f. Refer to 38HDC, 38HDS, and 38QRC Installation,
Start-Up and Service Instructions for additional out-
door unit installation information.
g. Install a liquid line filter drier near the 38HDC or QRC
outdoor unit. On heat pump systems, a bi-flow filter
drier must be used.
3. Insulate and caulk wall openings to reduce air infiltration
and refrigerant pipe vibrations on structure.
4. Evacuate piping, if necessary. If either refrigerant piping
or the indoor coil is exposed to atmospheric conditions,
it must be evacuated to 1000 microns to eliminate con-
tamination and moisture in the system. Refer to Carrier’s
Standard Service Techniques Manual, Chapter 1, Sec-
tions 1-7.
Table 4 — Required Piston Size for AccuRater Metering Device, Cooling-Only Systems
INDOOR
UNIT 40QAB
OUTDOOR
UNIT 38HDC
PISTON SIZE
REQUIRED
REQUIRED SYSTEM
CHARGE (lb)*
024† 018 53 3.7
024 024 57 5.5
036
030 65 5.6
036 70 5.4
048 048 84 7.4
060 060 93 13.6
*Charge is based on 25 ft of interconnecting tubing. Charge may need to be added for longer tubing runs or when used with certain fan coil units.
†Unit is field reconfigured for 18,000 Btuh operation. See Before Installation section on page 3 for reconfiguration details. Check outdoor unit name-
plate for required charge.
NOTES:
1. All pistons are Chattleff 9B9 type.
2. All cooling units have a full factory charge for the smallest possible system combination.
3. Service valves are front-seating type.
Table 5 — Required Piston Size for AccuRater Metering Device, Heat Pump Systems
INDOOR
UNIT 40QAE
OUTDOOR
UNIT 38QRC
INDOOR PISTON
SIZE (COOLING)
OUTDOOR PISTON
SIZE (HEATING)
REQUIRED SYSTEM
CHARGE (lb)*
024† 018 55 49 4.3
024 024 55 49 6.3
036
030 63 55 6.4
036 63 61 7.5/8.7**
048 048 84 78 10.0
060 060 96 82 11.9
*Charge is based on 25 ft of interconnecting tubing. Charge may need to be added for longer tubing runs or when used with certain fan coil units.
Check outdoor unit nameplate for required charge.
†Unit is field reconfigured for 18,000 Btuh operation. See Before Installation section on page 3 for reconfiguration details. Check outdoor unit
nameplate for required charge.
**Single phase/3 phase.
NOTES:
1. All pistons are Chatleff 9B9 type.
2. All heat pumps have a holding charge only as shipped from the factory.
NOTE: Arrow on AccuRater® body points in
free flow
direction away
from the indoor coil.
Fig. 13 — AccuRater Metering Device in Liquid
Line (Bypass Type Components), 38HDC and QRC
Systems Only
NOTE: Teflon Seal must face toward the outdoor heat pump unit.
Fig. 14 —AccuRater Metering Device at Service Valve
(Bypass Type Components),
38QRC Systems Only)
9
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