Procom SN250TYLA-D - Manual (Page 7)

7
CONNECTING TO GAS SUPPLY
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
CAUTION: Never connect heater
directly to the gas supply. This heater
requires an external regulator (not
supplied). lnstall the external regulator
between the heater and gas supply.
INSTALLATION ITEMS NEEDED
Before installing heater, make sure you
have the items listed below.
piping (check local codes)
sealant (resistant to natural or propane/
LP gas)
equipment shutoff valve*
test gauge connection*
sediment trap
see joint
pipe wrench
flexible gas hose (check local codes)
* A CSA design-certified equipment shutoff
valve with 1/8
" NPT tap is an acceptable
alternative to test gauge connection.
Purchase the optional CSA design-cer-
tified equipment shutoff valve and flex
hose from your dealer. See Accessories,
page 14.
Figure 7 -Gas Connection
The installer must supply an external
regulator. The external regulator will re-
duce incoming gas pressure. You must
reduce incoming gas pressure to between
11 to 14
inches. If you do not reduce in-
coming gas pressure, heater regulator dam-
age could occur. lnstall external regulator
with the vent pointing down as shown in
Figure 6. Pointing the vent down protects
it from freezing rain or sleet.
* Purchase the optional CSA design-certified equipment shutoff valve and flex hose from
your dealer. See Accessories, page 14.
** 11” W.C. pressure is the minimum inlet pressure for purpose of input adjustment.
INSTALLATION
Continued
WARNING: Never connect heater
to private (non-utility) gas wells. This gas
is commonly known as wellhead gas.
CAUTION: Only use a new black
iron or steel pipe. Internally-tinned cop-
per tubing may be used in certain areas.
Check your local codes. Use pipe of 1/
2 " diameter or greater to allow proper
gas volume to heater. If pipe is too
small, undue loss of pressure will occur.
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 up-
stream from heater (see Figure 7).
IMPORTANT: Install 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 seal-
ant from going into pipe. Excess sealant
in pipe could result in clogged heater
valves.
CAUTION: Use pipe joint sealant
that is resistant to liquid petroleum(LP)
gas.
We recommend that you install a sedi-
ment trap in supply line as shown in
Figure 7. Locate sediment trap where it is
within reach for cleaning. Install in piping
system between fuel supply and heater.
Locate sediment trap where trapped mat-
ter is not likely to freeze. A sediment trap
traps moisture and contaminants. This
keeps them from going into heater
controls. If sediment trap is not in-
stalled 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” to 10.5” W.C.
Gas supplier provides external regula-
tor for natural gas.
Figure 6- External Regulator
With Vent Pointing Down
Figure 5-Gas Regulator Location and
Gas Line Access Into Heater Cabinet
Front View
Side View
Gas Regulator
Inlet Connection
Front
of
heater
unit
’’