Carrier 50ZH Series Dimensions and installation guide

50ZH030-060
3-Phase Packaged Heat Pump
Visit "vv'vv'vv.12_lrri_r.L"oin
installation, Start-Up and Service instructions
HEATING & COOLING
NOTE: Read the entire instruction manual belk_re starting the
installation.
TABLE OF CONTENTS
SAFETY CONS1 f)ERATIONS ..................................................... ]
INTRODUCTION .......................................................................... 2
RECEIVING AND INSTALLATION .......................................... 2
Check Equipn_ent ...................................................................... 2
IDENTIFY UNIT ................................................................ 2
INSPECT SHIPMENT ........................................................ 2
Provide Unit Support ................................................................ 2
SLAB MOUNT ................................................................... 2
GROUND MOUNT ............................................................ 2
Provide Clearances .................................................................... 2
Place Unit .................................................................................. 2
Select and Install Ductwork ..................................................... 2
INSTALL FLANGES FOR DUCTWORK CONNEC-
TIONS (50ZH060 ONLY) .................................................. 2
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE ...................... 6
Provide liar Condensate Disposal ............................................. 6
Install Electrical Connections ................................................... 7
HIGH-VOLTAGE CONNECTIONS .................................. 7
ROUTING POWER LEADS INTO UNIT ........................ 7
CONNECTING GROUND LEAD TO UNIT GROUND.7
ROUTING CONTROL POWER WIRES .......................... 7
ACCESSORY ELECTRIC HEAT WIRING ..................... 7
SPECIAL PROCEDURES FOR 208-V OPERATION .....7
PRE-START-UP ............................................................................ 9
START-UP ..................................................................................... 9
Check lor Refi"igerant Leaks .................................................... 9
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS: ............................. 9
Start-Up Cooling Section and Make Adjustnlents ................ 10
CHECKING COOLING CONTROL OPERATION ....... 10
COMPRESSOR ROTATION ........................................... 10
Refrigerant Charge .................................................................. 10
NO CHARGE .................................................................... 10
LOW CHARGE COOLING ............................................. 10
TO USE THE COOLING CHARGING CHART ............ 11
HEATING MODE CHARGE ........................................... 11
Indoor Airflow and Airflow Adjustn-ients .............................. IX
FOR 208/230-V ................................................................. 11
FOR 460-V MOTORS ...................................................... 11
Unit Controls ........................................................................... l l
HIGH-PRESSURE RELIEF VALVE ............................... IX
LOSS OF CHARGE SWITCH ......................................... 11
COMPRESSOR OVERLOAD .......................................... 11
Sequence of Operation ............................................................ 14
FAN OPERATION ............................................................ 14
COOLING .......................................................................... 14
HEAT PUMP HEATING .................................................. 14
DEFROST .......................................................................... 14
ELECTRIC RESISTANCE HEATING ............................ 14
C00155
Fig. 1--Unit 50ZH
MAINTENANCE ......................................................................... 14
Air Filter .................................................................................. 16
Unit Top Removal (Outdoor-Coil Side) ................................ 16
Indoor Blower and Motor ....................................................... 16
Outdoor Coil, Indoor Coil and Condensate Drain Pan ........ 17
Outdoor Fan ............................................................................ 19
Electrical Controls and Wiring ............................................... 19
ReliTigerant Circuit .................................................................. 19
Indoor Airflow ........................................................................ 19
Metering Devices .................................................................... 19
Lubrication .............................................................................. 19
Liquid Line Strainer ................................................................ 19
High Flow Valves ................................................................... 19
TROUBLESHOOTING ............................................................... 22
START-UP CHECKLIST ............................................................ 23
NOTE TO 1NSTALLER--Beli_re installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User's Manual and Replacement Guide are leli with
the unit alier installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified workers should install, repair, or service
air-conditioning equipment.
Untrained workers can perlimn basic maintenance hlnctions of
cleaning coils and l]lters. All other operations should be perlormed
by trained service people. When working on air-conditioning
equipment, pay attention to precautions in the literature, tags, and
labels attached to the unit, and other sali_ty precautions that may
apply.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 101 Printed in U.S.A. Catalog No. 50ZH-6SI Pg 1 2-06 Replaces: New

Follow all salcty codes. Wear salety glasses and work gloves. Use
quenching cloth lk_r unbrazing operations. Have fire extinguisher
available lbr all brazing operations.
Belore perlkmning service or maintenance operations on
system, turn off main power to unit and install lockout tag.
Turn off accessory heater power switch if applicable. Elec-
trical shock can cause serious injury or death.
Recognize salety inlormation. This is tile salcty-alert symbol ,/_ .
Whelk yon see this symbol in instructions or manuals, be alert to
the potential lot personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the salDty-alert symbol.
DANGER identifies the most serious hazards wlaich will result in
severe personal injury or death. WARNING signifies a hazard
which could result ilkpersonal injury or death. CAUTION is used
to identify unsaid 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.
These instructions cover mininmm requirements and conl()rnl to
existing national standards and salbty codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residen-
tial construction practices. We require these instructions as a
minimum lbr a said installation.
INTRODUCTION
50ZH heat pump units are fully sell'contained and designed lbr
outdoor installation (See Fig. 1). As shown in Fig. 2-4, units are
shipped in a horizontal-discharge configuration lot installation on
a ground-level slab. All units can be field-converted to downflow
discharge configurations lot rooftop applications with a field-
supplied plenum.
RECEIVING AND INSTALLATION
Step 1--Check Equipment
IDENTIFY UNIT
The unit model number and serial number arc stamped on the unit
identification plate. Check this inlornmtion against shipping pa-
pers. Verify that unit voltage and amperage listed on unit rating
plate agree with power supplied Ibr equipment.
INSPECT SHIPMENT
Inspect Ibr shipping damage while unit is still on shipping pallet.
If unit appears to be damaged or is torn loose from its securing
points, have it exandned by transportation inspectors belkwe
removal. Forward claim papers directly to transportation company.
Manufacturer is not responsible lk)rany damage incurred ilktransit.
Check all items against shipping list. Immediately notify the
nearest Carrier Air Conditioning office il' any item is missing.
To prevent loss or damage, leave all parts ilk original packages
until installation.
Step 2--Provide Unit Support
SLAB MOUNT
Place the unit on a rigid, level surl'ace_ suitable to support the unit
weight. A concrete pad or a suitable fiberglass mounting pad is
recommended. The fiat surface should extend approximately 2-in.
beyond the unit casing on the 2 sides. The duct connection side and
condensate drain connection sides should be flush with the edge of
the flat surface.
A 6-in. wide gravel apron should be used around the flat sl.n'face to
prevent airlIow blockage by grass or shrubs. Do not secure the unit
to the flat snrlace except where required by local codes.
The unit should be level to within 1/4 inch. This is necessary lot
the unit drain to lunction properly.
GROUND MOUNT
The unit may also be installed directly on the ground if local codes
permit. Place unit on level ground prepared with gravel lor
condensate discharge.
Step 3--Provide Clearances
The required minimum service clearances and clearances to
combustibles are shown in Fig. 2-4. Adequate ventilation and
outdoor coil air must be provided.
The outdoor fan pulls air through the outdoor coil and discharges
it through the fan on the top cover. Be sure that the fan discharge
does not recirculate to the outdoor 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. above the unit top. The maxinmm horizontal
extension of a partial overhang nmst not exceed 48 inches.
Do not place the unit where water, ice, or snow fi'om an overhang
or roof will damage or flood the unit. 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 harmful to
compressor lilt.
Step 4--Place Unit
Unit can be moved with the rigging holds provided in the unit base.
Relcr to Table 1 Ik_roperating weights. U.se extreme caution to
pre_ent damage when movillg the unit. Unit must remain in an
upright position durit_g all moving operatiot_s. The unit must be
level with in 1/4" 12_rproper condensate drainage; the ground-level
pad nmst be level belbre setting the unit in place. When a
field-fabricated support is used, be sure that the support is level
and that it properly supports the unit.
Step 5--Select and Install Duetwork
The design and installation of the duct system must be in
accordance with:
*the standards of the NFPA (National Fire Protection Associa-
tion) lbr installation of nonresidence-type air conditioning and
ventilating systems
* NFPA90A or residence-type, NFPA90B; and/or local codes
and residence-type, NFPA 90B
* and/or local codes and ordinances
Select and size ductwork, supply-air registers and return-air grilles
according to ASHRAE (American Society o1' Heating, Refrigera-
tion, and Air Conditioning Engineers) recommendations.
Use the duct flanges provided on the supply- and return-air
openings on the side of the unit. See Fig. 2-4 lot connection sizes
and locations. The 14-in. round duct collars (size 030-048 units)
are shipped inside the unit attached to the indoor blower. They are
field-installed and nmst be removed l'rom the indoor cavity prior to
start-up, even if they are not used lbr installation.
INSTALL FLANGES FOR DUCTWORK CONNECTIONS
(50ZH060 ONLY)
The 50ZH060 units are shipped with flanges which nlust be
field-installed on the unit.
To install unit fhmges:

[
</
[95
!
II
CON;)
¢0 N\
_/94 0 _4080
[ ,_] 16 06]
\\
°1o
REQUIRED CLEARANCE TO COMBUSTIBLE MATE INCHES [rnm]
TOP QF UNIT ......................................................................................... 0
DUCT SIDE QF UNIT ............................................................................. 0
SIDE OPPOSITE DUCTS ...................................................................... 0
BOTTOM OF UNIT ................................................................................. 0
NEC. REQUIRED CLEARANCES. INCHES [mini
BETWEEN UNITS, POWER ENTRY SIDE .................................... 42.00 [1666.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.01
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE ......................... 42.00 [1066.8]
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
INCHES [mm]
CONDENSER COIL ACCESS SIDE .............................................. 36.06 [762.01
POWER ENTRY SIDE .................................................................... 36.08 [762.0]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TQP ....................................................................................... 48.0011219.21
SIDE OPPOSITE DUCTS .............................................................. 36.00 1762.0]
LEGEND
NEC National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge, with the exception of the condenser coil (36.00 in [914.0 mini. A
removable fence or barricade requires no clearance.
2. Dimensions are in inches. Dimensions in [ ] are in millimeters.
BI OWER, CONTROl BOX AND EVAP COli
ACC{SS PANEL
COMPRESSOR PANEL \
\\\\\\
FIELD ENTRY TO\
SERVICE PORTS _\
\\\
UNIT
50ZH030
LEFT SIDE VIEW FRONT VIEW 26.772
[10540] '°6 k ; L6,.,,2.,o,[I 20] _1]
I.D. x 12.7 DEEP RIGHT SIDE VIEW C00156
ELECTRICAL CHARACTERISTICS
208/230-3-60
UNIT WEIGHT
Ib kg
254 116
CENTER OF GRAVITY IN. (MM)
X Y Z
14.0 (358) 18.0 (483) 12.0 (305)
Fig. 2--Unit Base Dimensions--5OZH030

....... ?940 ...........................4080 ..............
J 57} [16 06]
j o
! x; lii{° )i°
t?'6 tj )/,
REAR VIEW _ o
DiC 1 3PE_ _gs
REQUIRED CLEARANCE TO COMBUSTIBLE MATL INCHES [mm]
TOP OF UNIT ......................................................................................... 0
DUCT SIDE OF UNIT ............................................................................. 0
SIDE OPPOSITE DUCTS ...................................................................... 0
BOTTOM OF UNIT ................................................................................. 0
NEC. REQUIRED CLEARANCES. INCHES mm
BETWEEN UN TS, POWER ENTRY S DE .................................... 42.00 066.8
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.01
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE ......................... 42.00 [1066.81
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
INCHES [mm]
CONDENSER COIL ACCESS SIDE .............................................. 30.00 [762.0]
POWER ENTRY SIDE .................................................................... 30.00 [762.0]
(EXCEPT FOR NEC REOUIREMENTS)
UNIT TOP ....................................................................................... 48.00 [1219.2]
SIDE OPPOSITE DUCTS .............................................................. 30.00 [762.0]
LEGEND
NEC - National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge, with the exception of the condenser coil (36.00 in [914.0 mm]. A
removable fence or barricade requires no clearance.
2. Dimensions are in inches. Dimensions in [ ] are in millimeters.
CONDENSER ,
cC
12950
{5098]
5o_iot,! O[ UNil
V'-P()_"A IOR \ \!l t
Ii
8i2
[iI (),A:[R, /q ' q _Os
COMPRESSOR PANEL \
[I.20]
LEFT SIDE VIEW FRONTVIEW [,0_o] RIGHT SIDE VIEW
[250]
C00003
UNIT
50ZH036
50ZH042
50ZH048
ELECTRICAL CHARACTERISTICS UNIT WEIGHT
Lb Kg X Y
208/230-3-80,
480-3-80 277 128 14.0 (388) 19.0 (483)
208/230-3-80,
480-3-80 295 134 14.0 (388) 19.0 (483)
208/230-3-80, 328 149 14.0 (388) 19.0 (483)
480-3-80
Fig. 3--Unit Base Dimensions--50ZH036-048
CENTER OF GRAVITY IN. (MM) Z
15.0 (381)
15.0 (381)
15.0 (381)

1176
[465]
3525
88]
3.5
44]
f
COND,
COIL_
I
\\\ -
DIMENSIONS IN [] ARE IN INCHES
_3528 [1389]
_35217[IBIB9]
_537 [211]
O n
REAR VIEW
12950
[50198]
BOTTOM OF UNIT
EVAP. "II" t
//
706
[27
L
889 J
[350]
LEFT SIDE VIEW
UNIT
50ZH06O
80]
REQUIRED CLEARANCETO COMBUSTIBLE MATL. INCHES [mini
TOP OF UNIT ......................................................................................... 0
DUCT SIDE OF UNIT ............................................................................. 0
SIDE OPPOSITE DUCTS ...................................................................... 0
BOTTOM OF UNIT ................................................................................. 0
NEC. REQUIRED CLEARANCES. INCHES [mmI
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]
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
INCHES [mr:l]
CONDENSER COIL ACCESS SIDE .............................................. 30.00 [762.0]
POWER ENTRY SIDE .................................................................... 30.00 [762.0]
(EXCEPT FOR NEC REQUIREMENTS[
UNIT TOP ....................................................................................... 48.00 [1219.21
SIDE OPPOSITE DUCTS .............................................................. 30.00 [762.0]
LEGEND
NEC National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge, with the exception of the condenser coil (36.00 in [914.0 mini. A
removable fence or barricade requires no clearance.
2. Dimensions are in inches. Dimensions in [ ] are in millimeters.
81215
[31199]
BOTTOM OF UNIT
CONTROL BOX AND EVAP C01L
ACCESS PANEL
690
[272]
COMPRESSOR PANELFIELD NTRYTO
o
iioooo-
0
FRONT VIEW 2o772
[I 0540]
UNIT WEIGHT
Lb Kg
368 187
_5490 [2161]
Fig. 4--Unit Base Dimensions--50ZH060
ELECTRICAL CHARACTERISTICS
208/230-3-60, 460-3-60
CENTER OF GRAVITY IN. (MM)
XYZ
14.0 (356) 20.0 (508) 18.0 (406)
\/
I.D. RIGHT SIDE VIEW C00158

1. Five pieces of flange are shipped on tile return-air opening of
the unit. Remove the flanges from the shipping position (See
Fig. 5). Screws are field-supplied.
2. One piece of llange is used as it is shipped (straight). Bend the
other 4 pieces at right angles.
3. Install the straight flange on tile right side of tile return-air
opening in holes provided. (See Fig. 6). Flanges should stick
out li"om unit to allow l_)r connection of ductwork.
4. Install 2 hand-lbrmed flanges onto mtum air opening in holes
provided to lbrm a rectangle around the remm air opening.
5. Install remaining 2 hand-lbmled flanges around discharge air
opening in holes provided.
6. Duetwork can now be attached to flanges.
When designing and installing ductwork, consider the lollowing:
When connecting ductwork to units, do not drill deeper than
3/4 inch in shaded area shown in Fig. 7 or coil may be
damaged.
All units should have field-supplied filters installed in the
return-air side of the unit. Recommended sizes lbr filters are
shown in Table 1.
Avoid abrupt duct size increases and reductions. Abrupt change
in duct size adversely al'li:cts air perlbmmnce.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal. When electric heat is
installed, use lire proof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must ectend 24 in.
li"om the unit discharge connection flange into the ductwork.
Size ductwork lbr cooling air quantity (cfln). The minimum air
quantity lbr proper electric heater operation is listed in Table 2.
Heater lindt switches may trip at air quantities below those
recommended.
Insulate and weatherproof all external ductwork. Insulate and
cover with a vapor barrier all ductwork passing through
conditioned spaces. Follow latest Sheet Metal and Air Condi-
tioning Contractors National Association (SMACNA) and Air
Conditioning Contractors Association (ACCA) mininmm in-
stallation standards lbr residential heating and air conditioning
systems.
Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or ronf according to
good construction practices.
Fig. 8 shows a typical duct system with 5(tZH unit installed.
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE
t • =
Belbre perlorming service or maintenance operations on
system, turn off main power to unit and install lockout tag.
Turn off accessory heater power switch if applicable. Elec-
trical shock can cause serious injury or death.
Units are dedicated side supply products. They are not convertible
to verlical air supply. A field-supplied plenum nmst be used to
convert to vertical air discharge.
Step 6--Provide for Condensate Disposal
NOTE: Be sure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
FIVE PIECES OF DUCT
FLANGE ATTACHED
HERE FOR SHIPMENT
COOOO5
Fig. 5--Shipping Location of Duct Flanges
(Size 060 Only)
HAND FORM
STRAIGHT PIECE C00006
Fig. 6--Flanges Installed on 50ZH060 Units
Unit removes condensate through a 1 3/64-in. 1D hole (using
314-in. OD piping or tubing) which is located at the end of the unit.
See Fig. 2-4 lbr location of condensate connection.
Condensate water can be drained directly onto the roof in rool_op
installations (where permitted) or onto a gravel apron in ground-
level 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 li"om overflowing. 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 using a 314-in. OD robing or pipe.
(See Fig. 9 and lit.) Make sure that the outlet of the trap is at least
1 in. lower than the unit drain-pan condensate connection to
prevent the pan li"om overflowing. Prime the trap with water.
Connect a drain tube using a minimum of 314-in. PVC, 314-in.

C00007
Fig. 7--Area Not to Be DriJJed More Than 3/4-in.
CPVC, or 3/4-in. copper pipe (all field supplied). Do not undersize
tile tube. Pitch the drain tube downward at a slope of at least 1 in.
lk)r every I0 ft of horizontal run. Be sure to check tile drain tube
liar leaks. Prime trap at the beginning of the cooling season
start-up. Allowable glues lot condensate trap connection are:
Standard ABS, CPVC, or PVC cement.
Step 7--1nstMI Electrical Connections
The unit cabinet nmst have an nninterrupted, 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 in
the control compartnlent, or conduit approved lot electrical
ground when installed in accordance with NEC (National
Electrical Code), ANSI (American National Standards
lnstitute)/NFPA (latest edition) (in Canada, Canadian Elec-
trical Code CSA C22.1 ) and local electrical codes. Failure to
adhere to this warning could result in serious injury or death.
Failure to lk_llow these precautions could result in damage to
the unit 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 connec-
tions nmst be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Relier to unit wiring diagram.
2. Use only copper conductor lbr 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. Insulate low-voltage wires fol7highest voltage contained
within conduit when low-voltage control wires are run in
same conduit as high-voltage wires.
5. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduiL etc. On all
3-phase units, ensure phases are balanced within 2 percent.
Consult local power company %r correction of improper
voltage and/or phase imbalance.
HIGH-VOLTAGE CONNECTIONS
The unit nmst have a separate electrical service with a field-
supplied, waterproof disconnect switch mounted at, or within sight
fl'om tile unit. Reler to the unit rating plate lk)r maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) lot
wire sizing. See Table 3 lot electrical data.
The field-supplied disconnect may be monnted on the unit over the
high-voltage inlet hole. See Fig. 2-4.
|
Operalion of nnit on inlproper lilac voltage constilnles abuse |
and may cause unit danlage lhal could allecl warranly. J
ROUTING POWER LEADS INTO UNIT
Use only copper wire between disconnect and unit. Tile high-
voltage leads should be in a conduit until they enter the unit;
conduit termination at the unit must be watertight. Run the
high-voltage leads through tile hole on the control box side of the
unit (see Fig. 11 lbr location). When the leads are inside the uniL
run leads to the control box (Fig. 121. On 3-phase units, connect
the leads to the black, yellow, and blue wires (see Fig. 13).
CONNECTING GROUND LEAD TO UNIT GROUND
Relier to Fig. 12 and 13. Connect the ground lead to the chassis
using tile nnit ground lug in tile control box.
ROUTING CONTROL POWER WIRES
Form a drip-loop with the thermostat leads belk_re routing them
into the unit. Route the thertnostat leads through grommeted hole
provided in 1.naitinto unit control box (See Fig. 11). Connect
therntostat leads and unit power leads as shown in Fig. 13 & 14.
Route thermostat wires through grommet providing a drip-loop at
the paneh Connect low-voltage leads to the thermostat as shown in
Fig. 14.
The unit translomler supplies 24-v power %r complete system
including accessory electrical heater. Trans%rnler is factory wired
%r 2311-voperation. If supply voltage is 208 v, rewire translimner
primary as described in the Special Procedures %r 2118-vOpera-
]ion section below.
ACCESSORY ELECTRIC HEAT WIRING
Relier to accessory electric heat installation instructions lot inlk_r-
marion on installing accessory electric heat. Accessory electric
heat wiring is shown in Fig. 15 - 17.
SPECIAL PROCEDURES FOR 2118-V OPERATION
Make sure that the power supply to the unit is switched OFF
and install lockout tag belk_re making any wiring changes.
Electrical shock can cause serious injury or death.
1. Remove wire nut from connection of ORG wire to BLK wire.
Disconnect the ORG translormer-primary lead from the BLK
wire. Save wire nut. See unit wiring label.
2. Remove tile wire nut from tile temdnal on tile end of the RED
translbrnlel'-prinlal T lead.
3. Save tile wire nut.
4. Connect the RED lead to the BLK wire l?'om which the ORG
lead was disconnected. Insulate with wire nut fi'onl Step 1.
5. Using the wire nut renloved l?'onl the RED lead, insulate the
loose tertninal on the ORG lead.
6. Wrap the wire nuts with electrical tape so that the metal
temdnals cannot be seen.
Indoor blower-motor speeds may need to be changed %r 2118-v
operation. Reler to Indoor Airflow and Airflow Adjustments
section. (See Table of Contents lor page number.)

UNiT 50ZH 048 060
OPERATING WEIGHT (Ibs) 328 368
COMPRESSOR TYPE
REFRIGERANT Charge (Ib)
REFRIGERANT METERING DEVICE
OUTDOOR COiL
Rows...Fins/in.
Face Area (sq ft)
OUTDOOR-FAN MOTOR CFM
Nominal Rpm
Motor Hp
Diameter (in.)
INDOOR COiL
Rows...Fins/in.
Face Area (sq ft)
iNDOOR FAN MOTOR
Blower Motor Size (in.)
Nominal Cfm
Rpm Range
Number of Speeds
Factory Speed Setting
Motor Hp
CONNECTING DUCT SIZES
Supply Air (in.)
Return Air (in.)
FIELD-SUPPLIED RETURN-AIR FILTERt
Throwaway (in.)
* 460-v motors are 2-speed or 3-speed.
Table 1 -- Physical Data
030 036 042
254 277 295
Scroll
R-22
5.8 I6.9 i6.6 ]
Acutrol TM System
Copper Tubes, Aluminum Plate
2...17 1...17 2...17
6.7 11.1 9.3
Propeller
2000 2600 2600
1100 1100 1100
1/4 1/4 1/4
20 20 20
Copper Tubes, Aluminum Plate
3...18 3...15 3...18
3.1 4.0 4.0
Direct Drive
10x8 10x9 10x9
1000 1200 1400
550-1000 800-1050 800-1050
333
Med Low Med
1/4 1/2 1/2
Round
14
14
I I
9.1 [ 9.7
Fins
2...17 2...17
11.1 12.7
26OO
1100
1/4
2O
Fins
4...15
4.4
10 x 9
1600
1000-1100
2
Low
3_
320O
1100
1/2
2O
4...15
4.9
10 x 10
2000
950-1100
3
Low
1
Square
13.9 x 13.9
13.9 x 27.8
tRequired filter sizes shown are based on the ARI (Air Conditioning and Refrigeration Institute) rated airflow at a velocity of 300 ft/min for throwaway type or 450 ft/min
for high capacity type. Recommended filters are 1-in. thick.
l 24 x 30 24 x 30

PRE-START-UP
Failure to observe the lollowing warnings could result in
serious inju Uor death:
1. Follow recognized salk:ty practices and wear protective
goggles when checking or servicing reb'igerant system.
2. Do not operate compressor or provide any electric power to
unit unless compressor terndnal cover is in place and
secured.
3. Do not remove compressor terminal cover tmtil all electri-
cal sources arc disconnected and lockout tag is installed.
4. Relieve all pressure fl'om both high- and low-pressure sides
of the system belk_retouching or disturbing anything inside
temfiual box if refrigerant leak is suspected around con>
pressor terminals. Use accepted methods to recover refrig-
erant.
5. Never attempt to repair soldered connection while refrig-
erant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and rel]'igerant under pressure. To remove a
component, wear protective goggles and proceed as lol-
lows:
a. Shut olT electrical power to unit and install lockout tag.
b. Relieve all refrigerant from system using both high- and
low-pressure ports. Use accepted methods to recover
refrigerant.
c. Cut component connecting tubing with tubing cutter and
remove component fi'om unit.
d. Carefully unsweat renmiuing tubing stubs when neces-
sary. Oil can ignite when exposed to torch flame.
Use the Start-Up Checklist supplied at the end of this book and
proceed as IkHlows to inspect and prepare the unit Ik_r initial
start-up:
1. Remove all access panels.
2. Read and I]Hlow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels anached to, or
shipped with, unit.
Make the R_llowing inspections:
a. Inspect I_r shipping and handling damages such as broken
lines, loose parts, disconnected wires, etc.
b. Inspect lor oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak. Leak-test all refiigerant tubing connections using
electronic leak detector, or liquid-soap solution. If a refrig-
erant leak is detected, see I_Hlowing Check I_)rRefiigerant
Leaks section.
c. Inspect all field- and factory-wiring connections. Be sure
that connections are completed and tight. Ensure wires do
not contact rel_'igerant robing or sheet metal edges.
d. Inspect coil fins. If damaged during shipping and handling,
carelidly straighten fins with a fin comb.
3. Verify the lollowing conditions:
a. Make sure that outdoor-fan blade is correctly positioned in
fan orifice. Top edge of blade should be 3.125 in. down
l]'om outdoor coil outlet grille (size 030 048, See Fig. 23)
or hub should be 0.70g-in. away l_'om motor end bell (size
061L See Fig. 24). See Outdoor Fan Adjustment section.
b. Make sure that air filter is in place.
c. Make sure that condensate drain trap is filled with water to
ensure proper drainage.
IPower Wiring
-- Control Wiring
_ Condenser Airflow *Sepa ate disconnect per NEC
E_ (National Electrrca_Code required
_ eec _c hea erwhen s nge
Evaporato_Arrf_ow point c_nectionrsnot used¸ C0000t_
C00008
Table 2--Minimum Airflow for Safe Electric Heater
Operation (CFM)
SIZE
030 036 042 048 060
750 900 1050 1200 1500
Fig. 8--Typical installation
1" (25ram)MIN. TRAP
OUTLET _
2" (50mm) MIN
C99013
Fig. 9--Condensate Trap (Using Tubing)
1" min. <TRAP
OUTLET
2" min.
C00009
Fig. lO-PVC Condensate Trap
d. Make sure that all tools and miscellaneous loose parts have
been renloved.
START-UP
Use the Start-Up Checklist supplied at the end of this book and
proceed as lk_llows:
Step 1--Check for Refrigerant Leaks
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS:
1. Using both high- and low-pressure ports, locale leaks and
reclaim renmining refrigerant to relieve system pressure.
2. Repair leak lk)llowing accepted practices.
NOTE: Install a liquid-line l]lter drier whenever the system has
been opened lk)r repair.

HIGH-VOLTAGE LOW-VOLTAGE
POWERWIRING WIRING ENTRY
ENTRY HOLE HOLE
Fig. 11--Unit Electrical Connection
COMPRESSOR
CONTACTOR
\
C00010
TRANSFORMER
0 o
0
o0 (3,
ELECTRIC GROUND INDOOR OUTDOOR FAN MOTOR HIGH
HEATER LUG FAN AND COMPRESSOR VOLTAGE
FUSES RELAY START CAPACITOR LEADS
C00011
Fig. 12--Control Box Wiring
Step 2iStart-Up Cooling Section and Make Adjustments
W,W
Complete the required procedures given in the Pre-Start- Up
section this page belore starting the unit. Do not jumper any
sali:ty devices when operating the unit.
Do not operate the compressor in cooling mode when the
outdoor temperature is below 40 F.
Do not rapid-cycle the compressor. Allow 5 minntes between
"on" cycles to prevent compressor damage.
CHECKING COOLING CONTROL OPERATION
Start and check the unit (or proper cooling control operation as
follows:
10
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 within 30 seecnnds 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, outdoor fan, and indoor blower
motors start and that reversing valve shifts. Observe that
cooling cycle shuts down when control setting is satisfied.
Reversing valve (RV) remains energized.
3. Place system switch in HEAT position. Observe that compres-
sor, indoor fan and outdoor fan energize (Reversing Valve is
deenergized in heat pump heating mode). Set control above
room temperature. Observe that heating cycle shuts down
when control setting is satisfied.
4. When using an automatic changeover room thermostat, place
both SYSTEM and FAN switches in AUTO. positions.
Observe that unit operates in Cooling mode when temperature
control is set to "call li)r cooling" (below room temperature),
and unit operates in Heating mode when temperature control
is set to "call lot heating" (above room temperature).
COMPRESSOR ROTATION
On all 3 Phase units it is important to be ceriain compressor is
rotating in the proper direction. To determine whether or not
compressor is rotating in the proper direction:
1. Connect service ganges to suction and discharge pressure
fittings.
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. Turn off power to the unit and tag disconnect.
2. Reverse any two of the unit power leads.
3. Turn on power to the unit.
The suction and discharge pressure levels should now move to
their normal start-up levels.
NOTF:: When the compressor is rotation in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
Step a--Refrigerant Charge
Rel]'igerant Charge Amount of rel_'igerant charge is listed on
unit nameplate and in Table 1. Re{i:r to Carrier Rel?'igerant Service
Techniques Manual, Re{?'igerants section. Unit panels lnust be in
place when unit is operating during charging procedure. Unit nmst
operate a minimum of 15 minutes belk_rechecking charge.
NO CHARGE
Re{i:r to Can'ier Refrigerant Service Techniques. Use standard
evacuating techniques. Alter evacuating system, weigh in the
specified amount of re{5"igerant (re{i:r to Table 1).
LOW CHARGE COOLING
Using cooling charging chart (see Fig. 18 22),Vary rel?'igerant
until conditions of the chart are met. Note that charging chart is
difli:rent {?'omthose normally used. Charts are based on charging
the units to the correct superheat {k)r the various operating
conditions. An accurate pressure gauge and temperature-sensing
device is required. Connect the pressure gauge to the service port
on the suction line. Connect temperature sensing device to the
suction line near the colnpressnr and insulate it so that outdoor
ambient temperature does not al_i_ctreading.

GROUND
r LEAD
/SINGLE'PHASE I_- =--
3-PHASE /CONNECTIONS 4-
CONNECTIONS 1TO DISCONNECTI .
TO DISCONNECT1PER NEC L_ - - -
PER NEC | L
L
UNIT GROUND
_ Z__ BLK- -/
z__ YEL- -/
- z_- BLU- -/
Fig. 13--Line Power Connections C00012
©
®
®
®
THERMOSTAT
AND SUBBASE
L..__
[_
L_.__.
_BRN--
-_ ORN --
_RED --
"_ GRN --
UNIT CONTROL POWER
SPLICE BOX
Fig. 14--Control Connections C99056
TO USE THE COOLING CHARGING CHART
This metllod is to be used in cooling mode only. Take tile outdoor
ambient temperature and read the suction pressure gauge. Reli:r to
charts to determine what the suction temperature should be. If
suction temperature is high, add rcl_'igerant. If suction temperature
is low, carefldly recover some of the charge. Recheck the suction
pressure as charge is adjusted.
Example: (See Fig. 18)
Outdoor Temperature 85°F
Suction Pressure--74 psig
Suction Temperature should be--60°F
Note--Suction Temperature may vary +/- 5°F.
HEATING MODE CHARGE
Do not attempt to adjust charge by cooling methods while in heat
pump heating mode. Recover refrigerant and weigh in according to
unit data plate relhigerant data.
Step 4--Indoor Airflow and Airflow Adjustments
NOTE: For cooling operation, the recommended airflow is 350 to
450 cfln per each 12,000 Bmh of rated cooling capacity.
Table 4 shows dry coil air delivery liar horizontal discharge units.
Tables 5-7 show pressure drops.
NOTE: Be sure that all supply- and return-air grilles are open,
free fi'om obstructions, and adjusted properly.
Disconnecl elech'ical power to the unil and inslall lockonl lag
before changing blower speed. Electrical shock can cause
serious injury or dealh.
To change the speed of the indoor Ian motor (IFM), remove the fan
motor speed leg lead fi'om the indoor fan relay (IFR) with units
030, 042, 048 & 060 or the time delay relay (TDR) on 036 size and
replace with lead lor desired blower motor speed, lnsuh_te the
removed lead to al,oM col/act l_ith chassis parts.
FOR 460-V MOTORS
The motor leads are color coded as lbllows:
3-SPEED (060 ONLY) 2-SPEED
black = high speed black = to purple
yellow = line
orange = medium speed purple = to black
blue = low speed red = line
To change the speed of the indoor tim motor (1FM) from low speed
to high speed, remove the red lead from the indoor-fan relay (IFR).
ON 2 Speed Motors: Insulate the red lead to avoid contact with
any chassis parts. Separate the black lead fi'om the purple lead.
Connect the black lead to the IFR. Insulate the purple lead to avoid
contact with any chassis parts. ON 3-Speed Motors: remove the
fan motor speed leg lead freln the indoor (indoor) fan relay (1FR)
and replace with lead liar desired blower motor speed.
Step 5--Unit Controls
All compressors have die Ibllowing internal-protection controls.
HIGH-PRESSURE RELIEF VALVE
This valve opens when the pressure differential between the low
and high side becomes excessive.
Airflow can be changed by changing the lead connections of the
blower motor.
Units 50ZH 036, 048, and 060 blower motors are factory wired li)r
low speed operation. Units 50ZH030 and 042 are factory wired li)r
medium speed operation.
LOSS OF CHARGE SWITCH
Located on the outdoor liquid line is a low-pressure switch which
functions as a loss-of-charge switch. This switch contains a
Schrader core depressor. This switch opens at 7 psig and closes at
22 psig. No adjusm_ent is necessary.
FOR 208/230-V
The motor leads are color-coded as lk_llows:
3-SPEED 2-SPEED
black = high speed black = high speed
blue = medium speed
red = low speed red = low speed
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when either the
current or internal temperature become excessive, and automati-
cally resets when the internal temperature drops to a sale level.
This overload may require up to 60 minutes (or longer) to reset;
therelore, if the internal overload is suspected of being open,
disconnect the electrical power to the unit and check the circuit
througla the overload with an ohnnneter or continuity tester.
II

(SEE NOTE#2]
NOTES
LOAD SIDE TRAM
XcB o
YEL DFT
PNK LPS
RN = ORN 'BLU_BLU _ZJ _
WHTI RED RED SEE ACCESSORY HEATER LABEL
II_.... _ BRN_<__ BRN_ W-HT _
BRN _ i i
24V _PxL ICE
COMPRESSOR BELAY
2,SEE PRICE PAGES FOR THERMOSTAT (TI,T2)
AND SUBBASE PART NUMBERS. C10 15 SEC cT1 T+6 MIN,
3.SET HEAT ANTICIPATOR AT .B
4,USE 75_C COPPER CONDUCTORS ONLY, CLOSES OPENS
[TSTAT)
BRN_EL_E_ COMPONENT ARRANGEMENT
INDOOR FAN
_I_ 41_I='Iml ' _ _LE_BLK_GRN ...........YE ELjIGNDBLL_..........
...........I
ACcON_sE_TIONoNB_yX I( 'CMAPC2Ap iFCMAPIA p
DISCONNECTIIT_ 24V POWER ENTRY _ _ _
__IL_I LCJ L_
FAN BEOUENCE
TDR
oT T+BO
ENERG]ZED OE ENERGIZED
DEFROST CYCLE
OFT
OF%OF
L o T T=30 T+IO M[N
LAST DEFROST T=50 MAXIMUM
CYCLE T=90
LEGEND
FIELD SPLICE C CONTACTOR,COMPRESSOR
CAP CAPACITOR
MARKED WIRE CB CIRCUIT BREAKER
TERMINAL (MARKEO) COMP COMPRESSOR MOTOR
CTB COMPRESSOR T[ME BELAY
0 TERMINAL (UNMARKED) EQUIP EQUIPMENT
E_ TERMINAL BLOCK FU FUSE
GNB GROUND
@ SPLICE DB DEFROST BOARD
(_@ SPLICE (MARKED) OFT DEFROST THERMOSTAT
OR OEFROST RELAY
PLU@ IFR INDOOR FAN RELAY
RECEPTACLE IFM INDOOR FAN MOTOR
LPS LOW PRESSURE SWITCH
-- FACTORY WIRING OFM OUTOOOR FAN MOTOR
I I F[ELD CONTROL WIRING PL PLUO
RVS REVERSING VALVE SOLENOID
I FIELD POWER WIRING SB SLOW BLOW FUSE
TDR TIME OELAY RELAY
Ill ACCESSORY OR OPTIONAL WIRING TRAN TRANSFORMER
TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
Fig. 15--208/230-3-60 Wiring Diagram
12
A06055

SCHEMATIC
- _ 480 3 80 OFR --
......... IELD _ ....... _C_ .... r ......
p BLK _ C CAP2
I_LT_YEL_r'__'¥ELI------7_YEL_ YEL_BRN_
LSU____I_._BLu_il--------_E'L| OT_
yOLU_ i /I ..... __
USED WITH _ BLU COMP
C.... r BLK:41 I I I YEL '
5,10,15 _ 20 KW _ YEL i BLU
SIZE 2 AW8 _BLU i RED
L, .............._-----fl--OLU--_--RED =_IO=_
SEE ELECTRIC _ _ i BLK_)IF _............. i YEL _ IFM
.... ......
_ |....... _EL J-._
IBLK'
,
.................... _ .,,I-- ...... --_
LOAD SIDE _ CB _
FRED--CX: ........
I
I
I
24V 8SOPXLICE
THERMOSTAT SUB BASE
FAN _°N ,
H_ _
(SEE NOTE_2)
m -
_ _ _ _ _ _ _ _ _ _BRN_
2SEE PRICE PAGES FORTHERMOSTAT
AND SUBBASEPART NUMBERS.
3SET HEAT ANTICIPATOR AT .8
4USE 75"C COPPER CONDUCTORSONLY.
COMPRESSOR DELAY
OTO_(TI,T2)
0 .5 SEC T T+5 MIN.
ol #_
CLOSES 0 NS
ITSTAT)
FAN SEQUENCE
TDR(1,3)
0 T T+BO
...._........ gR.....
BRNYELBLK_ COMPONENT ARRANGEMENT
DI_SCONNECT/_ ............. _ r_l r_l
PER NEC --
%TRAM
SPLICE
DEFROST CYCLE
OFT
OFI,OF_
L o T T=30 T+IO MIN
LAST DEFROST T=50 MAXIMUM
CYCLE T=90
LEGEND
FIELD SPLICE C CONTACTOR, COMPRESSOR
CAP CAPAC[TOR
MARKED WIRE CB C[RCU[T BREAKER
TERMINAL (MARKED) COMP COMPRESSOR MOTOR
CTD COMPRESSOR TIME DELAY
0 TERMINAL (UNMARKED) EQUIP EQU[PMENT
TERMINAL BLOCK GNO GROUND
DB DEFROST BOARD
@SPL]CE OFT DEFROST THERMOSTAT
(_o SPLICE (MARKED) DR DEFROST RELAY
PLUG IFM INDOOR FAN MOTOR
LPS LOW PRESSURE SWITCH
RECEPTACLE OFM OUTDOOR FAN MOTOR
-- FACTORY W[RIN8 OFR OUTDOOR FAN RELAY
PL PLUG
-- -- F]ELD CONTROL WIRIN8 QT QUADRUPLE TERMINAL
F]ELD POWER WIRING RVS REVERSING VALVE SOLENOID
TRAM TRANSFORMER
_m_ ACCESSORY OR OPTIONAL WIRING
TO ]NOICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
Fig. 16--460-3-60 Wiring Diagram
13
A06056

C _ = BRN(COMMON=)
Wl_ - -VLO-[S-TE-P-2L
w1_,i = VV_T_SZEPJ ).....
To
UNIT POWER
WIRING
FUSEBLOCK -
L24Z -, IYE'
t -, olBLK"
Step 6--Sequence of Operation
m qI
I
i CONTACTOR2
CONTACTOR1
YELl_ m _IYEL
F °!
1
AYTO-LIMIT BLK
C00014
Fig. 17--Accessory Electric Heater Wiring
FAN OPERATION
The FAN switch on the thermostat controls indoor fan operation.
When the FAN switch is placed in the ON position, the IFR
(indoor-fan relay) is energized through the G terminal on the
thermostat. The normally-open contacts close, which then provide
power to the indoor (evaporator) fan motor (IFM). The 1FM will
run continuously when the FAN switch is set to ON.
When the FAN switch is set to AUTO, the thermostat deenergizes
the IFR (provided them is not a call li)r cooling). The contacts ()pen
and the ]FM is deenergized. The 1FM will be energized only when
them is a call lot cooling, in heat pump heating mode or if the unit
is equipped with accessory electric heat, the indoor-fan motor will
also run while the accessory electric heat is energized.
NOTE: Some units are equipped with a time-delay relay. On
these units, the indoor lhn renmins on li)r 30 seconds alter G or Y
is deenergized.
COOLING
With the thermostat subbase in the cooling position, the thermostat
makes circuit R-O. This energizes the reversing valve solenoid
(RVS) and places the unit in standby condition R(r cooling.
NOTE: The defrost control board has a 5 minute compressor
anti-short cycle time delay built in between compressor starts.
On a call lor cooling, tile compressor contactor (C) and the IFR are
energized through the Y and G terminals of the thermostat.
Energizing the compressor contactor supplies power to the com-
pressor and the outdoor (condenser) fan motor (OFM). Energizing
the 1FR provides power to the IFM.
When the need fi)r cooling has been satisfied, the OFM, compres-
sor, and IFM (FAN on AUTO) are deenergized. If the unit is
equipped with a 30-second delay (036 size only), the indoor fan
will renmin energized li)r 30 seconds alter the compressor is
deenergized. The reversing valve solenoid renmins energized.
HEAT PUMP HEATING
On a call for heat, thernmsmt makes circuits R-Y and R-G. When
compressor time delay (5-minute _+2 minutes) is completed, a
circuit is made to C, starting COMP and OFM. Circuit R-G also
energizes 1FR and starts IFM after l-second delay.
Should room temperature continue to fall, circuit R-W is nmde
through second-stage thermostat bulb. If optional electric heat
package is used, a relay is energized, bringing on first bank of
supplemental electric heat. When thermostat is satisfied, contacts
open, deenergizing contactor and relay; motors and heaters deen-
ergize. The 1FM may be controlled by atin(e-delay relay that keeps
the fan on fl)r 30 seconds.
DEFROST
Deli'ost board (DB) is a time and temperature comrol, which
includes a field-selectable time period between checks fl)r deli'ost
(30, 50 and 90 ndnutes). The time period is li_ctory-set at 30
minutes and should only be adjusted by a trained service person.
Electronic timer and delh)st cycle start only when contactor is
energized and defi'ost thermostat (DFT) is closed.
Deli'ost mode is identical to Cooling (((ode. The outdoor fan motor
stops because of "OFI" and "OF2" contacts opening on the defrost
board, a bank of optional electric heat turns on to warm air
supplying the conditioned space.
ELECTRIC RESISTANCE HEATING
If accessory electric heaters are installed, on a call fl)r "Emergency
Heat" the thermostat energizes W which energises the heater mlay
and in turn energizes the electric healers. The IFR is energized
which starts the indoor-fan motor. If the heaters are staged, W2 is
energized when the second stage of heating is required. When the
need fl)r heating is satislied, the heater and IFM are deenergized.
MAINTENANCE
To ensure continuing high perR(rnmnce, and to reduce the possi-
bility of premature equipment failure, periodic nmintenance nmst
be perli.)rmed on this equipment. This cooling unit should be
inspected at least once each year by a qualil]ed service person. To
troubleshoot cooling of units, reler to Troubleshooting chart in
back of book.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
14

Table 3--Electrical Data--50ZH
UNiT 50ZR
SIZE
(-SERIES, IF
USED)
O3O
036
042
048
060
VOLTAGE
RANGE OFM IFM
V-PH-HZ
208/230-3-8
208/230-3-80
480-3-60
208/230-3-80
460-3-80
208/230-3-80
460-3-80
208/230-3-80
480-3-80
MIN
187
187
414
187
414
187
414
187
414
(See legend following Electrical Data charts)
COMPRESSOR
FLA
LRA FLA
ELECTRIC HEAT
Nominal KW* FLA
-/-
10.4/12.0
20.8/24.1
31.3/36.1
-/-
10.4/12.0
20.8/24.1
31.3/36.1
6.0
12.0
18.0
-/-
10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9
6.0
12.0
18.0
24.1
-/-
10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9
6.0
12.0
18.0
24.1
-/-
10.5/12.0
20.8/24.1
31.4/36.1
41.4/47.9
6.0
12.0
18 .0
23.9
SINGLE POINT POWER SUPPLY
MCA FUSEOR
CKT BKR
20
35/35
45/50
60/-
25/25
35/35
45/50
60/-
15
2O
25
35
30/30
35/40
50/50
15
2O
3O
35
45
25/25
35/40
50/60
15
2O
3O
35
45
35/35
45/45
60/60
2O
25
3O
4O
45
MAX RLA
254 10.0
254 11.4
508 5.7
254 13.9
508 6.8
254 12.8
508 6.4
254 15.9
508 8.0
-/-
3.8/5.0
63.0 1.5 5.8 7.5/10.0
11.3/15.0
-/-
3.8/5.0
77.0 1.5 2.8 7.5/10.0
11.3/15.0
5
39.0 0.8 1.5 10
15
-/-
3.8/5.0
88.0 1.5 2.8 7.5/10.0
11.3/15.0
15/20
5
44.0 0.8 1.5 10
15
2O
-/-
3.8/5.0
93.0 1.5 4.2 7.5/10.0
11.3/15.0
15/20
5
46.5 0.8 2.1 10
15
2O
-/-
3.8/5.0
124.0 3.1 6.2 7.5/10.0
11.3/15.0
14.9/19.9
5
59.6 1.5 3.2 10
15
19.9
16.8
29.9/31.8
42.8/46.9
56.1/61.9
18.6/18.6
31.7/33.6
44.6/48.7
57.8/63.7
9.9
16.9
24.4
31.9
21.7/21.7
34.8/36.7
47.7/51.8
60.9/66.8
73.4/81.6
10.8
18.3
25.8
33.3
40.9
21.7/21.70
34.8/36.7
47.7/51.8
61.0/66.8
73.7/81.8
10.9
18.4
25.9
33.4
41.0
29.2/29.2
42.3/44.2
55.2/59.3
68.4/74.3
81.2/89.3
14.7
22.2
29.7
37.2
44.6
MOCP
-/70
-/70
70/70
80/90
70/70
80/90
70/80
90/90
LE ENO CQUS
FLA -- Full Load Amps
LRA -- Locked Rotor Amps
MCA -- Minimum Circuit Amps
MOCP -- Maximum Overcurrent Protection
RLA -- Rated Load Amps
CKT BKR -- Circuit Breaker
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 volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage imbalance
= 100 x max voltage deviation from average voltage
average voltage
EXAMPLE: Supply voltage is 460-3-60.
A B C AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage = 452 + 464 + 455
3
_ 1371
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 452=5v
(B0) 464 457=7v
(AC) 457 455 =2v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x --
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
15

The ability to properly perlbrn_ maintenance on this equip-
ment requires certain expertise, mechanical skills, tools and
equipment. If you do not possess these, do not attempt to
perlbrn_ any maintenance on this equipment, other than those
procedures recommended in the User's Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SERI-
OtIS 1NJURY, DEATH OR DAMAGE TO THIS EQUIP-
MENT.
The minilnum maintenance requirements %r this equipment are as
lollows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, outdoor coil, drain pan, and condensate
drain each cooling and heating season lbr cleanliness. Clean
when necessary.
3. Inspect blower motor and wheel lot cleanliness each cooling
and heating season. Clean when necessary. For l]rst heating
season, inspect blower wheel bimonthly to determine proper
cleaning [?'equency.
4. Check electrical connections lbr tightness and controls lk_r
proper operation each cooling season. Service when neces-
sary.
5. Check the drain channel ilk the top cover periodically %r
blockage (leaves, insects). Clean as needed.
Failure to lollow these warnings could result in serious injury
or death:
1. Turn off electrical power to the unit and install lockout tag
beli_re perlorming 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
15"oresharp edges, etc.
3. Never place anything combustible either on, or ilkcontact
with, the unit.
Step 1--Air Filter
NOTE: Never operate the unit without a suitable air lilter ilkthe
return-air duct system. Always replace the l]lter with the same size
as originally installed. See Table 1 lor recommended filter sizes
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each cooling season or whenever the filters become clogged with
dust and lint.
Replace filters with the same dimensional size and type as
originally provided, when necessary.
Step 2--Unit Top Removal (Outdoor-Coil Side)
NOTE: When perli}rming maintenance or service procedures that
require removal of the unit top, be sure to per%rm all of the routine
maintenance procedures that require top removal, including coil
inspection and cleaning, and condensate drain pan inspection and
cleaning.
Disconnect and tag electrical power to the unit belk}re
removing top. Failure to adhere to this warning could cause
serious injury or death.
Only qualified service personnel should perlorm maintenance and
service procedures that require unit top removah
Reli:r to the lbllowing top removal procedures:
1. Remove 7 screws on unit top cover surface. (Save all screws.)
2. Remove 2 screws on unit top cover flange. (Save all screws.)
3. Lift top l?'om unit carefully. Set top on edge and make sum
that top is supported by unit side that is opposite duct (or
plennm) side.
4. Carefully replace and secure unit top to uniL using screws
removed ilk steps 1 and 2 above, when maintenance and/or
service procedures are completed.
Step 3--indoor Blower and Motor
For hmger lili:, operating economy, and continuing efficiency,
clean accunmlated dirt and grease l?'om the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit bel_re
cleaning the blower wheel. Faihn'e to adhere to this warning
could cause serious injury or death.
To clean the blower wheel:
1. Access the blower assembly as lollows:
a. Remove top access panel.
b. Remove 3 screws that hold blower orifice ring to blower
housing. Save screws.
c. Loosen setscrew(s) which secure wheel to motor shaft.
2. Remove and clean blower wheel as lollows:
m E:: ::ikt:i:Kt=Kt : 41
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LLI Q- ... = d=
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Z Z .... ,€
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_276 40 , '' ' l, ,I,,,I, 1, , "''_
207130 -:J, lllillllllll :::lllllllill 1
30 40 50 60 70 80 90
SUCT!ON L!NE TEM PERATURE (°F)
I I IIIII
-1 4 10 16 21 27 32
SUCTION LINE TEMPERATURE (°C)
Fig. 18--Cooling Charging Chart--5OZH030 c°°_63
16

40 50
SUCTION LINE TEMPERATURE
gi-
11-
40 50 60 70
SUCTION LINETEMPERATURE
30 90
-1 4 10 16 21 27 32
SUCTION LINE TEMPERATURE
0166
II IllIII ._
.683 100-_ _ _ _ _:"
- - UTDOORTEMP = ,-11,--
oF oc
46 -
_ _8 38 :
552 _80
CO IIII III1[
_70 55 13 --
483 __ _-J=N-H =
I_ll 11[1 | 1 Ell ]L
Io m+ :l:gA__
3451D50 __ _ _ __ _ _
CO _ I _ I III I III I
I111 I_[[I 1 Jl[ll l[[llJl[
I I I I 11 III I Ill I / I
207 30 IIIll Illlllll
IIII I II
30 40 50 60 70 80 90
164
SUCTION LINETEMPERATURE(°F)
I I IIIII
-1 4 10 16 21 27 32
o
SUCTION LINETEMPERATURE(C) C00165
Fig. 20--Cooling Charging Chart--50ZH042 Units
[[Ll.L_I II ..........................................£[ 1! °F °C II.
,1108
621 _'90- E _ 95 35
_ _ 88 _
483552_80-_70_- _-_-__!!i_ _ "'6521_7555 24H_1318""
z60. i
348>o-
................ ,q ,,,,,,
30.
30 40 50 60 70 80 90
SUCTION LINETEMPERATURE
-1 4 10 16 21 27 32
SUCTION LINE TEMPERATURE (°C)
C00167
Fig. 22--Cooling Charging Chart--50ZH060 un ts
a. Lift wheel from housing. When handling and/or cleaning
blower wheel, be sure not to disturb balance weights (clips)
on blower wheel vanes.
b. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations l]'om wheel
and housing with vacuum cleaner, using a soft brush
attachment. Remove grease and oil with a mild solvent.
c. Reassemble blower into housing. Place upper orifice ring
on blower to judge location of the blower wheel. Blower
wheel should be approximately 0.2-in. below bottom of
orifice ring when centered correctly. Be sure setscrews am
tightened on motor and are not on round part of shaft.
d. Set upper orifice ring in place with 3 screws removed in
step 1 above.
e. Replace top access paneh
Step 4--Outdoor Coil, Indoor Coil, and Condensate
Drain Pan
Inspect the outdoor coil, indoor coil, and condensate drain pall at
least once beating and cooling season. Proper inspection and
cleaning requircs the removal of the unit top. See Unit Top
Removal section abole.
Remove all obstructions (including weeds and shrubs) that inter-
Ibm with the airflow through the outdoor coil. Straighten bent fins
with a fin conlb. If coated with dirt or lint, clean the coils with a
vacuum cleaner, using a soft brush attachment. Be careful not to
bend the l]ns. 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 carclM not to splash water on motors,
17

Table 4--Dry Coil Air Delivery* Horizontal Discharge
(Deduct 10 percent for 208 Volt Operation)
Unit
030
036
042 t
048 t
080 t
Motor Speed
Low
Med
High
Low
Med
High
Low
Med
High
Low
Med
High
Low
Med
High
230 AND 460 VOLT
External Static Pressure (in. wg)
Watts/CFM 0,1 0.2 0.3 0,4 0.5 0.8 0.7 0.8
Watts 288 285 282 279 274 268 261
Cfm 875 820 802 734 668 582 478
Watts 390 383 378 369 360 350 340
Cfm 1131 1090 1038 978 917 830 721
Watts 528 520 510 495 480 460 450
Cfm 1891 1338 1285 1200 1115 1018 920
Watts 450 435 420 400 380 335 326 311
Cfm 1231 1218 1204 1120 1008 950 863 751
Watts 470 450 445 410 388 359 338 321
Cfm 1302 1264 1205 1163 1081 940 873 783
Watts 660 635 610 575 540 505 485 460
Cfm 1700 1660 1581 1450 1297 1190 1095 999
Watts 478 458 440 411 378 350 327 317
Cfm 1303 1270 1224 1179 1126 1022 911 816
Watts 481 468 450 438 404 370 338 320
Cfm 1310 1280 1241 1181 1110 1022 943 811
Watts 798 678 647 618 578 540 500
Cfm 1736 1688 1618 1510 1421 1309 1187
Watts 801 760 730 688 650 600
Cfm 1898 1841 1757 1682 1564 1429
Watts
Cfm
Watts 870 842 818 782 696 632
Cfm 2000 1903 1799 1718 1625 1446
Watts 890 850 810 790 735 680 580 480
Cfm 1834 1820 1791 1762 1703 1640 1415 1159
Watts 1040 1018 1000 950 890 835 790 650
Cfm 2230 2102 2025 1960 1901 1855 1752 1468
Watts 1073 1038 1001 958 898 840 800 691
Cfm 2230 2202 2160 2122 2052 1926 1791 1588
0.9
460
1060
570
1333
828
1385
422
950
58O
1121
575
1202
t 480-v motors are 2-speed.
Air delivery values are based on operating voltage of 230-v. or 460-v., dry coil, without filter or electric heater. Deduct wet coil filter, and electric heater pressure drops
to obtain external static pressure availabe for ducting.
Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below
this point.
Dashes indicate portions of the table that are beyond the blower motor capacity or are not recommended.
Table 5--Wet Coil Pressure Drop Table 6--Filter Pressure Drop (In. wg)
UNIT SIZE UNiT FILTER CFM
5OZH SiZE SIZE
50ZH (IN.) 500 600 700 800 900 1000 1100 1200
030 080-042 24x24 0.06 0.07 0.08 0.08 0.09 0.09 0.09 0.10
048, 060 24 x 30
038
042
048
060
AIRFLOW
(CFM)
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1800
2100
2300
PRESSURE DROP
(IN. WG)
0.08
0.08
0.08
0.07
0.09
0.11
0.12
0.04
0.08
0.08
0.09
0.07
0.08
0.09
0.07
0.08
0.09
0.10
18
1300 1400
0.11 0.12
0.08 0.09
UNiT FILTER CFM
SIZE SiZE
50ZH (IN.) 1500 1600 1700 1800 1900 2000 2100 2200 2300
030-042 24 x 24 0.14 0.15
048,060 24 x 30 0.10 0.11 0.12 0.13 0.14 0.15 0.18 0.17 0.18
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 1o clean between the coils. Be sure to
flush all dirt and debris from the unit base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing all
lk_reign matter from the pan. Flush the pan and drain tube with
clear water. Do not splash water on the insulation, motor, wiring,

Table 7--Accessory Electric Heat Pressure Drop
0n. wg)
ICFM
"E"E°"wI800I80011000112001140011600118001200012200
5-20 0.06 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25
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.
Step 5--Outdoor Fan
Keep the Outdoor fan l?'ee l?'om all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
1. Shut off unit power supply and install lockout tag.
2. Remove outdoor-fan assembly (grille, motor, motor cover,
and fan) by removing screws and flipping assembly onto unit
top cover.
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 23 or 24.
5. Tighten setscrews.
6. Replace outdoor-fan assembly.
Step 6--Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
slu'e to tmw q_' rite electrical power to rite Httit and in.stall lockout
tag.
Remove the top panel to locate all the electrical controls and
wiring. Check all electrical connections lk_r tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed, disassemble the connectiom clean all the parts, restrip the
wire end and reassemble the connection properly and securely.
I .......
3.125 in.
C00021
Fig. 23--Outdoor-Fan Adjustment (030-048 Size)
,....._flP _.., II I/ }
C02017
Fig. 24--Outdoor-Fan Adjustment (060 Size)
Check to ensure no wires are touching refrigerant tubing or sharp
sheet metal edges. Move and secure wires to isolate l_'om tubing
and sheet metal edges.
Al_er inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malluuction has occurred, check
each electrical component with the proper electrical instrumenta-
tion. Reli:r to the unit wiring label when making these checkouts.
NOTE: Reli3r to the Sequence of Operation section, as an aid in
determining proper control operation.
Step 7iRefrigerant Circuit
Inspect all rel}igerant tubing connections and the unit base liar oil
accunmlations annually. Detecting oil generally indicates a rel?'ig-
erant leak.
If oil is detected or if low cooling perIkmnance is suspected,
leak-test all refrigerant tubing using an electronic leak-detector, or
liquid-soap solution. If a rel_'igerant leak is detected, relcr to Check
Ii)r Refl'igerant Leaks section. (See Table of Contents Ii)r page
number.)
If no refl'igeraut leaks are R)und and low cooling perlbrmance is
suspected, reli:r to Rel?'igerant Charge. (See Table of Contents li)r
page number.)
Step 8--Indoor Airflow
The cooling airflow does not require checking unless improper
perlk>rmance is suspected. /[ aproblem eri,_t,_, be .s;uv, that all
.s'ltl)plx'- attd retur;l-air grilles are open and f}'(,e._}'om obstri¢ctions,
attd that the air.filter is clean. When necessary, relier to Indoor
Airflow and Airflow A_[justmeuts section to check the system
airflow.
Step 9--Metering Devices
Rel?'igerant metering devices are fixed orilices and are located in
the inlet header to the indoor and outdoor coils.
Check valves are also located in the liquid lines near the strainers.
The check valves are the smaller of the two components.
Step 10--Lubrication
L'OMPRESSOR The compressor is charged with the correct
amount of oil at the factory.
FAN MOTOR BEARINGS Fan motor bearings are perma-
nently lubricated. No lurtber lubrication of outdoor or indoor fan
motors is required.
Step 11--Liquid Line Strainer
The liquid line strainer (to protect metering device) is made of wire
mesh and is located in the liquid line on the inlet side of the
metering device.
Check valves are also located in the liquid lines near the strainers.
The Strainers are the larger of the two components.
Step 12--High Flow Valves
Located on the cou_pressor hot gas and suction tubes are High
Flow Valves. Large black plastic caps distinguish these valves
with ()-rings located inside the caps. These valves cannot be
accessed lk)r service in the field. Ensure the plastic caps are in
place and tight or the possibility of reI_'igerant leakage could occur.
19

A Open
B Closed
C Open
D Closed
LEGEND
LCS Loss of Charge Switch
] Acutrol Metering Device
r_ Check Valve indicates direction of
(Arrow flow)
HEATING CYCLE
1. Hot gas from compressor flows through the 4-way valve and is
directed to the cooling liquid line check valve. It is then condensed
and directed through subcooling circuits and out to the strainer
and the check valve in the heating liquid line.
2. The refrigerant then feeds the outdoor coil through the Acutrol
metering device on each circuit.
3. Each circuit evaporates the refrigerant and the circuits are com-
bined in the outdoor header with some of the circuits flowing through
the check valve.
4. The refrigerant then flows through the 4-way valve, accumulator,
and back to the compressor.
Fig. 25-Typical Heat Pump Operation, Heating Mode
C95045
2O