Daikin WMC Specifications download pdf (Page 58)

58 Catalog 602-2

a minimum of 200 psi. Provide intermediate tube supports at a maximum of 24 inch spacing. The

heads shall be [carbon steel] OR [epoxy-coated steel]. Water connections shall be [grooved

suitable for Victaulic couplings] OR [flanged connections]. The evaporator shall have [dished

heads with valved drain and vent connections] OR [shall be equipped with marine water boxes

with removable covers and vent and drain connections]. The evaporator shall have [right-hand]

OR [left-hand] connections when looking at the unit control panel.

2. The condenser shall have [(0.025 in) OR (0.028 in.) OR (0.035 in.) wall copper] OR [(0.028 in.) or

(0.035 in.) wall 90-10 cupro-nickel] internally and externally enhanced tubes rolled into carbon

steel. Water connections shall be [grooved suitable for Victaulic couplings] OR [flanged]. The

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

be designed for a minimum of 200 psi. Provide intermediate tube supports at a maximum of 24

inch spacing. The condenser shall have [dished heads with valved drain and vent connections] OR

[shall be equipped with marine water boxes with removable covers and vent and drain

connections]. The heads shall be [carbon steel] OR [epoxy-coated steel]. The condenser shall have

[right-hand] OR [left-hand] connections when looking at the unit control panel.

3. Provide sufficient isolation valves and condenser volume to hold the full unit refrigerant charge

the condenser at 90ºF in accordance with ANSIASHRAE 15.A during servicing or provide a

separate pumpout system and storage tank sufficient to hold the charge of the largest unit being

furnished.

4. An electronic expansion valve shall control refrigerant flow to the evaporator. Fixed orifice

devices or float controls with hot gas bypass are not acceptable because of inefficient control at

low load conditions. The liquid line shall have moisture indicating sight glass.

5. Re-seating type spring loaded pressure relief valves according to ASHRAE-15 safety code shall be

furnished. The evaporator shall be provided with single or multiple valves. The condenser shall be

provided with dual relief valves equipped with a transfer valve so one relief valve can be removed

for testing or replacement without loss of refrigerant or removal of refrigerant from the condenser.

Rupture disks are not acceptable. If rupture disks are required on negative pressure units to

prevent air and moisture ingress, then factory mounted spring loaded pressure relief valves shall be

provided in series with the rupture disks to contain the remaining refrigerant in the event of vessel

over-pressurization. The space between the rupture disk and the relief valve shall include a

suitable telltale indicator integrated into the chiller control system to alert the operator that a

potential safety issue exists in the pressure relief system.

6. [OPTIONAL] The evaporator, including water heads, suction line, and any other component or

part of a component subject to condensing moisture shall be insulated with UL recognized [3/4

inch] OR [1 ½ inch] closed cell insulation. All joints and seams shall be carefully sealed to form a

vapor barrier.

7. Provide factory-mounted and wired, thermal-dispersion water flow switches on each vessel to

prevent unit operation with no or low water flow. Paddle and pressure differential type switches

are not acceptable due to high rates of failure and false indications from these types of flow

indicators.

C. Long Term Reliability

1. All compressor/motor designs that require oil to lubricate their respective roller/ball bearing

system must denote exactly how many gallons of oil are required for safe operation. The

manufacturer must then provide the engineer and owner with a real world energy analysis

showing the energy degradation over time due oil contamination of heat transfer surfaces

2. Chillers containing oil shall include at no additional charge a 10 year parts and labor warranty

on all oil system components including:

 Pumps  Starter

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Daikin WMC Specifications Page 58

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