Desa VN20BTB Safety Information And Installation Manual page 13

INsTallaTIoN
Continued
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 detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: For propane/LP
gas, make sure external regula-
tor has been installed between
propane/LP supply and heater.
See guidelines under Connect-
ing to Gas Supply, page 11.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(14" w.c.)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment
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 equip-
ment 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 compressed 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.
Equipment
Shutoff
Valve
Figure 16 - Equipment Shutoff Valve
121880-01B
Test Pressures Equal To or Less Than
1/2 PSIG (14" w.c.)
1. Close equipment shutoff valve (see Fig-
2. Pressurize supply piping system by either
3. Check all joints from gas meter for natural
4. Correct all leaks at once.
Propane/LP
Supply Tank
PRESSURE TESTING HEATER GAS
Open
CONNECTIONS
1. Open equipment shutoff valve (see
2. For natural gas open main gas valve locat-
Closed
www.desatech.com
ure 16).
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 compressed air.
gas (see Figure 17) or propane/LP supply
tank for propane/LP gas, to equipment
shutoff valve (see Figure 18). Apply a non-
corrosive leak detection fluid to all joints.
Bubbles forming show a leak.
Thermostat Gas Valve
Gas
Meter
Equipment Shutoff Valve
Figure 17 - Checking Gas Joints for
Natural Gas
Equipment Shutoff Valve
Figure 18 - Checking Gas Joints for
Propane/LP Gas
Figure 16).
ed on or near gas meter. For propane/LP
gas open propane/LP supply tank valve.
Thermostat
Gas Valve
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