Carrier 38QH User Manual
38QH
HEATING A COOLING
Heat Pumps — Outdoor Section
Installation and Start-Up Instructions
SAFETY CONSIDERATIONS
Installing and servicing air conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
should install or service air conditioning equipment.
Untrained personnel can perform basic maintenance,
such as cleaning and replacing filters. All other operations
should be performed by trained service personnel. When
working on air conditioning equipment, observe pre
cautions in literature and on tags and labels attached
to unit.
Follow all safety codes. Wear safety glasses and
work gloves. Use quenching cloth for brazing opera
tions. Have fire extinguisher available. Read these
instructions thoroughly. Consult local building codes
and National Electrical Code (NEC) for special installa
tion requirements.
A WARNING
Before installing or servicing unit, turn off main
power to system. There may be more than one dis
connect switch. Turn off accessory heater power if
applicable. Electrical shock can cause personal
injury.
DISCHARGE
GRILLE
CONTROL
1-1/8" DIAM
HOLE WITH
1-3/8"
CONCENTRIC
KNOCKOUT '
FOR POWER
WIRING
(OPP SIDE)
LIQUID LINE
SERVICE PORT
AT SERVICE^
VALVE(CLG
CYCLE)
SUCTION
SERVICE POR
AT SERVICE
VALVE(CLG
CYCLE)
SUCTION
SERVICE PORT
(HIDDEN)
BOX I 5-5/(
r-6" AIRFLOW AND
SERVICE CLEARANCE
ON 3 SIDES — 12" ON
REMAINING SIDE
INSTALLATION
Step 1 — Check Equipment and Jobsite —
Install on a solid, level mounting pad. It is recommended
that unit be attached to pad using tiedown bolts. Fasten
unit to pad using holes provided in unit mounting feet.
See Fig. 1.
When installing, allow sufficient space for airflow
clearance, wiring, refrigerant piping and servicing. Main
tain a minimum of 4 ft clearance from obstructions above
and 18 in. on 3 sides of unit (12 in. on fourth side). Main
tain a distance of 24 in. between heat pumps. Position so
water or ice from roof or eaves cannot fall directly on unit.
Step 2 — Replace AccuRater™ Refrigerant
Control Piston in the indoor coil, if required, before
conneeting refrigerant lines. See AccuRater Selection
Charts, Table 2.
Step 3 — Make Piping Connections — Outdoor
units may be connected to indoor sections using Carrier
accessory tubing package (refer to Service data) or field-
supplied tubing of refrigerant grade, correct size and
condition (Table 1). For tubing requirements beyond
50 ft, obtain information from local Carrier distributor.
Outdoor units connected to Carrier-approved indoor
units contain correct system refrigerant charge for opera
tion with indoor unit of the same size when connected by
25 ft of field-supplied or Carrier aceessory tubing. Check
refrigerant charge for maximum efficiency (refer to
Table 5 and Service data).
NOTE Mounting pad may be square or circular
MODEL 38QH
DIAMETERS (ft-in.)
SQUARES (Minimum)
(in.)
TIEDOWN BOLT C
LOCATION (tt-in.) D
015,018 024-048 060
1-9Y2 2-5'/4
23
o-ey. 0- 9'/2
1-4
E
0-9'/4 1-1
Fig. 1 — Dimensions, Connections and
Mounting Pad (Refer to Table 1)
30
1-10V2
3-3
40
1-1'=/i6
2-7
1-5ye
Manufacturer reserves Ihe right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Bookll |4 PC 101 Catalog No 533-808 Printed inUS A Form38QH-2SI Pg 1 7-85 Replaces: 38QH-1 SI
38QH
HEATING & COOLING
Table 1 — Physical Data
MODEL 38QH
OPER WT (lb)*
REFRIGERANT
Control
COND FAN
Air Discharge
AirQty (Cfm)
Mtr Rpm (60 Hz)
COND COIL (FIn/in.)
Tube Diam
Rows
Refrig Ckts
Face Area (sq ft)
Outer Row
Inner Row
DIMENSIONS (ft-in.)
Diameter
Height
CONNECTIONS (in. ODF)
Suction
Liquid_________________
REFRIG LINES (in. ODF)
Suction
Liquid________________
*Add 10 lbs for louvered casing (if so equipped). Weight increases slightly
with addition of any accessories
t38QFI042-060 require 1’/e-in. suction line for optimum performance. A
%- X I'/a-in connection adapter accessory (Carrier Part No 28AU900061)
is available. If a 7e-ln accessory tubing package is used, expect a 2'/2%
capacity loss
015 018
132 145 180 195 195 235
024 030 036 042 048
AccuRater” (Bypass Type)
Propeller Type, Direct Drive
1850 I 3100 I 4000 15000
830 850 840
Compatible Fitting (Suction)
1 y4
22
Vertical
& Flare (Liquid)
%
235
17.11 2188
17.11 21.88
I'/at
060
270
3-2'/2
A CAUTION
Heat Pumps.^^utdoor Section
FLARE NUT
Fig. 2 — AccuRater (Bypass Type) Components
4. Insert tube into Compatible Fitting until it bottoms.
Tighten nut until it bottoms on shoulder of fitting or
valve. Keep tube bottomed in Compatible Fitting
while tightening nut.
A CAUTION
If undersized, damaged or elliptically-shaped
tubing is used when making Compatible Fitting,
leaks may result.
DO NOT BURY MORE THAN 3 FT OF REFRIG
ERANT TUBING IN GROUND. If any section of
tubing is buried, there must be a 6-in. vertical rise to
valve connections on outdoor unit. If more than the
recommended length is buried, refrigerant may
migrate to cooler buried section during extended
periods of unit shutdown. This causes refrigerant
slugging and possibly compressor damage at start-up.
CONNECT REFRIGERANT LINES to fittings on out
door unit suction and liquid service valves (Fig. 1). Unit
Compatible Fittings permit mechanical (quick-connect)
or sweat connections.
Models 38OH042,048,060 — When using 1 -1 /8 in. fieldsupplied refrigerant suction line, sweat-connect suction
line to 1-1/8 in. end of required connection adapter. Be
sure to provide a heat sink at the service valve to prevent
damage during sweating operation. Connect 3/4-in. end
of adapter to unit suction line Compatible Fitting.
Connect liquid refrigerant line to unit. When a 7/8-in.
field-supplied suction line is used, provide a field-supplied
3/4-in. to 7/8-in. suction line adapter (not necessary if
38LS accessory tubing is used).
Mechanical Connection — 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. Deburr and size as
necessary.
Sweat Connection— Use refrigerant grade tubing.
1. Remove locking nut, rubber O-ring and Schrader core
and cap from valve service port.
2. Cut tubing to correct length. Deburr and size as
necessary.
3. Insert tube in Compatible Fitting until it bottoms.
NOTE: Wrap top and bottom of service valves in wet
cloth to prevent damage by heat. Solder with lowtemperature 430 F silver alloy solder.
4. Replace Schrader core and cap.
5. Evacuate or purge system with field-supplied
refrigerant.
Compatible Fitting Repair
MECHANICAL CONNECTION — Frontseat unit
service valves. Relieve refrigerant pressure from tubing.
Back off locknut from Compatible Fitting onto tube. Cut
fitting between threads and O-ring. See Fig. 3. Remove
tubing section remaining in threaded portion of fitting.
Discard locknut.
Clean, flux and insert new tube end into remaining
portion of Compatible Fitting. Wrap valve in wet rag to
prevent damaging factory-made joints. Heat and apply
low-temperature (430 F) solder.
SWEAT CONNECTION — Frontseat unit service
valves. Relieve refrigerant pressure from tubing. Clean
and flux around leak. Repair, using low-temperature
(430 F) solder. Evacuate or purge evaporator coil and
tubing system. Add refrigerant charge. Refer to Table 5.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book| 1 |4 PC101 Catalog No 533-808 PrintedinUSA Form38QH-2SI Pg 2 7-85 Replaces: 38QH-1 SI
©
X aK IAaIRa
For r<»nlacement items use Carrier Soecified Parts
38QH
HEATING A COOLING
Heat Pumps — Outdoor Section
Table 2 — AccuRater™ Selection Charts
OUTDOOR
UNIT 38QH UNIT
015 40AQ018
(35)t
018
(42)t
024
(52)t
030
(59)t
036
(61 )t
'Replace factory-installed piston with this piston size
fRequired outdoor piston size
INDOOR
28AC015
28AC.AU018
28HQ.VQ024 49* 28AC.AU048 82*
40AQ024
40DQ014
40DQ018
40DQ024 49
28AC.AU018
28AC.au,AM024
28HQ.VQ024
28HQ.VQ030
40AQ018
40AQ024
40AQ030
40DQ018
40DQ024 52* 28AC260 86*
40DQ030
28AC,AU,AM024
28AC.AU030
28AM036
28HQ.VQ024
28HQ.VQ030
28HQ.VQ036
40AQ024
40AQ030
40AQ036
40DQ024 59
40DQ030 61*
28AC.AU030
28AC.AU036
28AC236
28AM036 70*
28HQ.VQ030
28HQ.VQ036
28HQ.VQ042
28SL030
28SL036
28SL042 73*
40AQ030
40AQ036 70*
40DQ030
28AC.AU036 73
28AC236
28AC.AU042 73’
28AC242
28AM036
28HQ.VQ036
28HQ.VQ042 73*
28HQ.VQ048 73*
28SL036
28SL042 73*
28SL048
40AQ036
40QB042 73’
INDOOR OUTDOOR
PISTON UNIT 38Qh
49‘ 28AC.AU042 80*
49’ 28AC242 80*
46
49* 28AM048
46*
46*
52*
55*
52*
55*
49*
52
55* 28AC248
49* 28AC.AU060
55* 28AM048
61*
63*
63*
59*
61*
63*
59*
61’
63*
70*
73
73
67*
70*
73*
67*
70*
67*
67*
73
73*
70*
70*
70*
73*
70*
842
(73)t
048
(73)t
060331
(78)t
060341
(78)t
INDOOR INDOOR
UNIT
28AC248 82*
28HQ.VQ042 76
28HQ.VQ048
28HQ.VQ060
28SL042
28SL060
40QB.QH048
28AC.AU048 84
28HQ.VQ048
28HQ.VQ060
28SL048
28SL060
40QB048
40QB.QH060
40QB.QH062
28AC.AU060
28AC260
28HQ.VQ060
28SL060 98*
40QB,QH060
40QB.QH062
28AC.AU060
28AC260
28HQ.VQ060 90*
28SL060
40QB.QH060
40QB.QH062
PISTON
82
80*
82*
76*
82*
82
84
86*
84*
82*
84*
82
84*
84*
86*
86*
101*
101*
98*
101*
101*
93*
93*
90*
93
93
Step 4 — Make Electrical Connections — Be
sure field wiring complies with local and national fire,
safety and electrical codes, and voltage to system is within
limits shown in Table 3. Contact local power company
for correction of improper line voltage.
NOTE: Operation of unit on improper line voltage con
stitutes abuse and could affect Carrier warranty. See
Table 3. Do not install unit in system where voltage may
fluctuate above or below permissible limits.
See Table 3 for recommended fuse sizes. When making
electrical connections, provide clearance at unit for refrig
erant piping connections.
INSTALL BRANCH CIRCUIT DISCONNECT PER
NEC of adequate size to handle unit starting current.
Locate disconnect within sight from and readily access
ible from unit, per Section 440-14 of National Electrical
Code (NEC).
ROUTE LINE POWER LEADS — Extend leads from
disconnect through power wiring hole provided (see
Fig. 1) and into unit splice area. Remove control box
cover to gain access to unit wiring.
CONNECT GROUND LEAD AND POWER WIRING
— Connect ground lead to ground connection in control
box for safety. Then connect power wiring. See Fig. 4.
Splice line power leads to yellow and black pigtails. Use
wire nuts and tape at each connection. Connect unit
wiring to copper power wiring only.
CONNECT CONTROL POWER WIRING — Route
24-v control wires through control wiring hole and
channel and eonnect leads to control wiring terminal
board. See Fig. 1 and 5.
Use furnace or fan coil transformer as 24-v (40-va
minimum) supply for system as shown in Fig. 5, or use
accessory transformer (refer to Service data).
--------
I-PHASE
CONN. TO
DISCONNECT
PER NEC
GROUND LEAD- -IUgrounding lug
_
----------------------------------
— YEL
1- PHASE
UNIT
COMPATIBLE FITTING
^ Splice Connections
_________
----------------
Fig. 3 — Compatible Fitting
Field Wiring
Factory Wiring
Fig. 4 — Line Power Connections
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book|1 14 PC101 Catalog No 533-808 Printed in U.S A Form38QH-2SI Pg 3 7-85 Replaces: 38QH-1 SI
Tah IRaIRa
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