Fig. 5 — control circuit connections – Carrier 38QF User Manual
Page 6
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THERMOSTAT
SUBBASE
HH93AZI73
OR HH93AZI75
40AQ.40FQ OR 40QB FAN COIL
38QF
COOLING CONTROL KIT
TERM INAL
TERMINAL BOARD
BOARD
COOLING AND ONE-STAGE HEATING
(38QF/40AQ 0R40QB/QB WITHOUT ELECTRIC HEATER)
A
THERMOSTAT
SUBBASE
HH93AZI73
OR HH93AZI75
40AQ,40FQ OR 40QB
ELECTRIC HEATER
TERMINAL BOARD
38QF
TERMINAL
BOARD
EQUIPPED WITH ELECTRIC HEATER;
SUPPLEMENTAL HEAT, ONE OUTDOOR THERMOSTAT)
THERMOSTAT
SUBBASE
HH93AZ173
40AQ,40FQ OR 40QB
ELECTRIC HEATER
TERMINAL BOARD
38QF
TERMINAL
BOARD
THERMOSTAT
SUBBASE
40AQ,40FQ OR 40QB
ELECTRIC HEATER
38QF
TERMINAL
COOLING AND TWO-STAGE HEATING
(38QF WITH 40AQ, 40QB/QH OR 40FS/28VQ
EQUIPPED WITH ELECTRIC HEATER;
SUPPLEMENTAL HEAT, NO OUTDOOR THERMOSTATS)
B
COOLING AND TWO-STAGE HEATING
(38QF WITH 40FS/28VQ
EQUIPPED WITH ELECTRIC HEATER;
SUPPLEMENTAL HEAT, TWO OUTDOOR THERMOSTATS)
SHR — Supplemental Heat Relay
ODT — Outdoor Thermostat
_______ Factory Wiring
_______ Field Wiring
*Transformer (60 va) located in cooling control kit or electric heater.
fRemove factory-installed jumper (Connection B) when installing outdoor thermostats (ODT).
Fig. 5 — Control Circuit Connections
Accessory Outdoor Thermostat
provides adjust
able outdoor control of accessory electric heater.
This thermostat makes contact when a drop in out
door temperature occurs. It energizes a stage of elec
tric heat when the outdoor temperature setting is
reached, provided the room thermostat is on the
second stage of heating. One outdoor thermostat is
recommended for each stage of electric heat after the
first stage. Set the outdoor thermostat(s) progres
sively lower for each stage. Refer to heat load of
building and unit capacity to determine the correct
outdoor thermostat settings.
The accessory supplemental heat relay is required
when 2 outdoor thermostats are used. It is auto
matically energized by the manually operated sup
plemental heat switch in the indoor thermostat
subbase. The thermostat locks out compressor and
the relay bypasses the outdoor thermostats for
electric heater operation during heat pump shut
down. When one outdoor thermostat is used a
supplemental heat relay is not required. The sup
plemental heat switch in the indoor thermostat
subbase bypasses outdoor thermostat, locks out
compressor and activates electric heater.