Checking Gas Connections - Procom MNSD2TPA Owner's Operation And Installation Manual

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.
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
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 15 - Gas Connection
* Purchase the optional CSA design-certified equipment
shutoff valve from your dealer.
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks at once.
1. Disconnect heater with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping sys-
tem. Pressures in excess of 1/2 PSIG will
damage heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
200218-01A
INSTALLATION

CHECKING GAS CONNECTIONS

Pressure Testing Gas Supply Piping System
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
www.usaprocom.com
the vent pointing down as shown in Figure
16. Pointing the vent down protects it from
freezing rain or sleet.
Install sediment trap in supply line as shown
in Figure 15. 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 (7" W.C.
to 9" W.C.
Pressure)
Propane/LP
From External
Regulator (11" W.C.
to 14" W.C. Pressure)
3" Minimum
WARNING: Never use an
open flame to check for a leak.
Apply a mixture of liquid soap
and water to all joints. If bubbles
form, there is a leak. Correct all
leaks at once.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
Propane/LP
Supply Tank
Figure 16 - External Regulator
with Vent Pointing Down
External
Regulator with
Vent Pointing
Down
17