Carrier 48FC M20 Series Service And Maintenance Instructions page 56

SPECIFICATIONS
W7220 Economizer Module
The module is designed for use with 2 to 10 vdc or bus communi-
cating actuator. The module includes terminals for CO
Mixed Air sensor, and an Outdoor Dry Bulb sensor. Enthalpy and
other options are available with bus sensors.
User Interface
Provides status for normal operation, setup parameters, checkout
tests, and alarm and error conditions with a 2-line 16 character
LCD display and four button keypad.
Electrical
Rated Voltage — 20 to 30 vac RMS, 50/60 Hz
Transformer — 100 va maximum system input
Nominal Power Consumption (at 24 vac, 60 Hz) — 11.5 VA with-
out sensors or actuators
Relay Digital Output Rating at 30 vac (maximum power from
Class 2 input only) — 1.5A run:
- 3.5A inrush at 0.45PF (200,000 cycles) or
- 7.5A inrush at 0.45PF (100,000 cycles)
External Sensors Power Output — 21 vdc ± 5% at 48mA
IMPORTANT: All inputs and outputs must be Class 2 wiring.
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°F to 150°F (–40°C 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°F to 150°F (–40°C to 65°C)
Temperature accuracy –0°F/+2°F
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (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 58 for wiring details).
24 vac power supply
20 to 30 vac 50/60Hz; 100 VA Class 2 transformer.
OUTPUTS
Actuator Signal:
2-10 vdc; minimum actuator impedance is 2k ohm; bus two-wire
sensor, output for bus communicating actuators.
2
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°F to 150°F (–40°C 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°F to 150°F (–40°C to 65°C)
Shipping Temperature:
–40°F to 150°F (–40°C to 65°C)
Relative Humidity:
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS
Use Fig. 75 and Tables 14 and 15 to locate the wiring terminals for
the Economizer module.
NOTE: The four terminal blocks are removable. You can slide out
each terminal 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. 75 — W7220 Wiring Terminals
56
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
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y2-O
Y1-
Y1-O
C
R
50048848-002
Rev. A