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Gas Heater (Electronic Ignition)
Make certain that the voltage of the heater employed is 240V to
match that of the equipment system and that current supplied to
the equipment system is sufficient to also satisfy the power
requirements for both the heater and the equipment system.
Ill. 4
Connecting Gas Heater with Electronic Ignition to Sentry
Controls
Connect wires (min. #16 AWG) from the heater 4-position
terminal block on the Sentry circuit board (Ill. 4) to the
appropriate power terminals in the gas heater. Consult your
heater owner's manual.
Gas Heater (Pilot Type)
Completely remove the red and black wires that connect 4-
position terminal block (Ill. 1, item 11) to the main terminal (Ill.
1, item 13). Connect wires (min. #16 AWG) from the heater 4-
position terminal block on the Sentry circuit board (Ill. 5). Cut
into the heater's control wiring harness and connect these wires
in series with the heater's controls.
9
Ill. 5
Connecting Gas Heater with Pilot to Sentry Controls
Use of External Heater's Controls
The control systems in the external heater should not be
disconnected. Instead, set the external heater's thermostat at
maximum. Failure to do this may result in the heater turning off
before the temperature set at the Sentry control panel is
reached.
Piping Through External Heater
The water flow capacity of any external heater used must be at
least 120 gpm. If the heater's flow capacity is not adequate, a
bypass system must be installed to prevent damage to the
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