Specifications; Installation Of Components; Typical Gas Trains; Pressure Adjustment Ranges - Maxitrol Selectra Installation Instructions Manual

SpeCIfICatIonS

Pressure Adjustment Ranges: (Maximum Fire)
Standard (MR212)
Standard (MR212-2)
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

InSTALLATIon of CoMPonenTS

Wiring Run: Control wires connected to the Selec-
trastat, 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.
Selectrastat: This component selects and senses space tempera-
ture. Remove cover to mount in heated area where representative
space temperature can be sensed.

TyPICAL GAS TRAInS

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.
MR Valve: Modulator-
regulator valve
M Valve: Regulator upstream of
modulator valve
© 2008 Maxitrol Company, All Rights Reserved
2" to 5" w.c. / 5 to 12 mbar
2" to 5" w.c. / 5 to 12 mbar reduced 0"
to 3" w.c. / 0 to 7.5 mbar
noTe: Transformer secondary must not be grounded in any
portion of the circuit external to a Maxitrol amplifier. If exist-
ing transformer is grounded, a separate isolated transformer
must be used. electrical interference may effect performance
and/or damage equipment.
Gases: Suitable for application in natural, manufactured, mixed
gases, liquefied petroleum gases and LP gas-air mixture piping
systems.
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.
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.
AuTOMATIC SAFETy
SHuT-OFF VALVE
AuTOMATIC SAFETy
SHuT-OFF VALVE
4