Daikin WMC Specifications download pdf (Page 57)

Catalog 602-2 57

2. The motor shall be of the semi-hermetic type, of sufficient size to efficiently fulfill compressor

horsepower requirements. It shall be liquid refrigerant cooled with internal thermal sensing

devices in the stator windings. The motor shall be compatible with variable frequency drive

operation.

1. If unit contains an atmospheric shaft seal, the manufacturer shall provide the following at no

additional charge:

a. 20 year warranty and all preventive maintenance required to maintain the shaft seal

including appropriate disposal of all oil lost through the shaft seal. Such disposal shall be

done in a manner consistent with all Federal, state, and local laws pertaining to disposal

and documentation of appropriate disposal shall be provided

b. Replacement and re-charging on a semi-annual basis, or more often if required, of all oil

lost through the shaft seal

c. 20 year refrigerant replacement warranty for any loss of refrigerant that can be directly

attributable to the failure of the atmospheric shaft seal

2. If the compressor drive motor is an open design the chiller manufacturer shall provide at

no additional charge a self contained air conditioning system in the mechanical space

sized to handle the maximum heat output the open drive motor. The energy required to

operate this air conditioning system shall be added to the chiller power at all rating points

for energy evaluation purposes.

3. If the compressor drive motor uses any form of antifriction bearings (roller, ball, etc) the

chiller manufacturer shall provide the following at no additional charge:

a. A 20 year motor bearing warranty and all preventative maintenance, including

lubrication, required to maintain the bearings as specified in the manufacturer’s operating

and maintenance instructions

b. At start up a three axis vibration analysis and written report which establishes a baseline

of motor bearing condition.

An annual three axis vibration analysis and written report to indicate the trend of bearing

wear.

3. The chiller shall be equipped with an integrated Variable Frequency Drive (VFD) to

automatically regulate compressor speed in response to cooling load and the compressor pressure

lift requirement. Movable inlet guide vanes and variable compressor speed acting together, shall

provide unloading. The chiller controls shall coordinate compressor speed and guide vane

position to optimize chiller efficiency.

4. Each compressor circuit shall be equipped with a line reactor to help protect against incoming

power surges and help reduce harmonic distortion.

B. Evaporator and Condenser:

The evaporator and condenser shall be separate vessels of the shell-and-tube type, designed,

constructed, tested and stamped according to the requirements of the ASME Code, Section VIII.

Regardless of the operating pressure, the refrigerant side of each vessel will bear the ASME stamp

indicating compliance with the code and indicating a test pressure of 1.1 times the working pressure,

but not less than 100 psig. The tubes shall be individually replaceable and secured to the intermediate

supports

without rolling or expanding to facilitate replacement if required.

1. The evaporator shall be flooded type with [0.025 in.] OR [0.028 in.] OR [0.035 in.] wall copper

internally and externally enhanced tubes rolled into carbon steel tubesheets. The water side shall

be designed for a minimum of [150 psig] OR [300 psig]. The refrigerant side shall be designed for

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Daikin WMC Specifications Page 57

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