Carrier 38HQ User Manual
Number One
Ai'rConditbninq
Maker
Divisiun uf
Carrier Corporation
Carrier Parkway • Syracuse NY 13221
Weathermaster III Heat Pump
(Outdoor Coil Section; Indoor Compressor Section)
INDEX
Page
SAFETY CONSIDERATIONS...............................1
INSTALLATION
...................................................
1-8
Step 1 — Check Equipment and
Jobsite...............................................I
• UNPACKAGE UNITS
• INSPECT EQUIPMENT
• COMPLETE OR CONSIDER SYSTEM
REQUIREMENTS
Step 2 — Mount Outdoor Coil Unit
....................
3
• ON THE GROUND: MOUNT OUTDOOR
COIL ON A SOLID, LEVEL CON
CRETE PAD
• ON THE ROOF: MOUNT OUTDOOR
COIL ON A LEVEL PLATFORM
OR FRAME
Step3 — Mount Indoor Compressor
Section
Step 4 — Make Piping Connections
.............................................
..................
5
5
• REPLACE THE ACCURATER™ RE
FRIGERANT CONTROL PISTON IN
THE INDOOR COIL AS REQUIRED
• CONNECT REFRIGERANT LINES
Step 5 — Make Electrical Connections .. 7
• INSTALL A BRANCH CIRCUIT
DISCONNECT PER NEC
• BRING LINE POWER LEADS INTO
COMPRESSOR SECTION
• CONNECT GROUND LEADS AND i
POWER WIRING
• CONNECT POWER LEADS FROM
INDOOR COMPRESSOR SECTION
TO OUTDOOR COIL
• SEE INDOOR FAN COIL AND
ELECTRIC HEATER INSTALLATION,
START-UP AND SERVICE
INSTRUCTIONS
• CONNECT CONTROL POWER
WIRING
START-UP
...........................................................
8, 9
SERVICE............................................................10-17
MAINTENANCE ................................................. 17
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning
equipment can be hazardous due to system pressure
and electrical components. Only trained and quali
fied service personnel should install, repair or
service air conditioning equipment.
Untrained personnel can perform basic mainten
ance functions of cleaning coils and filters and
replacing filters. All other operations should be
performed by trained service personnel. When
working on air conditioning equipment, observe
precautions in the literature, tags and labels
attached to the unit and other safety precautions
that may apply.
Follow all safety codes. Wear safety glasses and
work gloves. Use quenching cloth for brazing and
unbrazing operations. Have fire extinguisher avail
able for all brazing operations.
WARiNIMG: Before peri'orBEiisg: service or
laaintenaac« operadotis os. mtHL tiina oif rtsian
pow«f switch to ctait, T om OB' accessosy heater
power iwlich, if ap-ptlrcaiBe, Ekofticai shock
coold muse personal
INSTALLATION
Step 1 — Check Equipment and Jobsite
UNPACKAGE UNITS — Move to final location.
Slide from cartons taking special care not to damage
service valves. Compatible Fittings or grilles.
INSPECT EQUIPMENT — File claim with ship
ping company if shipment is damaged or
incomplete.
COMPLETE OR CONSIDER SYSTEM RE
QUIREMENTS before installing the 38HQ:
Consult local building codes and National
Electrical Code (NEC) for special installation
requirements.
When installing, allow sufficient space for airflow
clearance (outdoor unit), wiring, refrigerant piping
and servicing unit. Position outdoor unit so water or
ice from roof cannot drop directly on top of unit.
Maximum allowable vertical distance between
indoor and outdoor sections is 50 feet. It is strongly
recommended that 38HQ units be used with Carrier
approved indoor sections. See Table 3.
© Carrier Corporation 1981
Form 38HQ-10SI
4-0" OVERHEAD SPACE REQUIRED
FOR SERVICE AND AIRFLOW
OUTDOOR
SECTION
i DIAM HOLE
LIQUID LINE
CONN
ik-If
MTG SLOTS
(USE ANY 2 TO
BOLT UNIT DOWN)
FOR CONTROL
WIRING
DRAINAGE HOLES
- If DIAM
HOLE FOR
POWER WIRING
SPACE REQUIRED FOR SERVICE E# AIRFLOW
Certified dimension drawings available on request
Fig. 1 —DimensionsandConnections(Tablel)
38HQ
COIL
,M HOLE (OR l|- KO)
FOR COMPRESSOR
mm SPACE REQUIRED
FOR SERVICE
Certified dimension drawings available on request
>Fig. 2 — DimensionsandConnections(Table2)
Table 1 — Installation Data (Outdoor Coil, Fig. 1)
UNIT 1 38HQ940 38HQ960
OPER WT (lb)
DIMENSIONS (ft-in.)
REFRIGERANT CONNECTION (in.)
Vapor* (ODF)
Liquid* (ODF)
‘Recommended field-supplied refrigerant line sizes shown under Table 2
Table 2 — Installation Data (Indoor Compressor Section, Fig. 2)
UNIT 38HQ120
OPERATING WEIGHT (lb)
DIMENSIONS (ft-in )
Length A
Width B
Height C
CONNECTIONS (in. ODF)
Vapor Lines (2)*
‘Recommended refrigerant line sizes
INDOOR COMPR
SECTION 38HQ
OUTDOOR
COIL 38HQ
VAPOR (in OD)
LIQUID (In OD)
120 127
940 940
! 3/4“
3/4
106 1 1 1
134 140
940
3/4 7/8 1-1/8
3/8
960
Diam A
Height C
38HQ127
146t
960t
i
125
■j 2-5-1/4 2-5-1/4
j 2-8
Compatible Fitting (Vapor) & Flare (Liquid)
3-8
. — .. —
3/8
38HQ134
38HQ140
117 141
1-2-3/32
1-4-3/16
1-11-1/8 (Add 2-1/2 in for Refrigerant Fittings)
Compatible Fittings (2)
3/4
->^tThe 38HQ146/38HQ960 system may use 7/8-in accessory^'
tubing package with slight capacity loss, see page 3 For 1-1/8 in (
system vapor line on 38HQ146, 3/4- x 1-1/8 in connection
adapter is available as accessory See Table 4
38HQ146
142
© 783
Table 3 ^ Carrier-Approved 38HQ Systems
INDOOR
COMPR
SECTION
120
127
134
140
146
^Change AccuRater Piston to No 46 in Outdoor Coil 38HQ940
when used in combination with Indoor Compressor Section
38HQ120
fWhen the system consists of 38HQ120 Compressor Section/
38HQ940 Outdoor Coil/ and 40AQ036 Indoor Fan Coil, the
factory-installed No 59 AccuRater piston must be removed from
the Outdoor Coil and installed in the Indoor Section As noted
above, a No 46 AccuRater piston is installed in the Outdoor Coil
38HQ
OUTDOOR
COIL
940*
940
940
960
960
INDOOR FAN COIL
L
f0AQ030
L
f0AQ036t
28HQ,VQ030t**
40FS160
— j 28HQ,VQ030**
— 28HQ,VQ036t*‘
40FS160 1 28HQ,VQ036
40FS160
40FS160
40FS200
40FS200
40FS220
28HQ,VQ036**
28HQ,VQ036
40AQ030t
40AQ036Ì
40DQ030
40AQ036
28HQ,VQ036**
28HQ,VQ036
28HQ,VQ042**
28HQ,VQ042
28HQ,VQ042
40QB042
28HQ,VQ048t**
28HQ,VQ048t
28HQ,VQ048
40QB048
INDOOR
ACCURATER™
PISTON PISTON
NO. NO.
59
63 59
70
76 63
82 63
for all 38HQ120 combinations Discard the AccuRater piston
which was factory installed in the Indoor Fan Coil
tindoor units that require replacement of AccuRater refrigerant
control piston for optimum performance when used with speci
fied 38HQ sections Required piston is shown in table and is
supplied with 38HQ compressor section for field installation
**Used in systems with non-specified indoor air moving unit
OUTDOOR
ACCURATER i
46
59
MAX HEIGHT (ft)
INDOOR UNITS
Above Below
Outdoor Coil
50 50
Outdoor Coil — Make provisions for condensate
drainage and defrost water disposal whether unit is
installed on ground, roof or off-the-wall platform.
(Ensure unit basepan drainage holes are not
blocked.) See Mount Outdoor Coil for details. Roof
installation method for 38HQ depends on building
construction and special requirements of local
codes. Make sure roof can support unit weight.
Indoor Compressor Section — Locate unit in base
ment, garage or utility room. Indoor locations
within the living space are not recommended. Base
ment installations also require careful planning to
avoid areas directly under bedrooms, living
rooms, etc.
Insert felt isolation pad (factory supplied) be
tween unit and a rigid mounting base to absorb
vibration. Isolate interconnecting tubing from
framing and ductwork or where tubing runs thru
stud spaces, enclosed ceilings or pipe chases. Use
isolation type hanger. Fig. 3, since rigid fastening
transmits pulsation to structure creating objection
able sound.
System Refrigerant Control on 38HQ units and
matching Carrier indoor fan coil units is a factory-
installed Accu-Rater™ device (bypass type). Bypasstype AccuRater components are shown in Fig. 26.
The AccuRater piston has a refrigerant metering
hole thru it, and is field replaceable. Table 3 indi
cates indoor units that require piston replacement
when used with specified 38HQ units. Replace
Fig. 3 — Refrigerant Line Hangers
piston as described under AccuRater Servicing
on page 16.
Step 2 — Mount Outdoor Coil
A heat pump rack for the outdoor section is avail
able as an accessory. See Fig. 5 and Table 4. This
rack is easily assembled in the field and predrilled
to accommodate the outdoor coil (as described in
the Installation Instructions enclosed with the rack).
An alternate method of installing the outdoor sec
tion is described in the following paragraphs.
ON THE GROUND; MOUNT OUTDOOR COIL
ON A SOLID, LEVEL CONCRETE PAD. See
Fig. 4 for pad dimensions. Position unit so that
coil drainage holes in basepan overhang the pad.
(See Fig. 1 for drainage hole location.) See that pad
does not obstruct drainage holes (holes drain water
during heating and defrost cycles). Attach unit to
pad with 1/4-in. mounting bolts. Position tiedown
bolts in pad. Any 2 holes in unit basepan may be
used to fasten unit to pad.
Construct round, 23-in. diameter pad a mihimum
of 6 in. above grade to provide clearance under holes
for drainage and ice build-up. In areas where pro
longed subfreezing temperatures or heavy snows
occur: increase clearance from 12 to 18 in. by con
structing an angle-iron frame to support unit 12 to
18 in. off concrete base. Cross angle of frame must
not obstruct coil drainage holes. See Fig. 5 for
recommended frame construction. Extend a 12-in.
gravel apron around pad for condensate and defrost
water drainage field.
Fig. 5 — Mounting the Outdoor Coil
4
Since it is lightweight, the outdoor unit can be
mounted on a platform attached to or built out from
structure. Construct platform using drainage and
clearance recommendations above. Locate and con
struct platform to avoid possible transfer of unit
vibration to structure.
ON THE ROOF: MOUNT OUTDOOR COIL ON
A LEVEL PLATFORM OR FRAME. Unit must
be elevated for proper clearance as described
under ground installation above. Roof design and
water drainage must be planned to prevent units
from setting in water. Flash all roof openings to
prevent leaks.
Step 3 — Mount Indoor Compressor Section
on a rigid, solid platform or concrete floor. Insert
1/4-in. asphalt impregnated felt pad (factory
supplied) between unit basepan and mounting
surface to provide full unit support and for vibra
tion attenuation. (Do not use vibration isolator
under corners of basepan.)
Step 4 — Make Piping Connections — The
38HQ units can be connected to indoor fan coil
using Carrier accessory tubing package or field-
supplied tubing of refrigerant grade. See Tables 1
and 2 (with notes) for unit piping connection type,
size and line size recommendations and Table 4 for
accessory tubing sizes. Maximum allowable system
liquid line length is 100 feet. Maximum vapor line
length from compressor section to indoor coil is 50
feet. Maximum vapor line length from eompressor
section to outdoor coil is 50 feet.
A capacity reduction will result if accessory
tubing is used in 38HQ146 systems. For example,
when a 25-ft, 7/8-in. accessory tubing package is
used, there will be a capacity reduction of 1-1/2%.
For maximum capacity, use 1-1/8 in. vapor line as
recommended in Tables 1 and 2.
When other than 25 ft of interconnecting piping
is used, follow special requirements described in
Refrigerant Charging. Do not use less than 10 ft of
liquid line. Do not cut accessory 7/8-in. vapor line.
Bend or coil to fit.
Do not use damaged or contaminated tubing.
Always evacuate or purge indoor coil, compressor
section and tubing system (use field-supplied refrig
erant, not unit refrigerant).
When making tubing conneetions, be sure to pro
vide clearance at unit for electrical connections and
follow tubing isolation method. Step 1, page 3.
Table 4 — Accessories
PART WO
38CQ900081
38CQ900111
38CQ900211
38CQ900152
38HQ900011
38CQ900172
38RQ900091
38RQ900032 Outdoor Thermostat — adjustable control for strip heaters, 48-in long Cap Tube
38HÛ900002
38RQ900012
38RQ900072
38RQ900081
28VQ900011
TUBING PACKAGES
38LS934151
38LS934201
38LS934251
38LS934301
38LS934351
38LS934401
38LS934501
38LS978151
38LS978201
38LS978251
38LS978301
38LS978351
38LS978401
38LS978501
‘Swaged at each end down to 3/4 i
fCapacity reduction may occur when
Honeywell Thermostat and Subbase — Automatic Changeover
Honeywell Thermostat and Subbase — Manual Changeover
White Rodgers Thermostat and Subbase — Manual Changeover
Solid State Time Guard 1
Hot Shot Domestic Water Pre-Heater
Optimizer Control (six 38CQ900161, ref HH22AQ110)
Optimizer II Control (use with Outdoor Thermostat HH22AG110)
Outdoor Thermostat — adjustable control for strip heaters; 36-in long Cap Tube
Supplemental Heat Relay (six 38RQ900001 )
Heat Pump Mounting Stand (six 38RQ900061)
Biflow Liquid Filter-Drier (six KH45LD077)
Twelve 3/4- x 1-1/8 in Connection Adapters for 38HQ146
LENGTH
(ft)
15
20
25
30
35
40
50
15
20
25
30
35
40
50
nch
7/8-in accessory tubing is used on 38HQ146
24 V (six 38CQ900141)
LIQUID LINE SUCTION LINE
OD (in.)
3/8
3/8
DESCRIPTIOW
TUBING
OD (in.)
3/4
7/8*t
COMPRESSOR
SECTION 38HQ
120, 127, 134
140, 146
5
REPLACE THE ACCURATER™ REFRIG
ERANT CONTROL PISTON IN THE INDOOR
AND OUTDOOR COIL AS REQUIRED before
connecting refrigerant lines. See Table 3 and the
notes under the table for the pistons used in the
different system combinations. For piston replace
ment instructions, see AccuRater Servicing on
page 16.
CONNECT REFRIGERANT LINES to fittings on
indoor and outdoor sections, Fig. 1,2 and 6. Indoor
compressor section has 2 Compatible Fitting vapor
line connections. Outdoor coils and indoor fan coils
have Compatible Fitting vapor line connection and
liquid line flare connection.
Connect vapor line from outdoor coil to indoor
compressor section, and from compressor section
to indoor fan coil. Section vapor line as required
(Fig. 6). Use correct compressor section vapor line
connection to indoor fan coil and outdoor coil.
Unit Compatible Fitting(s) permits mechanical or
sweat connection as described below.
When using 1-1/8 in. field-supplied vapor line
(38HQ146 Systems^ remove vapor line adapters (4)
shipped in compressor section. Sweat connect 1-1/8
in. end of adapter to each end of vapor lines. Con
nect 3/4-in. end of adapters to vapor line Com
patible Fitting(s) on outdoor coil, indoor
compressor section and indoor fan coil.
When a 7/8-in. field-supplied vapor line is used
on 38HQ140, 4 field-supplied 3/4-in. to 7/8-in.
vapor line adapters must be provided (not required
if 7/8-in. 38CQ accessory tubing is used).
Flare and connect liquid line from outdoor
coil to indoor fan coil. (Do not disassemble
AccuRater.) It is not necessary to flare system
liquid line if an accessory flare-to-Compatible
Fitting Coupler is used for liquid line connec
tion. See Accessory Coupler, Fig. 7.
Mechanical Connection to Compatible Fitting
(Mate one set of connections at a time.)
1. Loosen nut on Compatible Fitting one turn. Do
not remove.
2. Remove plug and be sure O-ring is in the groove
inside the Compatible Fitting.
3. Cut tubing to correct length.
4. Insert tube into Compatible Fitting until it
bottoms.
5. Tighten nut until it bottoms on back coupler
flange. Keep tube bottomed in Compatible
Fitting while tightening nut.
Fig. 6 — Refrigerant Piping Connections
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