Roberts Gorden COMPLETE HED Series, Installation, Operation & Service Manual

Page: 57 / 72

SECTION 11: O
PERATION AND
M
AINTENANCE
51
SECTION 11: OPERATION AND MAINTENANCE
This heater is eq u ipped w ith a direct spark ignition
system.
11.1 Se q uence of Operation
4. T u rn the thermostat u p. When the thermostat
calls for heat, the blo w er motor w ill energize.
5. When the motor approaches nominal r u nning
RPM, the press u re s w itch closes and acti v ates
the ignition mod u le.
6. After a 45 second prep u rge, the ignition mod u le
then opens the gas v al v e and energizes the
spark igniter.
7. When the flame is established, the sparking
seq u ence ceases.
8. If the flame is not established d u ring the ignition
seq u ence, the ignition mod u le closes the gas
v al v e and p u rge begins. Mod u le w ill try 2
additional times for ignition ( w ith p u rges in
bet w een trials). If ignition is not established, the
mod u le w ill locko u t.
9. If the flame exting u ishes d u ring operation, the
ignition mod u le w ill attempt the m u ltiple trial
seq u ence described in step 5. If ignition is not
re-established, the mod u le w ill locko u t for one
ho u r or u ntil reset.
10.After locko u t, the control can be reset by t u rning
do w n thermostat for fi v e seconds, and then
raising it again to desired temperat u re, or by
disconnecting po w er and then reconnecting.
11. When thermostat is satisfied, all po w er to the
u nit is sh u t off.
11.2 To Shut Off Heater
Set thermostat to lo w est setting.
T u rn OFF electric po w er to heater.
T u rn OFF man u al gas v al v e in the heater s u pply line.
11.3 To Start Heater
T u rn gas v al v e and electric po w er OFF and w ait fi v e
min u tes for u nb u rned gases to v ent from heater.
T u rn ON main gas v al v e.
T u rn ON electric po w er.
Set thermostat to desired temperat u re. B u rner
sho u ld light a u tomatically.
11.4 Pre-Season Maintenance and Annual
Inspection
To ens u re yo u r safety and years of tro u ble-free oper-
ation of the heating system, ser v ice and ann u al
inspections m u st be done by a contractor q u alified in
the installation and ser v ice of gas-fired heating
eq u ipment.
T u rn off gas and electric s u pplies before performing
ser v ice or maintenance. Allo w heater to cool before
ser v icing.
Before e v ery heating season, a contractor q u alified in
the installation and ser v ice of gas-fired heating
eq u ipment m u st perform a thoro u gh safety inspec-
tion of the heater.
For best performance, the gas, electrical, thermostat
connections, t
u bing, v enting, s u spensions and o v er-
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.