Checking Gas Connections - Desa FLAME-MAX VML27PR Owner's Operation And Installation Manual

INSTALLATION
12
Connecting To Gas Supply (Cont.)

Checking Gas Connections

INSTALLATION
Continued
Installation must include an 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 19).
IMPORTANT: Install equipment shutoff valve in an accessible
location. The equipment shutoff 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.
WARNING: Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
We recommend that you install sediment trap in supply line as
shown in Figure 19. 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 control. Hold fitting
with wrench when connecting it to gas piping and/or
fittings.
Propane/LP
Supply Tank
Figure 18 - External Regulator With Vent Pointing Down (pro-
pane/LP gas only)
External
Regulator
Vent
Pointing
Down
For more information, visit www.desatech.com
For more information, visit www.desatech.com
CSA Design-
Certified Equipment
Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Gas Control
Figure 19 - Gas Connection
* Purchase the optional CSA design-certified equipment shutoff
valve from your dealer. See Accessories, page 27.
** Minimum inlet pressure for purpose of input adjustment.
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 detection fluid to
all joints. Bubbles forming show a leak. Correct all
leaks at once.
CAUTION: For propane/LP gas, make sure exter-
nal regulator has been installed between propane/LP
supply and heater. See guidelines under Connecting
to Gas Supply , pages 11 and 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 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.
Natural Gas
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
Propane/LP Gas
From External
Regulator (11"
W.C.** to 14" W.C.
Pressure)
Tee
Joint
3" Minimum
Pipe
Nipple
Cap
Sediment
Trap
111115-01D