62 Direct-Fired Make-up Air • MUA-SVX01A-EN
Maintenance
M411, 511, 611 Valve - High Fire Manifold Adjustments
1. Disconnect wires from amplifier terminal #4 (MDT controls), or #2 and #4
(MRT controls). This will cause the valve to call for continuous high fire.
2. Adjust the pressure regulator to obtain the desired manifold pressure (7"
W.C. maximum).
3. Reconnect the wires to amplifier.
MR212 Valve - Low Fire Manifold Adjustments
1. Disconnect wires from amplifier terminal #8. This will cause the valve to call
for continuous low fire.
2. Remove seal cap (A) and turn adjusting screw (B) to desired low fire
adjustment (Clockwise rotation reduces minimum flow rate).
3. Replace cab (A) and reconnect wire to amplifier terminal #8.
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