Operating instructions
30
BRINE OR GLYCOL OPERATION — Configure the unit
for Cooler Fluid Type (Cooler Fluid Type, FLUD) to brine for
brine or glycol chilled water loops. This option will allow for a
set point temperature range of 14 to 60 F (–10.0 to 15.5 C).
Before configuring this selection, confirm that a suitable anti-
freeze has been added and is at a sufficient concentration to
protect the loop. Additionally, the Brine Freeze Set Point
(Brine Freeze Setpoint, LOSP) must be set for proper freeze
protection operation. Set the Brine Freeze Set Point to the burst
protection provided by the glycol concentration. This value
will be Freeze Point for the fluid.
To configure this option with the Touch Pilot display:
To configure this option with the Navigator display:
Cooler Pump Control — It is required for flooded
cooler units that cooler pump control be utilized on all chillers
unless the chilled water pump runs continuously or the chilled
water system contains a suitable antifreeze solution. The 30XA
units can be configured for single external pump control as
standard. Control of dual external pumps requires installation
of the external pump control accessory package (Part No.
00EFN900003200A).
Cooler Pumps Sequence (Cooler Pumps Sequence,
PUMP) is the variable that must be confirmed in the field.
Proper configuration of the cooler pump control is required to
provide reliable chiller operation. Pump control can be accom-
plished for both on-board and external pumps. For external
pump control, control connections to the pump contactor and a
feedback circuit from the contactor must be supplied. The
Cooler Pumps Sequence configuration can be set to 5 different
control settings: No Pump Control, Single Pump Control, Dual
Pump Control, Pump 1 Manual, and Pump 2 Manual.
When the Cooler Pumps Sequence is configured, the cooler
pump output will be energized when the chiller enters an “ON”
mode. The cooler pump output is also energized when certain
alarms are generated. The cooler pump output should be used
as an override to the external pump control if cooler pump con-
trol is not utilized. The cooler pump output is energized if a
P.01 Water Exchanger Freeze Protection alarm is generated,
which provides additional freeze protection if the system is not
protected with a suitable antifreeze solution.
A chilled water pump interlock contact PMP-I is connected
across TB5 terminals 1-2, as an alternative to the standard
jumper. This interlock is an optional field-installed device
which would provide extra protection in the event of the flow
switch failing closed. It may be used regardless of whether or
not pump control is enabled. However, this interlock should
NOT be confused with the pump contactor feedback auxiliary
contacts which MUST be wired to MBB channel 18 at connec-
tor J5C if the pump control feature is enabled (with or without
the optional on-board hydronic package).
NO PUMP CONTROL — The factory default setting for
Cooler Pumps Sequence (Cooler Pumps Sequence, PUMP)
is 0 (No Pump), for units without the factory-installed hydronic
package.
When Cooler Pumps Sequence is set to 0 (No Pump), clo-
sure of both the chilled water flow switch (CWFS) and the
chilled water pump interlock contact (connected across TB-5
terminals 1 and 2) are required for the unit to start mechanical
cooling.
To configure this option with the Touch Pilot™ display:
To configure this option with the Navigator™ display:
SINGLE PUMP CONTROL — For units with the single
pump hydronic package, the factory default setting for Cooler
Pumps Sequence (Cooler Pumps Sequence, PUMP) is 1
(1 Pump Only). This control algorithm may be used to control
an external pump, as long as the same controls are applied as
noted below.
When the Cooler Pumps Sequence configuration is set to 1
Pump Only, closure of both the chilled water flow switch
(CWFS) and the chilled water pump interlock contact (con-
nected across TB-5 terminals 1 and 2) are required for the unit
to start mechanical cooling. Additionally, the normally open
auxiliary contacts for Pump 1 contactor must be connected to
the violet and pink wires located in the harness from the MBB-
J5C-CH18 connector. The wires in the harness are marked
“PMP1-13” and “PMP1-14”. See the field wiring diagram in
the 30XA Installation Instructions.
Three additional parameters are configurable for pump con-
trol with single pump control. Periodic pump start and check
flow if pump is off parameters can customize the pump opera-
tion for the application. Another parameter, to stop the pump in
standby mode is not supported.
The control system has the ability to periodically start the
pumps to maintain the bearing lubrication and seal integrity. If
Periodic Pump Start (Pump Sticking Protection, PM.PS) is
set to YES and the unit is off at 2:00 PM, the pump will be
started once each day for 2 seconds. The default for this option
is NO.
Another configuration to check the status of the chilled
water flow switch can be selected. When configured, if Flow
Checked if Pump Off (Flow Checked if C Pump Off, P.LOC)
is set to YES, the control will monitor the chilled water flow
switch status and will alarm if the pump is commanded off and
the chilled water flow switch is closed. This can provide the
user with information of a faulty cooler pump contactor or a
failed chilled water flow switch. This parameter should be set
to NO for series flow machines. The factory default for this
item is YES.
To configure this option with the Touch Pilot display:
DISPLAY
NAME
PAT H
LINE
NO.
VALUE
Cooler Fluid
Type
Main Menu
ServiceSERVICE1
12 = Brine
Brine Freeze
Setpoint
Main Menu
ServiceSERVICE1
3
Dependent on
fluid concentration
ITEM ITEM EXPANSION PATH VALUE
FLUD Cooler Fluid Type Configuration
SERV Brine
LOSP
Brine Freeze
Setpoint
ConfigurationSERV
Dependent on
fluid concentration
DISPLAY NAME PATH
LINE
NO.
VALUE
Cooler Pumps
Sequence
Main
Menu
ConfigUSER
8
0 (No Pump
Control)
ITEM ITEM EXPANSION PATH VALUE
PUMP
Cooler Pumps
Sequence
Configuration
OPTN No Pump
DISPLAY NAME PATH
LINE
NO.
VALUE
Cooler Pumps
Sequence
Main
Menu
ConfigUSER
8
1 (Single
Pump Control)
Pump Sticking
Protection
Main
Menu
ConfigUSER
15
Default = No
No = Disabled
Ye s = E n a b l e d
Flow Checked
if C Pump Off
Main
Menu
ConfigUSER
17
Default = Yes
No = Disabled
Ye s = E n a b l e d