4 Gas connections
Connecting gas supply piping
1.Remove the top access panel and refer to FIG.’s
a.Install ground joint union for servicing, when required.
b.Install a manual shutoff valve in the gas supply piping outside boiler jacket when required by local codes or utility requirements.
2.Install sediment trap / drip leg.
Figure 4-1 Gas Supply Piping - Model 400
UNION
GAS SUPPLY
Outdoor Knight XL Installation & Operation Manual
Figure 4-3 Gas Supply Piping - Models 601 - 801
GAS SUPPLY
MANUAL SHUTOFF VALVE (FACTORY SUPPLIED)
IMG00328
SEDIMENT TRAP / DRIP LEG
3. Support piping with hangers, not by the boiler or its accessories.
SEDIMENT TRAP /
DRIP LEG
MANUAL SHUTOFF VALVE (FIELD SUPPLIED)
WARNING
The gas valve and blower will not support the weight of the piping. Do not attempt to support the weight of the piping with the boiler or its accessories. Failure to comply could result in severe personal injury, death, or substantial property damage.
IMG00411
Figure 4-2 Gas Supply Piping - Model 501
UNION (FACTORY INSTALLED)
GAS SUPPLY
SEDIMENT TRAP/
DRIP LEG
MANUAL SHUTOFF VALVE (FACTORY SUPPLIED)
IMG00410
24 
4.Purge all air from the gas supply piping.
5.Before placing the boiler in operation, check the boiler and its gas connection for leaks.
a.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).
b.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).
c.The appliance and its gas connection must be leak tested before placing it in operation.
WARNING Do not check for gas leaks with an open flame – use the bubble test. Failure to
use the bubble test or check for gas leaks can cause severe personal injury, death, or substantial property damage.
6.Use pipe sealing compound compatible with propane gases. Apply sparingly only to male threads of the pipe joints so that pipe dope does not block gas flow.
