58
Table 14 — Enthalpy Control Sensor DIP Switch
Settings
LEGEND
When an S-bus sensor is connected to an existing network, it will
take 60 minutes for the network to recognize and auto-configure
itself to use the new sensor. During the 60 minute setup period, no
alarms for sensor failures (except SAT) will be issued and no
economizing function will be available.
OPERATING SEQUENCES
Staged Air Volume (3-Speed) Fan Motor
The Integrated Staging Control (ISC) Board in the main unit deter-
mines the operating speed (LOW/MED/HIGH) of the indoor fan
based on space thermostat demand conditions. See Table 15 for
this logic.
Table 15 — Supply Fan Speed Logic Without
Economizer
W7220 Economizer Control
Tables 16 and 17 provide the W7220 Input/Output Logic.
Table 16 describes economizer functions for a unit without a CO
2
sensor. Table 17 describes economizer functions for a unit with
Demand Controlled Ventilation (CO
2
sensor connected). The sup-
ply fan speed is included in these tables for reference; this is nei-
ther an input or output of the W7220 controller.
Base Unit Controls
Base unit includes standard electromechanical controls, Staged
Air Volume (3-speed supply fan motor with VFD), EconoMi$er
®
X (with W7220 controller) and thermostat or unitary controller
that energizes the G terminal in cooling and heating to control the
supply fan operation.
Table 16 — W7220 Input/Output without CO
2
Sensor
* Fan Speed for reference only; not an input or output function of the W7220.
†
See Menu ADV SETUP —> 2SP FAN DELAY for details.
** See Menu ADV SETUP —> STG# DLY. With Stage 3 enabled, control can turn on second stage cooling Y2-O after delay if the call for Y2-I has not
been satisfied.
USE
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
1 2 3
DA OFF ON OFF
RA ON OFF OFF
OA OFF OFF OFF
DA = Discharge Air
RA = Return Air
OA = Outside Air
TSTAT
OUTPUT
SUPPLY FAN MOTOR SPEED
OFF LOW MED HIGH
G/OCC 0 V 24 V 0 V 0 V
Y1 0 V 24 V 0 V 0 V
Y2 0 V 0 V 24 V 0 V
Y3 0 V 0 V 0 V 24 V
W1 0 V 0 V 0 V 24 V
W2 0 V 0 V 0 V 24 V
INPUTS
FAN
SPED
(REF)*
OUTPUTS
DEMAND
CONTROLLED
VENTILATION
OUTSIDE AIR
GOOD TO
ECONOMIZE
Y1-I Y2-I
MECHANICAL
COOLING STAGE
OCCUPANCY
OUTSIDE AIR DAMPER POSITION
Y1-O/1ST Y2-O/2ND OCC YES OCC NO
NO CO
2
SENSOR
No
Off Off Low 0 V/Off 0 V/Off MIN POS L Closed
On Off Low 24 V/On 0 V/Off MIN POS L Closed
On On High 24 V/On 24 V/On MIN POS H Closed
Yes
Off Off Low 0 V/Off 0 V/Off MIN POS L Closed
On Off Low 0 V/Off 0 V/Off
Modulating: MIN POS L to
Full — Open
Modulating: Closed to Full —
O
pen
On On High
2SP
Delay
†
24 V/On
0 V/Off**
Modulating: MIN POS H to
Full — Open
Modulating: Closed to Full —
Open
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