Weil-McLain PLUS-E017-A/1206 Verify water heater operation, Operating information, B4 Start-up

PLUS LINE  Indirect-Fired Water Heaters – Series 3

		gas
B4 Start-up —	Gas boilers only (continued)

[3180] (burner on, space heating) Once flame is proven and stable, the burner turns down to low fire for ap- proximately 2 minutes.

c.Verify flame failure operation by closing boiler manual gas valve to prevent gas flow. Open gas cock after testing.

•After this low fire period, the burner is allowed to modulate. Firing rate depends on actual outlet water temperature versus target temperature.

5.Allow boiler to bring water temperature to target temperature.

[6180] (target temperature reached) The burner will shut down. The blower will run in postpurge (see below), then turn off. The boiler circulator continues to run as long as there is a call for heat.

6.Lower room thermostat to stop call for heat.

[1180] (postpurge) When the room thermostat is satis- fied (call for heat ended), the burner turns off. The blower will continue for a 15-second postpurge, then turn off. (If another call for heat occurs, the boiler will

remain off for one minute before starting again, and the display will show [6180].)

[0180] (no call for heat) Boiler is now in standby mode (waiting for heat call).

7.Repeat above steps several times to verify opera- tion.

8.Return the room thermostat to normal setting.

Verify water heater operation

1.Reconnect PLUS aquastat wiring to boiler if neces- sary.

2.Turn off power to boiler at service switch.

3.Wait a few seconds, then turn on power to boiler.

[A180] (self-checkon power-up, for a few seconds) [0180] (no call for heat)

4.Raise PLUS aquastat above tank temperature, to call for heat.

[5180] (blower/circulator on) The blower and PLUS circu- lator energize and the control checks for air flow.

[1180] (prepurge) Blower speed will increase to igni- tion speed. The blower will run in prepurge for 10 seconds.

[2180] (ignition) After prepurge, the control module opens the gas valve and starts ignition spark.

a.If burner flame proves within 4.5 seconds, burner continues to fire. Burner will fire at start-up rate — 50% of maximum input — for about 10 seconds to allow flame to stabilize.

b.If burner flame does not prove within 4.5 sec- onds, control module attempts ignition sequence

again. Flame must prove within 5 attempts or control will lockout (display will show [E 02]).

[4180] (burner on, PLUS) Once flame is proven and stable, the burner is allowed to modulate. Firing rate depends on actual outlet water temperature versus target temperature.

5.Allow boiler to bring water temperature to target temperature.

[6180] (target temperature reached) The burner will shut down. The blower will run in postpurge (see below), then turn off. The PLUS circulator continues to run as long as there is a call for PLUS heating.

6.Lower PLUS aquastat to stop call for heat.

[1180] (postpurge) When the room thermostat is satisfied (call for heat ended), the burner turns off. The blower will continue for a 15-second postpurge, then turn off. (If another PLUS call for heat occurs, the boiler will begin the heating cycle immediately.)

[8180] (PLUS circulator run-on) The PLUS circulator continues to run for 30 seconds.

[0180] (no call for heat) Boiler is now in standby mode (waiting for heat call).

7.Repeat above steps several times to verify opera- tion.

8.Return the PLUS aquastat to normal setting.

Operating information

1.To check operating conditions (actual and target

temperatures, for example), see Gas Boiler

Manual for an explanation of the control module Information mode.

2.During normal operation (no shutdown or lock- out), the right 3 display digits show actual boiler outlet water temperature.

Replace jacket front door

Replace boiler jacket front door after installation or servicing. The boiler front door must be securely fastened to the boiler to prevent boiler from drawing air from inside the boiler room. This is particularly important if the boiler is located in the same room as other appli- ances. Failure to keep the door securely fastened could result in severe personal injury or death.

34 Part Number PLUS-E017-A/1206