Specifications

1
2
3
4
5
0.31"
1.50"
2.69"
0.70"
1.91"
3.08"
3.95"
Figure 2 - Subbase Mounting Holes & Dimensions
F) Thermostat Accessories
The following accessories are not offered from the factory, but can be purchased from Invensys Building
Systems.
(1) Thermostat Locking Cover - When a locking cover is required for a dual-mount thermostat that is
mounted in the space, Invensys part AT-1155 may be used.
(2) Thermostat Guard - When a thermostat guard (non-locking) is required for a dual-mount thermostat,
Invensys parts AT-1104 (Cast Aluminum) and AT-1163 (Wire Guard) may be used.
(3) Remote Space Temperature Sensor - This sensor may be field wired in place of the factory
mounted room air sensor (RAT). Unlike the dual-mount thermostat (which remains in the unit), this
sensor does not allow setpoint adjustments nor does it provide a display. This is Invensys part
TSMN-57011-850.
2) Discharge Air, Outdoor Air, and Room Air Sensors
A) Description
The discharge air, outdoor air, and room air sensors use a 2-wire, 10K-thermistor element with an 11K
shunt. These sensors have a maximum error rate of +/- 0.36°F over 32° to 158°F. These sensors have
a maximum drift of 0.045°F per year, over the 32° to 158°F temperature range.
B) Sensor Location
The discharge air temperature (DAT) sensor is located in the discharge air stream. On some units, this
sensor is mounted in the discharge of the left most blower scroll. On later model units, this sensor is
mounted behind the "front" access panel, with the sensor located between the coil and a fan inlet.
The outdoor air temperature (OAT) sensor is located on the left-end of the unit. This sensor projects into
the outdoor air stream, immediately upstream of the outdoor air damper.
The room air temperature sensor (RAT) is located behind the decorative room air grille in "front" access
panel. This sensor is mounted near the room air intake hole on the blower section. It is important that
this sensor remain outside the blower compartment.
7/1/03 Part Number 011-200001-003 Page 4