Honeywell T7350 Product Data page 21

T7350A,B,D,M SUBBASE
AUX
RH
AUXILIARY
RELAY
CONTACT
X
RELAY REQUIRED (R8222 OR SIMILAR).
1
Fig. 14. Using T7350A,B,D,M models with an external
relay (with loads greater than 1.5A).
T7350H SUBBASE
AUX
AUX
AUXILIARY
RELAY
RH
CONTACT
X
RELAY REQUIRED (R8222 OR SIMILAR).
1
Fig. 15. Using T7350H models with an external relay
powered from thermostat transformer.
Heat Pump or Contact Not Used
Conventional as Heat or Cool Stage
Heat Pump Y3 not
W2 not aux heat
Conventional W3 not
Y3 not (W3 not)
Y3 not (W3 used)
Auxiliary Contact Configuration
a
Simple 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.
b
The PDA configuration tool output screen displays available Auxiliary Relay functions based on this configuration.
TO
LOAD
1
M19613
TO
LOAD
1
M22487
Table 17. Default Auxiliary Relay Operations.
Contact Configuration of Contact Not Used as Stage
Simple
a
Dehumidification
Economizer
Simple
a
Dehumidification
Economizer
Simple
a
Dehumidification
b
Time of Day
:
21
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
T7350H SUBBASE
AUX
AUX
AUXILIARY
RELAY
CONTACT
RELAY REQUIRED (R8222 OR SIMILAR).
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
2
AND OVERLOAD PROTECTION AS REQUIRED.
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.
Simple Time of Day
a
Dehumidification
Time of Day Economizer
Simple Simple
a
Dehumidification Dehumidification
Time of Day Time of Day
Simple Simple
a
Dehumidification Dehumidification
Hot Gas Bypass
Economizer
Dehumidification
TO
LOAD
1
L2
2
L1
(HOT)
AUXILIARY
TRANSFORMER
M22488
Time of Day
Economizer
Time of Day
a
Economizer
Time of Day
a
Simple
a
Dehumidification
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