Filter
Top Products
17MUA-PRC001-EN
Controls
Component Description
1
Selectrastat
™
Mounted on remote control station in
heated area where temperature is
sensed. Temperature range 55 F to 90 F.
2
Air Monitor
Installed in blower discharge. Senses
temperature.
3
Amplifier
Installed in electrical control panel.
Contains adjustments for maximum and
minimum discharge air temperature,
three calibrating potentiometers and a
sensitivity adjustment.
4
Modulator/Regulator Valve
Mounts in gas piping manifold. Receives
electrical signal from amplifier and
adjusts gas pressure to maintain desired
temperature.
5
Remote Control Station
Optional
System 44 Applications
Provides space temperature control
electronically and is ideal for commercial
and industrial buildings.
Temperature Control Operation
Desired temperature at is set at the
Selectrastat on the remote control
station. The Selectrastat controls the
discharge air temperature as long as this
temperature remains within preset
maximum and minimum limits. If the
discharge air temperature approaches
either of the set limits, the discharge air
monitor will signal the amplifier ,
which will adjust the discharge air
temperature to a higher or lower level
via the modulator/regulator valve .
When the space temperature
approaches the assigned setting, the
Selectrastat resumes control.
Control Sequence with Fan and
Heat Switches
Fan and heat switches are included
when the remote control station is
ordered as an option.
Fan Switch On
Optional damper opens, damper end
switch closes, fan motor starter is
energized, fan runs.
The freeze-stat will stop the fan if the
discharge leaving air temperature is
below 45 F, three minutes after the fan is
turned on.
Fan Switch Off
Optional damper closes, damper end
switch opens, fan motor starter is de-
energized, fan is off.
Heat Switch On
If the fan switch is on, and the air flow
switch closes, power is applied to the
flame failure safeguard relay to begin
predetermined ignition sequence.
Note: The fan switch must be on, or the
burner will not light, even if the heat
switch is on.
Heat Switch Off
Heat is off.
Optional
System 44 — Space Temperature Control