Filter
Top Products
www.desatech.com
114744-01C
14
CAUTION: Use only new,
black iron or steel pipe. Inter
-
nally-tinned copper 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
volume 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 upstream from heater (see Figure 14).
IMPORTANT: Install equipment shutoff valve in
an accessible location within 6 feet of the appli
-
ance. The equipment shutoff valve is for turning
on or shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 14. Locate sediment
trap where it is within reach for cleaning. Install
in piping system between fuel supply and heater.
Locate sediment trap where trapped matter 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 installed or
is installed wrong, heater may not run properly.
CAUTION: Avoid damage to
gas control. Hold gas control
with wrench when connecting it
to gas piping and/or fittings.
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks at once.
INSTALLATION
Continued
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 27.
**Minimum inlet pressure for purpose of input
adjustment.
Figure 14 - Gas Connection (Remote-
Ready Models Only)
To Gas
Control
Valve
3" Minimum
Sediment Trap
Propane/LP - From
External Regulator
(11" W.C.** To 14"
W.C. Pressure)
Natural - From
Gas Meter (5"
W.C.** to
10.5" W.C.
Pressure)
CSA Design-
Certified
Equipment
Shutoff Valve
With 1/8" NPT
Tap*
Approved Flexible Gas
Hose (if allowed by
local codes)
Tee Pipe Cap
Joint Nipple
For propane/LP units, 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 incoming gas pressure,
heater control valve damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 13. Pointing the vent down
protects it from freezing rain or sleet.
Propane/LP
Supply Tank
External
Regulator
Figure 13 - External Regulator With Vent
Pointing Down
Vent
Pointing
Down