Carrier 48KHA User Manual
48KHA,KLA
Packaged Heating/Cooling Units
Installation, Start-Up and Service Instructions
NOTE TO INSTALLER: After installation, leave these instructions, Owner’s Manual and Peurts Replace
ment Guide with equipment owner.
CONTENTS
Page
SAFETY CONSIDERATIONS
GENERAL..........................................................................1,2
INSTALLATION
Step 1—Rig and Place Unit..............................................2-4
.................................................................
...............................................
1
2-8
• ROOFTOP INSTALLATION
• GROUND LEVEL INSTALLATION
• CLEARANCES
• CONDENSATE DISPOSAL
• VENTING
Step 2—Make Gas Piping Connections
Step 3—Make Duct Connections........................................6
Step 4—Make Wiring Connections
..........................
.................................
5,6
6,7
• HIGH-VOLTAGE CONNECTIONS
• SPECIAL PROCEDURES FOR
208-V OPERATION
• LOW-VOLTAGE CONNECTIONS
• HEAT ANTICIPATOR SETTING
START-UP........................................................................9-16
SERVICE........................................................................16-19
TROUBLESHOOTING CHARTS
SAFETY CONSIDERATIONS
...................................
20,21
A WARNING
Improper installation, adjustment, eJteration, service,
maintenance or use can cause carbon monoxide poison
ing, explosion, fire, electric shock or other occurrences
which may injure you or damage your property. Con
sult a qualified instedler, service agency or the gas sup
plier for information or assistance.
NOTE: Installation of this unit must conform to the guide
lines presented in these Installation Instructions. Read and
become familiar with this publication before starting
installation.
Only trained, qualified installers and service mechanics
should install, start-up and service this equipment. Consult
the User’s Manual for routine maintenance. All other opera
tions should be performed by tredned service personnel,
personnel.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging and setting bulky equip
ment.
• Observe precautions in these instructions and on equip
ment tags, stickers and labels.
* •
A WARNING
Do not disconnect electric power to this appliance with
out first turning off gas supply. Be sure power to equip
ment is shut off before meuntenance or service.
Fig. 1—Model 48KHA,KLA
GENERAL
Models 48KHA,KLA packaged gas/electric units (Fig. 1) eire
design certified in accordance with ANSI Z21.47B-1986,
ARI Standeird 210-81 and ARI Stemdard 270-84. The units
are design certified by the American Gas Association
(AGA) for use with natural or propane gases with appropri
ate controls or orifices. See Table 1 for heating input rat
ings. Models 48KHA,KLA units are fully self-contedned,
combination gas-heating/electric-cooling units designed for
outdoor installation on either a rooftop or ground-level slab.
May be instedled directly on wood flooring or on Class A,
Class B or Class C roof covering materials.
These units are equipped with an energy-saving automatic,
intermittent, electric spark ignition system that does not
have a continuously burning pilot. All units are manufac
tured with natural gas controls.
Units with number 1 in the 4th digit location of model num
ber in Table 1 meet California oxides of nitrogen (NOx) max
imum emission requirements.
Units are factory charged with R-22 refrigerant. To install:
connect gas supply, air ducts, high- and low-voltage wiring
and condensate drain, and install a field-supplied air filter in
the return-air ductwork.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
BookI 1 I 4 PC 101 Cataiog No 534-862 Printed in USA Form 48KH,KL-19Si Pg 1 1-88 Replaces: 48KH,KL-17SI
Tab ila 11a For replacement items contact distributor.
Table 1—Performance Data
COOLING
MODEL 48-
KLA118310BE
KLA124310BE
KHA024310BF
KLA130310BE
KHA030310BF
KLA136310BE
KLA136510CE
KLA136610CE
KHA136310BE
KHA136S10CE
KHA036310BF
KHA036510CF
KLA142310BE
KLA142510CE
KHA042310BF
KHA042510CF
KLA148310BE
KLA148510CE
KLA148610CE
KHA048310BE
KHA048510CF
KLA160310BE
KHA060310BF
♦Rated in accordance with U S. Government D.O.E. test procedures and/
or ARI Standard 210-81.
tSound rating per ARi 270-84.
tThe capacity ratings of singie-phase units are in accordance with U.S.
Government D.O.E. test procedures and/or AGA certification require
ments. For 3-phase units, the efficiency rating is a product thermai effi
ciency rating determined under continuous operating conditions, inde
pendent of any installed system.
CAPACITY
(Btuh)*
17,800 40,000 32,000
23,800 40,000
24,000 75,000
29,600
29,600 75,000 58,000
36,000 60,000
36,000
36,000 60,000
36,000
36,000
36,000
36,000
42,000 60,000
42,000 60,000
42,000
42,000 125,000
49,000
49,000
49,000
49,000
49,000
60,000
60,000
RATED
HEATING
INPUT
(Btuh)
40,000 32,000
60,000
100,000 79,000
100,000 75,000
125,000
125,000
125,000 97,000
80,000 63,000
80,000 60,000
80,000 60,000
125,000 97,000
125,000 93,750 8.4*
100,000* 79,000* 8.4*
150,000* 116,000* 8.4*
OUTPUT
CAPACITY
(Btuh)
32,000
58,000
47,000
45,000
45,000
97,000
93,750
47,000
45,000
93,750
ARI*
SOUND
RATING
(Bels)
7.8
7.8
8.0
7.8
7.8
8.0
8.0
8.0
8.0
8.0
8.0
8.0
78
7.8
7.8
7.8
8.4*
8.4*
8.4*
8.4*
SPREADER OARS' ^
(2)2x4xUNIT LENGTH PLUS 10"WITH
11 DEEP 90° NOTCHES EACH END
(2) 2x4xUNIT WIDTH WITH l^
DEEP 90° NOTCHES
EACH END
LOCATE CHAINS THROUGH
HOLES IN BASE
CHANNELS
Fig. 2—48KHA,KLA Suggested Rigging
INSTALLATiON
Step 1—Rig and Place Unit
A CAUTION
SPREADER BARS
TWO OR THREE BASE
CHANNELS ATTACHED TO
BOTTOM OF UNIT
CHAIN
All units can be connected into existing duct systems that
are properly sized and designed to handle an airflow of 350
to 450 cfm per each 12,000 Btuh of rated cooling capacity.
See Table 8 for cooling euid heating airflow requirements.
NOTE: When insteJling any accessory item, see Installation
Instructions packaged with accessory.
IMPORTANT-
READ BEFORE INSTALLING
1. This instEdlation must conform with all applicable
local and nationed codes.
2. Power supply (volts, hertz and phase) must corre
spond to that specified on unit rating plate.
3. Electrical supply provided by utility must be suffi
cient to handle load imposed by unit.
4. Refer to Fig. 4 for locations of gas inlet, electrical
inlets, condensate drain, duct connections, and
required clearances before setting unit in place.
5. Locate unit where vent cap will be a minimum of 4 ft
from openable windows or doors.
6. Installation must conform with local building codes
and with National Fuel Gas Code, NFPA 54-1984/
ANSI Z223.1-1984.
IMPORTANT: On some models, the high-voltage igni
tion cable is not connected to the spark generator termi
nal on the control head/gas valve assembly when shipped
from the factory. The cable is fastened to the manifold on
these models. Push the boot toward center of the cable to
expose the connector on the end of the cable. Attach the
connector securely to the terminal on the end of the con
trol head/gas vedve assembly. Push the boot over connec
tor to insulate the high-voltage connection.
When rigging unit to be hfted, use spreader bars to pro
tect top and sides. Rig unit as shown in Fig. 2. Use
extreme caution to prevent damage when moving unit.
Unit must remain in upright position during all rigging
and moving operations. Unit must be level for proper
condensate drainage; therefore, the ground-level pad or
accessory roof-mounting curb must be level before set
ting unit in place. When a field-fabricated support is
used, ensure that support is level and properly supports
unit and plenum.
ROOFTOP INSTALLATION
A CAUTION
When installing a unit on a rooftop, be sure roof will
support the additioneil weight. Refer to Fig. 4 to obtain
total weight and corner weight information.
When installing a Model 48KHA,KLA end discharge unit
with a field-supplied downflow plenum, a field-supplied roof
mounting curb must be installed on emd flashed into roof
before unit installation. When installing a Model
48KHA,KLA end discharge unit without a downflow ple
num, place unit on a level base that provides proper sup
port. On flat roofs be sure unit is located at least 4 in. above
highest expected water level on roof to prevent flooding.
Consult local codes for additional installation requirements.
GROUND LEVEL INSTALLATION-Place unit on a
solid, level concrete pad that is a minimum of 4 in. thick and
that extends approximately 2 in. beyond casing on all sides
of unit. Do not secure unit to pad except when required by
local codes.
CLEARANCES—Required minimum operating and service
clearances are shown in Fig. 4 for providing adequate com
bustion, ventilation emd condenser edr.
A CAUTION
Do not restrict condenser airflow. An air restriction at
either outdoor-edr inlet (the entire surface of the outdoor
coil) or fan discharge can be detrimental to compressor
life.
Condenser fan discharges through top of unit. Ensure that
fan discharge does not recirculate to condenser coil. Do not
locate unit in either a corner or under a complete overhead
obstruction. Minimum clearance under a partial overhang
(such as a typical house roof overhang) is 3 ft above vent
cap. Maximum horizontal extension of a partial overhang
must not exceed 4 feet.
Do not locate unit where water, falling ice or snow from an
overhang or roof will damage or flood the unit. Do not locate
unit where grass, shrubs, or other plants will interfere with
the airflow either into or out of unit. Do not install unit on
carpeting, tile or other combustible material other than
wood flooring.
CONDENSATE DISPOSAL
NOTE: Be sure condensate water disposed methods comply
with local codes, restrictions and practices.
Models 48KHA,KLA dispose of condensate water through
a %-in. MPT drain fitting. See Fig. 4 for location.
Install a 3-in. trap at the drain fitting to ensure proper
drainage. See Fig. 3. Make sure trap outlet is at least 2 in.
lower than unit dredn pan connection to prevent pan from
overflowing. Prime trap with water.
TO DRAIN
Fig. 3—Condensate Trap
If installation requires draining the condensate water away
from unit, connect a dredn tube using a minimum of 7s-in. OD
copper tubing, %-in. galvanized pipe or 7s-in. plastic pipe. Do
not undersize the tube. Pitch drain tube downward at a
slope at least one in. for every 10 ft of horizontal run. Be
sure to check drain tube for leaks.
Condensate water can be drained directly onto roof in roof
top installations (where permitted) or onto a gravel apron in
ground level installations. When using a gravel apron, make
sure it slopes away from the unit.
VENTING—The vent cap, combustion air shroud and flue
assembly are shipped in either the blower or control com
partment. Vent screen is taped to blower housing. Remove
access doors to locate assemblies. See Fig. 4 for door
locations.
A CAUTION
Venting system is designed to ensure proper venting.
Vent cap assembly must be installed as indicated
below.
NOTE: Screw holes in flue assembly and unit top eire posi
tioned to ensure proper orientation when installed. Refer to
Fig. 5 emd instedl vent cap as follows:
1. Place combustion air shroud over combustion air open
ing in unit top, and line up screw holes in shroud with
holes in top. Secure shroud to top, using screws with
rubber washers (provided).
2. The flue gasket is shipped in the literature assembly
envelope. Place gasket and flue assembly through hole
in combustion air shroud, orient screw holes in base of
flue assembly with holes in unit top, and secure gasket
and flue assembly to unit top, using screws provided.
3. Form flat wire screen (provided) into circular shape
around protruding lip of combustion-air shroud and
bend wire ends through holes of screen mesh to secure
screen in place. Make sure that no sharp edges are left
exposed.
4. Place vent cap sleeve inside flue assembly. Orient
spring chp of vent cap with slot in assembly. Be sure
clip snaps into slot to secure clip onto assembly.
i MPT / U-—G
DRAIN CONN
PLUGGED ACCESS HOLE
FOR REFRIGERANT
PRESSURE GAGE HOSES
*NOTON MODELS48KLAII8THROUGH
I36i KHA024 THROUGH 030
CONTROL ACCESS
DOOR
BLOWER ACCESS
DOOR
I LOW VOLTAGE
INLET
K HIGH VOLTAGE
INLET
T-4Í
C> EVAPORATION AIRFLOW
^CONDENSER AIRFLOW
VENT CAP
COMBUSTION AIR INLET BOX
■NOT ON MODELS
48KLAII8 THROUGH 136;
KHA024 THROUGH 030
MODEL 48-
Dimensions
(ft-in.)
A
B
C
D
E
F
G
H
J
K
L
M
N
MODEL
48-
KLA118 82
KLA124
KHA024
KLA130
KHA030 97
KLA136
KHA136 122
KHA036
KLA142
KHA042
KLA148 130 135 137
KHA048 134 139 144
KLA160
KHA060
KLA118
KLA124
4-5% 4-5% 5-5%
2-6% 3-4% 3-8%
3-2'/a
1-4 1-7 2-0
1-4 1-4
0-7'/4
0-11% 0-10% 0-10%
1-3’A
—
0-1 %2 0-1% 0-1% 0-1%
0-1%
0-47,6
1-10 2-4 2-4
CORNER WT (ib)
A B
83 81
96 94
97 93
98 97 92
122 120 116 117 475 485
108 105 102
113 111 107
148 144 139
155 151
C D
79
93 91 94 375 385
120 116 117
148 151 605
KHA024
KLA130
KHA030
KLA136
3-57s 3-107e
0-8?8
1-374 1-874
—
0-17e
0-67,6
79 81 320 330
82
79
91 94 375 385
90 92 372 382
93 380
105 420
109 440
133 535
138 555
144 575
KHA136
KHA036
KLA142
KHA042
1-174
0-8%
1-1 O'732
1-4
0-87,6 0-87,6
TOTAL
OPERATiNG
WT (ib)
325 335
475
KLA148
KHA048
KLA160
KHA060
6-0%
3-8%
4-6%
2-8
1-174
0-8%
0-11%
1-8%
2-0=»/32
1-5
2-4
TOTAL
SHiPPING
WT (ib)
390
485
430
450
545
565
585
615
Above flue vent........................................................................................................3-0
Duct side of unit .....................................................................................................0-6
Side opposite ducts................................................................................................2-6
Biower access panel side.
Side opposite biower access panel.
Bottom of unit.................................................
NOTE: Provision must be made for fresh ambient air to reach the
outdoor coil without recirculation of the air from the outdoor fan
discharge
Weight Data
VIEW AA
CLEARANCES (ft-in.)
2-6
2-6
0
Fig. 4—Dimensions and Ciearances (ft-in.)
Fig. 5—Vent Cap Assembly
COMBUSTION-AIR SHROUD
CONTROL
TRANSFORMER
COMPRESSOR
CONTACTOR
GAS INLET
PRESSURE TAP
(BACK SIDE)
‘GAS PIPE
ENTRANCE HOLE
REGULATOR
LOW VOLTAGE SECONDARY p. pf'TpoNIC \
WIRES air SHIELD ^^)n7rOL GAS VALVE
HEAD
ADJUSTING SCREW
Fig. 6—Model 48KLA136—Side View
(Partiai) with Access Doors Removed
2. Protect all segments of piping system against physiceJ
and thermal deimage. Support all piping with appropri
ate hangers, etc. Use a minimum of one hanger in every
6 feet. For pipe sizes larger them V2-in., follow recom
mendations of national codes.
Apply joint compound (pipe dope) speiringly and only
3.
to male threads of joint when meiking pipe connections.
Use only pipe dope that is resistant to action of lique
fied petroleum gases as specified by local and/or
nationeJ codes. Never use pipe thread tape.
InsteJl a sediment trap in riser leading to the heating
4.
section. See Fig. 7. This drip leg functions as a trap for
dirt and condensate. Install trap where condensate can
not freeze. Install this sediment trap by connecting a
piping tee to riser leading to heating section, so that
straight-through section of tee is vertical. Then, con
nect capped nipple into lower end of tee. Extend
capped nipple below level of gas controls.
Step 2—Make Gas Piping Connections—A manual shutoff
vedve is shipped loose in the burner compartment or blower
compartment. Connect one end of a field-supplied V2-in.
streught nipple to the gas valve inlet. Connect the other end
of the nipple to the manual shutoff valve as shown in Pig. 6.
The gas supply pipe enters unit through access hole pro
vided. See Fig. 4 for location. The gas connection to unit is
made to the V2-in. FPT gas inlet on manual shutoff. See Fig.
6 for inlet location.
Install a separate gas supply line that runs directly from
meter to heating section. Do not use cast-iron pipe. Check
local utility for recommendations concerning existing lines.
Choose a supply pipe that is large enough to keep pressure
loss as low as practical. Never use pipe smaller than the ^¡¿-in.
FPT gas inlet on unit manual shutoff.
When installing gas supply line, observe local codes pertain
ing to gas pipe installations. Refer to National Fuel Gas
Code, NFPA 54-1984/ANSI Z223.1-1984 in absence of local
building codes. Adhere to following pertinent recom
mendations:
1. Avoid low spots in long runs of pipe. Grade all pipe %-
in. in every 15 ft to prevent traps. Grade all horizonteJ
runs downward to risers. Use risers to connect to heat
ing section and to meter.
Fig. 7—Sediment Trap
5. Install an accessible, external, manual shutoff valve in
gas supply pipe within 6 ft of heating section.
NOTE: The unit manual shutoff valve has a Vs-in. tap
ping on the inlet side of this shutoff for measuring gas
input pressure.
6. Install ground-joint union close to heating section
between unit manual shutoff and external manual main
shutoff valve.
7. Pressure-test all gas piping in accordance with loceil
and national plumbing and gas codes before connecting
piping to unit.
NOTE: When pressure-testing the gas supply system
after the gas supply piping has been connected to the
unit gas valve, the supply piping must be disconnected
from the gas valve during any pressure testing of the
piping systems at test pressures in excess of 0.5 in.
psig. When pressure testing the gas supply piping sys
tem at test pressures equal to or less than 0.5 in. psig,
the unit heating section must be isolated from the gas
piping system by closing the external main manual
shutoff valve and slightly opening ground-joint union.
A CAUTION
Unstable operation may occur, peirticularly under highwind conditions, when gas valve and manifold assembly
are forced out of position while connecting improperly
routed, rigid gas piping to gas valve. Use a backup
wrench when making connection to avoid strain on, or
distortion of, gas control piping.
2. Use a flexible transition between rigid ductwork and
unit to prevent transmissions of vibration. The transi
tion may be screwed or bolted to duct flanges. Use suit
able gaskets to ensure a weathertight and air-tight
seal.
3. Install external, field-supplied air filter(s) in return-air
ductwork where it is easily accessible for service. Rec
ommended filter sizes are shown in Table 2.
4. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid
abrupt duct size increases or decreases.
5. Adequately insulate and weatherproof all ductwork
located outdoors. Insulate ducts passing through an
unconditioned space, and use a vapor barrier in accord
ance with the latest issue of SMACNA and NE SC A
minimum installation standards for heating and air
conditioning systems. Secure all ducts to building
structure.
6. Flash, weatherproof and vibration-isolate all openings
in building structure in accordance with local codes and
good building practices.
8. Where permitted by local codes, use an approved corru
gated metal tubing gas connector between rigid gas
piping and unit manual shutoff.
A WARNING
Never use a match or other open flame when checking
for leaks. Failure to adhere to this warning may cause
an explosion.
9. Check for gas leeiks at eJl field-installed and factoryinstalled gas lines after all piping connections have
been completed. Use soap-and-water solution (or
method specified by local codes and/or regulations).
Step 3—Make Duct Connections—Model 48KHA,KLA
has duct flanges on the supply- and return-air openings on
side of unit. See Fig. 4 for connection sizes and locations.
A WARNING
The design and installation of duct system must be in
accordance with standards of National Fire Protection
Association for installation of non-residence type air
conditioning and ventilating systems. NFPA No. 90; or
residence-type NFPA No. 90B; and/or local codes and
ordinances.
Table 2—Filter Sizes (Field Supplied),
(Sq In.)*
MODEL 48-
KLA118310BE
KHA024310BF
KLA124310BE
KHA030310BF
KLA130310BE
KHA036310BF
KHA136510CE
KHA036510CF
KHA136310BE
KLA136510CE
KLA136610CE
KLA136310BE
KHA042310BF 694
KHA042510CF 694
KLA142510CE
KLA142310BE 672
KHA048310BF 768
KHA048510CF 768
KLA148510CE 768
KLA148610CE
KLA148310BE
KHA060310BF 960
KLA160310BE 960
*Required air filter areas shown are based on the ARI-rated cooling air
flow or the heating airflow at a velocity of 300 fpm depending on
whichever value is larger. Air filter pressure drop should not exceed 0 08
, in wg
STANDARD CLEANABLEOR
DISPOSABLE HIGH CAPACITY
TYPE
302 202
454
384 257
480 320
480 320
694
576
694
576
576
576 384
576 384
672
768 512
768 512
TYPE
303
462
384
462
384
384
462
462
448
448
512
512
512
640
640
Step 4—Make Wiring Connections
Adhere to the following requirements when selecting, sizing
tmd installing duct system;
1. Select and size ductwork, supply-air registers and
return-£ur grilles according to ASHRAE recommenda
tions emd as presented in Carrier System Design Man
ual, Part 2.
A CAUTION
When duct system fastening holes are drilled into side
of Model 48KHA,KLA instead of the unit duct flanges,
use extreme care to avoid puncturing coil or coil tubes.
A WARNING
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personeil
injury if an electrical fault should occur. This ground
may consist of electrical wire connected to unit ground
lug in control compartment, or conduit approved for
electrical ground when installed in accordance with
National Electrical Code ANSI/NFPA 70-1984 and
local electriced codes. Do not use gas piping as an elec
trical ground. Failure to follow this warning could
result in the installer being held liable for personal
injury of others.
A CAUTION
Feiilure to follow these precautions could result in dam
age to unit being installed.
1. Make all electrical connections in accordance with
National Electrical Code ANSI/NFPA 70-1984 and
local electrical codes governing such wiring.
2. Use only copper conductor for connections between the
field-supplied electrical disconnect switch and the unit.
Do not use aluminum or copper-clad aluminum wire.
3. Ensure that high-voltage power to unit is within oper
ating voltage range indicated on unit rating plate. On
3-phase units, ensure that phases are balanced within
2%. Consult local power company for correction of
improper voltage and/or phase balance.
4. When low-voltage control wires are run in same conduit
as high-voltage wires, insulate low-voltage wires for
highest voltage contained within conduit.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, con
duit, etc.
HIGH-VOLTAGE CONNECTIONS-Unit must have a
sepeirate electriceil service with a field-supplied, waterproof,
fused disconnect switch per NEC mounted near, and within
sight from, the unit. Refer to unit rating plate for maximum
fuse size and minimum circuit amps (ampacity) for wire siz
ing. Table 3 shows recommended wire sizes and lengths
based on rating plate data.
The field-supplied disconnect switch box may be mounted
on unit over the high-voltage inlet hole in control corner
pemel. See Fig. 4.
A WARNING
Label Part No. A74191B, which is shipped loose in bag
of parts, must be affixed to the disconnect switch box.
This label states: "DO NOT DISCONNECT THE
ELECTRICAL POWER TO THIS APPLIANCE
WITHOUT FIRST TURNING OFF THE GAS
SUPPLY.”
Proceed as follows to complete the high-voltage connections
to unit:
1. Connect ground lead to chassis ground connection
when using a separate ground wire.
2. Run high-voltage leads into unit control box and con
nect to contactor. See unit wiring label and Fig. 6
and 8.
NOTE; On 3-phase units, connect third high-voltage lead to
brown high-voltage pigtail lead. See unit wiring label and
Fig. 8.
SPECIAL PROCEDURES FOR 208-V OPERATION
A WARNING
Make sure power supply to unit is switched OFF before
making any wiring changes. Electrical power may cause
personal injury or death.
For operation on 208 volts, disconnect orange transformer
primary lead from contactor. See unit wiring label and
Fig. 6. Remove tape emd cover from terminal on end of red
transformer-primary lead. Save cover. Connect red lead to
contactor terminal from which orange lead was dis
connected.
Using cover removed from red lead, insulate loose terminal
on orange lead. Wrap cover with electricEd tape so that
metal terminal cannot be seen.
NOTE: For some 48KHA,KLA units, the factory-wired
blower-motor speed connections may require changing for
208-v operation to ensure adequate airflow at the rated
external static pressure. See unit wiring label. Insulate all
unused motor leads following same procedures described for
tremsformer leads.
LOW-VOLTAGE CONNECTIONS-Use a suitable room
thermostat as specified on unit wiring label.
Locate room thermostat on an inside wall in space to be con
ditioned where it will not be subjected to either a cooling or
heating source, or direct exposure to sunlight. Mount ther
mostat 4 to 5 ft above floor.
Use no. 18 AWG color-coded, insulated (35 C minimum)
v/ires to make low-voltage connections between thermostat
and unit. If thermostat is located more than 100 ft from
unit (as measured along the low-voltage wires), use no. 16
AWG color-coded, insulated (35 C minimum) wires.
A grommeted, low-voltage inlet hole is located in the panel
adjacent to control access panel. See Fig. 4. Run low-voltage
leads from thermostat, through inlet hole and to low-voltage
flagged pigtail leads that run through a hole in bottom of
unit control box. See Fig. 6. Connect thermostat leads to
pigtail leads as shown in Fig. 8
HEAT ANTICIPATOR SETTING—Room thermostat heat
anticipator must be properly adjusted to ensure proper
heating performance. Set heat anticipator, using ammeter
to determine exact required setting.
NOTE: For thermostat selection purposes, use 1.0 amps for
approximate required setting.
Failure to make a proper heat anticipator adjustment will
result in improper operation, discomfort to occupants of
conditioned space and inefficient energy use; however,
required setting may be changed slightly to provide a
greater degree of comfort for a particular installation.
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