INSTALLATION
Continued
CAUTION:Useonlynew,black
IMPORTANT: Hold the pressure regulator with wrench when connecting it to gas piping and/or fittings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.
copper tubing may be used in cer- tainareas.Checkyourlocalcodes. Usepipeoflargeenoughdiameter to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.
Typical Inlet Pipe Diameters VN20BT, VP20BT - 3/8" or greater
VN30BT, VP30BT - 1/2" or greater
Installation must include 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 15).
IMPORTANT: Install an equipment shutoff valve in an accessible location. The equipment shutoff valve is for turning on or shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male NPT threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.
WARNING: Use pipe joint
| Pressure | |
| Regulator | |
3/8" NPT | ||
Pipe Nipple | ||
Connection* | Tee Joint | |
| ||
| Reducer | |
| Bushing | |
Gauge | to 1/8" | |
NPT | ||
| ||
| 1/8" NPT | |
Test | Plug Tap | |
| ||
Trap | Tee Joint | |
Pipe | ||
Sediment | ||
Nipple | ||
| ||
| Cap | |
Note: Burner bracket not shown for clarity
Heater Cabinet
Ground Joint
Union
Equipment
Shutoff
Valve *
3" Min.
Natural Gas From Gas Meter (4" W.C. to 10.5" W.C. Pressure) Propane/LP From External Regulator (11" W.C. to 14" W.C. Pressure)
sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown in Figure 15. Locate sediment trap where it is within reach for cleaning. Locate sediment 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.
| External |
Propane/LP | Regulator |
Supply Tank |
|
Vent
Pointing
Down
Figure 14 - External Regulator With Vent
Pointing Down
Figure 15 - Gas Connection
*A CSA
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections for leaks after installing or servicing. Correct all leaks at once.
WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak detec- tion fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.
12 | www.desatech.com |