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17. LIGHTING INSTRUCTIONS
Refer to the lighting instructions on the outside
cover of the burner housing. Again, if the unit
locks out on safety, main power to the unit must
be manually interrupted for a 30 second reset
period before the heater can be restarted.
18. RECOMMENDED MAINTENANCE
Inspect the venting system each heating sea-
son and repair or replace worn parts as re-
quired.
Check the inlet air opening and the blower
periodically, cleaning off any lint or foreign
matter, as it is important that the flow of
THE STV-JZ TUBE HEATER BURNER IS COMPLETELY FACTORY ASSEMBLED AND
TESTED. ANY ALTERATION VOIDS THE CSA CERTIFICATION AND MANUFACTURER'S
WARRANTY. FOR ADDITIONAL INFORMATION, CONTACT YOUR LOCAL DISTRIBU-
TOR OR MANUFACTURER.
19. SEQUENCE OF OPERATION - HONEYWELL S87J1034
STV-JZ Burner with direct spark ignition, is as follows : options #1 #2
Option #1: (120 volts)
Upon a call for heat by the line volt
age Thermostat or "ON/OFF" switch, the
blower is activated, closing a normally open
contact in the blower pressure switch
Option #2: (24 volts)
Upon a call for heat by the 24 volt Thermostat
or ON/OFF switch, the 24 volt relay will ener-
gize, closing the normally open contact to the
blower.
With the blower pressure switch contact
closed, the 30 second pre-purge cycle on
the DSI control is activated. The Spark is
energized and the gas valve opens.
NOTE:
On initial installation, the unit may lock
out on safety owing to the length of time
required to bleed air from the gas piping
.
system
combustion and ventilation air must not be ob-
structed.
In addition we recommend the entire system
be checked once a year by a qualified service
technician.
Once the flame sensor determines that
there is a flame, the spark igniter is
de-energized.
In the event ignition does not occur, the
safety circuit will function to interrupt gas
flow after approximately 21 seconds and
lock the system out. No further gas will
flow until the power has been manually in-
terrupted for a period of 30 seconds. This
will reset the ignition module and the operat-
ing sequence will restart at step #3.
If the blower does not run, the blower
pressure switch (normally open contact)
does not close and power is not supplied to
the ignition control.
Page 23
GP-MSJV-BX-07A
STV-JZ Manual
RD: MAR 2009
RL: 07A - BA
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