Equipment Control Module Wiring; Outdoor Temperature Sensor (Included); Optional Wireless Outdoor Temperature Sensor - Aprilaire Home Comfort Control 8910W Safety & Installation Instructions

InsTallaTIon

eQuIpMenT ConTRol MoDule WIRInG

Wire specifications:
18-24 gauge thermostat wire
Installation notes:
• E nsure power at the HVAC equipment is off.
• L oosen screw terminals, insert stripped wire
and re-tighten .
• U se zip tie to route wiring through the wiring
channels .
1 – Connection to terminal 1 at thermostat
2 – Connection to terminal 2 at thermostat
3 – Connection to terminal 3 at thermostat
RaT – Return air temperature sensor (optional)
laT – Leaving air temperature sensor (optional)
oDT – Outdoor temperature sensor (optional)
4
C – 24VAC common
R – 24VAC
RC – 24VAC cooling
RH – 24VAC heating
W – First stage heat (conventional)/auxiliary (heat pump)
W2 – Second stage heat (conventional)/ auxiliary (heat
pump)
W3/b – Third stage heat (conventional)/reversing valve
(heat pump)
y – First stage cooling (conventional)/first stage compressor
(heat pump)
y2 – Second stage cooling (conventional)/second stage
compressor (heat pump) .
y3/0 – Third stage cooling (conventional)/reversing valve
(heat pump)
G – Fan
l – System fault indicator (heat pump only) (optional)
C – 24VAC common from heat pump for system fault
eQ
indicator (optional)
HuM – Humidifier
DHno & DHcom – Normally open dehumidifier control
DHnc & DHcom – Normally closed dehumidifier control
VenT – Ventilation
eaC – Electronic Air Cleaner
InsTallaTIon

ouTDooR TeMpeRaTuRe sensoR (InCluDeD)

Outdoor temperature can be measured by installing an 8052 sensor to the ODT terminals and enabling the outdoor
sensor in the installer set-up menu. When an outdoor sensor is installed, the features below will be enabled.
In heat pump mode the outdoor temperature sensor can be used to efficiently utilize an air source heat pump:
• W hen the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only
auxiliary heating will be used to provide heating.
• W hen the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be locked out and
only the heat pump will be used to provide heating .
Indoor air Quality functions can use the outdoor temperature sensor to:
• C ontrol humidification setpoint based on outdoor temperature to prevent condensation
• L ock out humidification for temperatures over 60°F or below -30°F.
• L ock out ventilation based on high and/or low outdoor temperatures.
• D isplay outdoor temperature on thermostat.
outdoor temperature sensor should
be mounted:
• O n side of building out of direct sunlight
(north side recommended) .
• A bove snow line.
• A t least 3' away from exhaust vents and
condensing lines .
• U sing less than 300' of wire.
• D o not route wires along 120 VAC lines.

opTIonal WIReless ouTDooR TeMpeRaTuRe sensoR

For installations where it is difficult to wire the included 8052 outdoor temperature sensor, a Model 8056 wireless
outdoor temperature module can be used. The Model 8056 module has two radio units, one that is placed on the
equipment control module as shown below, and a second radio that is placed outside. See the Model 8056 Installation
Instructions for detailed directions regarding installation .
outdoor sensor
5