33
STANDARD OR SINGLE SPEED FAN OPERATION
FAN TYPE = 1 SPEED is not used on 547K*14 units.
2 SPEED FAN OPERATION
The W7220 controller has the capability to work with a system
using a 2-speed supply fan. The W7220 does not control the
supply directly but uses the following input status to determine
the speed of the supply fan and controls the OA damper to the
required position, see Table 10.
The W (heating mode) is not controlled by the W7220 but it re
-
quires the status to know where to position the OA damper for
minimum position for the fan speed.
The 2 speed fan delay is available when the system is pro
-
grammed for 2 speed fan (in the System Setup menu item). The
2 speed fan delay is defaulted to 5 minutes and can be changed
in the Advanced Setup menu item. When the unit has a call for
Y1 In and in the free cooling mode and there is a call for Y2 In,
the 2-speed fan delay starts and the OA damper will modulate
100% open, the supply fan should be set to high speed by the
unit controller.
After the delay, one of 2 actions will happen:
• The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will turn off
OR
• If the call for additional cooling in the space has not been
satisfied then the first stage of mechanical cooling will be
enabled through Y1 Out or Y2 Out.
Refer to Table 11 for economizer operation.
LEGEND
Table 10 — Fan Speed
STATE
FAN SPEED
OCC
Low
Y1
Low
Y2
High
W
High
Table 11 — Economizer Operation — FAN TYPE = 2SPEED
INPUTS
OUTPUTS
DEMAND
CONTROLLED
VENTILATION
(DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
W
(HEAT ON)
COOL
Y1-IN
COOL
Y2-IN
COOL
Y1-OUT
COOL
Y2-OUT
FAN SPEED
(reference
only)
DAMPER POSITION
OCCUPIED
UNOCCUPIED
NONE
NO
ON
N/A
N/A
OFF
OFF
HIGH
MIN POS H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
MIN POS L
Closed
OFF
ON
OFF
ON
OFF
LOW
MIN POS L
Closed
OFF
ON
ON
ON
ON
HIGH
MIN POS H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
MIN POS H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
MIN POS L
Closed
OFF
ON
OFF
OFF
OFF
LOW
MIN POS L to
Full Open
Closed to
Full Open
OFF
ON
ON
ON
OFF
a
HIGH
MIN POS H to
Full Open
Closed to
Full Open
Below CO
2
Set
NO
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
VENTMIN L
Closed
OFF
ON
OFF
ON
OFF
LOW
VENTMIN L
Closed
OFF
ON
ON
ON
ON
HIGH
VENTMIN H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
VENTMIN L
Closed
OFF
ON
OFF
OFF
OFF
LOW
VENTMIN L to
Full Open
Closed to
Full Open
OFF
ON
ON
ON
OFF
HIGH
VENTMIN H to
Full Open
Closed to
Full Open
Above CO
2
Set
NO
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H to
VENTMAX H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
VENTMIN L to
VENTMAX L
Closed
OFF
ON
OFF
ON
OFF
LOW
VENTMIN L to
VENTMAX L
Closed
OFF
ON
ON
ON
ON
HIGH
VENTMAX H to
VENTMAX H
Closed
YES
ON
N/A
N/A
OFF
OFF
HIGH
VENTMIN H to
VENTMAX H
Closed
OFF
OFF
OFF
OFF
OFF
LOW
VENTMIN L to
VENTMAX L
Closed
OFF
ON
OFF
OFF
OFF
LOW
VENTMIN L to
Full Open
Closed to
Full Open
OFF
ON
ON
ON
OFF
HIGH
VENTMIN H to
Full Open
Closed to
Full Open
NOTE(S):
a. With stage 3 delay (STG3 DLY) in Advanced setup, COOL Y2-OUT will be turned ON after the delay time specified.
N/A
—
Not Applicable
Summary of Contents for Legacy 547K 14
Page 4: ...4 Fig 2 547K 14 Unit Dimensional Drawing...
Page 5: ...5 Fig 2 547K 14 Unit Dimensional Drawing cont...
Page 8: ...8 Fig 5 547K 14 Roof Curb Details...
Page 21: ...21 Fig 41 Typical Control Wiring Diagram Electromechanical with W7220 Controller...
Page 22: ...22 Fig 42 Typical Power Wiring Diagram 208 230 460 3 60 Unit Shown...
Page 23: ...23 Fig 43 Typical Power Wiring Diagram 575 3 60 Unit Shown...
Page 41: ......
