W7220 Economizer Module Wiring; Time-Out And Screen Saver; Start-Up And Operation; Cooling, Unit With Economi$Er® X - Carrier CRECOMZR067A01 Installation Instructions Manual

W7220 Economizer Module Wiring

Use Tables 12 and 13 to locate the wiring terminals for the
economizer module.
Table 12 — Economizer Module - Left Hand
Terminal Blocks
LABEL TYPE
Top Left Terminal Block
MAT 20k NTC Mixed Air Temperature Sensor (Polarity
MAT and COM Insensitive Connection)
OAT 20k NTC Outdoor Air Temperature Sensor
OAT and COM (Polarity Insensitive Connection)
S-BUS S-BUS (Sylk Enthalpy Control Sensor
S-BUS Bus) (Polarity Insensitive Connection)
Bottom Left Terminal Block
Air Quality Sensor Input (e.g. CO
IAQ 2-10 2-10 vdc
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
Table 13 — Economizer Module - Right Hand
Terminal Blocks
LABEL TYPE
Top Right Terminal Blocks
The first terminal is not used.
na
Shut Down (SD) or HEAT (W)
Conventional only
AUX2 I 24 vac IN and
Heat Pump Changeover (O-B) in Heat
Pump mode.
OCC 24 vac IN Occupied/Unoccupied Input
E-GND E-GND Earth Ground - System Required
EXH1 24 vac OUT Exhaust Fan 1 Output
Programmable:
Exhaust fan 2 output
or
AUX1 O 24 vac OUT
ERV
or
System alarm output
Bottom Right Terminal Blocks
Y2 in - Cooling Stage 2 Input from
Y2-I 24 vac IN
space thermostat
Y2 out - Cooling Stage 2 Output to
Y2-O 24 vac OUT
stage 2 mechanical cooling
Y1 in - Cooling Stage 2 Input from
Y1-I 24 vac IN
space thermostat
Y1 out - Cooling Stage 2 Output to
Y1-O 24 vac OUT
stage 2 mechanical cooling
C COM 24 vac Common
R 24 vac 24 vac Power (hot)

Time-out and Screen Saver

When no buttons have been pressed for 10 minutes, the
LCD displays a screen saver, which cycles through the Status
items. Each status item displays in turn and cycles to the next
item after 5 seconds.
DESCRIPTION
2
DESCRIPTION

START-UP AND OPERATION

Cooling, Unit with EconoMi$er
For Occupied mode operation of EconoMi$er X system,
there must be a 24-v signal at terminals R and OCC (provided
through PL6-3 from the unit's IFC coil). Removing the signal
at OCC places the EconoMi$er X control in Unoccupied
mode. See Table 14 for Damper Position Control.
During Occupied mode operation, indoor fan operation
will be accompanied by economizer dampers moving to Min-
imum Position setpoint for ventilation. If indoor fan is off,
dampers will close. During Unoccupied mode operation,
dampers will remain closed unless a Cooling (by free cool-
ing) or DCV demand is received.
When free cooling using outside air is not available, the
unit cooling sequence will be controlled directly by the space
thermostat. Outside air damper position will be closed or
Minimum Position as determined by Occupancy mode and
fan signal.
When free cooling is available as determined by the appro-
priate changeover command (dry bulb, outdoor enthalpy, dif-
ferential dry bulb or differential enthalpy), a call for cooling
(Y1 closes at the thermostat) will cause the economizer con-
trol to modulate the dampers open and closed to maintain the
unit supply air temperature. Default mixed air temperature is
53°F, with a range of 38°F to 70°F. Compressor will not run.
Should 100% outside air not be capable of satisfying the
space temperature, space temperature will rise until Y2 is
closed. The economizer control will call for compressor oper-
ation. Dampers will modulate to maintain MAT at set point
concurrent with Compressor 1 operation. The "Low T Lock"
setting (default 32°F) will lock out compressor operation
when outside air temperature is below setpoint.
When space temperature demand is satisfied (thermostat
Y1 opens), the dampers will return to Minimum Damper po-
sition if indoor fan is running or fully closed if fan is off.
If accessory power exhaust is installed, the power exhaust
fan motors will be energized by the economizer control as the
dampers open above the EXH1 SET setpoint and will be de-
energized as the dampers close below the EXH1 SET set-
point. (For single speed unit.)
Damper movement from full closed to full open (or vice
versa) will take between 1
Heating with EconoMi$er
During Occupied mode operation, indoor fan operation will
be accompanied by economizer dampers moving to Minimum
Position setpoint for ventilation. If indoor fan is off, dampers
will close. During Unoccupied mode operation, dampers will
remain closed unless a DCV demand is received.
When the room temperature calls for heat (W1 closes), the
heating controls are energized.
22
X
®
1 / and 2 1 / minutes.
2 2
X
®