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112157-01A
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For more information, visit www.desatech.com
For more information, visit www.desatech.com
INSTALLATION
Continued
INSTALLATION
Connecting To Gas Supply
Figure 22 - Gas Connection
* 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-certified equipment shutoff valve from
your dealer. See Accessories, page 29.
We recommend that you install sediment trap in supply line as
shown in Figure 22. 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.
IMPORTANT:
Hold pressure regulator with wrench when con-
necting it to gas piping and/or fittings. Do not over tighten pipe
connection to regulator. The regulator body could be damaged.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection*
Tee
Joint
Pipe
Nipple
Cap
Pressure
Regulator
Heater
Cabinet
3/8" NPT
Pipe Nipple
Ground
Joint Union
Sediment
Trap
3"
7.7 cm)
Minimum
Natural Gas
From Gas Meter
[
6/10,000 Btu/Hr (1.8/2.9 kW)
4" (10 cm) W.C. to
10.5" (26.7 cm) W.C.
Pressure]
20,000 Btu/Hr (5.9 kW)
5" (12.7 cm) W.C. to 10.5"
(26.7 cm) W.C. Pressure]
Propane/LP
From External Regulator
(11" (27.9 cm) W.C. to
14" (35.6 cm) W.C. Pressure)
Equipment
Shutoff Valve*
Installation must include 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 22).
IMPORTANT:
Install an equipment shutoff valve in an accessible
location. 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.
CONNECTING TO GAS SUPPLY
WARNING: This appliance requires a 3/8" NPT
(National Pipe Thread) inlet connection to the pres-
sure regulator.
WARNING: A qualified service person must con-
nect heater to gas supply. Follow all local codes.
WARNING: For natural gas, never connect heater to
private (non-utility) gas wells. This gas is commonly
known as wellhead gas.
IMPORTANT
: For natural gas, check gas line pressure before
connecting heater to gas line. Gas line pressure must be no greater than
10.5 inches (26.6 cm) of water. If gas line pressure is higher, heater
regulator damage could occur.
CAUTION: For propane/LP gas, never connect
heater directly to the propane/LP supply. This heater
requires an external regulator (not supplied). Install
the external regulator between the heater and pro-
pane/LP supply.
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 inches (28 and 35.5 cm)
of water. 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 21. Pointing the vent down protects it from
freezing rain or sleet.
CAUTION: Use only new, black iron or steel pipe.
Internally-tinned copper tubing may be used in cer-
tain areas. Check your local codes. Use pipe of large
enough diameter to allow proper gas volume to heater.
If pipe is too small, undue loss of volume will occur.
Propane/LP
Supply Tank
Figure 21 - External Regulator With Vent Pointing Down
(Propane/LP Systems Only)
External Regulator
Vent Pointing Down
Typical inlet pipe diameter for 20,000 btu/hr (5.9 kW) models - 3/8"
or greater.