Trane Gas Unit Heaters Wartungshandbuch
GLND-SVX01B-EN
27
Start-Up
Operation
Power Vented Duct Furnaces with
Intermittent (Spark) Pilot Ignition
Intermittent (Spark) Pilot Ignition
Explanation of Controls
1.
The duct furnace is equipped with a dual automatic gas
valve and electric ignition device (separate from the
gas valve on most models) which provide the following
functions:
valve and electric ignition device (separate from the
gas valve on most models) which provide the following
functions:
a. The duct furnace is equipped with a power vent
system consisting of a power venter motor and
blower, pressure switch, and sealed flue collector in
place of the conventional draft diverter.
blower, pressure switch, and sealed flue collector in
place of the conventional draft diverter.
b. The power venter motor is energized by the room
thermostat on a call for heat. The pressure switch
measures the flow through the vent system and
energizes the indirect spark ignition system when
the flow is correct.
measures the flow through the vent system and
energizes the indirect spark ignition system when
the flow is correct.
c. The indirect spark ignition system consists of an
ignition control module, a dual combination gas
valve, and a spark-ignited pilot burner. When the
pressure switch closes, the pilot valve opens and a
spark is generated to light the pilot burner. When
the flame sensing circuit senses that pilot flame is
established, the main gas valve is opened to supply
gas to the main burners. When the thermostat is
satisfied, the vent system is de-energized and both
valves are closed to stop all flow of gas to the unit.
valve, and a spark-ignited pilot burner. When the
pressure switch closes, the pilot valve opens and a
spark is generated to light the pilot burner. When
the flame sensing circuit senses that pilot flame is
established, the main gas valve is opened to supply
gas to the main burners. When the thermostat is
satisfied, the vent system is de-energized and both
valves are closed to stop all flow of gas to the unit.
d. Pilot solenoid valve also functions as a main gas
valve to provide redundancy.
e. Pressure regulator provides proper and steady gas
pressure to the main burners.
f. Manual shutoff valve for service and long term
shut-down. (Separate from the automatic valve on
some models.)
some models.)
2. The high limit switch interrupts the flow of electric
current to the main gas valve in case the heater
becomes overheated.
becomes overheated.
3. The fan switch delays the operation of the fan until the
heater is warmed, then keeps the fan running after the
gas has been turned off until the useful heat has been
removed. The start-up fan delay must not exceed
90 seconds from a cold start.
gas has been turned off until the useful heat has been
removed. The start-up fan delay must not exceed
90 seconds from a cold start.
4. The wall thermostat (supplied optionally) is a
temperature sensitive switch which operates the vent
system and ignition system; it turns the main gas valve
ON or OFF to control the temperature of the space
being heated. It must be mounted on a vibration free,
vertical surface away from air currents, in accordance
with the instructions furnished with the thermostat
(also refer to
system and ignition system; it turns the main gas valve
ON or OFF to control the temperature of the space
being heated. It must be mounted on a vibration free,
vertical surface away from air currents, in accordance
with the instructions furnished with the thermostat
(also refer to
Start-Up
1.
Open the manual valve supplying gas to the unit
heater, and with the union connection loose, purge air
from the gas line. Tighten the union and check for gas
leaks, using a soapy water solution only.
heater, and with the union connection loose, purge air
from the gas line. Tighten the union and check for gas
leaks, using a soapy water solution only.
2. Open the manual valve on the unit heater.
3. Turn ON electrical power.
WARNING
Check and Test Safety Devices!
It is the installer’s responsibility to check all safety
controls! Check and test the operational functions of all
safety devices supplied with this unit, and ensure that
all are operating effectively. Failure to do so could result
in unsafe conditions and could result in death, serious
injury or property damage.
controls! Check and test the operational functions of all
safety devices supplied with this unit, and ensure that
all are operating effectively. Failure to do so could result
in unsafe conditions and could result in death, serious
injury or property damage.
NOTICE:
Operate Unit within Specified Units!
Never operate the unit beyond the specified limits,
severe damage to, and/or premature failure of the unit
will result!
severe damage to, and/or premature failure of the unit
will result!
WARNING
Risk of Fire and Carbon Monoxide
Poisoning!
Poisoning!
The pressure switch MUST NOT be bypassed. The unit
MUST NOT be fired unless the power venter is
operating. Failure to follow these recommendations
could result in death or serious injury.
MUST NOT be fired unless the power venter is
operating. Failure to follow these recommendations
could result in death or serious injury.
NOTICE:
Additional Devices!
The addition of external draft hoods or power venters is
not permitted. Addition of such devices could cause
severe unit malfunction or failure!
not permitted. Addition of such devices could cause
severe unit malfunction or failure!
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Before attempting
to light or relight the pilot, wait 5 minutes to allow gas
which may have accumulated in the burner
compartment to escape. Failure to follow
recommended safe leak test procedures or pilot
lighting/relighting instructions could result in death or
serious injury or equipment or property-only-damage.
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Before attempting
to light or relight the pilot, wait 5 minutes to allow gas
which may have accumulated in the burner
compartment to escape. Failure to follow
recommended safe leak test procedures or pilot
lighting/relighting instructions could result in death or
serious injury or equipment or property-only-damage.