189
JOHNSON CONTROLS
SECTION 8 – UNIT OPERATION
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
8
STANDARD CONDENSER FAN CONTROL – YCAL0043 – YCAL0066
TABLE 22 - YCAL0043 – YCAL0066 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE
FAN
STAGE
ON* OFF*
CONTACTOR
MICRO BOARD
OUTPUT
FAN #
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
DP> FAN CRTL ON
PRESS
DP < FAN CTRL ON
PRESS – DIFF.PRESS 7M 10M TB7-9
TB10-9
1 2
2
DP > FAN CTRL
ON PRESS AND
FAN STAGE 1 IS
ENERGIZED
DP < FAN CTRL ON
PRESS –
DIFF. PRESS
7M
&
8M
10M
&
11M
TB7-9
&
TB7-10
TB10-9
&
TB10-10
1
&
3
2
&
4
TABLE 23 - YCAL0043 – YCAL0066 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
FAN
STAGE
ON OFF
CONTACTOR
MICRO BOARD
OUTPUT
FAN #
SYS 1 SYS 2 SYS 1 SYS 2 SYS 1 SYS 2
1
DP > FAN CTRL
ON PRESS
DP < FAN CTRL ON
PRESS – DIFF. PRESS.
7M 10M TB7-9
TB10-9
1 2
2
DP > FAN CTRL
ON PRESS AND
FAN STAGE 1 IS
ENERGIZED
DP < FAN CTRL ON
PRESS – DIFF. PRESS.
7M
&
8M
10M
&
11M
TB7-9
&
TB7-10
TB10-9
&
TB10-10
1
&
3
2
&
4
* 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.
FIGURE 44 - YCAL0043 – YCAL0066 FAN LOCATION (TYPICAL)
LD11419
FAN #1
FAN #2
FAN #3
FAN #4
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