Design Dynamics VTD-18N-PDG Gas Heater User Manual


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111826-02J8
CAUTION: Never connect
  

-
 


WARNING: Never connect

   
    

Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• external regulator (for propane/LP units only,
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
• approved exible gas line with gas connector
(if allowed by local codes) (provided)
* A CSA design-certied equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certied equipment shutoff valve from your
dealer. See Accessories, page 19.
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" 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 6. Pointing the vent down protects
it from freezing rain or sleet.
Figure 6 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
Vent
Pointing
Down
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 7).
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.
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 25.
** Minimum inlet pressure for purpose of input
adjustment.
Figure 7 - Gas Connection
3" Minimum
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible Gas
Hose (if allowed
by local codes)
Cap Pipe Tee
Nipple Joint
Sediment Trap
Natural Gas
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)

From External
Regulator
(11" W.C.** to
14" W.C.
Pressure)
To Gas
Control
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