Desa CDR3924NT - Manual (Page 13)

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INSTALLATION
Continued
We recommend that you install a sediment trap in
supply line as shown in Figure 13. 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.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or fittings.
Figure 13 - Gas Connection
Tee Cap Pipe
Joint
Nipple
3"
Minimum
Gas
Regulator
Propane/LP - From
External Regulator
(11" W.C.** to 14" W.C.
Pressure)
Natural - From Gas
Meter
(5" W.C.** to
10.5" W.C.
Pressure)
CSA Design-
Certified Equipment
Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Sediment Trap
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories , page 25.
**Minimum inlet pressure for purpose of input
adjustment.
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
after installing or servicing. Cor-
rect 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: Make sure exter-
nal regulator has been installed
between propane/LP supply
and heater. See guidelines un-
der 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 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
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.