Desa CDR3924NT Owner's Operation And Installation Manual page 12

8. Remove heater base from fireplace. If
installing optional control accessories,
do so at this time. Follow all directions
provided with accessory.
9. Drill holes at marked locations using 3/16"
drill bit.
10. Attach base assembly to fireplace floor
using two masonry screws (in hardware
package).
Mounting
Flange
Masonry
Screw
Figure 11 - Attaching Base Assembly to
Fireplace Floor
CONNECTING TO GAS SUppLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
CAUTION: For propane/LP
gas, never connect heater di-
rectly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between the
heater and propane/LP supply.
Installation Items Needed
Before installing heater, make sure you have
the items listed below.
• external regulator for propane/LP only (sup-
plied by installer)
12
INSTALLATION
Continued
• 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 al-
ternative to test gauge connection. Purchase
the optional CSA design-certified equipment
shutoff valve from your dealer.
For propane/LP only, 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
pressure, heater regulator damage could occur.
Install external regulator with the vent pointing
down as shown in Figure 12. Pointing the vent
down protects it from freezing rain or sleet.
gas, never connect heater to
private (non-utility) gas wells.
This gas is commonly known
as wellhead gas.
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" inside diameter or greater
to allow proper gas volume to
heater. If pipe is too small, undue
loss of volume will occur.
Propane/LP
Supply Tank
Figure 12 - External Regulator With Vent
www.desatech.com
WARNING: For natural
CAUTION: Use only new,
Pointing Down
External
Regulator
with Vent
Pointing
Down
122270-01D