Carrier 38QB - Manual

Number One
AirConditbninq
Maker
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Installation, Start-Up
and Service Instructions
Division of
Carrier Corporation
Carrier Parkway • Syracuse NY 13221
Heat Pump — Outdoor Section
CONTENTS
Page
SAFETY CONSIDERATIONS............................. 1
INSTALLATION................................................. 1-6
Step
1 —Check Equipmentand Jobsite.. 1
• UNPACK UNIT
• INSPECT EQUIPMENT
• COMPLETE OR CONSIDER SYSTEM
REQUIREMENTS
Step 2 — Mount Outdoor Heat Pump ... 2
• ON THE GROUND: MOUNT ON A
SOLID, LEVEL CONCRETE PAD
• ON THE ROOF: MOUNT ON A LEVEL
PLATFORM OR FRAME
Step 3 — Make Piping Connections....................2-5
• REPLACE THE ACCURATER™ RE­
FRIGERANT CONTROL PISTON IN
THE INDOOR COIL AS REQUIRED
• CONNECT REFRIGERANT LINES
Step 4 — Make Electrical Connections... 5-6
• 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.......................................................... 6-8
SERVICE.......................................................... 8-16'*
MAINTENANCE............................................. 16-19
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning
equipment can be hazardous due to system pres­
sure and electrical components. Only trained and
qualified service personnel should install, repair or
service air conditioning equipment.
Untrained personnel can perform basic mainte­
nance functions of cleaning coils and cleaning and
replacing filters. All other operations should be per­
formed 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 opera­
tions. Have fire extinguisher available for all brazing
operations.
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 38QB.
Consult local building codes and National Elec­
trical Code (NEC) for special installation
requirements.
When installing, allow sufficient space for airflow
clearance, wiring, refrigerant piping and servicing.
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 instal­
lation method for 38QB depends on building con­
struction and special requirements of local codes.
Be sure that roof can support unit weight.
It is recommended that 38 QB units be used with
Carrier approved indoor sections; see Table I.
System Refrigerant Control on 38QB units and
matching Carrier indoor units is a factory-installed
AccuRater device (bypass-type). Bypass-type Accu-
Rater components are discussed in the service sec­
tion 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 38QB outdoor unit. Replace piston as
described under AccuRater Servicing on page 15.
© Carrier Corporation 1983 Form 38QB-7SIM