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INSTALLATION
14
Checking Gas Connections
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 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 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 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
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.
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 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.
3.
Check all joints from gas meter for natural or propane/LP sup-
ply to equipment shutoff valve (see Figure 17 or 18). Apply a
noncorrosive leak detection fluid to all joints. Bubbles form-
ing show a leak.
4.
Correct all leaks at once.
For more information, visit www.desatech.com
For more information, visit www.desatech.com
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 16).
2. Open main gas valve located on or near gas meter for natural
gas or open propane/LP supply tank valve.
3. Make sure control knobs of heater are in the OFF position.
4.
Check all joints from equipment shutoff valve to thermostat gas
valve (Thermostat-Controlled Models) or control valve (Remote-
Ready Models) (see Figure 17 or 18). Apply a noncorrosive leak
detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6.
Light heater (see Operating Heater, pages 18 through 22).
Check all other internal joints for leaks.
7.
Turn off heater (see To Turn Off Gas to Appliance, page 19 [Ther-
mostat-Controlled Models] or page 21 [Remote-Ready Models]).
Equipment
Shutoff
Valve
Figure 16 - Equipment Shutoff Valve
Equipment Shutoff Valve
Propane/LP
Supply Tank
Figure 17 - Checking Gas Joints (Propane/LP only)
Equipment Shutoff Valve
Gas Meter
Figure 18 - Checking Gas Joints (Natural Gas only)
Open
ON
POSITION
OFF
Closed
POSITION
Thermostat Gas Valve or
Control Valve Location
Thermostat Gas Valve or
Control Valve Location
108114
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