17
CONNECTING TO GAS SUPPLY
WARNING
: A qualified service technician must connect heater to gas supply. Follow all local
codes.
CAUTION:
Never connect heater directly to the gas supply. This heater requires an external
regulator (not supplied). The external regulator between the gas supply and heater must be installed.
Gas supplier provides external regulator for natural gas.
WARNING
: Never connect heater to private (non-utility) gas wells. This gas is commonly known
as wellhead gas.
The installer must supply an external regulator for liquid propane. The external regulator is
provided by the gas supplier for natural gas. The external regulator will reduce incoming gas pres-
sure. You must reduce incoming gas pressure to between 11 and 14 in. of water column for propane
and between 6 and 7 in. of water column for natural gas. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install external regulator with the vent pointing down as
shown in Fig. 15. Pointing the vent down protects it from freezing rain or sleet.
* Purchase the optional equipment shutoff valve from your local Home Center store.
INSTALLATION
CAUTION
: Use only new black iron or steel pipe. Internally tinned copper tubing
may be used in certain areas. Check your local codes. Use pipe of ½ in. diameter
or greater to allow proper volume gas to heater. If pipe is too small, loss of pressure
will occur. Installation must include an equipment shutoff valve, union, and plugged
1/8-in. NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must
be upstream from heater (See Fig. 15).
IMPORTANT
: Install 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 threads. This will prevent excess sealant from going into pipe.
Excess sealant in pipe could result in clogged heater valves.
Approved
Flexible
Gas Line
or 1/2''
Black Pipe
Fig. 14 - Regulator Conversion
Fig. 15 - Gas Connection
7''
(5.5''
Fig. 13 - Selector Valve
Summary of Contents for VFL-CO18DT
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