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FORM 150.67-NM2 (209)
163
JOHNSON CONTROLS
8
TABLE 20 –
YCAL0019 – YCAL0033 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
TABLE 19 –
YCAL0019 – YCAL0033 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE
LD12211
STANDARD CONDENSER FAN CONTROL – YCAL0019 – YCAL0033
FAN
STAGE
ON*
OFF*
CONTACTOR
MICROBOARD
OUTPUT
FAN #
SYS 1
SYS 1
SYS 1
1
DP> Fan Crtl On
Press
DP < Fan Ctrl On
Press – Diff.Press
7M
TB7-9
1
2
*DP > Fan Ctrl On
Press and Fan Stage
1 is energized
**DP < Fan Ctrl On
Press –
Diff. Press
7M
&
8M
TB7-9
&
TB7-10
1
&
3
FAN
STAGE
ON
OFF
CONTACTOR
MICROBOARD
OUTPUT
FAN #
SYS 1
SYS 1
SYS 1
1
DP > Fan Ctrl
On Press
DP < Fan Ctrl On
Press – (Diff. Press.)
7M
TB7-9
1
2
DP > Fan Ctrl On
Press and Fan Stage
1 is energized
**DP < Fan Ctrl On
Press – Diff. Press.
7M
&
8M
TB7-9
&
TB7-10
1
&
3
FAN #1
FAN #2
FIG. 20 –
YCAL0019 – YCAL0033 FAN LOCATION (TYPICAL)
* When a fan stage is turned on, the on pressure for the next stage is increased
20 PSIG and ramped back to the programmed on pressure over the next 20
seconds.
** When a fan stage is turned off (programmed on pressure minus
differential), the off pressure for the next stage is decreased 20
PSIG and ramped back to the programmed off pressure minus the
differential.
Содержание YCAL0019
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