110373-01B
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For more information, visit www.desatech.com
7
7
INSTALLATION
Connecting to Portable Cylinder Gas Supply (Cont.)
Connecting To Permanent Gas Supply
INSTALLATION
Continued
WARNING: A qualified service person must con-
nect heater to gas supply. Follow all local codes.
CAUTION: Never connect heater directly to the
propane/LP supply. This heater requires an external
regulator (not supplied). Install the external regulator
between the heater and propane/LP supply.
WARNING: This appliance requires a 3/8" NPT
(National Pipe Thread) inlet connection to the pres-
sure regulator.
CONNECTING TO PERMANENT GAS SUPPLY
If installing to a fixed fuel piping system, the installation must
conform with local codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1.
If the heater will be connected to a permanent gas source, the installer
must supply an external regulator. The external regulator will reduce
incoming gas pressure. You must reduce incoming gas pressure to
between 11 and 14 inches of water. If you do not reduce incoming gas
pressure, heater regulator damage could occur. Install the external
regulator with the vent pointing down as shown in Figure 12. Pointing
the vent down protects it from freezing rain or sleet.
Installation Items
Before installing heater, make sure you have the items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge connection. The
optional CSA design-certified equipment shutoff valve can be
purchased from your dealer. See Accessories, page 18.
WARNING: Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
Installation must include 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 13, page 8).
IMPORTANT:
Install an equipment shutoff valve in an accessible
location. The equipment shutoff valve is for turning on or shutting
off the gas to the appliance.
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.
CAUTION: Use only new, black iron or steel pipe.
Internally-tinned copper tubing may be used in certain
areas. Check your local codes. Use pipe of large
enough diameter to allow proper gas volume to heater.
If pipe is too small, undue loss of volume will occur.
Figure 12 - External Regulator With Vent Pointing Down
External
Regulator
Propane/LP
Supply
Tank
Vent
Pointing
Down
7. Open propane/LP supply valve on propane/LP tank(s) slowly.
Note:
If not opened slowly, excess-flow check valve on pro-
pane/LP tank may stop gas flow. If this happens, close pro-
pane/LP supply valve and open again slowly.
8. Check all connections for leaks. Apply a noncorrosive leak
detection fluid to gas joints. Bubbles forming show a leak that
must be corrected.
9. Close propane/LP supply valve.
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