Operating instructions

31
To configure this option with the Navigator display:
DUAL PUMP AND MANUAL CONTROL — For units with
the dual pump hydronic package, the factory default setting for
Cooler Pumps Sequence (Cooler Pumps Sequence, PUMP)
is 2 (2 Pumps Auto). This control algorithm may be used to
control two external pumps, as long as the same controls are
applied as noted below. For dual pump hydronic option units,
three control options exist. The control will start the pumps and
automatically alternate the operation of the pumps to even the
wear of the pumps based on the hours configured under Pump
Auto Rotation Delay (Pump Auto Rotation Delay, ROT.P). If
the difference between the operating hours of the 2 pumps ex-
ceeds the Pump Auto Rotation Delay the lead pump will
change. If a flow failure is detected, the other pump will at-
tempt to start.
Two manual control options also exist. When the Cooler
Pumps Sequence (Cooler Pumps Sequence, PUMP) is set to
3 (PMP 1 Manual), Cooler Pump 1 will always operate. When
the Cooler Pumps Sequence (Cooler Pumps Sequence,
PUMP) is set to 4 (PMP 2 Manual), Cooler Pump 2 will al-
ways operate.
If the Cooler Pumps Sequence configuration is set to 2
(2 Pumps Auto), 3 (PMP 1 Manual), or 4 (PMP 2 Manual),
closure 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. Additionally, the normally open auxiliary contacts for
Pump 1 and Pump 2 contactors (wired in parallel) must be con-
nected 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 dia-
gram in the 30XA Installation Instructions.
Three additional parameters are configurable for pump con-
trol with single pump control. The Periodic Pump Start (Pump
Sticking Protection, PM.PS) and Flow Checked if Pump Off
(Flow Checked if C Pump Off, P.LOC) parameters can cus-
tomize the pump operation for the application. Another param-
eter, that is used 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 if the unit is off at 2:00 PM, a pump will be
started once each day for 2 seconds. If the unit has 2 pumps,
Pump 1 will be started on even days (such as day 2, 4, or 6 of
the month); Pump 2 will be started on odd days (such as day 1,
3 or 5 of the month). The default for this option is NO.
A configuration to check the status of the chilled water flow
switch can be selected. When Flow Checked if Pump Off
(Flow Checked if C Pump Off, P.LOC) is configured 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 these options with the Touch Pilot™ display:
To configure these options with the Navigator™ display:
Machine Start Delay — An option to delay the start of
the machine is also available. This parameter is useful in keep-
ing multiple machines from starting at the same time in case of
a power failure. The parameter has a factory default of
1 minute. This parameter also has a role in the timing for a
chilled water flow switch alarm.
To configure this option with the Touch Pilot display:
To configure this option with the Navigator display:
Circuit/Compressor Staging and Loading —
The AquaForce
®
30XA chillers employ one compressor per
circuit. As a result, circuit and compressor staging are the
same. The control has several control option parameters to load
the compressors. The circuit/compressor start can be config-
ured as well as the loading of each circuit/compressor.
CIRCUIT/COMPRESSOR STAGING — The control can be
configured to decide which circuit/compressor starts first, by
configuring Lead/Lag Circuit Select (Staged Loading
Sequence, LLCS). Four options for this variable are allowed:
Automatic Lead-Lag, Circuit A Leads, Circuit B Leads, or
Circuit C Leads (30XA400-500 only). The factory default is
Automatic Lead-Lag.
The automatic lead-lag function determines which circuit/
compressor starts. When enabled, the control will determine
which circuit/compressor starts to even the wear of the com-
pressor. The compressor wear factor (combination of starts and
run hours) is used to determine which compressor starts.
Compressor Wear Factor = (Compressor Starts) + 0.1 (Com-
pressor Run Hours)
The circuit/compressor with the lowest compressor wear
factor is the circuit that starts first.
If starting a particular circuit/compressor first is desired, that
can also be configured with the same variable.
ITEM ITEM EXPANSION PATH VALUE
PUMP
Cooler Pumps
Sequence
ConfigurationOPTN 1 Pump Only
PM.PS
Periodic Pump
Start
Configuration
OPTN
Default = No
No = Disabled
Ye s = E n a b l e d
P.LO C
Flow Checked
if Pmp Off
Configuration
OPTN
Default = Yes
No = Disabled
Ye s = E n a b l e d
DISPLAY NAME PATH
LINE
NO.
VALUE
Cooler Pumps
Sequence
Main Menu
ConfigUSER
8
2 (2 Pumps Automatic)
3 (Pump 1 Manual)
4 (Pump 2 Manual)
Pump Auto
Rotation Delay
Main Menu
ConfigUSER
14 Default = 48 hours
Pump Sticking
Protection
Main Menu
ConfigUSER
15
Default = No
No = Disabled
Yes = Enabled
Flow Checked
if C Pump Off
Main Menu
ConfigUSER
17
Default = Yes
No = Disabled
Yes = Enabled
ITEM ITEM EXPANSION PATH VALUE
PUMP
Cooler Pumps
Sequence
Configuration
OPTN
2 Pumps Auto
PMP1 Manual
PMP2 Manual
ROT.P
Pump Rotation
Delay
ConfigurationOPTN
Default =
48 hours
PM.PS
Periodic Pump
Start
Configuration
OPTN
Default = No
No = Disabled
Yes = Enabled
P.L O C
Flow Checked
if Pmp Off
Configuration
OPTN
Default = Yes
No = Disabled
Yes = Enabled
DISPLAY NAME PATH
LINE
NO.
VALUE
Unit Off to
On Delay
Main Menu
ConfigUSER
6 Default = 1 Minute
ITEM ITEM EXPANSION PATH VALUE
DELY Minutes Off Time Configuration
OPTN
Default =
1 Minute