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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 —
Open
On
On
High
2SP
Delay
†
24 V/On
0 V/Off** Modulating: MIN POS H to
Full — Open
Modulating: Closed to Full —
Open
Summary of Contents for WeatherExpert 50LC14
Page 4: ...4 Fig 2 50LC Vertical Airflow Size 14...
Page 5: ...5 Fig 3 50LC Horizontal Airflow Size 14...
Page 6: ...6 Fig 4 50LC Back View and Condensate Drain Location Size 14...
Page 7: ...7 Fig 5 50LC Corner Weights and Clearances Size 14...
Page 8: ...8 Fig 6 50LC Bottom View Size 14...
Page 9: ...9 Fig 7 50LC Vertical Airflow Sizes 17 20...
Page 10: ...10 Fig 8 50LC Horizontal Airflow Sizes 17 20...
Page 11: ...11 Fig 9 50LC Back View and Condensate Drain Location Sizes 17 20...
Page 12: ...12 Fig 10 50LC Corner Weights and Clearances Sizes 17 20...
Page 13: ...13 Fig 11 50LC Bottom View Sizes 17 20...
Page 14: ...14 Fig 12 50LC Vertical Airflow Sizes 24 26...
Page 15: ...15 Fig 13 50LC Horizontal Airflow Sizes 24 26...
Page 16: ...16 Fig 14 50LC Back View and Condensate Drain Location Sizes 24 26...
Page 17: ...17 Fig 15 50LC Corner Weights and Clearances Sizes 24 26...
Page 18: ...18 Fig 16 50LC Bottom View Sizes 24 26...
Page 21: ...21 Fig 19 Roof Curb Details 14 Size Unit...
Page 22: ...22 Fig 20 Roof Curb Details 17 and 20 Size Units...
Page 23: ...23 Fig 21 Roof Curb Details 24 and 26 Size Units...
Page 30: ...30 Fig 42 50LC 14 26 Electro Mechanical Control Wiring Diagram...
Page 31: ...31 Fig 43 50LC 14 26 RTU Open Control Wiring Diagram...
Page 32: ...32 Fig 44 50LC 14 26 SystemVu Control Wiring Diagram...
Page 35: ...35 Fig 47 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 208 230V Shown...
Page 36: ...36 Fig 48 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 460V 575V Shown...
Page 80: ......
Page 81: ......