Trane DFIA, Установка, эксплуатация и обслуживание

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MUA-SVX01A-EN • Direct-Fired Make-up Air
75
Trouble Shooting
WARNING
Combustible
Materials!
Maintain proper clearance between the unit heat exchanger, vent surfaces and
combustible materials. Refer to unit nameplate and installation instructions for
proper clearances. Improper clearances could result in a fire hazard. Failure to
maintain proper clearances could result in death or serious injury or property
damage.
Operation of the Direct Spark Ignition Control Gas Valve
On a call for heat, a 5-second prepurge is initiated. Upon completion of the
prepurge, the gas valve and 60 HZ spark are energized. When flame is detected,
the control enters the steady state heating condition. Steady state heating will
continue until the call for heat is satisfied.
If ignition is not achieved within 10-seconds, the control valve shuts off the gas
and locks out. If the trial for ignition has been accomplished without ignition, the
control shuts off all outputs and enters lockout. Reset is accomplished by cycling
the power off for a minimum of 5-seconds.
If flame is lost once it has been established, the control will shut off the gas valve
within 0.8 seconds and locks out.
If flame is sensed during a purge period when no flame should be present, the
control will remain in a purge with the gas valve off until the false flame
disappears.
If the gas valve is found to be powered when it should be off, or not powered
when it should be on, the control will enter lockout with all outputs off. Reset is
accomplished by cycling the power off for a minimum of 5-seconds.
Two Stage Valve
Two stage models require a check and adjust for both high and low pressure
regulator settings. Two stage appliance operating sequences vary. Consult the
valve manufacturer instructions for the specific operating sequence and
regulator adjustment procedure in which the control is installed.
1. Set the appliance to operate on high.
2. Carefully check the main burner light (off). Make sure that the main burner
lights smoothly and that all ports remain lit.
3. Check the full rate (high) manifold pressure listed on the appliance nameplate
for high pressure. The gas control full rate outlet pressure should match this
rating.
4. With the main burner operating, check the gas control flow rate using the
meter clocking method or check the pressure using a manometer connected
to the outlet pressure tap on the gas control.
5. If necessary, adjust the high pressure regulator to match the appliance rating.
– remove the pressure regulator adjustment cap.
Gas Control Valve