Specifications

47
If the unit is configured as a heat machine, the valve will be
maintained fully open when the unit operates in heating mode
and when the condenser leaving water temperature becomes
greater than the head pressure set point.
Maximum and minimum condenser valve position is con-
figurable. The minimum condenser valve position is very im-
portant to avoid condenser freeze risks as condenser freeze pro-
tection is ensured by the condenser pump.
To configure this option with the Touch Pilot™ display:
To configure this option with the Navigator™ display:
NOTE: Operation of the head pressure control valve can be
verified by entering Quick Test. From the Touch Pilot display,
go to MAIN MENU\Status\QCK_TST2\Q_3W_VLV. The
Quick Test is not avaialble from Navigator display.
PRE-START-UP
Do not attempt to start the chiller until the following checks
have been completed.
System Check
1. Check to ensure the unit is level per the installation
instructions.
2. Electrical power source must agree with unit nameplate.
3. Check that auxiliary components, such as the chilled fluid
and condenser fluid circulating pumps, air-handling
equipment, or any other equipment to which the chiller
supplies liquid are operational. Consult manufacturer's in-
structions. If the unit has field-installed accessories, be
sure all are properly installed and wired correctly. Refer
to unit wiring diagrams.
4. Open compressor suction service valves (if equipped).
5. Open discharge, liquid line, oil line, and economizer (if
equipped) service valves.
6. Fill the chiller fluid circuit with clean water (with recom-
mended inhibitor added) or other non-corrosive fluid to
be cooled. Bleed all air out of high points of system. If
unit is exposed to temperatures below 32 F (0° C), suffi-
cient inhibited propylene glycol or other suitable corro-
sion inhibited antifreeze should be added to the chiller
water and condenser water circuit to prevent possible
freeze-up. The chilled water loop must be cleaned before
the unit is connected. To set the maintenance time for
cleaning and inspecting loop strainers, go to Water Filter
Ctrl (days), W.FIL. Values for this item are counted as
days. Refer to the system pump package literature for
specific internal inspection/cleaning requirements.
7. Check tightness of all electrical connections.
8. Verify power supply phase sequence. The phase sequence
should be A-B-C for proper compressor rotation.
START-UP
Actual Start-Up —
Actual start-up should be done only
under supervision of a qualified refrigeration technician.
1. Be sure all discharge, oil, and suction valves (if equipped)
and liquid line service valves are open.
2. Using the unit control, set leaving-fluid set point (Cool-
ing Setpoint 1, CSP.1). No cooling range adjustment is
necessary.
3. If optional control functions or accessories are being
used, the unit must be properly configured. Refer to
Configuration Options section for details.
4. Start the chilled fluid and condenser pumps, if unit is not
configured for pump control. (Cooler Pumps Sequence,
PUMP=0; Condenser Pump Sequence, HPUM = No)
5. Complete the Start-Up Checklist to verify all components
are operating properly.
6. Check the cooler flow switch for proper operation. En-
sure that the flow switch input indicates closed when the
pump is on and open when the pump is off.
7. Turn Enable/Off/Remote contact switch to Enable position.
8. Allow unit to operate and confirm that everything is
functioning properly. Check to see that leaving fluid
temperature agrees with leaving set point Control Point
(Control Point, CTPT).
Operating Limitations
TEMPERATURES — Unit operating temperature limits are
listed in Table 35.
Low Condenser Water Temperature Operation
— For con-
denser entering water temperatures between 33 F (0.6 C) and
65 F (18.3 F), field installed accessory head pressure control
valve is required. Contact your Carrier representative for
details.
DISPLAY NAME PATH LINE NO. VALUE
Condenser Water
Val Sel
Service FACTORY 13 YES
Water Val
Condensing Stp
Setpoint 38
Range: 80 to120 F
(26.7 to 48.9 C)
Default: 86 F (30 C)
Recl Valve Min
Position
Service SERVICE1 19
Range: 0 to 50%
Default: 20%
Recl Valve Max
Position
Service SERVICE1 20
Range: 20 to 100%
Default: 100%
Prop PID Gain
Varifan
Service SERVICE1 6
Range: -20 to 20
Default: 2.0
Int PID Gain
Varifan
Service SERVICE1 7
Range: -5.0 to 5.0
Default: 0.2
Deri PID Gain
Varifan
Service SERVICE1 8
Range: -20 to 20
Default: 0.4
ITEM ITEM EXPANSION PATH VALUE
CON.V
Condenser Valve
Select
Configuration UNIT YES
W.SCT Water Val Cond Stp Setpoint MISC
Range: 80 to140 F
(26.7 to 60 C)
Default: 86 F (30 C)
HR.MI
Reclaim Water Valve
Min
Configuration SERV
Range: 0 to 50%
Default: 20%
HR.MA
Reclaim Water Valve
Max
Configuration SERV
Range: 20 to 100%
Default: 100%
HD.PG
Varifan Proportion
Gain
Configuration SERV
Range: –10 to 10
Default: 2.0
HD.DG
Varifan Derivative
Gain
Configuration SERV
Range: –10 to 10
Default: 0.4
HD.IG Varifan Integral Gain Configuration SERV
Range: –10 to 10
Default: 0.2
IMPORTANT: Complete the Start-Up Checklist
for 30XW Liquid Chillers at the end of this publication.
The checklist assures proper start-up of a unit, and
provides a record of unit condition, application
requirements, system information, and operation at
initial start-up.
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CAUTION
Do not manually operate contactors. Serious damage to the
machine may result.
CAUTION
Brine duty application (below 40 F [4.4 C] LCWT) for
chiller normally requires factory modification. Contact
your Carrier Representative for details regarding spe-
cific applications. Operation below 40 F (4.4 C) LCWT
without modification can result in compressor failure.