Desa VTN25R Safety Information And Installation Manual page 10

INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 3/8" 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.
WARNING: For natural gas,
never connect heater to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
IMPORTANT: For natural gas, check gas line
pressure before connecting heater to gas line. Gas
line pressure must be no greater than 10.5 inches
(2.6 kPa) of water. If gas line pressure is higher,
heater regulator damage could occur.
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.
For propane/LP gas, 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
(2.7 and 3.5 kPa) of water. If you do not reduce
incoming gas pressure, heater regulator damage
could occur. Install the external regulator with
the vent pointing down as shown in Figure 12.
Pointing the vent down protects it from freezing
rain or sleet.
10
Propane/LP
Supply Tank
Figure 12 - External Regulator With Vent
www.desatech.com
Pointing Down
External
Regulator
Vent
Pointing
Down
113261-01C