Greenheck Maxitrol Series 44 - Manual (Page 3)

3
Modulator (M) or Modulator-Regulator (MR) Valve: Mount in upright position in horizontal run of pipe, downstream of
other controls - a separate gas pressure regulator must be used with any modulator (M) valve.
Typical Gas Trains
Selectrastat: This component selects and senses space
temperature. Remove cover to mount in heated area
where representative space temperature can be sensed.
Optional:
Remote Temperature Selector: Not temperature
sensitive (selects space temperature). Remove cover to
mount in any convenient location. Note: Temperature
selector and sensor must have same temperature range to
be compatible.
Remote Temperature Sensor: Senses space
temperature. Remove cover to mount in area where
representative space temperature is to be sensed.
Wiring Run: Control wires connected to the Selectrastat,
Discharge Air Sensor, Remote Temperature Selector/
Sensor, Amplifier or Valve must not be run close to or
inside conduit with power or ignition wires. Doing so
may cause the unit to function erratically or may
destroy the amplifier. If shielded wires are used, shield
must be insulated and grounded at the amplifier location
only.
Amplifier: Install in any convenient location that is
protected from the weather and contaminated
atmosphere.
Installation of Components
Specifications
interference may effect performance and/or damage
equipment.
Gases: All fuel gases
Pressure Limits:
Maximum M411, M511, M611 Outlet Pressure: 7.0" w.c.
/17 mbar
MR212 Outlet Pressure Springs: 1" to 3.5" w.c. / 2.5 to 9
mbar, 2" to 5" w.c. / 5 to 12 mbar, and 3" to 8" w.c. / 7
to 20 mbar
Static Pressure Rating (M411, M511, M611 ) ..... 5.0 psi
/345 mbar
Maximum Operating Inlet Pressure (MR212) ...... 5.0 psi
/345 mbar
Maximum Emergency Exposure *(MR212)...... 12.5 psi
/862 mbar
*May not function properly at this pressure, but will suffer
no internal damage. Pressure Adjustment Ranges: (Maximum Fire)
Standard (MR212) ................. 2" to 5" w.c. / 5 to 12 mbar
Standard (MR212-2) .............. 2" to 5" w.c. / 5 to 12 mbar
reduced 0" to 3" w.c. / 0 to 7.5 mbar
Vent: Model M411, M511, M611-vertical vent outlet 1/8"
NPT—12A06 installed.
MR212—two vents located in upper housing, both
equipped with vent limiting means.
Ambient Limits:
Operating
-40° to 125° F / -40° to 52° C
Non-Operating -50° to 185° F / -46° to 85° C
Power Requirements: 24 Volts, NEC Class ll
transformer 20 VA
NOTE: Transformer secondary must not be grounded
in any portion of the circuit external to a Maxitrol
amplifier. If existing transformer is grounded, a
separate isolated transformer must be used. Electrical
MR Valve: Modulator-regulator valve
M Valve: Regulator upstream of modulator valve