INSTALLATION
Connecting To Gas Supply
11
INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
Typical Inlet Pipe Diameters
WARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection to the pres- sure regulator.
WARNING: A qualified service person must con- nect heater to gas supply. Follow all local codes.
WARNING: For natural gas, never connect heater to private
IMPORTANT: For natural gas, check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water. If gas line pressure is higher, heater regulator damage could occur.
CAUTION: For propane/LP gas, never connect heater directly to the propane/LP supply. This heater requires an external regulator (not supplied). Install the external regulator between the heater and pro- pane/LP supply.
For propane/LP gas, the installer must supply an external regulator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between 11 and 14 inches of water. If you do not reduce incoming gas pressure, heater regulator damage could occur. Install the external regulator with the vent pointing down as shown in Figure 14. Pointing the vent down protects it from freezing rain or sleet.
VN18(T), VP16(T), VN18IT, and VP16IT - 3/8" or greater VN30(T), VP26(T), VN25IT, and VP22IT - 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 sealant that is resistant to liquid petroleum (LP) gas.
We recommend that you install a sediment trap in supply line as shown in Figure 15. 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.
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 Regulator
Regulator Bracket
Propane/LP | External |
| Heater Cabinet |
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Regulator |
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| 3/8" NPT Pipe Nipple | ||
Supply |
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| Tee Joint | Ground Joint Union | |
Tank | Test |
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| Reducer | ||||
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| Gauge |
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| Bushing to |
| Equipment | ||
| Connection* |
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| 1/8" NPT |
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| Vent |
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| Shutoff Valve * | |
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| 1/8" NPT |
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| Natural Gas | ||
| Pointing |
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| Plug Tap |
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| Down |
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| From Gas Meter | |
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| Tee Joint |
| (7" W.C. to 10.5" W.C. |
Figure 14 - External Regulator With Vent Pointing Down |
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Sediment Pipe Nipple |
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| 3" | Propane/LP | |||
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| Trap | Cap | |||
CAUTION: Use only new, black iron or steel pipe. |
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| Minimum | From External | ||
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| Regulator | ||
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| Figure 15 - Gas Connection |
| (11" W.C. to 14" W.C. | |||
areas. Check your local codes. Use pipe of large |
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| Pressure) | ||||
enough diameter to allow proper gas volume to heater. |
| * A CSA | ||||
If pipe is too small, undue loss of volume will occur. |
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| tap is an acceptable alternative to test gauge connection. Purchase | |||||
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| the optional CSA | |||
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| your dealer. See Accessories, page 30. |
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