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Operating Instructions (cont'd)
Operating
AWARNING
BEFORE OPERATING [PROPANE (L.P.) GAS
WATER HEATERS]: Propane (L.P.) gas is heavier
than air. Should there be a leak in the system, the gas
will settle near the ground. Basements, crawl spaces,
skirted areas under mobile homes (even when venti-
lated), closets and areas below ground level will serve
as pockets for the accumulation of this gas. Before
attempting to operate the water heater or turning
on a nearby electrical light switch, be absolutely sure
there is no accumulated gas in the area. Search for
odor of gas by sniffing at ground level in the vicinity
of the appliance. If odor is detected, follow steps indi-
cated at "For Your Safety" on the cover page of this
manual then leave the premises.
Operating instructions are located on front of the water heater,
above or to one side of the gas control valve. See page 28.
_,WARNING
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
FOR YOUR SAFETY
IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
4. The burner heats the water to the desired thermostat setting.
a) The resistance in the thermostat rises to the value
selected by the temperature control knob.
b) The control module doses the gas valve and 5 seconds
later, removes power from the blower.
5. Cycle is completed.
CONTROL SEQUENCE - HOT SURFACE DIRECT IGNITION
Pre-purge 5 sec.
HSI Warm-up 20 sec.
Ignition Activation Period 4 sec.
Flame Recognition Period Isec.
Ignition Trial 4 sec.
lnterpurge 5 sec.
Post-purge 5 sec.
Retries 2
Resetfrom Lockout I hr.
FlameSensing(Nominal)
HSI Off/Run Mode 4.0 pa DC
CHECK FOR LEAKS
Be sure to check all your gas pipes for leaks before operating
your water heater. Use a soapy water solution, not a match or
open flame. Check the factory gas fittings when the main burner
is turned "ON".
WATER HEATING IGNITION SEQUENCE
(Make sure gas and electric power are connected
properly)
1. The ignition control module is powered and monitors the sys-
tem, waiting for a call for heat from the thermostat.
2. The thermostat calls for heat by reading a resistance value
within a given range directly proportional to water tempera-
ture.
3. The control module:
a) Checks the pressure switch for an open circuit.
b) Energizes the blower.
c) Checks the pressure switch for a closed circuit to prove
draft.
d) Sends line voltage to the hot surface igniter with a 20-
second warm up period.
e) Opens the gas valve and checks the sensing rod for
flame.
27