/HP CFM ADJUST--Select NOM.
(5.) ON/OFF DELAY--Select “0/0” profile.
(6.) CONTINUOUS FAN--Select desired fan speed
when thermostat is set to continuous fan.
(7.) DEHUMIDIFY MODE--Remove J1 jumper to
activate.
NOTE: J1 jumper should only be removed when a Thermidistat,
humidistat or capable zoning control is installed.
(8.) LOW VOLTAGE CONNECTIONS--Make
connections as shown in ELECTRICAL
CONNECTIONS section.
(9.) CONFIGURE THERMIDISTAT--Follow
Thermidistat (or capable zoning system)
installation instructions for Super Dehumidify
operation.
ACCESSORY INSTALLATION
a. AUXILIARY TERMINALS The AUX and HUM
terminals on the Easy Select Board are tied directly to
the G terminal, and provide a 24--v. signal whenever
the G terminal is energized (See Fig. 12). During
Super dehumidify mode, the G signal is not present
and the auxiliary terminals are not energized. If the
installation includes the use of this operating mode, do
not use these terminals to control accessories. See
Electronic Air Cleaner and Humidifier sections for
further information.
b. ELECTRONIC AIR CLEANER CONNECTIONS
The AUX1 and AUX2 terminals are not always
energized during blower operations, as described
above. When using an electronic air cleaner with the
unit, use Airflow Sensor (See Air Cleaner Price Pages
for Part Number). The airflow sensor turns on
electronic air cleaner when the blower is operating.
c. HUMIDIFIER/HUMIDISTAT CONNECTIONS Easy
Select Board terminals HUM1 and HUM2 are
provided for direct connection to the low--voltage
control of a humidifier through a standard humidistat
(See Fig. 12). These terminals are energized with 24--v.
when G thermostat signal is present (See Fig. 13 &
14). Alternately, the 24--v. signal may be sourced from
the W and C on the 9 pin connector. When using a
Thermidistat Control, Zone Comfort Plus or Comfort
Zone II, the 24--v. signal may be sourced directly from
the Thermidistat HUM terminal (See Fig. 12, 13 &
14).
HUMIDISTAT
TO HUMIDIFIER
HUMIDIFIER WIRING
HUM 1
(C)
HUM 2
(G)
24-VAC
A95317
Fig. 13 -- Humidifier Wiring -- 48EZ
EASY SELECT
BOARD TERMINAL
BLOCK
DH
J1
R
HUMIDISTAT
REMOVE
JUMPER
A95316
Fig. 14 -- Humidistat Wiring for De--Humidify Mode -- 48EZ
d. DEHUMIDIFY CAPABILITY WITH STANDARD
HUMIDISTAT CONNECTION
Latent capacities for this unit are better than average
systems. If increased latent capacity is an application
requirement, the ECM board provides connection
terminals for use of a standard humidistat. The unit
will detect the humidistat contacts opening on
increasing humidity and reduce its airflow to
approximately 80 percent of nominal cooling mode
airflow. This reduction will increase the system latent
capacity until the humidity falls to a level which
causes the humidistat to close its contacts. When the
contacts close, the airflow will return to 100 percent of
selected cooling airflow. To activate this mode, remove
48EZ

15
jumper J1 and wire in a standard humidistat (See Fig.
14).
e. DEHUMIDIFY AND SUPER DEHUMIDIFY
CAPABILITIES
This model unit is capable of responding to a signal
from indoor system control (Thermidistat or capable
zoning control) to operate in comfort control modes
such as Super Dehumidify Mode. Consult literature
provided with indoor system control to determine if
these operating modes are available, and to see control
set up instructions. No special setup or wiring of unit
is required.
TRANSFORMER PROTECTION
The transformer is of the energy--limiting type. It is set to
withstand a 30--sec. overload or shorted secondary condition.
PRE--START--UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
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 soldered 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 electrical power to unit and install lockout
tag.
b. Relieve and reclaim 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.
!WARNING
Proceed as follows to inspect and prepare the unit for initial
startup:
1. Remove access panel.
2. Read and follow instructions on all WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, disconnected wires, etc.
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.
d. Inspect all field-- and factory--wiring connections. Be
sure that connections are completed and tight.
e. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not purge gas supply into the combustion chamber. Do not
use a match or other open flame to check for gas leaks.
!WARNING
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.
b. Make sure that condenser--fan blade is correctly
positioned in fan orifice. Leading edge of
condenser--fan blade should be 1/2 in. (12 mm)
maximum from fan orifice.
c. Ensure fan hub is 1/8 in. (3 mm) maximum from
motor housing (See Fig. 15).
d. Make sure that air filter(s) is in place.
e. Make sure that condensate drain trap is filled with
water to ensure proper drainage.
f. Make sure that all tools and miscellaneous loose parts
have been removed.
FAN GRILLE
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB MOTOR SHAFT
C99009
Fig. 15 -- Fan Blade Clearance
START--UP
Step 1 — CHECK FOR REFRIGERANT LEAKS
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.
2. Repair leak following Refrigerant Service procedures.
NOTE: Install a filter drier whenever the system has been
opened for repair.
3. Add a small charge of R--410A refrigerant vapor to system
and leak--test unit.
4. Evacuate and recover refrigerant from refrigerant system if
additional leaks are not found.
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.
48EZ

16
Step 2 — UNIT SEQUENCE OF OPERATION
48EZ Sequence of Operation
a. CONTINUOUS FAN
(1.) Thermostat closes circuit R to G--The Blower
runs at continuous fan airflow.
b. COOLING MODE
(1.) If indoor temperature is above temperature set
point and humidity is below humidity set point,
thermostat closes circuits R to G, R to Y/Y2 and
R to O--The unit delivers single speed cooling
airflow.
c. COOLING MODE--DEHUMIDIFICATION
(1.) If indoor temperature is above temperature set
point and humidity is above humidity set point,
thermostat or Thermidistat closes circuits R to G,
R to Y/Y2, R to O and humidistat or Thermidistat
opens R to DH--The unit delivers airflow which is
approximately 80 percent of the nominal cooling
airflow to increase the latent capacity of the
system.
d. COOLING MODE--SUPER DEHUMIDIFY
OPERATION (SEE QUICK REFERENCE GUIDE)
NOTE: The indoor control used, such as a Thermidistat, must be
capable of providing Super Dehumidify operation mode and
control must be configured as outlined in its installation
instructions. Consult indoor control literature to determine if
control is capable of providing Super Dehumidify inputs and for
configuration instruction.
(1.) If the indoor temperature is below the temperature
set point and the humidity is above the humidity
set point, the Thermidistat closes circuit R to O,
opens circuits R to DH and R to G, and closes
circuit R to Y/Y2. If circuit R to G is closed
(24--v.), the motor will deliver airflow at the full
cooling or cooling plus dehumidify mode
requested value. If circuit R to G is open (0--v.)
for Super Dehumidify mode, the motor delivers
reduced airflow to maximize the humidity
removal of the system while minimizing over
cooling.
e. HEAT PUMP HEATING MODE
Outdoor temperature above balance point setpoint of
Thermidistatt(option 11).
(1.) On a call for heating, terminals “Y” and “G“ of
the Thermidistat or Hybrid 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.
(2.) “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 energizedthrough the “BM” and “L2“
terminals of the IGC.
(3.) When the Thermidistat removes the “Y” and “G”
calls, the compressor contactor and outdoor fan
and evaporator motor are de--energized.
f. GAS HEATING MODE
Outdoor temperature below balance point setpoint of
Thermidistat (option 11).
(1.) On a call for heating, terminal “W” of the
Thermidistat or Hybrid Heat 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).
(2.) The indoor--fan motor is energized 45 sec. after
flame is established.
(3.) When the thermostat is satisfied and “W” is
deenergized, the burners stop firing and the
indoor--fan motor shuts off after a 45--sec.
time--off delay.
NOTE: 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.
Step 3 — START--UP HEATING AND MAKE
ADJUSTMENTS
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit
being installed.
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.
!CAUTION
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):
1. Place room thermostat SYSTEM switch in the HEAT
position and the fan switch is placed in AUTO position.
2. Set the heating temperature control of the thermostat
above room temperature.
3. The induced--draft motor will start.
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.
5. The evaporator fan will turn on 45 sec. after the flame has
been established. The evaporator fan will turn off 45 sec.
after the thermostat has been satisfied.
CHECK GAS INPUT
Check gas input and manifold pressure after unit start--up (See
Table 3). If adjustment is required proceed as follows:
SThe rated gas inputs shown in Table 3 are for altitudes from
sea level to 2000 ft above sea level. These inputs are based on
natural gas with a heating value of 1050 Btu/ft3at 0.65 specific
gravity, or propane gas with a heating value of 2500 Btu/ft3at
1.5 specific gravity.
SFor elevations above 2000 ft, reduce input 4% for each 1000
ft above sea level.
48EZ

17
SWhen 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.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit and/or
component life.
Do Not redrill an orifice. Improper drilling (burrs,
out--of--round holes, etc.) can cause excessive burner noise
and misdirection of burner flame. If orifice hole appears
damaged or it is suspected to have been redrilled, check orifice
hole with a numbered drill bit of correct size.
!CAUTION
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.
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. wc. If larger adjustments are required,
change main burner orifices following the recommendations of
national and local codes.
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. 16) and connect
manometer. Turn on gas supply to unit.
MANIFOLD PIPE PLUG
C99019
Fig. 16 -- Burner Assembly
3. Record number of seconds for gas meter test dial to make
one revolution.
4. Divide number of seconds in Step 3 into 3600 (number of
seconds in one hr).
5. Multiply result of Step 4 by the number of cu ft shown for
one revolution of test dial to obtain ft3of gas flow per hr.
6. 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 3 (Consult the local gas
supplier if the heating value of gas is not known).
EXAMPLE: Assume that the size of test dial is 1 ft3, one
revolution takes 32 sec., and the heating value of the gas is 1050
Btu/ft3. Proceed as follows:
1. 1. 32 sec. to complete one revolution.
2. 3600 ÷32 = 112.5.
3. 112.5x1=112.5ft
3of 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:
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. wc. Unsafe operation of the unit may result if
manifold pressure is outside this range. Personal injury or
unit damage may result.
FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury
or death and/or property damage.
Unsafe operation of the unit may result if manifold pressure
is outside this range.
!WARNING
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 3.
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. 16).
3. Turn on gas to unit.
4. Remove cover screw over regulator adjustment screw on
gas valve.
5. Adjust regulator adjustment screw to the correct manifold
pressure, as specified in Table 3. Turn adjusting screw
clockwise to increase manifold pressure, or turn adjusting
screw counterclockwise to decrease manifold pressure.
6. Replace cover screw.
7. 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. 17). Refer to the Maintenance section for
information on burner removal.
48EZ

18
MANIFOLD
BURNER
BURNER FLAME
C99021
Fig. 17 -- Monoport Burner
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.
Table 4 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.
LIMIT SWITCHES
Normally closed limit switch (LS) completes the control circuit
through the thermostat R circuit. Should the leaving--air
temperature rise above the maximum allowable temperature, the
limit switch opens and the R control circuit “breaks.” Any
interruption in the R control circuit instantly closes the gas valve
and stops gas flow to the burners and pilot. 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 and
completes the R control circuit. 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, the R control circuit trips,
closing the gas valve and stopping gas flow to the burners. The
indoor (evaporator) fan motor (IFM) and induced draft motor
continue to run until switch is reset. The IGC LED will display
FAULT CODE 7.
Step 4 — START--UP COOLING AND MAKE
ADJUSTMENTS
UNIT DAMAGE HAZARD
Failure to follow this warning could result in unit component
damage.
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 when the outdoor temperature is below 55_F
(12_C) (unless accessory low--ambient kit is installed). Do not
rapid--cycle the compressor. To prevent compressor damage
allow 5 minutes between “on” cycles.
!WARNING
CHECKING COOLING CONTROL OPERATION
Start and check the unit for proper cooling control operation as
follows:
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. Place SYSTEM switch in COOL position and FAN switch
in AUTO. position. Set cooling control below room
temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that cooling cycle
shuts down when control setting is satisfied. The
evaporator fan will continue to run for the time selected on
the Easy Select board.
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).
IMPORTANT: Three--phase, scroll compressor units are
direction--oriented. These units must be checked to ensure proper
compressor 3--phase power lead orientation. If not corrected
within 5 minutes, the internal protector shuts off the compressor.
The 3--phase power leads to the unit must be reversed to correct
rotation. When turning backwards, scroll compressors emit
elevated noise levels, and the difference between compressor
suction and discharge pressures may be near zero.
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.
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.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
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.
!CAUTION
To Use Cooling Charging Charts
Take the liquid line temperature and read the manifold pressure
gauges. Refer to the chart (See Fig. 20) to determine what the
liquid line temperature should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to the Check for Refrigerant Leaks section.
48EZ

19
Table 5 – LED Indications
ERROR CODE LED INDICATION
Normal Operation On
Hardware Failure Off
Fan On/Off Delay Modified 1Flash
Limit Switch Fault 2 Flashes
Flame Sense Fault 3 Flashes
Four Consecutive Limit Switch Faults 4 Flashes
Ignition Lockout Fault 5 Flashes
Induced--Draft Motor Fault 6 Flashes
Rollout Switch Fault 7 Flashes
Internal Control Fault 8 Flashes
Safety Critical Code Fault 9 Flashes
NOTES:
1. There is a 3---sec. pause between error code displays.
2. If more than one error code exists, all applicable error codes will be displayed in numerical sequence.
3. This chart is on the wiring diagram located inside the burner access panel.
Table 6 – Filter Pressure Drop Table (in. wc)
FILTER SIZE CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
20X20X1 0.05 0.07 0.08 0.1 0.12 0.13 0.14 0.15 ———————————
24X30X1 ———0.04 0.05 0.06 0.07 0.07 0.08 0.09 0.1 ————————
24X36X1 ———————0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14
Table 7 – 48EZ Cooling (and Heat Pump Heating) Dry Coil ECM Airflow
Small Cabinet
UNIT
SIZE
CFM ADJUST PIN SELECT LO PIN NOM PIN HI PIN
EXTERNAL STATIC
PRESSURE RANGE (in. wc) 0.0–0.4 0.4–0.7 0.7–1.0 0.0–0.4 0.4–0.7 0.7–1.0 0.0–0.4 0.4–0.7 0.7–1.0
024
COOLING* 745 675 –835 750 690 940 880 815
COOLING DEHUMIDIFY 675 625 –675 650 600 755 730 705
HEAT PUMP COMFORT 670 605 –740 690 635 845 795 735
030
COOLING* 940 860 785 1020 965 895 1185 1100 1010
COOLING DEHUMIDIFY 820 785 735 820 800 770 955 920 880
HEAT PUMP COMFORT 850 780 745 935 905 845 1055 1040 955
036
COOLING* 1025 935 –1145 1085 1005 1320 1260 1180
COOLING DEHUMIDIFY 925 885 –925 900 870 1060 1040 1010
HEAT PUMP COMFORT 955 880 –1075 990 920 1220 1180 1125
*Heat Pump Efficiency and Cooling pin selections deliver equal airflow.
Table 8 – 48EZ Cooling (and Heat Pump Heating) Dry Coil ECM Airflow
Large Cabinet
UNIT SIZE
CFM ADJUST
PIN SELECT LO PIN NOM PIN HI PIN
EXTERNAL STATIC
PRESSURE RANGE (in. wc) 0.1–1.0 0.1–1.0 0.1–1.0
042
COOLING* 1100 1225 1410
COOLING DEHUMIDIFY 980 980 1125
HEAT PUMP COMFORT 990 1100 1265
048
COOLING* 1260 1400 1610
COOLING DEHUMIDIFY 1120 1120 1290
HEAT PUMP COMFORT 1135 1260 1450
060
COOLING* 1575 1750 2010
COOLING DEHUMIDIFY 1400 1400 1610
HEAT PUMP COMFORT 1415 1575 1810
*Heat Pump Efficiency and Cooling pin selections deliver equal airflow.
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 4 shows the temperature rise at various airflow rates. Table
7 & 8 show cooling airflows and Table 9 & 10 show heating
airflows at the selection pin ranges (depending on external static
pressure). Refer to these tables to determine the airflow for the
system being installed.
NOTE: Be sure that all supply-- and return--air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before making any indoor wiring adjustments, shut off gas
supply. Then disconnect electrical power to the unit.
!WARNING
Airflow can be changed by changing the selection pins on the
Easy Select circuit board.
48EZ

20
A07202
Fig. 18 -- 208/230--1--60 Wiring Diagram, Unit 48EZ
48EZ