Product Overview

8
Maxitrol Company
23555 Telegraph Rd., PO Box 2230
Southeld,MI48037-2230
MMR_MT_EN_09.2016
www.maxitrol.com
© 2016 Maxitrol Company
All Rights Reserved
M/MR Series Literature
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.
Figure 6 : M Valve-Regulator upstream of modulator valve
Figure 7 : MR Valve-Modulator/Regulator Valve
Figure 8 : If diaphragm type automatic gas valve is used with separate
regulator, install MR valve downstream from diaphragm gas valve. Retain
regulator in manifold and adjust 2 or 3 turns to compensate for pressure
drop of MR valve.
TYPICAL INSTALLATIONS
Figure 9 : If full combination control is used, install MR valve downstream.
Adjust regulator in combination control 2 or 3 turns to compensate for
pressure drop of MR valve.
Figure 10 : If solenoid type automatic gas valve is used with separate
regulator, replace regulator with the MR valve.
NOTE: MR Valve must be in upright position, in horizontal run of
pipe only with pilot gas supply upstream.
MODEL DESIGNATIONS
Models having the letters B, H, M, R, or W, or a combination of
thesesufxletters,indicates the design modicationdescribed
below:
B Bothsidesttedforlowreadjustment.
H Capableofatotalmodulationspanofasmuchas10”w.c.
M PL parallel thread conforms to ISO 7-1.
R
Rightsideoutlet-lowreby-passadjustmentonrightside.
Available on models: M411, M511, M420, and M520.
W
Indicates covered wire terminal connections, same as
M611. Available on models: M411, M511, M420, M520,
M620, M451, M551, and M651.
NOTE: Models M411, M511, and M611 are available with 1/8”
NPT connection for reading outlet pressure. Not available
on“B”modelsconnectionislocatedonoppositesideof
by-passadjustment(SeeDimensions,page5).
TO BURNERS
GAS
FLOW
PRESSURE
REGULATOR
MR
DIA-
PHRAGM
VALVE
TO BURNERS
MR
GAS
FLOW
COMBINATION
CONTROL
TO BURNERS
GAS
FLOW
MR
SOLENOID
VALVE
© 2016 Maxitrol © 2016 Maxitrol
© 2016 Maxitrol
© 2016 Maxitrol
© 2016 Maxitrol