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Typical Inlet Pipe Diameters
Use 3/8" black iron pipe or greater. Installa-
tion 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 14).
IMPORTANT: Install an equipment shutoff
valve in an accessible location. The equip-
ment 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.
Ground
Joint Union
Tee Joint
Reducer
Bushing to
Test Gauge
1/8" NPT
Connection*
1/8" NPT
Plug Tap
Tee Joint
Sediment
Pipe Nipple
Trap
Gap
Figure 14 - Gas Connection
* Purchase the optional CSA design-certified equipment
shutoff valve from your dealer.
14
INSTALLATION
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" of water. If you do not reduce incom-
ing gas pressure, heater regulator damage
could occur. Install external regulator with
the vent pointing down as shown in Figure
15. Pointing the vent down protects it from
freezing rain or sleet.
Install sediment trap in supply line as shown
in Figure 14. Place sediment trap where it is
within reach for cleaning. Place sediment trap
where trapped matter is not likely to freeze.
A sediment trap traps moisture and contami-
nants. This keeps them from going into heater
controls. If sediment trap is not installed or is
installed wrong, heater may not run properly.
3/8" NPT
Pipe Nipple
Equipment
Shutoff Valve
Natural Gas
From Gas
Meter (5" W.C.
to 9.5" W.C.
Pressure)
Propane/LP
From External
Regulator (11" W.C.
to 14" W.C. Pressure)
3" Miniumum
www.usaprocom.com
External
Regulator with
Vent Pointing
Propane/LP
Down
Supply Tank
Figure 15 - External Regulator
with Vent Pointing Down
200233-01B
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Do you have a question about the MNSD300HGA and is the answer not in the manual?
Questions and answers
I cant get the pilot light to light I followed the instructions correctly ??
To troubleshoot the pilot light issue on a Procom MNSD300HGA:
1. Check Gas Supply – Ensure the equipment shutoff valve is fully open.
2. Follow Lighting Instructions – Turn the control knob to OFF, wait five minutes, then try lighting the pilot again by pressing the ignitor button.
3. Manual Lighting – If the ignitor does not work, light the pilot with a match following the Manual Lighting Procedure (page 18).
4. Hold Control Knob – After lighting, keep the control knob pressed for 30 seconds.
5. Check Gas Pressure – If the pilot does not stay lit, gas pressure may be too low. Contact your gas supplier.
6. Consult Troubleshooting Guide – Refer to pages 20-24 for additional troubleshooting steps.
7. Seek Professional Help – If the issue persists, contact a qualified service technician or gas supplier for repairs.
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