Table of Contents
Advertisement
Table 14 — Enthalpy Control Sensor DIP Switch
Settings
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
USE
1
DA
OFF
RA
ON
OA
OFF
LEGEND
DA
= Discharge Air
RA
= Return Air
OA
= Outside Air
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.
INPUTS
DEMAND
OUTSIDE AIR
CONTROLLED
GOOD TO
VENTILATION
ECONOMIZE
No
NO CO
2
SENSOR
Yes
* 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.
2
3
ON
OFF
OFF
OFF
OFF
OFF
Table 16 — W7220 Input/Output without CO
FAN
SPED
Y1-I
Y2-I
(REF)*
Y1-O/1ST Y2-O/2ND
Off
Off
Low
On
Off
Low
24 V/On
On
On
High
24 V/On
Off
Off
Low
On
Off
Low
On
On
High
24 V/On
Table 15 — Supply Fan Speed Logic Without
TSTAT
OUTPUT
G/OCC
Y1
Y2
Y3
W1
W2
W7220 Economizer Control
Tables 16 and 17 provide the W7220 Input/Output Logic.
Table 16 describes economizer functions for a unit without a CO
sensor. Table 17 describes economizer functions for a unit with
Demand Controlled Ventilation (CO
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.
MECHANICAL
COOLING STAGE
OCC YES
0 V/Off
0 V/Off
MIN POS L
0 V/Off
MIN POS L
24 V/On
MIN POS H
0 V/Off
0 V/Off
MIN POS L
Modulating: MIN POS L to
0 V/Off
0 V/Off
Full — Open
2SP
0 V/Off** Modulating: MIN POS H to
Delay
†
Full — Open
58
Economizer
SUPPLY FAN MOTOR SPEED
OFF
LOW
MED
0 V
24 V
0 V
0 V
24 V
0 V
0 V
0 V
24 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
sensor connected). The sup-
2
Sensor
2
OUTPUTS
OCCUPANCY
OUTSIDE AIR DAMPER POSITION
OCC NO
Modulating: Closed to Full —
Modulating: Closed to Full —
HIGH
0 V
0 V
0 V
24 V
24 V
24 V
2
®
Closed
Closed
Closed
Closed
Open
Open
Advertisement
Table of Contents
