T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
21 63-2605—5
Fig. 14. Using T7350A,B,D,M models with an external
relay (with loads greater than 1.5A).
Fig. 15. Using T7350H models with an external relay
powered from thermostat transformer.
Fig. 16. Using T7350H models with an external relay
powered from an auxiliary transformer.
Default Auxiliary Relay Operations (T7350D, T7350H1009 only)
Unless configured as a stage of heating or cooling, terminals
W2, W3, and Y3 operate for specific auxiliary functions. Each
output takes on different auxiliary functions depending on
configuration for Conventional or Heat Pump operation. See
Table 17 for details.
NOTE: The default functions cannot be modified. They are
limited to firmware version 1.3.0 or higher.
M19613
1
1
RELAY REQUIRED (R8222 OR SIMILAR).
T7350A,B,D,M SUBBASE
TO
LOAD
AUXILIARY
RELAY
CONTACT
AUX
RH
X
M22487
1
1
RELAY REQUIRED (R8222 OR SIMILAR).
T7350H SUBBASE
TO
LOAD
AUXILIARY
RELAY
CONTACT
AUX
RH
AUX
X
M22488
1
2
1
RELAY REQUIRED (R8222 OR SIMILAR).
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
T7350H SUBBASE
TO
LOAD
AUXILIARY
RELAY
CONTACT
AUX
AUX
2
L1
(HOT)
L2
AUXILIARY
TRANSFORMER
Table 17. Default Auxiliary Relay Operations.
aSimple dehumidification uses a normally closed contact. The relay is closed when humidity is below the high limit. When the
humidity is above the high limit, the contact is open.
bThe PDA configuration tool output screen displays available Auxiliary Relay functions based on this configuration.
Heat Pump or
Conventional
Contact Not Used
as Heat or Cool Stage Contact Configuration of Contact Not Used as Stage
Heat Pump Y3 not Simple
Dehumidificationa
Simple
Dehumidificationa
Time of Day Time of Day
W2 not aux heat Economizer Time of Day Economizer Economizer
Conventional W3 not Simple
Dehumidificationa
Simple
Dehumidificationa
Simple
Dehumidificationa
Time of Da y
Y3 not (W3 not) Economizer Time of Day Time of Day Economizer
Y3 not (W3 used) Simple
Dehumidificationa
Simple
Dehumidificationa
Simple
Dehumidificationa
Time of Da y
Auxiliary Contact Configurationb:Time of Day Economizer Hot Gas Bypass
Dehumidification
Simple
Dehumidificationa