Carrier 38QF - Manual

Number One
Air Conditioning
i\Mer
^S b Division of
^ 0 Carrier Corporation
Carrier Parkway • Syracuse, N.Y. 13221
Heat Pump — Outdoor Section
CONTENTS
SAFETY CONSIDERATIONS
INSTALLATION.............................
Page
.. 1
. 1-5
.. 1 Step 1 — Check Equipment and Jobsite
• UNPACK UNIT
• INSPECT EQUIPMENT
• COMPLETE OR CONSIDER SYSTEM
REQUIREMENTS
Step 2 — Mount Outdoor Heat Pump ..................2
• ON THE GROUND; MOUNT UNIT
ON A SOLID, LEVEL CONCRETE
PAD
• ON THE ROOF: MOUNT UNIT ON
A LEVEL PLATFORM OR FRAME
Step 3 — Make Piping Connections................... 3
• REPLACE THE ACCURATER™ RE­
FRIGERANT CONTROL PISTON IN
THE INDOOR COIL AS REQUIRED
• CONNECT REFRIGERANT LINES
Step 4 — Make Electrical Connections ... 4
• INSTALL A BRANCH CIRCUIT
DISCONNECT PER NEC
• ROUTE LINE POWER LEADS
INTO UNIT
• CONNECT GROUND LEAD AND
POWER WIRING
• SEE INDOOR UNIT AND ELECTRIC
HEATER INSTALLATION, START-UP
AND SERVICE INSTRUCTIONS
• CONNECT CONTROL POWER
WIRING (24 v)
START-UP .............................................................. 5-7
SERVICE ................................................................. 7-14
MAINTENANCE .....................................................14-17
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 serv­
ice air conditioning equipment.
Untrained personnel can perform basic main­
tenance functions of cleaning coils and cleaning
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 oper­
ations. Have fire extinguisher available for all braz­
ing operations.
W.ARNING: Before performing scr\icc or
maintenance operations on sxstem. turn ofl
main powci switches to indoor unit and out­
door unil. 1 urn ofl acccssoiA heater power
switch if applicable, riectrical shock could cause
personal itijur\.
INSTALLATION
Step 1 — Check Equipment and Jobsite
UNPACK UNIT — Move to final location. Lift
carton off, taking special care not to damage service
valves 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 38QF.
Consult local building codes and National
Electrical Code (NEC) for special installation
requirements.
When installing, allow sufficient space for air­
flow clearance, wiring, refrigerant piping and serv­
icing. Position so water or ice from roof cannot drop
directly on top of unit.
Make provisions for condensate drainage and
defrost water disposal whether unit is installed on
ground or roof. (Ensure unit basepan drainage holes
are not blocked.) See Step 2 for details. Roof in­
stallation method for 38QF depends on building
construction and special requirements of local
codes. Be sure that roof can support unit weight.
It is recommended that 38QF units be used with
Carrier approved indoor sections; see Table 1.
System Refrigerant Control on 38QF units and
matching Carrier indoor units is a factory-installed
AccuRater™ device (bypass type). Bypass-type
AccuRater components are discussed in the service
section of this booklet. The AccuRater piston has a
refrigerant metering hole thru it and is field replace­
able. Table 1 indicates indoor units for which the
required replacement piston is factory supplied with
specified 38QF outdoor unit. Replace piston as
described under AccuRater™ Servicing on page 13.
© Carrier Corporation 1983 Form 38QF-2SI