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For more information, visit www.desatech.com
12
INSTALLATION
Continued
INSTALLATION
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: For propane/LP gas, make sure exter-
nal regulator has been installed between propane/LP
supply and heater. See guidelines under
Connecting
to Gas Supply
, page 11.
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 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 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 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 com-
pressed air.
3. Check all joints from gas meter for natural gas (see Figure 17)
or propane/LP supply tank for propane/LP gas, to equipment
shutoff valve (see Figure 18). Apply a noncorrosive leak de-
tection fluid to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
CHECKING GAS CONNECTIONS
Figure 18 - Checking Gas Joints for Propane/LP Gas
Figure 16 - Equipment Shutoff Valve
Equipment
Shutoff
Valve
Propane/LP
Supply
Tank
Thermostat
Gas Valve
ON
POSIT
O
PO
Open
Closed
Equipment
Shutoff
Valve
Figure 17 - Checking Gas Joints for Natural Gas
Equipment
Shutoff
Valve
Gas
Meter
Thermostat
Gas Valve
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 16).
2. For natural gas open main gas valve located on or near gas
meter. For propane/LP gas open propane/LP supply tank valve.
3. Make sure control knob of heater is in the OFF position.
4. Check all joints from equipment shutoff valve to thermostat
gas valve (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, page 13 or 14 depending
on your model). Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appliance, page 14 or
15 depending on your model).
8. Replace front panel.