Energy Management Control System (EMCS) Interface

2.6.4.7

The control system shall be capable of communicating all data to a remote

integrated DDC processor through a single shielded cable. The data shall

include as a minimum all system operating conditions, capacity controls,

and safety shutdown conditions. The control system shall also be capable

of receiving at a minimum the following operating commands.

a.

Remote Unit Start/Stop

b.

[Remote Chilled Water Reset]

c.

[Remote Condenser Water Reset]

2.6.5

Compressor(s)

2.6.5.1

Reciprocating Compressor(s)

Rotating parts shall be statically and dynamically balanced at the factory

to minimize vibration. Compressors shall be capable of operating at

partial-load conditions without increased vibration over the normal

vibration at full load operation and shall be capable of continuous

operation down to the lowest step of unloading as specified. Compressors

of size 7.45 kW 10 horsepower and above shall have an oil lubrication

system of the reversible, forced-feed type with oil strainer. Shaft seal

in open-type units shall be mechanical type. Piston speed for open-type

compressors shall not exceed the manufacturer's recommendation or 6 m/s

1200 fpm, whichever is less. Compressors shall include:

a.

Vertical, V, W, or radial cylinder design

b.

Oil lubrication

c.

Integrally cast block of close-grained iron or cast aluminum block

with hardened steel cylinder sleeves

d.

Oil-level bull's eye

e.

Cast cylinder heads

f.

Cast-aluminum or forged-steel connecting rods

g.

Cast iron or forged-steel crankshaft

h.

Main bearings of the sleeve-insert type

i.

Crankcase oil heaters controlled as recommended by the manufacturer

j.

Suction and discharge refrigerant service valves that are flange

connected, wrench operated, with cap

k.

A strainer on the suction side of the compressor

l.

[A hot-gas muffler to reduce vibration and noise from pulsations]

2.6.5.2

Scroll Compressor(s)

Compressors shall be of the hermetically sealed design. Compressors shall

be mounted on vibration isolators to minimize vibration and noise.

SECTION 15620A

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