Run Messages - York YK Style H Operation Manual

SECTION 3 - DISPLAY MESSAGES
Vanes Closing Before Shutdown
Displayed while the Pre-rotation Vanes are closing
during a Soft Shutdown. During Soft Shutdowns, the
Vanes are driven fully closed prior to shutting down the
compressor. When the Vane Motor End Switch closes,
indicating the Vanes have fully closed (or 3.5 minutes
have elapsed, whichever occurs first), the Run Signal
is removed from the compressor motor starter and a
System Coastdown is performed. Soft Shutdowns are
initiated by the following:
1. Leaving Chilled Liquid – Low temperature
2. Remote Stop
3. Multi-Unit Cycling – Contacts Open
4. System Cycling – Contacts Open
5. Control Panel – Schedule
6. Operator Initiated Soft Stop on display
While the Vanes are closing during any Soft Shutdown,
if a Emergency Stop is initiated with the Red E-Stop
Switch or any faults other than those listed above oc-
cur, the Soft Shutdown is terminated and it will imme-
diately perform a System Coastdown.

RUN MESSAGES

Leaving Chilled Liquid Control
The chiller is running, controlling the Leaving Chilled
Liquid to the Leaving Chilled Liquid Temperature Set-
point. There are no system conditions inhibiting this
operation.
Heat Pump – Leaving Chilled Liquid Control
The Heat Pump is running, controlling the Leaving
Chilled Liquid Temperature to the Leaving Chilled
Liquid Temperature Setpoint. In this mode, Heat Pump
Duty is enabled and the Heat Pump Duty Operational
mode setpoint is set to Cooling mode.
Heat Pump – Leaving Condenser Liquid Control
The Heat Pump is running, controlling the Leaving
Condenser Liquid Temperature to the Leaving Con-
denser Liquid Temperature Setpoint. In this mode,
Heat Pump Duty is enabled and the Heat Pump Duty
Operational mode setpoint is set to Heating mode.
166
Current Pulldown Limit
The Pulldown Demand Limit Setpoint timer is in effect
and the Compressor Motor current is greater than or
equal to the Pulldown Demand Current Limit Setpoint
value. The Pre-rotation Vane operation is being inhib-
ited as described in Motor – High Current Limit mes-
sage below.
Motor – High Current Limit
The Compressor Motor current is greater than or equal
to the local or remote Current Limit Setpoint. The Cur-
rent Limit Setpoint is programmed over a range of 30
to 100% of the Chiller Full Load Amps (FLA). When
the motor current increases to the Inhibit Open thresh-
old, the Pre-rotation Vanes are inhibited from further
opening. This prevents a further current rise. If the cur-
rent continues to rise to the Start Close threshold, the
Vanes begin closing until the current falls to the Stop
Close threshold. Automatic Vane operation is resumed
and this message automatically clears when the mo-
tor current decreases to the Allow Open threshold. The
thresholds are different for the various motor starter ap-
plications. To allow field calibration of the CM-2 Cur-
rent Module, pressing the Pre-rotation Vanes OPEN
key in SERVICE access level, starts a 10 minute timer
during which the current limit thresholds are elevated.
Refer to table:
MOTOR CURRENT (%FLA)
ELECTRO-
VANE CONTROL
MECHANICAL/
SOLID STATE
STARTER
On rise, inhibit open
On fall, allow open
On rise, start close
On fall, stop close
An example of current limit is as follows: If a Solid
Sate Starter chiller FLA is 100 Amps, and the Current
Limit Setpoint is 50%, the following will occur:
50 Amps – inhibit vane open
52 Amps – vanes begin closing
51 Amps – vanes stop closing
49 Amps – allow automatic vane control
FORM 160.76-O2
issue date: 6/15/2015
SERVICE
VSD
MODE
100 100 107
98 98 106
104 103 110
102 101 109
JOHNsON CONtROLs