®
PROPANE/LP GAS RESIDENTIAL HEATERS
INSTALLATION
Continued
CONNECTING TO
GAS SUPPLY
WARNING: This appliance re- quires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator.
WARNING: A qualified service person must connect heater to gas supply. Follow all local codes.
CAUTION: A qualified service person must connect heater to gas supply. Follow all local codes. Never connect heater directly to the propane/LP supply. This heater requires an external regu- lator (not supplied). Install the external regulator between the heater and propane/LP supply.
CAUTION: Use only new, black iron or steel pipe. Inter-
Installation must include an equipment shutoff valve, union, and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 19).
IMPORTANT: Install an equipment shutoff valve in an accessible location. The equip- ment shutoff valve is for turning on or shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.
CAUTION: Use pipe joint seal- ant that is resistant to liquid pe- troleum (LP) gas.
We recommend that you install a sediment trap in supply line as shown in Figure 19. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. Locate sedi- ment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed wrong, heater may not run properly.
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings.
The installer must supply an external regu- lator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between 11 and 14 inches of water. If you do not reduce incom- ing gas pressure, heater regulator damage could occur. Install external regulator with the vent pointing down as shown in Figure
18.Pointing the vent down protects it from freezing rain or sleet.
Propane/LP
Supply Tank
External |
Regulator |
Test Gauge Connection *
Sediment Trap
Pressure
Regulator
3/8" NPT
Pipe Nipple 
Tee Joint
Reducer Bushing to 1/8" NPT
1/8" NPT Plug Tap
Tee Joint
Pipe Nipple
Cap
Note: Burner bracket not shown for clarity
Ground | Heater |
Union Joint | Cabinet |
Equipment
Shutoff Valve *
From External Regulator (11" W.C. to 14" W.C. Pressure)
3" Minimum
Vent |
Pointing |
Down |
Figure 18 - External Regulator with Vent Pointing Down
Figure 19 - Gas Connection
*An CSA
For more information, visit www.desatech.com | 12 | 107102 |