For Changing From Propane To Natural Gas Supply; – Gas Connection - Procom FBD400T-C User Manual

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 inch 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-inch NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater
(see Figure 7).
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.
CAUTION: Use pipe joint sealant that is resistant to gas (PROPANE or NG). We recommend that you install a
sediment trap in a supply line as shown in Figure 7. Locate sediment trap where it is within reach for cleaning and
not likely to freeze. Install in the piping system between fuel supply and heater. A sediment trap traps moisture
and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed
incorrectly, heater may not run properly.
CAUTION: Avoid damage to regulator. Hold gas regulator with wrench when connecting into gas piping and/or
fittings. NG Models: 5 in. to 10.5 in. W.C. Gas supplier provide external regulator for natural gas.
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Purchase the optional CSA design-certified equipment shut off valve from your dealer. See "Accessories".
CAUTION: Two gas line installations at the same time are forbidden. You are not allowed to open the cover while the
machine is running.
Heater is pre-set at factory for propane gas, no changes are required for connecting to propane. Only a qualified installer
or service technician can perform gas selection and connecting to gas supply.
CAUTION: To avoid gas leakage at the inlet of regulator, a qualified installer or service technician must use steel
or metal hex plug with sealant.

For changing from propane to natural gas supply

1. Remove bottom screw from cover plate, see Figure 8, and rotate to expose gas selection valve.
2. For NATURAL GAS, press in knob using a flat screwdriver with a blade the width of a quarter and turn knob
clockwise until the knob locks into the NG position (see Figure 9). Selection valve must be locked into the NG
position. Do not operate heater between locked positions!
3. Rotate and close cover over gas selection valve and reinstall screw.
4. Remove steel or metal hex plug (with wrench provided) from natural gas inlet of regulator and install into LP inlet of
regulator, use thread sealant to assure there are no leaks.
Figure 7 – Gas Connection
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