34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax 734.419.0209 • www.hamiltonengineering.com • LIT91127 REV 3/09
70. Replace the part; it cannot be repaired
71. Check the wiring
71. Check the entire system including the pump for blockage and scaling
71.
For descaling, see the special instructions. Contact Hamilton Engineering
for assistance at 800.968.5530
SERVICING
(TABLE 7-6) TROUBLESHOOTING THE FAULT (CONTINUED)
F. TO TURN OFF GAS TO THE APPLIANCE
1) Set the thermostat to lowest setting.
2) Turn off power switch on front of unit.
3) Turn off all electric power to the appliance if service is to be performed.
4) Turn gas shutoff valve clockwise to “off.” Handle will be horizontal. Do not force.
G. PUMP & WIRING CONTROL
The FMT 914 control board has an on-board relay for controlling the circulating pump. On a call for heat, the
pump will start, allowing the water ow switch circuit to be made and the pre-start diagnostic to continue. After
the call for heat has been satised, the pump will continue to run for the factory programmed period of time
(1 minute) and then shut off. For water heating applications an external temperature sensor must be mounted
in the water storage tank if the intermittent pump operation is used. For heating applications the call for heat
must come from an external source (room thermostat etc.). In both applications if a continuous pump operation
is desired, it may be specially factory programmed for that or the pump should be wired directly to an external
power supply.
The only restriction is the amount of pump electrical load that can be connected. The maximum wattage an
externally connected pump can draw is 650 watts. All standard pumps as supplied by Hamilton Engineering draw
550 watts or less.
The EVO control system has the ability to control up to three (3) or two (2) pumps and a diverting valve. For
details see EVO Congurations Manual (LIT91110) or contact Hamilton Engineering at 800.968.5530.
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