Technical Instructions
Low Temperature Detection Cut-out and Alarm Thermostat
Document Number 155-016P25
Rev.1, February, 2000
Page 2
Siemens Building Technologies, Inc.
WARNING:
This low temperature detection thermostat is designed for use
only as an operating control. Where an operating control failure
would result in personal injury and/or loss of property, it is the
installer’s responsibility to add devices (safety, limit controls) or
systems (alarm, supervisory systems) that protect against, or
warn of control failure.
Specifications
Switch Action
Main (LINE-M2) contacts open on
temperature drop, simultaneously auxiliary
contacts close
Range
15 to 55°F (-9 to 13°C)
Maximum bulb temperature
400°F (204°C)
Minimum differential
5°F (2.8°C) Non-adjustable
Sensing element
Vapor filled
Bulb length
1/8-inch OD x 20 feet (6 m)
Reset action
Manual
Electrical rating
See
Table 1
Weight
2.4 lbs. (1.1 kg)
Dimensions
See
Figures 2 and 5
Approvals
UL file SA 3863
CSA file LR948
Operation
This thermostat incorporates a temperature sensing element of the vapor-filled type
which actuates a heavy duty contact through a rugged link mechanism.
Any one-foot length of the element subjected to temperatures below the temperature
setting of the thermostat will actuate the thermostat switch mechanism regardless of
the temperature being sensed by the remainder of the element. This makes the
thermostats ideal for protecting large coils where air stratification could cause
freezing conditions in a localized area.
The thermostat has a main and auxiliary contact unit. The main load circuit
(LINE-M2) opens on temperature drop and simultaneously, an auxiliary or alarm
circuit (LINE-Ml) closes on temperature drop.
NOTE:
The reset button must be manually pressed down and released to resume
normal fan system operation.
