Siemens Free Energy Band TH 193 HC User Manual download pdf (Page 25)

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Thermostats

A-25

188 Unit Mounted Thermostat.

Applications

The 188 Unit Mounted Thermostats are designed primarily

for use in fan coil induction units and unit ventilators to

control the temperature within and occupied space. The

thermostats temperature range is limited to applications at

ambient temperatures.

Description

The 188 Unit Mounted Thermostat is a gradual acting

thermostat with a remote bulb operating on the force-

balance principle, using pneumatic feedback to obtain

linearity and maintain selected room temperature by

positioning pneumatic devices to control heating or

cooling.

Features

• Liquid-ﬁ lled thermal system temperature

sensing element

• Durable die-cast metal case with rugged setpoint knob

• Adjustable sensitivity

• Universal mounting bracket for easy installation

• Integral adjustable limit stops

• Available as:

– Direct Acting only (Heating)

– Reverse Acting only (Cooling)

– Heat or Cool depending on supply air pressure

Typical Connections

188

Unit Mounted Thermostats

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Siemens Free Energy Band TH 193 HC User Manual Page 25