Procom PCNSDS24RT Manual page 16

Typical Inlet Pipe Diameters
Use 1/2" 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.
For propane installations, 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 regula-
tor. The external regulator will reduce incom-
ing gas pressure. You must reduce incoming
gas pressure to between 11" WC and 14" WC.
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 15. Pointing the vent down
protects it from freezing rain or sleet.
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.
16
INSTALLATION
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.
ing and connections for leaks
after installing or servicing.
Correct all leaks at once (see
page 17).
Flexible Gas
Hose (if allowed
by local codes)
Figure 13 - Attaching Flexible Gas Hose
3/8" NPT
Pipe Nipple
Equipment
Shutoff Valve
Natural Gas
From Gas Meter
(5" W.C.** to
9.5" W.C.
Pressure)
Propane
From External
Regulator
(11" W.C.**
to 14" W.C.
3" Minimum
Pressure)
www.usaprocom.com
WARNING: Test all gas pip-
Fitting
to Heater Gas Regulator
Propane
Supply Tank
Figure 15 - External Regulator
with Vent Pointing Down
L P
PR ES SU RE
IN LE T G AS
IG (3 .5 KP A)
M AX 1/ 2 PS
G as es té
G as In le t
N G
Heater Gas
Regulator
External
Regulator with
Vent Pointing
Down
200240-01C