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SECTION 36 - SOFTWARE ENHANCEMENTS
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
36
SI0034 - SOFTWARE ENHANCEMENTS EFFECTIVE AUGUST 2002 (CONT'D)
Microboard Program Jumpers JP21 and JP22 must be
placed in the positions 2 and 3.
Proximity probe/LIMIT SWITCH
Previously, YK chillers equipped with
P
compressors
used the high speed thrust bearing limit switch and
all other compressors used the proximity probe. With
Style F chillers, only the
J
compressor will use the
proximity probe. compressors G, H and P will use the
limit switch.
In previous flash memory card versions, the Thrust
Bearing Limit Switch indication shows a lit LED for
a normal condition and unlit for a faulted condition. In
this version, an unlit LED indicates a normal condition
and a lit LED indicates a faulted condition.
REFRIGERANT LEVEL CONTROL
In previous flash memory card versions, this control
operates as follows:
When the chiller enters system run, if the refrigerant
level position is less than the control
setpoint, a lin-
early increasing ramp limit, called the refrigerant level
target, is applied to the control
setpoint. This ramp lim-
it allows the level to go from the present programmed
level to the programmedcontrol
setpoint
over a period
of 15 minutes. During these 15 minutes, the
refrigerant
level target is used to control the condenser refrigerant
level. The control setpoint is used to control the refrig-
erant level for the remainder of chiller run.
In this version, the control will operate as follows:
• While the chiller is stopped, or if the level control
is disabled, the refrigerant level lower output is
energized.
• Upon entering chiller pre-lube, the refrigerant
level raise
output is energized for the length of the
programmable valve preset time setpoint (0 to 100
seconds; default 50; SERVICE access level). Af-
ter pre-positioning, the valve is held in this posi-
tion until the first three minutes of chiller run time
have elapsed. Setting the valve preset time to 0
seconds disables this pre-positioning feature. Set-
ting the valve preset time to a value greater than
50 seconds has no effect on the pre-lube time.
• After three minutes of run time, if the refriger-
ant level is less than the control setpoint, a lin-
early increasing ramp limit, called the refrigerant
level target, is applied to the programmed control
setpoint. This ramp limit allows the level to go
from the present level to the control
setpoint over
a period of time programmed as the ramp-up time
setpoint (3 to 15 minutes; default 8; SERVICE ac-
cess level). During this ramp-up period, the refrig-
erant level target is used to control the refrigerant
level in the condenser. The control
setpoint is used
to control the level during the remainder of chiller
run.
• If the valve preset time
setpoint is set to 0 seconds
and the ramp-up time setpoint is set to 15 minutes,
Refrigerant level control will operate exactly the
same as previous flash memory card versions.
Microboards
Since the new version flash memory card (as de-
scribed above) is applicable to all YK chillers with
any compressor, the microboard replacement kit (P/N
331-01730-604) previously supplied for YK chillers
equipped with
P
compressors is no longer required.
The standard microboard replacement kit (P/N 331-
01730-601) will be supplied when part number 331-
01730-604 is ordered.
