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111640-01B
12
For more information, visit www.desatech.com
For more information, visit www.desatech.com
WARNING: Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
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.
INSTALLATION
Continued
* Purchase the optional CSA design-certified equipment shutoff
valve from your dealer. See Accessories, page 26.
** Minimum inlet pressure for purpose of input adjustment.
Figure 14 - Gas Connection
Cap Pipe Tee
Nipple Joint
3" Minimum
Sediment Trap
Gas
Control
From External
Regulator (11"
W.C.** to 14"
W.C. Pressure)
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if
allowed by local
codes)
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
CAUTION: Make sure external regulator has been
installed between propane/LP supply and heater. See
guidelines under
Connecting to Gas Supply
, page 11.
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 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 fittings for leaks.
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 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 propane/LP supply tank to equipment
shutoff valve for propane/LP gas (see Figure 16, page 13)
or from gas meter to equipment shutoff valve for natural
gas (see Figure 17, page 13). Apply noncorrosive leak de-
tection fluid to gas joints. Bubbles forming show a leak.
4. Correct all leaks at once.
Figure 15 - Equipment Shutoff Valve
O
POSI
T
P
O
Open
Closed
Equipment
Shutoff
Valve
INSTALLATION
Connecting To Gas Supply (Cont.)
Checking Gas Connections
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 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.