Carrier 50ZP036 Dimensions and installation guide

50ZP036-060
3-Phase Single-Packaged Air Conditioners
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 CONSIDERATIONS ..................................................... l
INTRODUCTION .......................................................................... 2
RECEIVING AND INSTALLATION .......................................... 2
Check Equipment ...................................................................... 2
IDENTIFY UNIT ................................................................ 2
INSPECT SHIPMENT ........................................................ 2
Provide Unit Support ................................................................ 2
SLAB MOUNT ................................................................... 2
Provide Clearances .................................................................... 2
Place Unit .................................................................................. 2
Select and Install Ductwork ..................................................... 2
INSTALL FLANGES FOR DUCTWORK CONNEC-
TIONS (50ZPI)6t) ONLY) ................................................... 2
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE ...................... 6
Provide lk_rCondensate Disposal ............................................. 6
Install Electrical Connections ................................................... 7
HIGH-VOLTAGE CONNECTIONS .................................. 7
ROUTING POWER LEADS INTO UNIT ........................ 8
CONNECTING GROUND LEAD TO UNIT GROUND.8
ROUTING CONTROL POWER WIRES .......................... 8
ACCESSORY ELECTRIC HEAT WIRING ..................... 8
SPECIAL PROCEDURES FOR 208-V OPERATION .....8
PRE-START-UP ............................................................................ 9
START-UP ..................................................................................... 9
Check lor Refl'igerant Leaks .................................................... 9
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS: ............................. 9
Start-Up Cooling Section and Make Adjustments ................ 10
CHECKING COOLING CONTROL OPERATION ....... 10
Refrigerant Charge .................................................................. 10
NO CHARGE .................................................................... 10
LOWCHARGE COOLING ............................................... 10
TO USE COOLING CHARGING CHARTS .................. 10
Indoor Airflow and Airflow Adjustn-ients .............................. 10
FOR 208/230-V ................................................................. 11
FOR 460-V MOTORS ...................................................... 11
Unit Controls ........................................................................... l l
HIGH-PRESSURE RELIEF VALVE ............................... 11
COMPRESSOR OVERLOAD .......................................... 11
Sequence of Operation ............................................................ 11
FAN OPERATION ............................................................ 11
COOLING .......................................................................... 11
HEATING .......................................................................... 11
MAINTENANCE ......................................................................... 12
Air Filter .................................................................................. 16
Unit Top Removal (Condenser-Coil Side) ............................ 16
C00155
Fig. liUnit 50ZP
Evaporator Blower and Motor ................................................ 16
Condenser Coil, Evaporator Coil, and Condensate Drain Pan. 16
Condenser Fan ........................................................................ 17
Electrical Controls and Wiring ............................................... 18
Reli"igerant Circuit .................................................................. 18
Evaporator Airflow ................................................................. 18
Metering Devices .................................................................... 18
Liquid Line Strainer ................................................................ 18
TROUBLESHOOTING ............................................................... 18
START-UP CHECKLIST ............................................................ 18
NOTE TO 1NSTALLER--Belk_re installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User's Manual and Replacement Guide are leli with
the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to systen-i pressure and electrical components. Only
trained and qualified workers should install, repair, or service
air-conditioning equipment.
Untrained workers can perlkmn basic maintenance l_.lnctions of
cleaning coils and lilters. All other operations should be perlbm_ed
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 salk:ty precautions that may
apply.
Follow all sallcty codes. Wear sal_:ty glasses and work gloves. Use
quenching cloth lk_runbrazing operations. Have flrc extinguisher
available Ik_rall brazing operations.
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. 50ZP-5SI Pg 1 2-06 Replaces: New

Beliwe perlimning service or maintenance operations on
system, mm off main power to unit. Turn o11'accessory heater
power switch if applicable. Electrical shock can cause serious
injury or death.
Recognize salety in%rmation. This is the sali_ty-alert symbol ,/_.
When yon see this symbol in instructions or manuals, be alert to
the potential lkw personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the sali:ty-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identily unsali: practices which would result in minor personal
injury or product and property danmge. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operatkm.
These instructions cover mininmm requirements and cnnlorm to
existing national standards and salety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that nmy not have kept tapwith changing residen-
tial construction practices. We require these instructions as a
mininmm liw a sail: installation.
INTRODUCTION
50ZP cooling units arc lhlly self-contained and designed lk)r
outdoor installation. (See Fig. 1.) As shown in Fig. 2-4, units are
shipped in a horizontal-discharge configuration lor installation on
a ground-level slab. All units can be field-converted to downflow
discharge configurations lor rooBop applications with a field-
supplied plenum.
RECEiViNG AND iNSTALLATiON
Step 1--Check Equipment
IDENTIFY UNIT
The unit model number and serial number am stamped on the unit
identification plate. Check this inlornmtion against shipping pa-
pers.
INSPECT SHIPMENT
Inspect liw shipping danmge while unit is still on shipping pallet.
I1'unit appears to be damaged or is torn loose from its securing
points, have it examined by transportation inspectors belk)re
removal. Forward claim papers directly to transportation company.
Manufacturer is not responsible lk)rany damage incurred in transit.
Check all items against shipping list. Immediately notily the
nearest Carrier Air Conditioning office il' any item is missing.
To prevent loss or damage, leave all parts in 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. The fiat surface should extend approxinmtely 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 concrete pad or a suitable fiberglass mounting
pad is rccnmmended.
A 6-in. wide gravel apron should be used around the fiat surface to
prevent airflow blockage by grass or shrubs. Do not secure the unit
to the flat surface except where required by local codes.
The unit should be level to within 1/4 inch. This is necessary lkw
the unit drain to function properly.
Step 3--Provide Clearances
The required minimmn service clearances and clearances to
combustibles are shown in Fig. 2-4. Adequate ventilation and
condenser air naust be provided.
The condenser fan pulls air through the condenser coil and
discharges it through the fan on the top cover. 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
mininnma clearance under a partial overhang (such as a nornml
house overhang) is 48 in. above the unit top. The nmximum
horizontal extension ol' a partial overhang must not exceed 48
inches.
Do not restrict condenser airflow. An air restriction at either
the outdoor-air inlet or the fan discharge can be harmful to
coFilpressor lili:.
Do not place the unit where water, ice, or snow l]'onaan overhang
or roof will danmge or flood the unit. The unit may be installed on
wood flooring or on Class A, B, or C roof covering materials.
Step 4--Place Unit
Unit can be moved with the handholds provided in the unit
basepan. Relier to Table 1 lor operating weights. U_se extreme
caution to prevent rlamage when moving the unif. Unit nlu,_t
remain in an 1q)right position during all tooling operations. The
unit must be level li)r proper condensate drainage; the ground-level
pad nmst be level beli_we setting the unit in place. When a
field-fabricated support is used, be stare that the support is level
and that it properly supports the unit.
Step 5--Select and Install Duetwork
The design and installation ol' the duct system must be in
accordance with:
• the standards of the NFPA (National Fire Protection Associa-
tion) lor 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 of Heating, Refrigera-
tion, and Air Conditkming Engineers) recommendations.
Use the duct flanges provided on the supply- and return-air
openings on the side of the unit. See Fig. 2-4 lor connection sizes
and locations. The 14-in. round duct collars (size 036-048 units)
are shipped inside the unit attached to the indoor blower. They are
field-installed and nmst be removed frona the indoor cavity prior to
start-up, even if they are not used lor installation.
INSTALL FLANGES FOR DUCTWORK CONNECTIONS
(50ZP06t) ONLY)
The 51)ZP060 units are shipped with flanges which must be
field-installed on the unit.
To install unit flanges:
1. Five pieces of flange are shipped on the return-air opening of
the unit. Remove the flanges li"om the shipping position. See
Fig. 5. Screws arc field-supplied.
2. One piece of flange is used as it is shipped (straight). Bend the
other 4 pieces at right angles.
3. Install the straight flange Oll the right side of the return-air
opening in holes provided. See Fig, 6. Flanges should stick out
fi'om unit to allow lk)r connection of ductwork.

[
</
[95
!
II
CON;)
¢0 N\
_ r'94 ,3 _4080
[ ,/] 16 06]
\\
°1o
REQUIRED CLEARANCE TO COMBUSTIBLE MATE INCHES [mini
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
50ZP036
LEFT SIDE VIEW FRONT VIEW 26.772
[10540] '°6 L ; 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
250 114
CENTER OF GRAVITY IN.
X Y Z
355.6 (14.00) 508.0 (20.00) 241.3 (9.50)
Fig. 2--Unit Base Dimensions, 50ZP0036

_29S 0 408 0
_ii:sis LI6:oeJ
247 6
i9 75]
REAR VIEW
COND 5SfiR \
CO_
i
EVS_PC,R,_ICR _
CO_L N,
3560 b, _
{4 {',
[}[ ',"I 0 [ ' t ( 8
12950
i5098]
50TTOM OF UNiT
REQUIRED CLEARANCE TO COMBUSTIBLE _IATL. 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 UNITS, POWER ENTRY SIDE .................................... 42.00 1066.8
UN T AND UNGROUNDED SURFACES, POWER ENTRY S DE .36.00 9 4.0
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 .............................................. 30.60 [762.0]
POWER ENTRY SIDE .................................................................... 30.00 [762.0]
(EXCEPT FOR NEC REOUIREMENTS)
UNIT TOP ....................................................................................... 48.00 1219.2
S DE OPPOS TE DUCTS .............................................................. 30.60 762.0
LEGEND
NEC - National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from ouMoor-
1an discharge, with the exception ol 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.
%4 I H
Im
I i_ 8i2
ir
[[CdiER, CCNIRO[ DO'( AND
',APORAI',}R COIl ACC SS P##Ei
COMPRESSOR PANEL \
i 6tiC
LEFT SIDE VIEW FRONTVIEW , 0_0_
UNIT
50ZP042
50ZP048
[250]
RIGHTSIDEVIEW C00003
UNIT WEIGHT CENTER OF GRAVITY IN.
ELECTRICAL CHARACTERISTICS Ib kg X YZ
208/230-3-80 297 135 355.8 (14.00) 508.0 (20.00) 304.8 (12.00)
208/230-3-80 310 141 355.8 (14.00) 508.0 (20.00) 304.8 (12.00)
Fig. 3--Unit Base Dimensions, 50ZP042_48

1176
[465]
3525
88]
3.5
44]
COND,
COIL_
I
\\\ -
DIMENSIONS IN [] ARE IN INCHES
_3528 [1389]
_35217[IBIB9]
_537 [211]
O n
REAR VIEW
12950
[50198]
BOTTOM OF UNIT
EVAP. t
//
706
[27
L
889 J
[350]
LEFT SIDE VIEW
UNIT
50ZP06O
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
Ib kg
350 159
_5490 [2161]
Fig. 4--Unit Base Dimensions, 50ZP060
ELECTRICAL CHARACTERISTICS
208/230-3-60, 460-3-80
CENTER OF GRAVITY IN.
X Y Z
385.6 (14.00) 508.0 (20.00) 355.6 (14.00)
\/
I.D. RIGHT SIDE VIEW C00158

4. Install 2 laand-lbrmed flanges onto return air opening in boles
provided to li)rm a rectangle around the return air opening.
5. Install remaining 2 hand-lkmned flanges around discharge air
opening in holes provided.
6. Ductwork can now be attached to flanges.
When designing and installing ductwork, consider the lbllowing:
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 ol' the unit. Recommended sizes lot filters are
shown in Table I.
Avoid abrupt duct size increases and reductions. Abrupt change
in duct size adversely al'li:cts air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal.
Size ductwork lot cooling air quantity (clan). The minimum air
quantity lbr proper electric beater operation is listed in Table 2.
Heater limit switches may trip at air quantities below those
recommel'ided.
Insulate and weatherprool' 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 lk}r residential beating and air conditioning
systenls.
Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or roof according to
good construction practices.
Figure 8 shows a typical duct system with 50ZP unit installed.
HAND FORM
STRAIGHT PIECE C00006
Fig. 6--Flanges Installed on 50ZP060 Units
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE
Belore perlbrming service or maintenance operations on
systeln, turn olT main power to unit. Turn off accessory beater
power switch if applicable. Electrical shock can cause serious
injury or death.
Units are dedicated side supply products. They are not convertible
to vertical air supply. A field-supplied plenum must 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.
Unit removes condensate through a 1-3/64-in. 1D bole which is
located at the end of the unit. See Fig. 2-4 lot location of
condensate connection.
FIVE PIECES OF DUCT
FLANGE ATTACHED
HERE FOR SHIPMENT
COOOO5
Fig. 5--Shipping Location of Duct Flanges
(Size 060 Only)
C00007
Fig. 7--Area Not to Be Drilled More Than 3/4-in.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground-
level installations. Install a Held-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

Table 1 -- Physical Data
UNiT 50ZP 036 042 048 060
OPERATING WEIGHT {Ibs) 250 297 310 350
COMPRESSOR TYPE Reciprocating
REFRIGERANT Charge (Ib)
REFRIGERANT METERING DEVICE
CONDENSER COiL
Rows... Fins/in.
Face Area {sq ft)
CONDENSER-FAN MOTOR CFM
Nominal Rpm
Motor Hp
Diameter (in,)
EVAPORATOR COiL
Rows... Fins/in.
Face Area (sq ft)
EVAPORATOR 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.
4.7 J [ 7.5
2...17 2...17
8.2 10.7
2OOO
1100
1/4
2O
28OO
1100
1/4
2O
3...18 4...15
3.1 4.9
10x8
1200
800-1050
3
Low
1/2
4.4 __ 8.1
AcutroFMDevice
Copper Tubes, Aluminum Plate Fins
1...17 2...17
11.1 8.8
Propeller
2600 2600
1100 1100
1/4 1/4
20 20
Copper Tubes, Aluminum Plate Fins
3...15 3...15
3.9 4.3
Direct Drive
10x9 10x9
1400 1800
800-1050 1000-1100
3 2
Med Low
1/2 3/4
Round
14
14
24 x 24 | 24 x 30
/
Z
10 x 10
1850
950-1100
3*,2*
Low
1
Square
13.9 x 13.9
13.9 x 27.8
24 x 24 1 24 x 30
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.
condensate connection to prevent the pan b*Olnoverflowing. See
Fig. 9 and 10. Prime the trap with water. When using a gravel
apron, make sure it slopes away li"om the unit.
If the installation requires draining the condensate water away
from the unit, install a 2-in. trap using a 3/4-in. OD robing or pipe.
(See Fig. 9 and 10.) 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.
CPVC, or 3/4-in. copper pipe (all field supplied). Do not undersize
the tube. Pitch the drain tube downward at a slope of at least 1 in.
%r every 10 11of horizontal run. Be sure to check the drain tube
%r leaks. Prime trap at the beginning of the cooling season
start-up. Allowable glues lbr condensate trap connection are:
Standard ABS, CPVC, or PVC cement.
Step 7--Install Electrical Connections
The unit cabinet nmst have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of an electrical wire connected to the unit ground in
the control compamnent, 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.
W . t!
Failure to R_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-
tiens 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 %r 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 %r highest voltage contained
within conduit when low-voltage control wires are run in
same conduit as high-voltage wires.
5. Do net damage internal components when drilling through
any panel to mount electrical hardware, conduit, 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
from the unit. Relier to the unit rating plate lk_r maximum
fuse/circuit breaker size and mininmm circuit amps (ampacity) lot
wire sizing. See Table 3 lbr electrical data.
The field-supplied disconnect may be mounted on the unit over the
high-voltage inlet hole. See Fig. 2-4.

*S÷pa_atedlscgnneetper NEC
/NationalElectrlcalCode/ required
forelectrr¢heatel¸_,nenOngle
pointcone_t_onIs not use_
Fig. 8--Typical installation C00008
1"(25ram)MIN.
TRAP
2" (50ram)MIN.
C99013
Fig. 9--Condensate Trap (Using Tubing)
1" min.
TRAP
OUTLET
2" min.
C00009
Fig. lO--Condensate Trap (Using PVC Piping)
Table 2--Minimum Airflow for Safe Electric Heater
Operation (CFM)
SIZE
036104210481060
1200 1225 1400 1750
Operation of unit on improper line voltage constitutes abuse
and may cause unit damage that could all,c1 warranty.
ROUTING P()WER LEADS INTO UNIT
Use only copper wire between disconnect and unit. The 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 the hole on the control box side of the
unit (see Fig. 11 l_)r location). When the leads are inside the unit,
run leads to the control box (see Fig. 12). On 3-phase units,
connect the leads to the black, yellow, and blue wires (see Fig. 13.)
CONNECTING GROUND LEAD TO UNIT GROUND
Refer to Fig. 12 and 13. Connecl the ground lead to the chassis
using the unit ground lug in the conlrol box.
ROUTING CONTROL POWER WIRES
Form a drip-loop with the thermostat leads belk)re routing them
into the unit. Route the thermostat leads through grommeted hole
provided in unit into unit control box. (See Fig. 11.) Connect
thermostat leads to unit control power leads as shown in Fig. 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 translormer supplies 24-v power liar complete system
including accessory electrical beater. Translk_rmer is factory wired
lk)r 23(1-v operation. If supply voltage is 208 v, rewire translk_rmer
primary as described in the Special Procedures lk)r 2(18-v Opera-
tion section below.
ACCESSORY ELECTRIC HEAT WIRING
Refer to accessory electric beat installation instructions lk)rinl_)r-
marion on installing accessory electric beat. Accessory electric
heat wMng is shown in Fig. 15.
SPECIAL PROCEDURES FOR 208-V OPERATION
! vv. -s
Make sure thai the power supply to the unit is switched OFF
before making any wMng changes. Electrical shock can cause
serious injury or death.
1. Remove wirenut from connection of ORG wire to BLK wire.
Disconnect the ORG translormer-primary lead from the BLK
wire. Save wimnut. See unit wiring label.
2. Remove the wirenut from the terndnal on the end of the RED
transfl}rmer-primary lead.
3. Save the wirenut.
4. Connect the RED lead to the BLK wire ff(}nl which the ORG
lead was disconnected. Insulate with wirenut from Step 1.
5. Using the wirenut removed fi'om the RED lead, insulate the
loose terminal on the ORG lead.
6. Wrap the wirenuts with electrical tape so thai the metal
terminals cannot be seen.
Indoor blower-motor speeds may need to be chan(_edef'or 2(18-v
operation. Refer to Indoor Airflow and Airflow Adjnslments
section. (See Table o1' Contents li)r page number.)

PRE-START-UP
Failure to observe the lollowing warnings could result in
serious inju Uor death:
1. Follow recognized sali: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 until all electri-
cal sources are disconnected.
4. Relieve all pressure li"omboth high- and low-pressure sides
of the system beli)re touching 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 reli"igerant under pressure. To remove a
component, wear protective goggles and proceed as lol-
lows:
a. Shut o1"1electrical power to unit.
b. Relieve all reli"igerant 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 li"om unit.
d. Carefully unsweat remaining 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 lkHlows to inspect and prepare the unit lk)r initial
start-up:
1. Remove all access panels.
HIGH-VOLTAGE LOW-VOLTAGE
POWERWIRING WIRING ENTRY
ENTRY HOLE HOLE
Fig. 11--Unit Electrical Connection
C00010
2. Read and lollow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with, unit.
Make the li)llowing inspections:
a. Inspect liar shipping and handling damages such as broken
lines, loose parts, disconnected wires, etc.
COMPRESSOR TRANSFORMER
CONTACTOR
\
O O
O
o© O
ELECTRIC GROUND INDOOR OUTDOOR FAN MOTOR HIGH
HEATER LUG FAN AND COMPRESSOR VOLTAGE
FUSES RELAY START CAPACITOR LEADS
C00011
Fig. 12--Control Box Wiring
b. Inspect R)r oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a reli"igeraut
leak. Leak-test all reli"igeraut tubing connections using
electronic leak detector, or liquid-soap solution. If a reli"ig-
eraut leak is detected, see l'ollowiug Check for Refrigenmt
Leaks section.
c. Inspect all field- and factory-wiring connections. Be sure
that connections are completed and tight.
d. Inspect coil fins. If damaged during shipping and handling,
carefully straighten fins with a l]u comb.
3. Verify the liHlowing conditions:
a. Make sure that outdoor-fan blade is correctly positioned in
fan orifice. Top edge of blade should be 3.125 in. down
from condenser outlet grille. See Condenser Fan section.
(Reler to the Table of Contents lk)r page number.)
b. Make sure that air filter is in place.
c. Make sure that condensate drain pan and trap are filled with
water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose parts have
been removed.
START-UP
Use the Start-Up Checklist supplied at the end of this book and
proceed as lollows:
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, locate leaks and
reclaim remaiuing refrigerant to relieve system pressure.
2. Repair leak lidlowiug accepted practices.
NOTF: Install a filter drier whenever the systen_ has been opened
liar repair.
3. Check system liar leaks using an approved method.

3-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
GROUND
LEAD
SINGLE-PHASE I_-
CONNECTIONS 4-
TO DISCONNECT[ L-
PER NEC L_ .....
L ......
UNIT GROUND
4333
_ Z_ BLK-
Fig. 13--Line Power Connections C00012
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are lound.
5. Charge unit with R-22 refrigerant, using a volumetric-
charging cylinder or accurate scale. R@,r to nnit rating plate
.fi)r reqtlired charge. Be stare to add extra refi'igerant to
compensate flw internal volume of field-installed filter drier.
Step 2--Start-Up Cooling Section and Make Adjustments
Complete the required procedures given in the Pre-Start- Up
section this page belore starting the unit. Do not jumper any
salL'ty devices whelk operating the unit.
Do not operate the compressor when the outdoor temperature
is below 40 ° F.
Do not rapid-cycle the compressor. Allow 5 minutes between
"on" cycles to prevent conapressor damage.
CHECKING COOLING CONTROL OPERATION
Start and check the unit lkw proper cooling control operation as
Rfllows:
I. Place room thermostat SYSTEM switch ilk 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 ilkCOOL position and FAN switch ilk
AUTO position. Set cooling control below room temperature.
Observe thai compressor, condenser fan, and evaporator
blower motors start. Observe that cooling cycle shuts down
when control setting is satisfied.
3. When using an automatic changeover room thermostat, place
both SYSTEM and FAN switches ilk AUTO. positions.
Observe that unit operates in Cooling mode when temperature
control is set to "call lk)rcooling" (below room temperature).
Step a--Refrigerant Charge
Amount of refi'igerant charge is listed on unit nameplate (also l'eler
to Table 1). Relk_l:to Carrier Refi'igerant Service Techniques
Manual, Refi'igerant section.
Unit panels nmst be in place when unit is operating during
charging procedure.
NO CHARGE
Use standard evacuating techniques. After evacuating system,
weigh in the specified amount of refi'igerant. (Relk_rto Table 1.)
LOW CHARGE COOLING
Use Cooling Charging Charts, Fig. 17 20. Vary refi'igerant until
the conditions of the appropriate chart are met. Note that charging
charts are different from the type normally used. Charts are based
10
<b
@
THERMOSTAT
AND SUBBASE
L_RED--4
_YEL---_
UNIT CONTROL BOX
Fig. 14--Control Connections C00013
on charging the units to the correct superheat lot the various
operating conditions. Accurate pressure gauge and temperature
sensing device are required.
To measure suction pressure, perl_wm the flfllowing:
1. Connect the pressure gauge to the service port on the suction
line.
2. Mount the temperature sensing device on the suction line and
insulate it so that outdoor ambient temperature does not al]bct
the reading. Indoor-air cfin nmst be within the normal oper-
ating range of the unit.
TO USE COOLING CHARGING CHARTS
1. Take the outdoor ambient temperature and read the suction
pressure gauge.
2. RelL'r to appropriate chart to determine what the suction
tenq)erature should be.
3. If suction temperature is high, add refrigerant. If suction
temperature is low, carefully recover some of the charge.
4. Recheck the suction pressure as charge is adjusted.
EXAMPLE: (Fig. 17)
Outdoor Temperature ................. 85° F
Suction Pressure ................. 80 psig
Suction Temperature should be........70 ° F
(Suction Temperature may vary +5°F.)
If Chargemaster® charging device is used, temperature and
pressure readings must be accomplished using the charging chart.
Step 4--Indoor Airflow and Airflow Adjustments
For cooling operation, the recommended airflow is 350 to 450
cfm ])el"each 12,000 Btnh o["rated cooling capacily.
Table 4 shows dry coil air delivery lot 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 a_[justed properly.
Disconnect electrical power to the unit belk)re changing
blower speed. Elech'ical shock can cause injury or death.
Airflow can be changed by changing the lead connections of the
blower motor.
Units 50ZP036, 048, and 060 blower motors are factory wired lbr
low speed operation. Units 50ZP042 are lhctory wired flw medium
speed operation.

C _ = BRN(COMMON=)
W1_4. - _VLO.[S_TE_P_2_.
Wl_ = VVHT_SZEPjL ....
TO
UNIT POWER
WIRING
FUSE BLOCK
F3_[YEL
LI_.--_ _
qI
I
i CONTACTOR 2
. YEL YEL
I
I
J
CONTACTOR 1
-BRN
:l °l
AYTQ:LIM!T BLK
C00014
Fig. 15--Accessory Electric Heater Wiring
FOR 208/230-V
The motor leads are color-coded as lollows:
3-SPEED 2-SPEED
black = high speed black = high speed
blue = medium speed
red = low speed red = low speed
To change the speed of the blower motor IBM), remove the fan
motor speed leg lead li"om the indoor (evaporator) fan relay (IFR)
and replace with lead Ik)r desired blower motor speed, lnsuh_te the
removed lead to (n,oM colztact with chassis parts.
FOR 460-V MOTORS
The motor leads are color coded as Ik)llows:
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 blower motor IBM) from low speed to
high speed, remove the red lead li"om the indoor-fan relay (A1FR).
Insulate the red lead to avoid contact with any chassis parts.
Separate the black lead li"om the purple lead. Connect the black
lead to the IFR. Insulate the purple lead to avoid contact with any
chassis parts.
Step S--Unit Controls
All compressors have the R)llowing internal-protection controls.
HIGH-PRESSURE RELIEF VALVE
This valve ()pens when the pressure dilli_rential between the low
and high side becomes excessive.
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 salt: level.
This overload may require tap to 60 minutes (or longer) to reset;
therefiwe, if the internal overload is suspected of being open,
disconnect the electrical power to the unit and check the circuit
through the overload with an ohmmeter or continuity tester.
Step 6--Sequence of Operation
FAN OPERATION
The FAN switch on the thermostat controls indoor l_m operation.
When the FAN switch is placed in the ON position, the IFR
(indoor-lhn 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 IFM 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 there is not a call lor cooling). The contacts open
and the 1FM is deenergized. The IFM will be energized only when
there is a call lot cooling, or if the unit is equipped with accessory
electric heat, the indoor-fan motor will also run while the acces-
sory electric heat is energized.
NOTE: 50ZP060 unit is equipped with a time-delay relay. On this
unit, the indoor fan remains on lkw 30 seconds after G or Y is
deenergized.
COOL1NG
On a call lbr cooling, the compressor contactor (C) and the 1FR are
energized through the Y and G terminals of the thermostat. On
units with a compressor time-delay relay, there is a 5-minute (+ 45
sec) delay between compressor starts. Energizing the compressor
contactor supplies power to the compressor and the outdoor
(condenser) fan motor (OFM). Energizing the IFR provides power
to the 1FM.
When the need lor cooling has been satisfied, the OFM, compres-
sor, and 1FM (FAN on AUTO) am deenergized. If the unit is
equipped with a 30-second delay, the indoor fan will remain
energized Ibr 30 seconds alter the compressor is deenergized (060
unit only).
HEATING
If accessory electric heaters are installed, on a call lor heat the
thermostat energized the W relay which energizes the electric
heaters. 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 Ii)r heating is satisfied, the
heater and 1FM are deenergized.
II

Table 3--ElectdcaJ Data--50ZP
UNIT 50ZP
SIZE
036
042
048
060
V-PH-HZ
208/230-3-60
208/230-3-60
208/230-3-60
208/230-3-60
VOLTAGE
RANGE
MIN MAX
187 254
187 254
187 254
187 254
460-3-60 414 508
(See legend following Electrical Datacharts)
COMPRESSOR OFM IFM
FLA FLA
RLA LRA
ELECTRIC HEAT
Nominal KW* FLA
-/. -/-
3.8/5.0 10.4/12.0
8.9 64.5 1.5 2.8 7.5/10.0 20.8/24.1
11.3/15.0 31.3/36.1
15/20 41.7/48.1
-/. -/-
3.8/5.0 10.4/12.0
10.9 73 1.5 2.8 7.5/10.0 20.8/24.1
11.3/15.0 31.3/36.1
15/20 41.7/48.1
-/. -/-
3.8/5.0 10.4/12.0
12.3 73 1.5 4.2 7.5/10.0 20.8/24.1
11.3/15.0 31.3/36.1
15/20 41.7/48.1
-/. -/-
3.8/5.0 10.4/12.0
16.3 114 1.4 5.8 7.5/10.0 23.8/24.1
11.3/15.0 31.3/36.1
15.0/20.0 47.7/48.1
5 6
7.4 64 0.7 2.6 10 12
15 18
20 24
SINGLE POINT POWER SUPPLY
MCA
15.4/15.4
16.5/18.5
29.6/33.8
42.6/48.8
55.6/63.8
17.9/17.9
17.9/18.5
29.6/33.8
42.6/48.8
55.6/63.8
21.1/21.1
21.1/21.1
31.3/35.3
44.3/50.4
57.4/65.4
27.8/27.5
27.5/27.5
33.3/37.3
46.3/52.3
59.3/67.3
12.8
12.8
18.3
25.8
33.3
FUSE OR MOCP
HACR BKR
25/25
35/25
50/50
25/25
40/40
50/80
60/70
60/70
80/90
30/30 25/25
40/40 25/28
50/80 35/80
45/80
80/701-
35/35 35/35
50/50 35/35
60/80 35/40
50/80
80/701-
20 20
25 20
35 20
40 30
50 35
LEGEND Q
FLA -- Full Load Amps
LRA -- Locked RotorAmps C US
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 amotor where aphase 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 volta e deviation from avera e volta e
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.
DISCONNECT SIZE
FLA LRA
15/15
15/17
27/31 74
39/45
51/59
17/17
17/17
27/31 83
39/45
51/59
21/21
21/21
28/32 87
41/46
53/60
27/27
27/27
31/34 131
43/48
55/62
15 70
15 71
18 71
24 71
31 71
MAINTENANCE
To ensure continuing high perflmnance, and to reduce the possi-
bility of premature equipment failure, periodic maintenance must
be perlormed on this equipment. This cooling unit should be
inspected at least once each year by a qualified service person. To
troubleshoot cooling of units, refer to Troubleshooting chart in
back of book.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
The ability to properly perlorm maintenance on this equip-
ment requires certain expertise, mechanical skills, tools and
equipment, l[f you do not possess these, do not attempt to
perlimn any maintenance on this equipment, other than those
procedures recommended in the User's Manuah FAILURE
TO HEED THIS WARNING COULD RESULT 1N SERI-
OtIS INJURY, DEATH OR DAMAGE TO THIS EQUIP-
MENT.
The minimum maintenance requirements l_}rthis equipment are as
%llows:
12

SCHEMATIC
Sm _ 208/230 3 50
51ZE 2 AWG FIELD u_L_BLK BLK _ BLKI____ I CAr_p2YEL OFM
I P_- _YEL F -- .... --I-,_--,ELI YEL_;BRN_I_
5UPPLY YEL YEL QT_
ELECTRIC HEAT _ LI_ m_mmm_L<_ 1 I _ OLU 3w V....
OPTIONONLY. .,ia----------_LK-4P--k----_I I IFR YEL_'--'_________._
UBEDHEATERWITHoPTIONS POWER L2_ YEL _ OVERLOAD PROTECTOR
SUPPLY L3 BLUI BLU {03B, O4B 80BO) ALL EXCEPT 048
MAXIMUM WIRE I_ _..i_==#J--L-4-.1 1 _ TDR_ _ ,n /-
SIZE 2 AWO I° _ L IIBLU__RED _ _RED_
• SINGLE POINT CONNECTION BO_ I __L-BLU "''BLU_ \
SEE ELECTRIC _ i _ I k (0_,042 & O_ _ _BLK_ _ IFM
FF_ _LK_ _'"I LLECTR_C" QTCAP_"-'=_--------GRNYEL------1
USED WITH BLK HEATERS
ELECTRIC HEAT I"J_=_YEL_YELJ_ I '
_O_I_LY. _ p_ _YEL_ I YEL
HEATER OPTIONS 1 I_YEL_ I | I --
LS__BLU_ I I I
I_LU_ I, _ I I F- ....
MAXIMUM WIRE k_f_J_iN T -- _ I I IGRN_BRN-
SIZE 210 AWG I --_--
_ AN, F...... /
_-RED _RED_BRN_BRN = -- BRN--
F!
_RED RED I
____ON _C036,042 _ 060) R BRN 24V SPLICE
.............. BOX
..... YEL ..... YEL_BRN _R_R, 3
IWHT _ _ _ _ _ _ _ _ _BRN_ 24V 5PLICE
14 ,ox
4EA_ _ I-_- I / / IO,OKWANDABOVE _ _ _ _l
]
COMMON
(SEE NOTE_2) BRN_ I _ I _ I _ I _ I BRN HR1 i
BRN' 'BRN TDRj3 OR
IFR;3
24VBS_ICE LEGEND
COMPONENT ARRANGEMENT
(ii}
COMP
BLK--{iS)
YEL
BRN
_R INDOOR FAN
BLOWER HOUSING
GND
.......L_ _
= i
_ RN YELI E .......
BRN HEAT
BRN _CCESSOR_
............ACCESSORYONLYEQuIPGND __ ........ _ ' _@OFM CAP _ .....
DISCONNECT 24V POWER ENTRY
ER NEC
FIELD SPLICE C CONTACTOR,COMPRESBOR
CAP CAPACITOR
{x) MARKED WIRE COMP COMPRESSOR MOTOR
EQUIP EQUIPMENT
TERMINAL (MARKED) FL FUSE LINK
0 TERMINAL (UNMARKED) FU FUSE
OND GROUND
TERMINAL BLOCK HR HEATER RELAY (STRIP HEAT)
@ SPLICE ]FM INDOOR FAN MOTOR
SPLICE (MARKED) IFR INDOOR FAN RELAY
IP INTERNAL PROTECTOR
-- FACTORY WIRING OFM OUTDOOR FAN MOTOR
QT _UADRUPLE TERMINAL
i i FIELD CONTROL WIRING BB SLOW BLOW FUSE
i FIELD POWER WIRING TB TERMINAL BLOCK
TDR TIME DELAY RELAY
_I_ ACCESSORY OR OPTIONAL WIRING TH THERMOSTAT HEATING
TO INDICATE COMMON TRAM TRANSFORMER
POTENTIAL ONLY,
NOT TO REPRESENT WIRING
NOTES
1.IF ANY OF THE ORIGINAL WIRE FURNISHED
MUST BE REPLACED,IT MUST BE REPLACED
WITH TYPE 90_C WIRE OR ITS EQUIVALENT.
2ISEE PRICE PAGES FOR THERMOSTAT
AND SUBBASE FAN SEQUENCE FOR TDR
3.5ET HEAT ANTICIPATOR AT .6 TDR
0 T T+30
Fig. 16A--Wiring Diagram 208/230-3-60 A06023
13

HEAT SCHEMATIC
ELECTRIC
HEATERS _I
=RED
BLK
L_ OFM
CAP2 YEL
YE BRN
QT /
BLK_
3LU COMP
gEL
OVERLOAD PROTECTOR
RED_----'_
c_L_
YEL IFM
QT CAP1 --
BRN--
THERMOSTAT SUB BASE R BRN 24V SPLICE
I _AB_ _ _GRN IGRN_ _BRN_D C
YEL YEL_BRN"_IcOOL TDR
i WHT ....... mm_mmmmm_VFT_ _BRN-- 2_ X......
H1 m ....
_OOL SEE ACCESSORY HEATER LABEL
_OM_ _ _VIO -- _ -- _ -- _ -- _VI_ CONNECTIONS. I
_T_ i-IH2 I I _I IO'OKWANDABOVE/ _- _!
.....t
_BRN _ J _ J _ J _ J _ J _BRNJ HRI m
I IT
(SEE NOTE_21
_L_BRN -- BRN-- TDR;B
LEGEND
FIELD SPLICE
COMPONENT ARRANGEMENT
BLK_
YEL
<_D _ BRN
<_ COMP
_ INDOOR FAN
_ ON:°WERH°US'N
........L_i----l
r S_Gg_ m_ @G RN YEL-- | _cLc_EC_s_OIRCyi
NT J ._ .B_LU_ TD_ _l
............. i_ /' '_1_1 _1 cCFAMP2cAP IFC_Pc1Apm_ --
ELECTRIC HEAT IAOOESSORYONLYr'P'@ @
EQUIP GND _ _- E 24V#0PxLIC E
C ,COMPRESSOR
CAP CAPACITOR
MARKED WIRE COMP COMPRESSOR MOTOR
@ TERMINAL (MARKED) EQUIP EQUIPMENT
FL FUSE LINK
0 TERMINAL (UNMARKED) OND GROUND
HR HEATER RELAY (STRIP HEAT)
TERMINAL BLOCK IFM INDOOR FAN MOTOR
@ SPLICE IP INTERNAL PROTECTOR
SPLICE (MARKED) OFM OUTDOOR FAN MOTOR
QT QUADRUPLE TERMINAL
FACTORY WIRING TB TERMINAL BLOCK
TDR TIME DELAY RELAY
FIELD CONTROL WIRING TH THERMOSTAT HEATING
FIELD POWER WIRING TRAN TRANSFORMER
_m_ ACCESSORY OR OPTIONAL WIRING
_ TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
NOTES
WITH TYPE 90"C WIRE OR ITS EQUIVALENT.
2,5EE PRICE PAGES FOR THERMOSTAT
AND 5UBBASE PART NUMBERS.
3ISET HEAT ANTICIPATOR AT ,6
4.USE 75_C COPPER CONDUCTORS ONLY.
24V POWER ENTRY
FAN SEQUENCE FOR TDR
5,FOR HIGH SPEED IFM, D[SCONNECT BLU
WIRE FROM TDRj3 AND CONNECT BLK TDR 'l
(1,3) i i
o T T+30
G G
AND CONNECT ORN WIRE FROM [FM. ENERGIZED DE ENERGIZED
Fig. 16B--Wiring Diagram 460-3-60
14
A06024

75E 110 258 110
88E 100
48:_70
41_ _60
zu750
27E 40
OUTDOORTEMP
_F _C
115 46
I 105 41
I _ 95 35
_, 75 24
f
_" _" 45 7
f
,Z
58B 1 O0
2821 90
80
%
u_
_483 _70
W
w
z414 z60
o_ g
D
mSO
278 40
30
II
OUTDOORTEMP
oFoO
115 46
105 41
-'_ "]_ -'_ 95 35
->
,,1_ _I 55 13
I I/ 45 7
3O
30 40 50 50 70 80 90
SUCTION LINE TEMPERATURE (°F)
IIIII II
4 10 15 21 27 32
SUCTION LINE TEMPERATURE ('C]
C00017
Fig. 17--Cooling Charging Chart, 50ZP036 Units
30
I
40 SO 50 70 80 90
SUCTION LINE TEMPERATURE (°F)
III III
4 I0 15 21 27 32
SUCTION L]NE TEMPERATURE ("C]
C00019
Fig. 19--Cooling Charging Chart, 50ZP048 Units
258 II0
589 ] O0 OUTOOORTEMP
oF oc
125 52
--_ _. _' t ' 115 46105 41
_821 90 ,,, _ t 95 35
u3 _
oEgO _' _" _ 75 24
u_ " 65 18
., -" _.'r_ 4_ 7
g g i i i i
mSO _
m
278 40
3O
75E 110 HH
58E 100
34E U_so
27E 40
30
3O
C,
OUTDOORTEMP
_F _6
115 46
"_" 105 41
_" 95 35
'_ _ 85 29
_, _, ,,_ 75 24
_' _' _ _' 65 18
'_' 55 13
_" 45 7
,#
40 50 50 70 80 90
SUCTION LINE TEMPERATURE (°F)
I I I I I I
4 10 15 21 27 32
SUCTION LINE TEMPERATURE ('C]
C00018
Fig. 18--Cooling Charging Chart, 50ZP042 Units
30
I
40 SO 50 70 80 90
SUCTION LINE TEMPERATURE (°F)
III III
4 10 15 21 27 32
SUCTION L]NE TEMPERATURE ("C]
C00020
Fig. 20--Cooling Charging Chart, 50ZP060 Units
15

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 season lbr cleanliness. Clean when neces-
sary.
3. Inspect blower motor and wheel lor cleanliness each cooling
season. Clean when necessary. For first heating season,
inspect blower wheel bimonthly to determine proper cleaning
b'equency.
4. Check electrical connections lbr tightness and controls l_r
proper operation each cooling season. Service when neces-
sal-y.
5. Check the drain channel in the top cover periodically lbr
blockage (leaves, insects). Clean as needed.
Failure to lbllow these warnings could result in serious injury
or death:
1. Turn olTelectrical power to the unit belore perlorming any
maintenance or service on the unit.
2. Use extreme caution when removing panels and parts. As
with any mechanical equipment, personal injuUcan result
li"om sharp edges, etc.
3. Never place anything combustible either on, or in contact
with_ the unit.
Step 1--Air Filter
Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the
same dfinensional size and type as originally installed. See
Table 1 lk_rrecommended 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 provide& when necessary.
Step 2--Unit Top Removal (Condeneer-Coil Side)
NOTE: When perlorming maintenance or service procedures that
require removal of the unit top, be sure to perli)rln 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 belbre
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
Relier to the lollowing 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. Lil_ top b'om unit carefully. Set top on edge and make stare
that top is supported by unit side that is opposite duct (or
plenum) side.
4. Carefully replace and secure unit top to unit, using screws
removed in steps 1 and 2, when maintenance andk_r service
procedures ale completed.
Step 3--Evaporator Blower and Motor
For longer lili:, operating economy, and continuing efficiency,
clean accunmlated dirt and grease li"om the blower wheel and
motor annually.
Disconnect and tag electrical power to the unit belk_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 lbllows:
a. Remove top access panel.
b. Remove 3 screws that hold blower orilice ring to blower
housing. Save screws.
c. Loosen setscrew(s) which secure wheel to motor sbalk.
2. Remove and clean blower wheel as lbllows:
a. Lilt wheel li"om 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 li"om wheel
and housing with vacuum cleaner, using a solk brush
attachment. Remove grease and oil with a mild solvent.
c. Reassemble blower into housing. Place tapper orifice ring
on blower to judge location of the blower wheel. Blower
wheel should be approximately 0.2-in. below bottom ol'
orifice ring when centered correctly. Be stare setscrews are
tightened on motor and are not on round part of shali.
d. Set tapper orifice ring in place with 3 screws removed in
step 1.
e. Replace top access paneh
Step 4--Condenser Coil, Evaporator Coil, and Conden-
sate Drain Pan
Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year. Proper inspection and cleaning
requires the removal of the unit top. See Unit Top Removal section
ahoy('.
The coils are easily cleaned when dry; therelbre, inspect and clean
the coils either belore or alter each cooling season. Remove all
obstructions (including weeds and shrubs) that interli.:rc with the
airflow through the condenser coil. Straighten bent fins with a fin
comb. If coated with dirt or lint, clean the coils with a vacuum
cleaner, using a sol1 blq.lsh attachment. Be careful not to bend the
fins. If coated with oil or grease, clean the coils with a mild
detergent-and-water-solution. Rinse coils with clear water, using a
garden hose. Be careful not to splash water on motors, insulatiom
wiring or air lilter(s). For best results, spray condenser-coil fins
from inside to outside the unit. On units with an outer and inner
condenser coil be stare to 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 li"om the pan. Flush the pan and drain tube with
clear water. Do not splash water on the insulation, motor_ wiring,
or air filter(s), If the drain tube is restricted, clear it with a
"phnnbers snake" or similar probe device. Ensure that the
auxiliary drain port above the drain robe is also clear.
16

Unit
036
042
048
O6Ot
2 Speed
060
3 Speed
Table 4--Dry Coil Air Delivery* Horizontal Discharge
(Deduct 10 percent for 208 Volt Operation)
Motor Speed
Low
Med
High
Low
Med
High
Low
Med
Low
Med
High
Low
Med
High
230 AND 460 VOLT
External
Air Delivery 0.1 0.2 0.3 0.4
Watts 480 435 420 400
Cfm 1231 1218 1204 1120
Watts 470 480 445 410
Cfm 1302 1264 1205 1163
Watts 660 635 610 875
Cfm 1700 1660 1581 1450
Watts 478 488 440 411
Cfm 1303 1270 1224 1179
Watts 481 468 480 438
Cfm 1310 1280 1241 1181
Watts 798 678 647
Cfm 1736 1688 1618
Watts 801 760
Cfm 1898 1841
Watts 870 842
Cfm 2000 1903
Watts 890 880 810 790
Cfm 1834 1820 1791 1762
Watts 1040 1018 1000 950
Cfm 2230 2102 2025 1960
Watts 1073 1038 1001 958
Cfm 2230 2202 2160 2122
Watts 1058 1008 942 891
Cfm 2384 2200 2197 2071
Watts 1266 1086 1021 1002
Cfm 2724 2476 2392 2344
Watts 1301 1216 1197 1127
Cfm 2760 2618 2543 2423
Static Pressure (in. wg)
0.5 0.6 0.7 0.8
380 338 326 311
1008 950 863 751
388 359 338 321
1081 940 873 783
540 505 485 460
1297 1190 1095 999
378 350 327 317
1126 1022 911 816
404 370 338 320
1110 1022 943 811
618 578 540 500
1510 1421 1309 1187
730 688 650 600
1757 1682 1564 1429
818 782 696 632
1799 1718 1625 1446
735 680 580 480
1703 1640 1415 1159
890 835 790 650
1901 1855 1752 1468
896 840 800 691
2052 1926 1791 1588
860 828 750 700
1989 1889 1820 1729
977 924 860 819
2262 2132 2001 1910
1058 1011 979 869
2292 2169 2056 1943
0.9
735
1060
570
1365
628
1333
422
950
58O
1121
575
1202
630
1640
700
1820
870
1832
Table 5--Wet Coil Pressure Drop
UNIT SIZE
5OZP
036
042
048
060
AIRFLOW
(CFM)
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1800
2100
2300
PRESSURE DROP
(IN. WG)
0.07
0.09
0.11
0.12
0.04
0.06
0.08
0.09
0.07
0.08
0.09
0.07
0.08
0.09
0.10
Step 5--Condenser Fan
Keep the condenser fan free li"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.
Table 6--Filter Pressure Drop (in. wg)
UNIT FILTER CFM
SIZE SIZE
50ZP (IN.) 500 600 700 800 900 1000 1100 1200 1300 J1400
036-042 24 x 24 0.06 0.07 0.08 0.08 0.09 0.09 0.09 0.10 0.11 0.12
048,060 24 x 30 0.08 0.09
UNIT FILTER CFM
SIZE SIZE
5OZP (IN.) 1500 1600 1700 1800 1900 2000 2100 2200 2300
036-042 24 x 24 0.14 0.15
048,060 24 x 30 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
Table 7--Accessory Electric Heat Pressure Drop
(in. wg)
I CFM
HEATER5.20KW_600 800 1000 1200 1400 1600 1800 2000 22000.25
2. Remove condenser-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. 21.
5. Tighten setscrews.
17

6.Replacecondenser-fanassembly.
Step 6--Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
.sur(, to furlz (_'tlle electrical power to the unit.
Remove the top panel to locate all the electrical controls and
wiring. Check all electrical connections lor 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.
3.125 in.
C00021
Fig. 21--Condenser-Fan Adjustment
After 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 iX'a suspected malfunction has occurred, check
each electrical component with the proper electrical instrnmenta-
tion. Reli:r to the unit wiring label when making these checkouts.
NOTE: Reli:r to the Sequence of Operation section as an aid in
deterndning proper control operation. (See Table of Contents Iiw
page number. )
Step 7--Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base Iiw oil
accumulations annually. Detecting oil generally indicates a refi'ig-
erant leak.
If oil is detected or if low cooling perli_rmance is suspected,
leak-test all refi"igerant robing using an electronic leak-detector, or
liquid-soap solution. Ira reli"igerant leak is detected, relierto Check
fiw Refi"igerant Leaks section. (See Table of Contents li)r page
nun'_ber.)
If no refrigerant leaks are limnd and low cooling perfkwmance is
suspected, reli:r to Reli"igerant Charge. (See Table of Contents lor
page nnmber.)
Step 8--Evaporator Airflow
The cooling airflow does not require checking unless in,proper
perlkwmance is suspected. !_J"uproblem ('xL_t_, be m_r(, that cHl
SUl_plv-cmd returll-_tir grille,s are ol)ell ut_d_)'('e.f}'omol)structiot*,s,
und theft the c_ir,_i'lteris clecm. When necessary, reler to Indoor
Airflow and AirlIow Adjustments section to check the system
airflow. (See Table of Contents fkw page number.)
Step 9--1Vletering Devices
Rel)'igerant metering devices are fixed orifices and are located in
the inlet header to the evaporator coil.
Step lO--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.
18

SYMPTOM
Compressor and condenser fan will not start.
Compressor will not start but condenser fan
runs.
TabJe 8--TroubJeshooting--CooJing
CAUSE
Power Failure
Fuse blown or circuit breaker tripped
Defective thermostat, contractor, transformer, or
control relay
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Faulty wiring or loose connections in compressor
circuit
Compressor motor burned out, seized, or internal
overload open
Defective run/start capacitor, overload, start relay
One leg of 3-phase power dead
Compressor cycles (other than normally satisfying thermostat).
Compressor operates continuously.
Excessive head pressure.
Head pressure too low.
Excessive suction pressure.
Suction pressure too low.
Refrigerant overcharge or undercharge
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, overload or start
relay
Defective thermostat
Faulty condenser-fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low refrigerant charge
Leaking valves in compressor
Air in system
Condenser coil dirty or restricted
Dirty air filter
Dirty condenser coil
Refrigerant overcharged
Air in system
Condenser air restricted or air short-cycling
Low refrigerant charge
Compressor valves leaking
Restriction in liquid tube
High heat load
Compressor valves leaking
Refrigerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Temperature too low in conditioned area
Outdoor ambient below 40°F
Field-installed filter-drier restricted
REMEDY
Call power company
Replace fuse or reset circuit breaker
Replace component
Determine cause and correct
Check wiring diagram and rewire correctly
Lower thermostat setting below room tempera-
ture
Check wiring and repair or replace
Determine cause
Replace compressor
Determine cause and replace
Replace fuse or reset circuit breaker
Determine cause
Recover refrigerant, evacuate system, and re-
charge to capacities shown on nameplate
Replace and determine cause
Determine cause and correct
Determine cause and correct
Determine cause and replace
Replace thermostat
Replace
Locate restriction and remove
Replace filter
Decrease load or increase unit size
Reset thermostat
Locate leak repair, and recharge
Replace compressor
Recover refrigerant, evacuate system, and re-
charge
Clean coil or remove restriction
Replace filter
Clean coil
Recover excess refrigerant
Recover refrigerant evacuate system, and re-
charge
Determine cause and correct
Check for leaks, repair and recharge
Replace compressor
Remove restriction
Check for source and eliminate
Replace compressor
Recover excess refrigerant
Replace Filter
Check for leaks, repair, and recharge
Remove source of restriction
Increase air quantity
Check filter- replace if necessary
Reset thermostat
Install low-ambient kit
Replace
19

START-UP CHECKLIST
(REMOVE AND STORE IN JOB FILE)
I. PRELiMiNARY iNFORMATiON
Model No .............................................................................................................................................................
Serial No ..............................................................................................................................................................
Date ......................................................................................................................................................................
Technician ...........................................................................................................................................................
II, PRE-START-UP
Verify that all packing materials have been removed from unit
Verify that condensate connection is installed per installation instructions
Check all electrical connections and terminals for tightness
Check that indoor (evaporator) air filter is clean and in place
Verify that unit installation is level
__ Check fan wheel propeller for location in housing and setscrew tightness
ill, START-UP
Supply Voltage: L1-L2 _ L2-L3 L3-L1
Compressor Amps: L1 L2 L3
Indoor (Evaporator) Fan Amps:
TEMPERATURE
Outdoor (Condenser) Air Temperature: _ DB
Return-Air Temperature: DB WB
Cooling Supply Air: DB WB
PRESSURES
Refrigerant Suction psig
Refrigerant Discharge psig Suction Line Temp*
Discharge Temp?
Verify Refrigerant charge using charging tables
Verify that 3-phase scroll compressor (50GL030-060) is rotating in correct direction.
*Measured at suction inlet to compressor
?Measured at liquid line leaving condenser
Copyright 2006 CARRIER Corp. * 7310 W. Morris St. • Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
B°°kLL__ PC 101 Printed in U.S.A. Catalog No. 50ZP-5SI Pg 20 2-06 Replaces: New
Tab 16al 8a