Desa VF-24N-MHD - Manual (Page 12)

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CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection
to the shutoff valve.
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
CAUTION: Never connect
propane/LP fireplace directly
to the propane/LP supply. This
heater requires an external regu-
lator (not supplied). Install the
external regulator between the
heater and propane/LP supply.
WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This gas
is commonly known as wellhead
gas.
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 flexible gas line with gas connector
(if allowed by local codes)
* 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 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.
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 1/2" diameter or
greater to allow proper gas volume
to heater. If pipe is too small, undue
loss of volume will occur.
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 flexible 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 fitting (not provided). Connect approved
flexible gas hose to inlet side of gas control (see
Figure 10). IMPORTANT: Hold gas fitting with
wrench when connecting flexible gas hose.
2. Position heater assembly in fireplace.
3. Connect to gas supply. See Connecting to
Gas Supply.