100
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 6 - I/O BOARD
JCI COMPANY CONFIDENTIAL JOHNSON CONTROLS
K11 - Oil Pump Starter (TB 1-29/1) (Style "C"
and earlier chillers)
In automatic operation, contacts close 13 seconds after
System Pre-lube is initiated. Contacts open at completion
of System Coastdown. In manual Oil Pump operation,
the contacts close for the duration of manual pump op-
eration. Anytime the chiller is not in System run or Sys-
tem Coastdown and a motor current value of greater than
15% FLA is detected, the contacts close until motor cur-
rent is no longer detected, whereupon a complete System
Coastdown is performed. If Standby Lubrication is en-
abled, contacts close for 2 minutes every 24 hours since
the oil Pump was last automatically or manually run.
K12 - Oil Return Solenoid (all styles, fixed
or variable speed oil pump). Liquid Line
Solenoid (style D (and later) chillers - J
compressor only, variable speed oil pump)).
Vent line Solenoid (style "C" and earlier
chillers, fixed speed oil pump). (TB1-61)
Contacts close 1 minute after System run is initiated.
They open on chiller shutdown coincident with the be-
ginning of System Coastdown.
With software version C.OPT.01.21.307 (and later), to
avoid an OIL – LOW TEMPERATURE DIFFEREN-
TIAL condition from preventing a chiller start after
running at low load conditions for extended periods,
the solenoid is cycled as follows while the chiller is
running for P, Q and H9 compressors only:
• When the Oil Sump Temperature is less than the
Oil Return Min setpoint, close (de-energize) the Oil
Return Solenoid by de-energizing K12 relay.
• When the Oil Sump Temperature is greater than
the Oil Return Min setpoint + 7°F, open (ener-
gize) the Oil Return Solenoid by energizing K12
relay.
• During coastdown and when not running, the
solenoid operation is not changed from standard
logic, it remains closed.
• During startup the operation is not changed from
standard logic, it remains closed for 1 minute af-
ter System run.
K13 - Compressor Motor Starter (start)
(TB1-6/16)
Contacts close coincident with the beginning of Sys-
tem run. They remain closed for 0.2 seconds and then
open.
K14 - Compressor Motor Stop (stop)
(TB 1-6/16)
Contacts close coincident with the beginning of Sys-
tem run. They remain closed for the duration of System
run. They open coincident with the beginning of Sys-
tem Coastdown.
K15 - (TB1 -34/1)Oil Heater (Style D/E all
compressor codes except P; Variable Speed
Oil Pump)
Contacts are open whenever the Oil Pump is operating.
When the Oil Pump is not operating, the contacts are
operated to maintain the Oil Temperature at a target
value of 50°F above the Condenser Saturated Tem-
perature from a minimum of 110°F to a maximum of
160°F. The contacts close when the Oil Temperature
decreases to 4°F below target value; open at 3°F above
the target value.
On Liquid Line Solenoid (Style "C" (and earlier) chillers,
fixed speed oil pump) the contacts function as follows:
• On Electromechanical and Solid State Starter ap-
plications the Contacts close 1 minute after Sys-
tem run is initiated.
• On Compressor Motor Variable Speed Drive ap-
plications, after the chiller has been running for
greater than or equal to 1 minute the contacts
close if the oil temperature reaches a value greater
than 140°F. They remain closed until the oil tem-
perature decreases to less than 135°F, whereupon
they de-energize.
K16 - High Speed Thrust Solenoid (Style "C"
and earlier chillers; Fixed Speed Oil Pump)
(TB1-62/1)
Contacts close 15 seconds after System run is initiated.
They open on chiller shutdown coincident with the be-
ginning of System Coastdown.
K17 - Condenser Motor Pump Starter (TB1-
164)(If chiller is equipped with Mod B Solid
State Starter, use K5 above)
Contacts operate the same as K14.
K18 - Compressor Motor Starter (TB5-22/25)
Run Status (TB2-35/36)
Contacts operate the same as K14.
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