9
SPECIFICATIONS
W7220 Economizer Module
The module is designed for use with 2 to 10Vdc or bus
communicating actuator. The module includes terminals
for CO
2
sensor, 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 without sensors or actuators
Relay Digital Output Rating at 30 Vac (maximum
power from Class 2 input only): 1.5A run:
3.5A inrush @ 0.45PF (200,000 cycles) or
7.5A inrush @ 0.45PF (100,000 cycles)
External Sensors Power Output: 21 Vdc 5% @ 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 Return Air (RA) bus sensor can be
added to the system for differential enthalpy or dry bulb
changeover. For differential dry bulb changeover a 20k
ohm sensor is required in the OA and a bus sensor 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(18to22AWG)
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 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 11 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 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 with full
recovery at --4_F from exposure to --40_F
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
Dimensions (see Fig. 5, below):
Height: 4.98 inches (126.4 mm)
Width: 6.3 inches (160 mm)
Depth: 1.34 inches (34 mm)
Weight: 0.58 lb. (0.265 kg)
6-19/64 (160)
4-63/64
(126)
3-5/32 (80)
MOUNTING HOLE (X2)
C14155
Fig. 5 -- Dimensions for Mounting Holes in Inches (mm)
BEFORE INSTALLATION
Review the “SPECIFICATIONS’ (above) before installing
the W7220A economizer module.
When Installing This Product
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check ratings given in instructions and on the product
to ensure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
SUP--TI24--02SI
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