40
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 dif
-
ferential 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 (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 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 41 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 (–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. 68 and Tables 13 and 14 to locate the wiring terminals
for the Economizer module.
NOTE: The four terminal blocks are removable. Slide out each
terminal block, wire it, and then slide it back into place.
Fig. 68 — W7220 Wiring Terminals
Table 13 — Economizer Module - Left Hand Terminal
Blocks
LABEL
TYPE
DESCRIPTION
Top Left Terminal Block
MAT
MAT
20k NTC
and COM
Mixed Air Temperature Sensor
(Polarity Insensitive Connection)
OAT
OAT
20k NTC
and COM
Outdoor Air Temperature Sensor
(Polarity Insensitive Connection)
S-BUS
S-BUS
S-BUS
(Sylk
*
Bus)
*Sylk is a trademark of Honeywell International Inc.
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Bottom Left Terminal Block
IAQ 2-10
2-10 vdc
Air Quality Sensor Input (e.g. CO
2
sensor)
IAQ COM
COM
Air Quality Sensor Common
IAQ 24V
24 vac
Air Quality Sensor 24 vac Source
ACT 2-10
2-10 vdc
Damper Actuator Output (2-10 vdc)
ACT COM
COM
Damper Actuator Output Common
ACT 24v
24 vac
Damper Actuator 24 vac Source
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y1-
Y2-O
Y1-O
C
R
50048848-002
Rev. A
NA
A2
OCC
EX
A1
Y2I
Y2O
Y1I
Y1O
C
R
MAT
MAT
OAT
OAT
S
-BU
S
S
-BU
S
IAQ 2-10
IAQCOM
IAQ 24V
ACT 2-10
ACT COM
ACT 24V
MA
MA
OA
OA
S
B
S
B
S
B
S
B
S
B
S
B
V
C
R
V
C
R
NA
50040839-001
Rev. G
HJW10
www.energy.ca.gov
Certified FDD Product
California Title 24, Part 6
