Wayne HSG200 Manual - page 10
PAGE 9
SECTION III
OPERATION AND TROUBLESHOOTING
SEQUENCE OF OPERATION - HSG SERIES POWER GAS
CONVERSION BURNER UTILIZING HONEYWELL S89F
GAS PRIMARY P/N 62759-002 W/BUILT IN 30 SECOND PREPURGE
On a call for heat, voltage (24V) is applied to motor start
relay and air switch. Once the fan motor reaches
operating rpm combustion air pressure is sensed by the
air proving switch and closes the switch contacts
energizing the S89F gas primary control.
THE S89F gas primary control has an internal 30
second prepurge timer. After the initial 30 second
prepurge, an internal 8 second safe start check of the
S89F will commence. Once this is successfully
completed, the S89F simultaneously energizes the gas
valve and ignition transformer. Gas flows and the
transformer produces an approximate 7300 volt spark
end point grounded at the burner head establishing
main burner flame.
At the start of each heat cycle, there is a trial for ignition
period of four (4) seconds duration. Normally, burner
flame will be established before the end of this period.
Once the flame is established, sparking will cease and
the flame rod will provide flame monitoring to the S89F
gas control primary for the remainder of the heat cycle.
If the flame should be extinguished during the heat
cycle, the S89F gas control primary will go into the 30
second prepurge and 8 second safe start check, then
re-energize the gas valve and ignition transformer in an
attempt to establish the main burner flame. If this does
not occur within the 4 second trial for ignition period, the
S89F gas primary control will go into lockout de-
energizing the gas valve and ignition transformer.
To restart the system, the main power or thermostat
must be de-energized momentarily, then re-energized.
If at any time during the heat cycle, there is an
insufficient supply of combustion air to the burner, the
air switch will open, putting the system into lockout
closing the gas valve.
HSG POWER GAS BURNER
WITH HONEYWELL S89F GAS PRIMARY