Desa VYM27NR - Manual (Page 14)

www.desatech.com 108382-01G 14
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, 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 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 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 compressed air.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid to gas
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.
INSTALLATION
Continued
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 15).
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 to equipment
shutoff valve for natural gas or propane/LP
supply to equipment shutoff valve for propane/
LP (see Figure 16 or 17). Apply a noncorrosive
leak detection fluid to gas joints. Bubbles
forming show a leak.
4. Correct all leaks at once.
Figure 17 - Checking Gas Joints for
Propane/LP Gas
Control Valve
Location
Propane/LP
Supply Tank Equipment Shutoff Valve
Figure 16 - Checking Gas Joints for
Natural Gas
Gas Meter
Equipment Shutoff Valve
Control Valve
Location
Figure 15 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve