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107902-01D
9
9
For more information, visit www.desatech.com
For more information, visit www.desatech.com
INSTALLATION
Continued
INSTALLATION
Connecting To Gas Supply (Cont.)
Checking Gas Connections
Figure 13 - 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 Accessory, page 29.
We recommend that you install sediment trap in supply line as
shown in Figure 13. 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" Minimum
Natural Gas
From Gas Meter
(4" W.C. to 10.5"
W.C. Pressure)
Propane/LP
From External
Regulator
(11" W.C. to 14"
W.C. Pressure)
Equipment
Shutoff Valve*
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections
for leaks after installing or servicing. Correct all leaks
at once.
WARNING: Never use an open flame to check for
a leak. Apply a noncorrosive leak detection fluid to all
joints. Bubbles forming show a leak. Correct all leaks
at once.
CAUTION: For propane/LP gas, make sure exter-
nal regulator has been installed between propane/LP
supply and heater. See guidelines under
Connecting
to Gas Supply
, pages 8 and 9.
Pressure Testing Gas Supply Piping System
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance 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 equipment shutoff valve
was connected.
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 com-
pressed air.
4. Check all joints of gas supply piping system. Apply a noncorrosive
leak detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to gas supply.
Check reconnected fittings for leaks.
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 13).
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.