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Part number IWHA016A/1103
12
PLUS Line Instruction Manual Supplement
PLUS &
PLUS WATER HEATERS WITH GAS-FIRED WATER BOILERS
4
[3180] (burner on, space heating) Once flame is proven
and stable, the burner turns down to low fire for
approximately 2 minutes.
• 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 satisfied
(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
operation.
8. Return the room thermostat to normal setting.
Verify operation — PLUS water
heater
1. Reconnect PLUS aquastat wiring to boiler if
necessary.
2. Turn off power to boiler at service switch.
3. Wait a few seconds, then turn on power to boiler.
[A180] (self-check on 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
circulator energize and the control checks for air flow.
[1180] (prepurge) Blower speed will increase to ignition
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 seconds,
control module attempts ignition sequence again.
Flame must prove within 5 attempts or control
will lockout (display will show [E 02]).
c. Verify flame failure operation by closing boiler
manual gas valve to prevent gas flow. Open gas
cock after testing.
[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
operation.
8. Return the PLUS aquastat to normal setting.
Operating information
1. To check operating conditions (actual and target
temperatures, for example), see page 40 in Ultra
Boiler Manual for an explanation of the Ultra
control module Information mode.
2. During normal operation (no shutdown or
lockout), the right 3 display digits show actual boiler
outlet water temperature.
Replace boiler 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
appliances. Failure to keep the door
securely fastened could result in severe
personal injury or death.
Start-up (continued)