Support Module Wiring (Optional); Equipment Control Module Wiring - Aprilaire 8840 Safety & Installation Instructions

REMOTE TEMPERATURE SENSOR
(OPTIONAL)
A remote temperature sensor can be
used for control if the thermostat is to
be mounted in a concealed location or
a remote sensor can be averaged with
the thermostat sensor to control a large
space. An 8051 flush mount or 8053 surface
mount remote temperature sensor can
be attached to the T1 and T2 terminals
and mounted in a recommended area
The remote sensor must be enabled in the
installer setup menu, and once enabled
will override or be averaged with the
thermostat's internal temperature sensor,
based on the setting
Remote temperature sensor should
be mounted:
• On an interior wall, in a frequently
occupied space
• Approximately 5 feet above floor.
• At least 18" from outside wall
• Using less than 300 feet of wire
Do not mount remote sensor:
• Behind doors, in corners or other dead air
spaces
• In direct sunlight, near lighting fixtures, or
other appliances that give off heat
• On an outside or unconditioned area wall
• In the flow of a supply register, in
stairwells, or near outside doors
• On a wall with concealed pipes or
ductwork
• Near 120 VAC lines

SUPPORT MODULE WIRING (OPTIONAL)

Up to 4 support modules can be wired for
remote sensing of temperature and/or
humidity. Each sensor can be configured for
control or monitoring
NOTE: Support modules should be wired
with CAT-5 wire The total length of wire for
all support modules should not exceed
1000 feet
4
FIGURE 5 – REMOTE
TEMPERATURE SENSOR
90-2124
FIGURE 6 – MODEL 8081 OR 8082
SUPPORT MODULE
RC C RSB RSA T1 T2 T3 T4
A
B 3
T2 2
T1 1
90-2169
FIGURE 7 – MODEL 8083
SUPPORT MODULE
90-2282
8083
Module Red Black Yellow Green
8840
1 2 A B
Thermostat

EQUIPMENT CONTROL MODULE WIRING

Wire specifications:
• 18-24 gauge thermostat wire
Installation notes:
• Ensure power at the HVAC equipment is off
• Loosen screw terminals, insert stripped wire
and re-tighten
• Use 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 (included)
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 indicator (optional)
EQ
HUM
Humidifier
DHnc & DHcom
Normally closed dehumidifier control
DHno & DHcom Normally open dehumidifier control
VENT Ventilation
EAC Electronic Air Cleaner
90-1713
5