PVI Industries SU-3 - Manual (Page 8)

8
PV500-56 06/12
6.7 Appliance Isolation During Gas Supply Piping Pressure
Warning: The gas valve must not be subjected to more than ½” psig (3.45 kPa). Subjecting the gas
valve to pressure above ½” psig (3.45 kPa) can damage the valve and can cause gas leaks or loss of
gas control, which can result in property damage, personal injury or death.
The burner must be isolated during gas leak tests. The burner and its combination gas valve must be
disconnected from the gas supply piping system during any pressure testing of that system at test pressures
in excess of ½” psig (3.45 kPa). The appliance must be isolated from the gas supply piping by closing its
individual manual shut off valve using the gas control knob on top of burner combination valve during any
pressure testing of the gas supply piping system at test pressures equal to or less than ½” psig (3.45 kPa).
Gas Burner Piping
(Piping upstream of burner combination gas valve supplied by others)
7 . SEQUENCE OF OPERATION - Honeywell S89F
 Limits
close.
 Blower motor starts as the 24 Volt transformer powers the airflow switch.
 When the airflow switch is proven, the S89F control initiates a pre-purge of approximately 34 seconds.
 At the end of the pre-purge, the spark is energized for 4 seconds. At the same time, the 24 Volt
transformer powers the gas valve, allowing the fuel to flow. (The combination gas valve contains two
separate automatic safety shutoff valves, a pressure regulator and a manual shutoff valve)
 Within 4 seconds, the flame should be established and proved. The spark will shut off and the control will
hold power to the gas valve until the limits open and the burner stops firing.
 If the flame is not established, the blower motor continuously runs.
To restart, power should be interrupted for five minutes. Then turn on the power to start this sequence again.
WARNING: Should overheat occur, shut off the manual gas shut off valve to control the appliance. Do
not shut off the control switch to the pump or blower, which provides burner cooling and post purge.
Failure to follow this warning may result in a fire or explosion, causing property damage, personal
injury or death.
En cas de surchauffe : (1) fermez la commande manuelle de gaz à l'appareil, (2) ne pas fermer la commande
de la pompe ou de la soufflerie.
THIS IS NOT PART OF
THE SU-3 BURNER
SU-3 GAS BURNER