IMPORTANT: The factory-supplied piston MUST
be installed as shown in Fig. 13.
NOTE: DO NOT install a piston on 38HDS systems. Re-
frigerant control is handled by a TXV (thermostatic ex-
pansion valve) in the 38HDS unit in these systems.
For special applications, such as long lines or raised el-
evations, consult theApplication Data section of the Prod-
uct Data literature for specific system requirements. The
arrow on the AccuRatert device body must face away from
the indoor coil.
e. On heat pump (38QRC) installations, install factory-
supplied piston (enclosed in a bag taped inside the out-
door unit) into the AccuRater metering device located
in the service valve on the outdoor unit (Fig. 14).
IMPORTANT: The factory-supplied piston MUST
be installed as shown in Fig. 14.
Make sure Teflon seal on the piston faces toward the
outdoor unit. Use Table 5 to verify you have the re-
quired piston size for the system being installed. For
special applications, such as long lines or raised eleva-
tions, consult theApplication Data section of the Prod-
uct Data literature for specific system requirements.
Fig. 10 — Mounting Hanging Brackets
HEX-HEAD
BOLT
MOUNTING
SLOT
Fig. 11 — Hanging 40QA Unit
*Factory supplied.
Fig. 12 — Routing Wires Over Piping
8
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