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7- If improper venting is observed during any of the
above tests, the common venting system must be
corrected. The common venting system should be
resized to approach the minimum size as determined
by using the appropriate Tables in Appendix G in the
current standards of the National Fuel Gas Code,
ANSI Z223-1 in the U.S.A. and the appropriate
Category I Natural Gas and Propane appliances
venting sizing Tables in the current standards of the
CAN/CGA-B149.1 and .2 in the Natural Gas and
Propane Installation Code in Canada.
NOTE - Local codes may supersede any of the above
provisions.
Electrical Connections
NOTE - The FSA(N,P) series unit heaters use a direct
spark ignition system. There is no pilot necessary as the
spark lights the main burner as the gas valve is turned on.
The direct spark ignition control board emits radio noise as
the sparking process is underway. The level of energy
may be sufficient to disturb a logic circuit in a
microprocessor controlled thermostat. It is recommended
that an isolation relay be used when connecting the unit
heaters to a microprocessor controlled thermostat. Install
the thermostat according to instructions provided. Select
circuit protection and wire size according to the unit rating
plate. Install a separate disconnect switch (protected by
either fuse or circuit breaker) near the unit so that power
can be turned off for servicing. Connect wiring through
knockout on the junction box located on the side of the
unit heater. Refer to heater wiring diagram for connection
information. Use 18 gauge wire or larger for thermostat
connections.
Electrically ground unit in accordance with local codes or,
in the absence of local codes, in accordance with the
current National Electrical Code (ANSI/NFPA No. 70) in
the U.S.A., and in Canada with the current Canadian
Electrical Code, Part 1 (CSA C22.1).
NOTE - Uninsulated ground wires must be wrapped in
electrical tape to avoid damage to the electrical system.
Make line voltage connections as shown in Figure 7.
Connect field wiring as shown on wiring diagram on unit.
Also refer to typical diagram in this manual. An additional
thermostat wire must be run to terminal “G" on heater
when continuous blower is desired.
FIGURE 7
LINE VOLTAGE FIELD WIRING
L1
WHITE
WHITE
BLACK WIRE WITH WHITE TAPE OR
WHITE WIRE WITHOUT TAPE
N
BLACK
UNIT
BLACK
