Procom ML100HBAHR Owner's Operation And Installation Manual page 14

CAUTION: Never connect
heater directly to the gas supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between
the heater and gas supply. Gas
supplier provides external regula-
tor for natural gas. The installer
provides the external regulator
for propane/LP gas.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting
into gas piping and/or fittings.
CAUTION: Use pipe joint
sealant that is resistant to gas.
Before installing heater, make sure you have
the items listed below:
• external regulator for propane/LP unit only
(supplied by installer)
• piping (check local codes)
Pressure
Regulator
Ground
Joint
Union
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Tee
Joint
Sediment
Pipe
Trap
Nipple
Cap
Figure 15 - Gas Connection
* Purchase the optional CSA design-certified equipment
shutoff valve from your dealer.
14
INSTALLATION
• sealant (resistant to natural gas and pro-
pane/LP gas)
• equipment shutoff valve*
• test gauge connection*
• sediment trap
• tee joint
• pipe wrench
• flexible gas hose (check local codes)
* A CSA design-certified equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design certified equipment
shutoff valve from your dealer.
Heaters up to 20,000 BTU/hr use 3/8" black
iron pipe or greater. Installation must include
an 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 threads.
This will prevent excess sealant from going
into pipe. Excess sealant in pipe could result
in clogged heater valves.
The installer must supply an external regulator. The
external regulator will reduce incoming gas pres-
sure. You must reduce incoming gas pressure to
between 11" and 14" of water. If you do not reduce
incoming gas pressure, heater regulator damage
could occur. Install external regulator with the vent
pointing down as shown in Figure 16. Pointing the
vent down protects it from freezing rain or sleet.
3/8" NPT
Pipe Nipple
Equipment
Shutoff Valve
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
3" Min.
www.usaprocom.com
Typical Inlet Pipe Diameters
External Regulator with
Vent Pointing Down
Propane/LP
Supply Tank
Figure 16 - External Regulator
with Vent Pointing Down
200052-01B