Low Water Cutoff (Lwco) - Standard C-More Test; Shutting The Heating Boiler Down For An Extended Period Of Time - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
LWCO Capacitor Integrity Test – Continued
5. Confirm that the ohmmeter does NOT read a short.
If the ohmmeter reads a short, the capacitor assembly needs to be
replaced.
6. Remove both ohmmeter probes and reconnect the Shell Harness connector to the P5
connector on the rear of the C-More controller.

7.9.2 Low Water Cutoff (LWCO) - Standard C-More Test

Perform the standard Low Water Cutoff test using the C-More controls as described below.
Standard Low Water Cutoff C-More Test
1. Turn the AC power to the unit to the ON position.
2. Press the TEST switch on the C-More controller and confirm that the blinking LOW
WATER LEVEL message appears on the C-More display within 4 seconds.
3. Press the RESET key, followed by the Clear button, and confirm that the LOW WATER
LEVEL message is cleared.
7.10 SHUTTING THE HEATING BOILER DOWN FOR AN EXTENDED PERIOD OF
TIME
If the Heating Boiler is to be taken out of service for an extended period of time (one year or
more), the following instructions must be followed.
Shutting Heating Boiler Down for Extended Period
1. Set ON/OFF switch on the front panel to the OFF position to shut down the Heating
Boiler's operating controls.
2. Disconnect AC power from the unit.
3. Close the water supply and return valves to isolate Heating Boiler.
4. Close external gas supply valve.
5. Open relief valve to vent water pressure.
6. Open the drain valve to drain water from the unit.
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CHAPTER 7 – MAINTENANCE
NOTE
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 97 of 170
11/03/2016