Desa VS30PRA - Manual (Page 12)

12 104417
UNVENTED PROPANE/LP GAS LOG HEATER
DESA INTERNATIONAL
ON
POSITI
O
POSI
Open
Closed
Manual
Shutoff
Valve
Pressure Testing gas Supply
Piping system
Test Pressures In Excess Of 1/2 PSIG
1. Disconnect heater and its individual
manual shutoff valve from gas supply
piping system. Pressures in excess of
1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where
manual shutoff valve was connected.
3. Pressurize supply piping system by ei-
ther using compressed air or
opening propane supply tank valve.
4. Check all joints of gas supply piping
system. Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Reconnect heater and manual shutoff
valve to gas supply. Check reconnected
fittings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG
1. Close manual shutoff valve (see Fig-
ure 15).
2. Pressurize supply piping system by ei-
ther using compressed air or opening
propane supply tank valve.
3. Check all joints from propane supply
tank to manual shutoff valve (see Fig-
ure 16). Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
INSTALLATION
Continued
Figure 15 - Manual Shutoff Valve
Figure 16 - Checking Gas Joints
WARNING: Never use an open
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming
show a leak. Correct all leaks at
once.
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
CHECKING GAS
CONNECTIONS
CAUTION: Make sure exter-
nal regulator has been installed
between propane supply and
heater. See guidelines under
Con-
necting to Gas Supply, page 11.
Pressure Testing Heater Gas
Connections
1. Open manual shutoff valve (see Fig-
ure 15).
2. Open propane supply tank valve.
3. Make sure control knob of heater is in
the OFF position.
4. Check all joints from manual shutoff
valve to gas control (see Figure 16). Ap-
ply mixture of liquid soap and water to
gas joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater,
pages 14 through 16). Check all other
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 15).
CAUTION: Use pipe joint seal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Install sediment trap in supply line as shown
in Figure 14, page 11. 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 mois-
ture 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.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
Manual Shutoff Valve
Propane
Supply
Tank
Control Valve
Location