Desa SVYD18N - Manual (Page 12)

111162-01A
12
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* Purchase the optional CSA design-certified equipment shutoff
valve from your dealer. See Accessories, page 35.
** Minimum inlet pressure for purpose of input adjustment.
Figure 21 - Gas Connection (SVYD18PR/NR and FSVYD18PR/NR
Series)
3" Minimum
Sediment Trap
Gas Control
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Cap Pipe Tee
Nipple Joint
INSTALLATION
Continued
3" Minimum
Gas Regulator
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible Gas
Hose (if allowed
by local codes)
Figure 22 - Gas Connection (SVYD18P/N and FSVYD18P/N
Series)
Sediment Trap
Tee Pipe Cap
Joint Nipple
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)
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)
CAUTION: Avoid damage to regulator. Hold gas
regulator with wrench when connecting it to gas
piping and/or fittings.
We recommend that you install a sediment trap in supply line as
shown in Figures 21 and 22. 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: 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.
WARNING: Test all gas piping and connections,
internal and external to unit, for leaks after installing
or servicing. Correct all leaks at once.
CHECKING GAS CONNECTIONS
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 sys-
tem. 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 sup-
ply 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.
4. Check all joints of gas supply piping system. Apply a noncor-
rosive 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 fittings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 23, page 13).
2. Pressurize supply piping system by either opening propane/LP sup-
ply 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 for natural or propane/LP sup-
ply to equipment shutoff valve (see Figures 24 or 25, page
13). Apply a noncorrosive leak detection fluid to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
CAUTION: Make sure external regulator has been
installed between propane/LP supply and heater. See
guidelines under
Connecting to Gas Supply, page 11.
INSTALLATION
Connecting to Gas Supply (Cont.)
Checking Gas Connections