Chiller exterior surfaces shall be factory painted, finished, and insulated
as applicable. Chiller shell shall be of carbon steel construction with
cast iron or welded steel heads. Evaporator, absorber, condenser,
generator(s), and heat exchanger(s) shall be of the shell-and-tube type
construction and be in accordance with ASME BPVC SEC VIII D1. Evaporator,
absorber, condenser, and heat exchanger tubes shall be shall be seamless
copper or cupronickel (CuNi). [First stage generator tubes shall be
seamless Type 409 stainless steel or cupronickel. Second stage generator]
[Generator] tubes shall be seamless cupronickel. Tubes shall be
individually replaceable. Water boxes shall be provided with lifting lugs,
gasketed removable covers, drains, and vents. Unit's internal waterside
components shall be rated for not less than 1,000 kPa 150 psig and factory
tested at 150 percent of design working pressure. Insulation shall be
provided for the refrigerant pump, all exposed chilled water piping, the
absorber shell, the steam or hot water inlet piping.
2.7.6
Combustion Burner Assembly
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NOTE: Delete this paragraph if a direct-fired
absorption chiller is not specified.
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Chiller shall be provided with a forced draft, flame retention type burner
and fuel train assembly. Burner shall be the [single] [dual] fuel type
capable of burning [natural gas] [propane] [and] [number 1 fuel oil]
[number 2 fuel oil] [diesel]. Burner and fuel train shall be listed by the
underwriters laboratories (UL). Burner assembly shall be provided with all
pressure regulators, switches, controls, ignition system, blower fans, and
other devices required for proper and safe operation of the burner. Burner
assembly shall be equipped with an external primary-secondary air ratio
adjustment that allows adjustment without dismantling the burner. Burner
controls shall allow either manual or automatic burner operation. Fuel
changeover shall be accomplished [by a manual fuel changeover switch]
[automatically as indicated].
2.7.7
Controls Package
Chiller shall be provided with a complete factory mounted and prewired
electric or microprocessor based control system. Controls package shall be
[unit-mounted] [floor-mounted where indicated] which contains as a minimum
a digital display or acceptable gauges, an on-auto-off switch, motor
starters, power wiring, control wiring, and disconnect switches. Controls
package shall provide operating controls, monitoring capabilities,
programmable setpoints, safety controls, and EMCS interfaces as defined
below.
2.7.7.1
Operating Controls
Chiller shall be provided with the following adjustable operating controls
as a minimum.
a.
Leaving chilled water temperature control
b.
System capacity control to adjust the unit capacity in accordance
with the system load and the programmable setpoints. Controls
shall automatically re-cycle the chiller on power interruption.
SECTION 15620A
Page 39
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