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ManualsBrandsMaxitrol ManualsHeating SuppliesRemote Temperature Selector w/ Dial (50° to 90°F)

Series 92 Electronic Gas Modulation System

See Bulletin MMR_MT_EN for additional M/MR valve information

NOTE: Low Fire Adjustment should be checked whenever High

Fire Adjustment is changed.

High Fire Adjustments

Rotate selector dial to maximum temperature setting.

NOTE: Voltage to the valve must be at least 18VDC.

Adjust separate pressure regulator to obtain desired manifold

pressure.

Low Fire Adjustments

Disconnect a wire from M valve terminal block.

NOTE: Be careful not to allow wire to come in contact with any

other part.

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

screwdriver to desired low re adjustment. (See Figure 1)

NOTE: Clockwise Screw rotation reduces ow rate. Do not

overtighten.

VALVE ADJUSTMENT

Ambient Limits

Operating: 32° to 131°F (0° to 55°C)

Non Operating: -4° to 158°F (-20° to 70°C)

Modications

Models M420, M520, M620 are available as “W” models -

indicates covered wire terminal connections.

Models M420, M520, M620 are available with side pressure

tap for reading outlet pressure - on side opposite of minimum

adjustment mechanism.

Valve Mounting

Valve must be mounted in upright position in horizontal pipe run,

downstream of all other controls except high pressure cut-off

switch if used.

Optional T115 Room Override Thermostat

As an optional component, an independent room override

adjustment can be provided to permit setting of the override

temperature from 0° to 40°F above the TD92 setpoint. The

T115 override thermostat senses room temperature and resets

the discharge air to a higher temperature whenever the sensed

temperature falls below the T115 setting.

The standard conguration is to connect the T115 override

thermostat to the TD92 remote temperature dial. In some cases

it may be more convenient to connect the T115 to the A1092

amplier. The T115 may be connected directly by removing the

jumper on the amplier’s input terminal block and connecting

the T115 in its place. The jumper must then be installed across

the TD92’s override terminals for proper operation. See Wiring

Diagrams (Figures 2 - 8).

SPECIFICATIONS (cont.)

Figure 1: Valve Adjustment

WIRING DIAGRAMS

Figure 2: Standard Connection of A1092 without Override Thermostat

JUMPER NOT REQUIRED ACROSS

TERMINALS 11 & 12