34
STANDARD OR SINGLE SPEED FAN OPERATION
FAN TYPE = 1SPEED is not used on 50GC units.
2 SPEED FAN OPERATION
The W7220 controller has the capability to work with a system us-
ing 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 posi-
tion, see Table 9.
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 programmed
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 Ad-
vanced 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. See
Table 10.
After the delay one of two 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.
*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
Table 9 — Fan Speed
STATE
FAN SPEED
OCC
Low
Y1
Low
Y2
High
W
High
Table 10 — 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*
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
Содержание WeatherMaster 50GC 04-06 Series
Страница 4: ...4 Fig 2 50GC 04 06 Unit Dimensional Drawing...
Страница 5: ...5 Fig 2 50GC 04 06 Unit Dimensional Drawing cont...
Страница 6: ...6 Fig 2 50GC 04 06 Unit Dimensional Drawing cont...
Страница 22: ...22 Fig 42 Typical 50GC 04 06 Control Wiring Diagram 208 230V W7220 Control Unit Shown...
Страница 23: ...23 Fig 43 Typical 50GC 04 06 Power Wiring Diagram 208 230V Unit Shown...
Страница 41: ......
