SECTION 14: O
PERATION
AND
M
AINTENANCE
51
SECTION 14: OPERATION AND MAINTENANCE
The heater is equipped with a direct-spark ignition
system.
14.1 Sequence of Operation
1. Turn the thermostat up. When the thermostat
calls for heat, the pump will start immediately.
After a short period, the burners will begin their
ignition sequence. Sparking will begin at the
electrodes and the gas valve will be energized
45 seconds later.
2. The flame will be sensed by the flame sensing
rod and the electrode is de-energized.
3. If a flame is detected, the gas valve
remains open. When the call for heat is
satisfied, the burner shuts off. On CRV-Series
systems equipped with the optional ROBERTS
GORDON
®
System Control, or ROBERTS
GORDON
®
ULTRAVAC
TM
, the pump will
continue operation for a post-purge period of
two minutes.
4. If no flame is detected, the module will close and
a purge period begins. If a flame is not
established, a second purge and warm-up will
take place and then a third trial cycle will begin.
After three trials, the module will lockout for one
hour or until reset.
5. A reset is accomplished by removing power
from the module for at least 5 seconds (thermo-
stat cycle is required) or automatically after 1
hour.
14.2 To Shut Off Heater
Set thermostat to lowest setting.
Turn OFF electric power to heater.
Turn OFF manual gas valve in the heater supply line.
14.3 To Start Heater
Turn gas valve and electric power OFF and wait five
minutes for unburned gases to vent from heater.
Turn ON main gas valve.
Turn ON electric power.
Set thermostat to desired temperature.
Burner should light automatically.
14.4 Pre-Season Maintenance and Annual
Inspection
To ensure your safety and years of trouble-free
operation of the heating system, service and annual
inspections must be done by a contractor qualified in
the installation and service of gas-fired heating
equipment.
Turn off gas and electric supplies before performing
service or maintenance. Allow heater to cool before
servicing.
Before every heating season, a contractor qualified in
the installation and service of gas-fired heating
equipment must perform a thorough safety
inspection of the heater.
For best performance, the gas, electrical, thermostat
connections, tubing, venting, suspensions and
overall heater condition should be thoroughly
inspected.
NOTE:
Gas flow and burner ignition are among the
first things that should be inspected.
Please
see Page 52, Section 14.5
for suggested
items to inspect.
WARNING
Explosion Hazard
Service and annual inspection must be done by a
contractor qualified in the installation and service of
gas-fired heating equipment or your gas supplier.
Turn off gas and electrical supplies before performing
service or maintenance.
Failure to follow these instructions can result in death,
injury or property damage.
