I"li, Fig. 8 — control connections – Carrier 50YQ User Manual
Page 6
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MOUNT
OUTDOOR
THERMOSTAT(S)
—
Locate maximum of 2 outdoor thermostats in the
compressor section on the partition to the left of the
reversing valve. Fasten with sheet metal screws using
engagement holes provided. Uncoil a short length of
capillary and insert bulb into rubber grommet in the
partition. Moisten bulb to assist insertion. Insert all
but 1 in. of bulb. Secure remaining capillary.
MOUNT EMERGENCY HEAT REEAY in the
compressor section on the partition to the left of the
reversing valve using engagement hole provided.
Fasten with sheet metal screws.
To Start Unit
— Check that main power is on and
that compressor crankcase heater has been ener
gized for at least 24 hours.
1. Check that heater main power is on as applicable.
2. Set selector switch at OFF.
3. Set fan switch as desired (FAN) (AUTO.).
4. Set thermostat dial at the desired temperature.
5. Set selector switch at HEAT or COOL. Check
system refrigerant charge. See Refrigerant
Charging.
Unit
Single-Phase
Compressors
that
are
Equipped with a Compressor Start Thermistor
(PTC device) (024,030,036)
— When supply
voltage is within 10% limit and compressor does not
start, check the start thermistor with an ohmmeter.
CHECKING START THERMISTOR
1. Shut off all power to unit and wait 10 minutes
for thermistor to cool to ambient temperature.
2. Remove thermistor from circuit.
3. Measure resistance of thermistor with ohm-
meter. Normal resistance readings are 25 ohms
± 20% at 75 F ambient temperature.
4. If ohmmeter resistance reading is not within the
± 20%, the thermistor is defective and must be
replaced.
THERMOSTAT
a
SUBBASE
(SEE BELOW)
50YQ UNIT
CONTROL WIRING
TERMINAL BOX
CHANGEOVER
Automatic
Manual
Manual
Automatic
___SUBBASE
J-IH93AZ073
HH93AZ075
Subbase included
Subbase included
THERMOSTAT
HH07AT071
HH07PZ085
HH07PZ08^6
COOLING AND ONE-STAGE HEATING
(without Electric Heater)
THERMOSTAT
a
SUBBASE
(SEE BELOW)
50Y0 UNIT
CONTROL WIRING
TERMINAL BOX
R -
G —
Y -
0 --
—
-- R
- G
- Y
0
E —
INSTALL
r '
JUMPER
-W3 —
L
-VI0-(HRI
-0RN-(HR3
-BRN
HR — Heater Relay
THERMOSTAT
a
SUBBASE
(SEE BELOW)
50YQ UNIT
CONTROL WIRING
TERMINAL BOX
R -
G -
Y -
0
-
W2-
E -
ro
^—
! =^00
INSTALL-
JUMPER
- R
• G
--------
Y
-
0
-E-
- -W3-
C -
-VI0-(HR1
--------^BLK-(
h
R2)
-0RN-(
h
R3
-BRN
ODT — Outdoor Thermostat
HR — Heater Relay
COOLING AND TWO-STAGE HEATING
(Unit equipped with 88EJ Electric Heater,
Emergency Heat, one Outdoor Thermostat)
THERMOSTAT
a
SUBBASE
(SEE BELOW)
50YQ UNIT
CONTROL WIRING
TERMINAL BOX
R -
-- R
G -
- G
Y -
— Y
0 -
-- 0
W2--
-^W2^:
E --
(EH^ j0DT2[^"U0DTl
■ - E —^
1 L
-|
-W3—^
c —
— C — -
L
-VI0-(HRI
I"LI
L
ehr
"
J
-■bRN-(HR3'
EHR
HR
ODT
— Emergency Heat Relay
— Heater Relay
— Outdoor Thermostat
COOLING AND TWO-STAGE HEATING
(Unit equipped with 88EJ Electric Heater,
Emergency Heat, no Outdoor Thermostats)
Fig. 8 — Control Connections
COOLING AND TWO-STAGE HEATING
(Unit equipped with 88EJ Electric Heater, Emergency
Heat Relay, two Outdoor Thermostats)
7 8 1