Instructions For Operation - Maytag HN41240P User Manual

Series twelve power vent gas water heater
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Instructions for Operation
This water heater is equipped with an electrically operated
_
VENTING MANUAL
venting system and electronic control. For the burner to come
BLOWER MOTOR
RESET S WITCH
on, the water heater thermostat must call for heat. Then the
NN, _
system will begin sequencing, each section proving itself
before gas is allowed to flow to the burner.
I
DRAFT HOOD
BEFORETHE WATER HEATER WILL OPERATE:
1. The control system must be connected to a grounded
ON/OFF SWITCH
AIRPRESSURE
110/120 volt power supply. The control system has an
_
1_........._ _/SWITCH
overall rating of 2 amps. The water heater must be secure-
ly and adequately grounded in accordance with local codes
and with the latest edition of the National Electrical Code
ANSI/NFPA
70.
2. The ON/OFF
toggle swatch, located on the control box
OR
above the thermostat must be in the "ON" position for the
BLOWER MOTOR
electrical control system to operate allowing the gas por-
/_-_
J
VENTING MANUAL
tion to operate (ignite burner).
RESET S WITCH
3. The gas control knob located on the thermostat must be
turned to the "ON" position for the gas to be able to flow.
DRAFT HOOD,,,,@/
--
_J
4. The venting manual reset switch must be in the closed
position. See "Venting Manual Reset Switch" in the
"Troubleshooting"
section.
5. There is a non-resettable hi-limit switch in the thermo-
ON/OFFSWITCH
AIRPRESSURE
stat, which must be good (closed) for the thermostat to be
NNN_
[_.....
oT,,.,,*_*,-eeu
operated. See "High Temperature Shut Off System" in the
"Troubleshooting"
section.
OPERATION
M_
_
GASCONTROL
When the thermostat calls for heat, gasis allowed to flow to
j _-_l_._
KNOB
a (N/O) pressure switch closing it. An electrical circuit is
then made to the blower, turning it on. When the blower has
achieved sufficient venting, the air pressure switch will close.
A 120 volt circuit will be completed through the venting
DIAGNOSTIC f
_
_
_
120VGASVALVE
manual reset switch and on to the 120 volt gas valve. The 120
INDICATOR
volt gas valve will open allowing gas to flow to the
burner.
/_
/BURNER
The hot surface ignitor will establish a main burner flame.
_
/
GAS THERMOSTAT
IGNITOR
29

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