Desa CGS2718P - Manual (Page 12)

107068-01F
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12
INSTALLATION
Connecting To Gas Supply (Cont.)
Checking Gas Connections
INSTALLATION
Continued
Installation must include a equipment shutoff valve, union, and
plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from heater (see Figure 14).
IMPORTANT: Install equipment shutoff valve in an accessible
location. The main gas valve is for turning on or shutting off the gas
to the appliance.
Check your building codes for any special requirements for locating
equipment shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male NPT threads. This will
prevent excess sealant from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
We recommend that you install sediment trap in supply line as
shown in Figure 14. Locate sediment trap where it is within reach for
cleaning. Install in piping system between fuel supply and heater.
Locate sediment trap where trapped matter is not likely to freeze. A
sediment trap traps moisture and contaminants. This keeps them
from going into heater controls. If sediment trap is not installed or
is installed wrong, heater may not run properly.
WARNING: Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
CAUTION: Avoid damage to regulator. Hold gas
regulator with wrench when connecting it to gas
piping and/or fittings.
Figure 14 - Gas Connection
* Purchase the optional CSA design-certified equipment shutoff
valve from your dealer. See Accessories, page 32.
** Minimum inlet pressure for purpose of input adjustment.
Tee Joint Cap Pipe Nipple
3" Minimum
Sediment Trap
Gas Regulator
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible Gas
Hose (if allowed
by local codes)
Natural
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
Propane/LP
From External
Regulator
(11" W.C.** to
14 " W.C.
Pressure
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. Pres-
sures 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 com-
mercial leak detection solution 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 15, page 13).
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 (natural gas) or propane/LP
supply to equipment shutoff valve (see Figure 16 or 17, page
13). Apply a commercial leak detection solution to all joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
WARNING: Never use an open flame to check for
a leak. Apply a commercial leak detection solution to
all joints. Bubbles forming show a leak. Correct all
leaks at once.
WARNING: Test all gas piping and connections ,
internal and external to unit, for leaks after installing
or servicing. Correct all leaks at once.
CAUTION: For propane/LP units, make sure ex-
ternal regulator has been installed between propane/
LP supply and heater. See guidelines under
Connect-
ing to Gas Supply, page 11.
CHECKING GAS CONNECTIONS