Desa GMP16 - Manual (Page 13)

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INSTALLATION
Continued
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from go-
ing 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.
Install sediment trap in supply line as shown in
Figure 15, page 12. Locate sediment trap where it
is within reach for cleaning. Locate sediment trap
where trapped matter is not likely to freeze. A sedi-
ment trap traps moisture and contaminants. This
keeps them from going into heater controls. If sedi-
ment 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.
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak de-
tection fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under Con-
necting to Gas Supply
, page 12.
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 system. Pressures in ex-
cess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by opening
propane/LP supply tank valve 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.
Test Pressures Equal To or Less Than 1/2
PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 16).
2. Pressurize supply piping system by opening
propane/LP supply tank valve or using com-
pressed air.
3. Check all joints from propane/LP supply tank
to equipment shutoff valve (see Figure 17).
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
Figure 16 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve
Figure 17 - Checking Gas Joints for
Propane/LP Gas
Equipment Shutoff Valve
Propane/LP
Supply Tank
Thermostat Gas Valve