York YCAL0056 User Manual

JOHNSON CONTROLS
192
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
SECTION 8 – UNIT OPERATION
PROGRAMMING - YCAL0019 – 0028
Condenser fan control type must be programmed un-
der both the OPTIONS and PROGRAM keys when a
VFD is installed on the chiller. Under the OPTIONS
key, FAN CONTROL must be programmed for DIS-
CHARGE PRESSURE CONTROL only. This will as-
sure condenser fan control of the chiller is solely by
discharge pressure, with no ambient control.
Under the PROGRAM key, the FAN
CONTROL ON PRESSURE should
be programmed for 385 PSIG and the
FAN DIFFERENTIAL OFF PRES-
SURE must be programmed for 125
PSIG.
Programming as suggested assures the chiller control
points for the second fan in the fan staging sequence
and the inverter control points are matched for opti-
mum control of the fans at reduced ambient tempera-
tures, assuring superheat and oil control is not compro-
mised. When the chiller and VFD fan control points
are programmed properly, the fans will operate as out-
lined in Table 24.
YCAL0033 Low Ambient Fan Control Option
General
The low ambient option consists of a VFD (Variable
FrequencyDrive)thatcontrolsthespeedoftherstfan
(Fan 1) in the fan staging sequence. The VFD is locat-
ed on the top of chiller above the compressor section.
Examples of the typical VFD location and enclosure
mountings are shown in Figures 49 and 50.
FIGURE 49 - TYPICAL VFD ENCLOSURE LOCATIONS
VFD Enclosure Location
LD12080
TABLE 24 - YCAL0019 – 0028 VFD LOW AMBIENT OPTION – CONDENSER FAN CONTROL OPERATION
FAN STAGE ON OFF
CONTACTOR MICROBOARD FAN #
SYS 1 SYS 1 SYS 1
1:
VFD CONTROL
(1 FAN
VARIABLE
SPEED)
FAN SPEED
IS A FUNCTION OF
LIQUID TEMPERATURE
FAN WILL TURN ON
WHEN LIQUID LINE
TEMPERATURE IS
ABOVE 65º F. SPEED
INCREASES WITH
TEMPERATURE,
FAN WILL TURN OFF
WHEN LIQUID
TEMPERATURE DROPS
BELOW 65 °F
7M TB7-3 1
2:
1 FAN VFD
CONTROL
2ND FAN
FULL SPEED
UNDER
CONTACTOR
CONTROL
385 PSIG,
BOTH FANS
WILL BE RUNNING
FULL SPEED
DISCHARGE
PRESSURE
< 260 PSIG (PRESSURE
IS
< FAN CONTROL ON
PRESSURE OF
385 PSIG MINUS FAN
DIFFERENTIAL
PRESSURE OF 125 PSIG
= 260 PSIG)
FAN 1 WILL STILL
BE RUNNING
7M & 8M
TB7- 3
&
TB7-10
1 & 3

York YCAL0056 Specifications

General

Brand	York
Model	YCAL0056
Category	Chiller
Language	English