York YCAL0019 - TABLE 21 - YCAL0019 - YCAL0033 Condenser Fan Control Using Discharge Pressure Only; FIGURE 43 - YCAL0019 - YCAL0033 Fan Location (Typical); TABLE 20 - YCAL0019 - YCAL0033 Condenser Fan Control Using Discharge Pressure

JOHNSON CONTROLS
188
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
SECTION 8 – UNIT OPERATION
LD12211
STANDARD CONDENSER FAN CONTROL – YCAL0019 – YCAL0033
TABLE 20 - YCAL0019 – YCAL0033 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE
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
TABLE 21 - YCAL0019 – YCAL0033 CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
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
* 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.
FAN #1
FAN #2
FIGURE 43 - YCAL0019 – YCAL0033 FAN LOCATION (TYPICAL)