Daikin WMC Specifications download pdf (Page 60)

60 Catalog 602-2

7. The chiller shall be capable of cycling and loading up to three other similar chillers through a local

network and also automatic control of evaporator and condenser pumps (primary and standby), up

to 3 stages of cooling tower fan cycling control and a tower modulating bypass valve or cooling

tower fan variable frequency drives.

8. [OPTIONAL] The factory mounted controller(s) shall support operation on a BACnet®,

Modbus® or LONWORKS® network via one of the data link / physical layers listed below as

specified by the successful Building Automation System (BAS) supplier.

• Modbus

• BACnet MS/TP master (Clause 9)

• BACnet IP, (Annex J)

• BACnet ISO 8802-3, (Ethernet)

• LonTalk® FTT-10A. The unit controller shall be LONMARK ® certified.

9. The information communicated between the BAS and the factory mounted unit controllers shall

include the reading and writing of data to allow unit monitoring, control and alarm notification as

specified in the unit sequence of operation and the unit points list.

10. For chillers communicating over a LONMARK network, the corresponding LONMARK eXternal

Interface File (XIF) shall be provided with the chiller submittal data.

11. All communication from the chiller unit controller as specified in the points list shall be via

standard BACnet objects. Proprietary BACnet objects shall not be allowed. BACnet

communications shall conform to the BACnet protocol (ANSI/ASHRAE135-2001). A BACnet

Protocol Implementation Conformance Statement (PICS) shall be provided along with the unit

submittal.

12. The factory supplied VFD and controls should include the following:

 High short circuit panel rating of [35 kA (standard)] OR [65kA at 460V (optional)] with a

field-supplied matching disconnect switch

 Phase loss protection

 Under/over voltage protection

 [OPTIONAL] Ground Fault Protection to reduce the arcing ground fault damage from line-to-

ground fault currents less than those required for conductor protection

 [OPTIONAL] EMI filters to reduce radio frequency interference

13. Energy saving software logic shall at a minimum offer the following

 User programmable compressor soft loading

 Chilled water reset

 Demand limit control

 Staging options lead lag between multiple compressors on a single chiller or up to two other

similar chillers.

 Plotting of historic trends for optimizing efficiency

2.5. OPTIONAL ITEMS

The following optional items shall be furnished:

1. [Open] OR [Closed] export crate

2. Pumpout unit, with or without storage vessel

3. Refrigerant monitor

4. OSHPD Certification: The chiller shall be OSHPD Pre-Approved per OSP–0116-10 and be so labeled. The

chiller shall meet a minimum seismic design spectral response acceleration of 1.60 S

. The chiller must

be mounted to a rigid base and may use neoprene waffle vibration pads.

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Daikin WMC Specifications Page 60

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