C. If unit is equipped with Motorized Fresh Air
Damper, and is activated with Fresh Air Switch
[FAS], damper opens with call for indoor fan.
D. If room temperature is
above
thermostat
setting fan operation continues as noted
above.
E. If room temperature is
below
thermostat
setting, electric heater is energized until room
temperature satisfies thermostat.
F. Once room temperature increases above set
point by 3º F (2º C), electric heaters are de-
energize.
B.2 “Hydronic Heat”
A. If FCS is set to “On” (Continuous Fan
Operation) and unit has Aquastat, the indoor
fan and fresh air motorized damper operation
are controlled by the Aquastat.
B. If the Aquastat senses temperature of 80 ± 5º
F (26 ± 3º C) or below, the indoor fan shuts
down and the motorized damper closes fresh
air door.
C. With call for heat, signal from processor board
activates water or steam valve.
D.
If unit is equipped with a field installed
Aquastat [AS], the indoor fan start will be
delayed until the hydronic coil reaches 100
± 5 ºF (38 ± 3 ºC). The signal to the water
or steam valve will continue until the room
temperature rises above the set point by 3 ºF
(2 ºC). If the FCS is set to “Off”, the indoor
fan will continue to operate for 60 seconds or
until the hydronic coil temperature as sensed
by the Aquastat reaches 80 ± 5 ºF (26 ± 3
ºC), whichever occurs first. If the FCS is set
to “On”, the indoor fan will de-energize if the
Aquastat senses a temperature of 80 ± 5 ºF
(26 ± 3 ºC) or below.
SEQUENCE OF OPERATION
B.3 “Remote Wall Thermostat Controls”
Cooling and Heating operates identical to unit
mount controls.
See remote controls manual for control details.
Remote units do not use a system switch, or FCS.
The Right Fit for Comfort
16
P/N 240010639, Rev. A [06/15/2014
]
