Carrier 30XW150-400 Start-Up, Operating Limitations, Temperature Limits for Standard Units

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

CAUTION

Do not manually operate contactors. Serious damage to the machine may result.

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.

CAUTION

Brine duty application (below 40 F [4.4 C] LCWT) for chiller normally requires factory modification. Contact a Carrier Representative for details regarding specific applications. Operation below 40 F (4.4 C) LCWT with- out modification can result in compressor failure.

Table 35 — Temperature Limits for Standard Units

	TEMPERATURE	F	C
Maximum Condenser EWT		110	43.3
Minimum Condenser EWT		65	18.3
Maximum Condenser LWT*		118	47.8
Maximum Cooler EWT†		70	21.1
Maximum Cooler LWT		60	15.6
Minimum Cooler LWT**		40	4.4
	LEGEND
EWT	— Entering Fluid (Water) Temperature
LWT	— Leaving Fluid (Water) Temperature

*Temperature limit for high condensing/heat reclaim option units are 140 F (60 C).

†For sustained operation, EWT should not exceed 85 F (29.4 C). **Unit requires brine modification for operation below this

temperature.

VOLTAGE

Main Power Supply — Minimum and maximum acceptable supply voltages are listed in the Installation Instructions.

Unbalanced 3-Phase Supply Voltage — Never operate a motor where a phase imbalance between phases is greater than 2%.

To determine percent voltage imbalance:

	max voltage deviation from
% Voltage Imbalance = 100 x	avg voltage
	average voltage

The maximum voltage deviation is the largest difference between a voltage measurement across 2 legs and the average across all 3 legs.

Example: Supply voltage is 240-3-60.

AB = 243v

BC = 236v

AC = 238v

1. Determine average voltage:

Average voltage =	243+236+238
	3

=717

3

=239

2.Determine maximum deviation from average voltage:

(AB) 243 – 239 = 4 v (BC) 239 – 236 = 3 v (AC) 239 – 238 = 1 v

Maximum deviation is 4 v.

3. Determine percent voltage imbalance:

% Voltage Imbalance = 100 x	4
	239

= 1.7%

This voltage imbalance is satisfactory as it is below the maximum allowable of 2%.

IMPORTANT: If the supply voltage phase imbal- ance is more than 2%, contact the local electric utility company immediately. Do not operate unit until imbalance condition is corrected.

MINIMUM FLUID LOOP VOLUME — To obtain proper temperature control, loop fluid volume must be at least 3 gal- lons per ton (3.25 L per kW) of chiller nominal capacity for air conditioning and at least 6 gallons per ton (6.5 L per kW) for

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