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110373-01B
For more information, visit www.desatech.com
For more information, visit www.desatech.com
8
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 (con-
trol valve) and equipment shutoff valve from gas supply pip-
ing system. 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 opening propane/LP supply
tank valve or using compressed air.
4. Check all joints of gas supply piping system. Apply a noncor-
rosive 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.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 14).
2. Pressurize supply piping system by either opening propane/LP
supply tank valve or using compressed air.
Figure 14 - Equipment Shutoff Valve
O
POSI
PO
Open
Closed
Equipment
Shutoff
Valve
INSTALLATION
Continued
INSTALLATION
Connecting To Permanent Gas Supply (Cont.)
Checking Gas Connections For Permanent Gas Supply
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection*
Heater
Cabinet
Pressure
Regulator
Tee Joint
Pipe Nipple
Cap
Ground
Joint
Union
3/8" NPT
Pipe Nipple**
Equipment Shutoff
Valve *
From External
Regulator
(11" W.C. to
14" W.C.
Pressure)
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: Make sure external regulator has been
installed between propane/LP supply and heater. See
guidelines under
Connecting to Permanent Gas Sup-
ply
, pages 7 and 8.
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 Accessories, page 18.
** The 90º elbow on the regulator is removed and the 3/8" NPT pipe
nipple is installed in its place.
Sediment
Trap
3" Minimum
CONNECTING TO PERMANENT GAS SUPPLY
(CONTINUED)
CHECKING GAS CONNECTIONS FOR
PERMANENT GAS SUPPLY
Install sediment trap in supply line as shown in Figure 13. Locate
sediment trap where it is within reach for cleaning. 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 the pressure regulator with wrench when
connecting it to gas piping and/or fittings. Do not over tighten pipe
connection to regulator. The regulator body could be damaged.