INSTALLATION
Continued
WARNING: Use pipe joint 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.
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.
Pressure | Heater | ||
Regulator | Cabinet | ||
| 3/8" NPT |
| |
Connection* | Pipe Nipple |
| |
Bushing to | Shutoff | ||
|
|
| Ground Joint |
| Tee Joint | Union | |
| Reducer | Equipment | |
Gauge | 1/8" NPT | Valve * | |
1/8" NPT |
| ||
|
| ||
Test | Plug Tap | 3" Min. | |
Trap | Tee Joint | ||
|
| ||
|
|
| |
| Sediment | Pipe | to 10.5" W.C. Pressure) |
| Nipple | ||
|
| Natural Gas | |
|
| Cap | |
|
| From Gas Meter (4" W.C. | |
Propane/LP
From External Regulator (11" W.C. to 14" W.C. Pressure)
Figure 15 - Gas Connection
*A CSA
your dealer. See Accessories, page 30.
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip- ing and connections, internal and external to unit, for leaks after installing or servicing. Cor- rect all leaks at once.
WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak de- tection fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.
CAUTION: For propane/LP gas, make sure external regula- tor has been installed between propane/LP supply and heater. See guidelines under Connect- ing to Gas Supply, page 12.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1.Disconnect appliance with its appliance main gas valve (control valve) and equipment shutoff valve from gas supply piping system. Pressures in excess of 1/2 psig will damage heater regulator.
2.Cap off open end of gas pipe where equip- ment shutoff valve was connected.
3.Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve lo- cated on or near gas meter for natural gas, or using compressed air.
4.Check all joints of gas supply piping system. Apply a noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.
5.Correct all leaks at once.
6.Reconnect heater and equipment shutoff valve to gas supply. Check reconnected fit- tings for leaks.
www.desatech.com | 13 |