Carrier 38QH - Manual

HEATING A COOLING
38QH
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
BOX I 5-5/(
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)
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 015,018 024-048 060
DIAMETERS (ft-in.) 1-9Y2 2-5'/4 3-3
SQUARES (Minimum)
(in.)
23 30 40
TIEDOWN BOLT C o-ey. 0- 9'/2 1-1'=/i6
LOCATION (tt-in.) D 1-4 1-10V2 2-7
E 0-9'/4 1-1 1-5ye
Fig. 1 — Dimensions, Connections and
Mounting Pad (Refer to Table 1)
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