Install Instructions
2
M651 - vertical vent outlet 1/8" NPT - 12A06 installed.
Model MR212 - two vents located in upper housing, both
equipped with vent limiting means.
Ambient Limits:Ambient Limits:
Ambient Limits:Ambient Limits:
Ambient Limits:
Amplifier: Operating ................ -40
o
to 125
o
F / -40
o
to 52
o
C
Non-operating ......... -50
o
to 185
o
F / -46
o
to 85
o
C
Selector: Operating ................... 15
o
to 140
o
F / -9
o
to 60
o
C
Non-operating ........... -5
o
to 155
o
F / -21
o
to 68
o
C
Amp/Selector: Operating .................. 15
o
to 125
o
F / -9
o
to 52
o
C
Non-operating ........... -5
o
to 155
o
F / -21
o
to 68
o
C
Modifications:Modifications:
Modifications:Modifications:
Modifications:
Models M411, M420, M451, M511, M520, M551, M620, M651 are
available as "W" models - indicates covered wire terminal
connections (same as M611).
Models M411, M420, M511, M520, M611, and M620 are available
with side pressure tap for reading outlet pressure - on side
opposite of minimum adjustment mechanism.
Models M451, M551, and M651 available on either side.
Mounting:Mounting:
Mounting:Mounting:
Mounting:
Must be mounted in upright position in horizontal pipe run,
downstream of all other controls except high pressure cut-off
switch if used.
Specifications and Dimensions
Pressure Adjustment Range: Pressure Adjustment Range:
Pressure Adjustment Range: Pressure Adjustment Range:
Pressure Adjustment Range:
(Maximum Fire)(Maximum Fire)
(Maximum Fire)(Maximum Fire)
(Maximum Fire)
Normal (MR212) .................................. 2" - 5" w.c. / 5 - 12.5 mbar
Normal (MR212-2) ............................... 2" - 5" w.c. / 5 - 12.5 mbar
reduced 0" - 3" w.c. / 0 - 7.5 mbar
Consult factory on valves for positive pressure applications.
Pressure Limits:Pressure Limits:
Pressure Limits:Pressure Limits:
Pressure Limits:
Maximum Discharge Pressure
(M411, M420, M511, M520, M620, M611) ... 7" w.c. / 17 mbar
(M420H, M520H, M620H) .......................... 11" w.c. / 27 mbar
(MR251, M451, M551, M651) ....................... 7"w.c. / 17 mbar
above low fire setting
Max. Operating Inlet Pressure (MR212) ........... 5.0 psi / 345 mbar
(M411, M420, M420H, M451, M511, M520, M520H,
M551, M611, M620, M620H M651) ............. 1.0 psi / 70 mbar
Max. Emergency Exposure* (MR212) ............ 12.5 psi / 860 mbar
(M411, M420, M420H, M451, M511, M520, M520H,
M551, M611, M620, M620H, M651)........... 3.0 psi / 210 mbar
*May not function properly at this pressure, but will suffer no
internal damage.
Power Supply:Power Supply:
Power Supply:Power Supply:
Power Supply:
24 VAC, 50/60 Hz Class II transformer
Gases:Gases:
Gases:Gases:
Gases: All fuel gases.
Vent:Vent:
Vent:Vent:
Vent:
Models M411, M420, M451, M511, M520, M551, M611, M620,