Carrier 50FCQ 04-07 Series Service And Maintenance Instructions page 45

INPUTS
Sensors
NOTE: A Mixed Air (MA) analog sensor is required on all
W7220 units; either an Outdoor Air (OA) sensor for dry bulb
change over or an OA bus sensor for outdoor enthalpy change
over is required in addition to the MA sensor. An additional Re-
turn Air (RA) bus sensor can be added to the system for differen-
tial enthalpy or dry bulb changeover. For differential dry bulb
changeover a 20k ohm sensor is required in the OA and a bus sen-
sor in the RA. DIP switch on RA bus sensor must be set in the
RA position.
Dry Bulb Temperature (optional) and Mixed Air (required),
20k NTC
2-wire (18 to 22 AWG);
Temperature range –40 to 150°F (–40 to 65°C)
Temperature accuracy –0°F/+2°F
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range –40 to 150°F (–40 to 65°C)
Temperature accuracy –0°F/+2°F
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to 3 S-Bus sensors may be connected to the W7220
economizer module. For outdoor air (OA), return air (RA) and
discharge (supply) air (DA).
4 Binary Inputs
1-wire 24 vac + common GND (see page 46 for wiring details).
24 vac power supply
20 to 30 vac 50/60 Hz; 100 VA Class 2 transformer.
OUTPUTS
Actuator Signal
2-10 vdc; minimum actuator impedance is 2k ohm; bus 2-wire
output for bus communicating actuators.
Exhaust fan, Y1, Y2 and AUX1 O
All Relay Outputs (at 30 vac):
Running: 1.5A maximum
Inrush: 7.5A maximum
ENVIRONMENTAL
Operating Temperature
–40 to 150°F (–40 to 65°C).
Exception of display operation down to –4°F (–20°C) with full
recovery at –4°F (–20°C) from exposure to –40°F (–40°C).
Storage Temperature
–40 to 150°F (–40 to 65°C)
Shipping Temperature
–40 to 150°F (–40 to 65°C)
Relative Humidity
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS
Use Fig. 71 and Tables 13 and 14 to locate the wiring terminals for
the Economizer module.
NOTE: The 4 terminal blocks are removable. Slide out each ter-
minal block, wire it, and then slide it back into place.
MAT
MAT
OAT
OAT
S-BUS
S-BUS
IAQ 2-10
IAQCOM
IAQ 24V
ACT 2-10
ACT COM
ACT 24V
50040839-001
Rev. G
Fig. 71 — W7220 Wiring Terminals
Table 13 — Economizer Module —
Left Hand Terminal Blocks
LABEL TYPE
Top Left Terminal Block
MAT 20k NTC
MAT and COM
OAT 20k NTC
OAT and COM
S-BUS
S-BUS
(Sylk™ a
S-BUS
Bus)
Bottom Left Terminal Block
IAQ 2-10 2-10 vdc
IAQ COM COM
IAQ 24V 24 vac
ACT 2-10 2-10 vdc
ACT COM COM
ACT 24v 24 vac
NOTE(S):
a. Third-party trademarks and logos are the property of their respective owners.
45
MA
NA
MA
A2
OA
OCC
OA
EX
SB
SB
A1
SB
SB
Certified FDD Product
California Title 24, Part 6
HJW10
SB
SB www.energy.ca.gov
V
Y2I
C
R
Y2O
Y1I
V
Y1O
C
R
C
NA
R
50048848-002
DESCRIPTION
Mixed Air Temperature Sensor 
(Polarity Insensitive Connection)
Outdoor Air Temperature Sensor (Polarity
Insensitive Connection)
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Air Quality Sensor Input (e.g. CO
sensor)
Air Quality Sensor Common
Air Quality Sensor 24 vac Source
Damper Actuator Output (2-10 vdc)
Damper Actuator Output Common
Damper Actuator 24 vac Source
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y2-O
Y1-
Y1-O
C
R
Rev. A
2