Install Instructions

Valve Adjustments

(

See bulletin MT2035 for additional M/MR valve information

)

NOTE: NOTE:

NOTE: Low Fire Adjustment should be checked whenever High Fire Adjustment is changed.

High Fire Adjustments:High Fire Adjustments:

High Fire Adjustments:

Rotate selector dial to maximum temperature setting.

NOTE:

Voltage to the valve must be at least 18VDC.

M411, M420, M511, M520, M611, and M620 -

Adjust separate pressure regulator to obtain desired manifold pressure.

M451, M551, and M651 -

Adjust separate pressure regulator to obtain desired manifold pressure.

MR212D, E, and G - MR251D, E, and G - (

see figure 1

)

Remove cap (A) and turn regulator pressure adjusting screw to obtain

desired manifold pressure. Clockwise rotation increases pressure.

M411, M420, M511, M520, M611, and M620 - (

see figure 2

)

Remove by-pass cap (A) and turn screw (B) using small screwdriver to desired

low fire adjustment.

NOTE: Clockwise screw rotation reduces flow rate. Do not overtighten.

Low Fire Adjustments:Low Fire Adjustments:

Low Fire Adjustments: Disconnect a wire from M or MR valve terminal

block.

NOTE: Be careful not to allow wire to come into contact with any other part.

MR212D, E, and G - (

see figure 1

)

Remove cap (B) from by-pass metering valve and loosen lock screw (C).

Turn adjusting screw (D) to desired low fire adjustment.

M451, M551, M651 - MR251D, E, G, - (

see figure

)

Remove cover plate (A). Using minimum adjusting screw (B), set manifold

pressure to manufacturer's specifications.

igure 1

igure 2

igure 3