ECR RetroAire R90C Installation, operation & maintenance manual - page 15
• R_ _H; Auxiliary Heating “Electric” or “Hydronic”
1.
Outdoor coil temperature falls to 25ºF (-4ºC) or
below for 180 seconds at anytime during heating call,
compressor and outdoor fan motor are de-energized
and auxiliary heat is energized.
2.
Anti-Short Cycle Timer is initiated, prohibiting
compressor operation for 180 seconds.
3.
Processor Board Trouble Code LED flashes 3 blink
Trouble Code, indicating auxiliary heat operation.
Heating operation with auxiliary heat continues until
outdoor coil sensor reaches 50ºF (10ºC).
• “Electric Heat”
1.
System Switch [SS] set to “Heat”, and Fan Cycle
Switch [FCS] set to “On” (Continuous Fan Operation),
indoor fan motor will start.
2.
Fan Cycle Switch [FCS] set to “Off” (Cycling Fan
Operation), indoor fan motor starts with call for
heating from internal thermostat [T’stat].
3.
Unit equipped with optional Motorized Fresh Air
Damper, and activated with Fresh Air Switch [FAS],
damper opens with call for indoor fan.
4.
Room temperature above thermostat setting fan
operation continues as noted above.
5.
Room temperature below thermostat setting, electric
heater is energized until room temperature satisfies
thermostat.
6.
Once room temperature increases above set point by
3ºF (2ºC), electric heaters de-energize.
• “Hydronic Heat”
1.
FCS set to “On” (Continuous Fan Operation) and
unit has Control, indoor fan and fresh air motorized
damper operation are controlled by Control.
2.
Control senses temperature of 80 ± 5ºF (26 ± 3ºC)
or below, indoor fan will shut down and motorized
damper closes fresh air door.
3.
With call for heat, signal from processor board
activates water or steam valve.
4.
Unit equipped with field installed Control [AS], indoor
fan start is delayed until hydronic coil reaches 100 ±
5ºF (38 ± 3ºC).
5.
Signal to water or steam valve continues until room
temperature rises above set point by 3ºF (2ºC).
6.
FCS set to “Off”, indoor fan continues to operate for
60 seconds or until hydronic coil temperature sensed
by Control reaches 80 ± 5ºF (26 ± 3ºC), whichever
occurs first.
7.
FCS set to “On”, indoor fan de-energizes if Control
senses temperature of 80 ± 5ºF (26 ± 3ºC) or below.
SEQUENCE OF OPERATION
• “Remote Wall Thermostat Controls”
A. Cooling and Heating operate identical to unit
mount controls.
B. See remote control manuals for control details.
C. Remote units do not use system switch, or FCS.
P/N 240010330, Rev. A [10/15/2013]
15
Made in USA