INSTALLATION
Continued
IMPORTANT: Hold the pressure regulator with wrench when connecting it to gas pip- ing and/or fittings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.
| Pressure |
| Heater | ||
| Regulator |
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| Cabinet | |||
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| 3/8" NPT |
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| Pipe Nipple |
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Connection* | Bushing to | Ground Joint | |||
Union | |||||
| Tee Joint | ||||
| Equipment | ||||
| Reducer | ||||
| Shutoff | ||||
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Gauge | 1/8" NPT | Valve* | |||
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1/8" NPT |
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Test | Plug Tap |
| Natural Gas | ||
Trap |
| 3" | |||
Tee Joint | From Gas | ||||
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| Min. | Meter | ||
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| Pipe | |||
| Sediment |
| (4" W.C. to | ||
| Nipple | 10.5" W.C. Pressure) | |||
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| Cap |
| Propane/LP | |
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| From External Regulator | ||
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| (11" W.C. to 14" W.C. | ||
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| Pressure) | |
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| Figure 15 - Gas Connection | |||
*A CSA
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 detec- tion 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 equip- ment 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 located 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 fittings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1.Close equipment shutoff valve (see Fig- ure 16).
2.Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air.
Equipment | Open |
| |
Shutoff Valve |
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| Closed |
Figure 16 - Equipment Shutoff Valve
www.desatech.com | 13 |
