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T7350 Commercial Programmable Thermostat
63-2605—06
22
a
Unless otherwise, noted, Economizer logic ignores calls for
heat. The Economizer relay will be energized during calls for
cooling.
b
With fan set to AUTO and call for neither heat nor cool, the
relay is open in order to disable damper minimum position.
Other Uses for the Auxiliary Relay
Examples of other uses of the auxiliary relay are hot water
heaters, lighting, or baseboard heat. The additional loads are
connected to the auxiliary relay contacts on the subbase. The
contacts are rated for 1.5A at 30 Vac, but can be adapted to
higher current applications using an external relay.
(See Fig. 14 through 16.)
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.
Table 16. Auxiliary Relay Logic (Economizer and TOD)
Occupancy Auxiliary Contacts
Scheduled
Period
Motion
Sensor
Signal
Effective
Occupancy
Economizer TOD
Occupied
No
Sensor
Wired
Occupied
Closed
b
Closed
Occupied
Motion
Sensed
Occupied
Closed
b
Closed
Occupied
No
Motion
Sensed
Standby
Open; Closed
only during calls
for cool
a
Open
Standby
No
Sensor
Wired
Standby
Open; Closed
only during calls
for cool
a
Open
Standby
Motion
Sensed
Standby
Open; Closed
only during calls
for cool
a
Open
Standby
No
Motion
Sensed
Standby
Open; Closed
only during calls
for cool
a
Open
Not
Occupied
No
Sensor
Wired
Not
Occupied
Open; Closed
only during calls
for cool
a
Open
Not
Occupied
Motion
Sensed
Not
Occupied
Open; Closed
only during calls
for cool
a
Open
Not
Occupied
No
Motion
Sensed
Not
Occupied
Open; Closed
only during calls
for cool
a
Open
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