Desa SBJ18VNA User Manual
www.desatech.com
114744-01B
14
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain 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 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 14).
IMPORTANT:
IMPORTANT:
Install equipment shutoff valve in
an accessible location within 6 feet of the appli-
ance. The equipment shutoff valve is for turning
on or shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male NPT
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 Acces-
sories, page 27.
**Minimum inlet pressure for purpose of input adjustment.
**Minimum inlet pressure for purpose of input adjustment.
Figure 14 - Gas Connection (Remote-Ready Models Only)
To Gas
Control
Valve
Control
Valve
3" Minimum
Sediment Trap
Propane/LP - From
External Regulator
(11" W.C.** To 14"
W.C. Pressure)
External Regulator
(11" W.C.** To 14"
W.C. Pressure)
Natural - From Gas
Meter (5" W.C.**
To 10.5" W.C.
Pressure)
Meter (5" W.C.**
To 10.5" W.C.
Pressure)
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible Gas Hose
(if allowed by local codes)
(if allowed by local codes)
Tee
Pipe
Cap
Joint
Nipple
For propane/LP units, 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 pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 13. Pointing the vent down
protects it from freezing rain or sleet.
Propane/LP
Supply Tank
Supply Tank
External
Regulator
Regulator
Figure 13 - External Regulator With Vent
Pointing Down
Vent
Pointing
Down
Pointing
Down