Desa CLD3924NTB Electric Heater User Manual


 
www.desatech.com 113101-01A
14
Installation Items Needed
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 *
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. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 30.
For propane/LP gas, the installer must supply an
external regulator. The external regulator will re-
duce incoming gas pressure. You must reduce in-
coming gas pressure to between 11 and 14 inches
of water. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down as
shown in Figure 13. Pointing the vent down pro-
tects it from freezing rain or sleet.
CAUTION: Use only new, black
iron or steel pipe. Internally-tinned
copper tubing may be used in cer-
tain areas. Check your local codes.
Use pipe of 1/2" diameter or greater
to allow proper gas volume to
heater. If pipe is too small, undue
loss of volume will occur.
INSTALLATION
Continued
Figure 13 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
Vent
Pointing
Down
Installation must include a 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 14).
IMPORTANT:
Install equipment shutoff valve in
an accessible location. The main gas valve is for
turning on or shutting off the gas to the appliance.
Check your building codes for any special re-
quirements for locating equipment shutoff valve
to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from go-
ing 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 14. Locate sediment
trap where it is within reach for cleaning. Install in
piping system between fuel supply and heater. Lo-
cate sediment trap where trapped matter is not likely
to freeze. A sediment trap traps moisture and con-
taminants. This keeps them from going into heater
controls. If sediment trap is not installed or is in-
stalled 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 14 - Gas Connection
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 30.
** Min. inlet pressure for purpose of input adjustment.
Tee Cap Pipe
Joint Nipple
3" Min.
Sediment Trap
Gas
Regulator
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible Gas
Hose (if
allowed by
local codes)
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