INSTALLATION
Continued
WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
We recommend that you install a sediment trap in supply line as shown in Figure 7. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. 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.
CAUTION: Avoid damage to regulator. Hold gas regulator with wrench when connecting it to gas piping and/or fittings.
Propane/LP
From External Regulator (11" W.C.** to 14" W.C. Pressure)
Natural
From Gas Meter (5" W.C.** to 10.5" W.C. 
Pressure)
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip- ing and connections, internal and external or 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: Make sure exter- nal regulator has been installed between propane/LP supply and heater. See guidelines under Connecting to Gas Supply, pages 9 and 10.
Pressure Testing Gas Supply Piping System
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect heater with its appliance main gas |
valve (control valve) and equipment shutoff |
valve from gas supply piping system. Pres- |
sures in excess of 1/2 psig will damage heater |
Sediment Trap
Tee 
Joint
Pipe
Nipple
Cap
3"
Min
Approved | Gas | |
Flexible Gas | ||
Regulator |
Hose (if allowed of Heater by local codes)
| 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, opening main gas valve lo- |
| cated on or near gas meter for natural gas, or |
| using compressed air. |
Figure 7 - Gas Connection
*Purchase the optional CSA
**Minimum inlet pressure for purpose of input adjustment.
4. | Check all joints of gas supply piping system. |
| Apply noncorrosive leak detection fluid to gas |
| 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. |
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1.Close equipment shutoff valve (see Figure 8, page 11).
10 | www.desatech.com |
