12
INSTALLATION
Connecting to Gas Supply (Cont.) Checking Gas Connections
INSTALLATION
Continued
We recommend that you install a sediment trap in supply line as shown in Figures 21 and 22. 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.
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections, internal and external to unit, 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 detection fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.
CSA
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible Gas Hose (if allowed by local codes)
3" Minimum 
Cap Pipe
Nipple
Gas Control
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)
Tee
Joint
CAUTION: Make sure external regulator has been installed between propane/LP supply and heater. See guidelines under Connecting to Gas Supply, page 11.
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 sys- |
| tem. Pressures in excess of 1/2 psig will damage heater regulator. |
2. | Cap off open end of gas pipe where equipment shutoff valve |
| was connected. |
3. | Pressurize supply piping system by either opening propane/LP sup- |
| ply tank valve for propane/LP gas or opening main gas valve lo- |
Sediment Trap
Figure 21 - Gas Connection (SVYD18PR/NR and FSVYD18PR/NR Series)
PROPANE/LP |
| CSA | ||
| Equipment Shutoff Valve | |||
From External |
| |||
| With 1/8" NPT Tap* | |||
Regulator (11" |
| |||
|
|
| ||
W.C. to 14" |
|
|
| |
W.C. Pressure) |
|
|
| |
NATURAL |
|
|
| |
From Gas |
|
| Approved | |
Meter (5" W.C. |
|
| ||
to 10.5" W.C. |
| 3" Minimum | Flexible Gas | |
Pressure) |
| Hose (if allowed | ||
Tee | Pipe | Cap | by local codes) | |
Gas Regulator | ||||
Joint | Nipple |
| ||
Sediment Trap
Figure 22 - Gas Connection (SVYD18P/N and FSVYD18P/N Series)
*Purchase the optional CSA
**Minimum inlet pressure for purpose of input adjustment.
| cated on or near gas meter for natural gas, or using compressed air. |
4. | Check all joints of gas supply piping system. Apply a noncor- |
| rosive 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 fittings for leaks. |
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1.Close equipment shutoff valve (see Figure 23, page 13).
2.Pressurize supply piping system by either opening propane/LP sup- ply 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.
3.Check all joints from gas meter for natural or propane/LP sup- ply to equipment shutoff valve (see Figures 24 or 25, page 13). Apply a noncorrosive leak detection fluid to gas joints. Bubbles forming show a leak.
4.Correct all leaks at once.
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