Desa VF-18P-MHd Water Heater User Manual


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116986-01B12

   
    
   




CAUTION: Never connect
  

-



WARNING: Never connect




INSTALLATION
Continued
Fitting
Flexible Gas Hose
(if allowed by local codes)
Figure 10 - Attaching Flexible Gas Hose
to Regulator
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)
* 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 25.
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 11. Pointing the vent down
protects it from freezing rain or sleet.


     
    




Figure 11 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
Vent
Pointing
Down
Installation Items Needed
• control cover kit (provided with heater)
• approved exible gas hose (if allowed by local
codes)
• sealant (resistant to propane/LP gas, not
provided)
1. Apply pipe joint sealant lightly to male threads
of gas tting (not provided). Connect approved
exible gas hose to inlet side of gas control (see
Figure 10). IMPORTANT: Hold gas tting with
wrench when connecting exible gas hose.
2.
Position heater assembly in replace.
3. Connect to gas supply. See Connecting to
Gas Supply.
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