Desa CGD3018PT/NT - Manual (Page 15)

www.desatech.com 111160-01C 15
INSTALLATION
Continued
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under Con-
necting to Gas Supply
, page 14.
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 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 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 fit-
tings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG
(3.5 kPa)
1. Close equipment shutoff valve (see Figure 17).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve lo-
cated on or near gas meter for natural gas, or
using compressed air.
3. Check all joints from gas meter to equipment
shutoff valve for natural gas or propane/LP sup-
ply to equipment shutoff valve for propane/LP
(see Figures 18 and 19). Apply noncorrosive
leak detection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 17).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP sup-
ply tank valve.
ON
POSITION
OFF
POSITION
Figure 17 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve
Figure 18 - Checking Gas Joints
(Propane/LP Gas Models)
Equipment
Shutoff Valve Propane/LP
Supply Tank
Thermostat Gas Valve or
Control Valve Location
Figure 19 - Checking Gas Joints (Natural
Gas Models)
Gas Meter
Equipment
Shutoff Valve
Thermostat Gas Valve or
Control Valve Location
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from equipment shutoff valve
to thermostat gas valve (Thermostat-Con-
trolled Models), to control valve (Manually-
Controlled Models), or to gas control (Re-
mote-Ready Models) (see Figures 18 and 19).
Apply 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 20
and 21 [manually-controlled models] or pages
22 and 23 [thermostatically-controlled mod-
els]). Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 21 [manually-controlled models] or
page 23 [thermostatically-controlled models]).