low voltage terminal block for field control wiring.]
n.
Space Temperature Controls: Provide electronic multi-stage,
auto-changeover, adjustable thermostats with
OFF-HEAT-AUTO-COOL-EMERGENCY system switch and AUTO-ON fan switch.
Thermostats shall be furnished by the unit manufacturer. Provide
relays, transformers, contractors, and control wiring between
thermostats and unit. Thermostats shall read out in degrees C and
degrees F.
**************************************************************************
NOTE: Plate heat exchangers are required in systems
using closed circuit coolers or cooling towers to
isolate the ground heat exchanger loops from the
building terminal loops.
**************************************************************************
2.1.2
Water-Source Water-to-Water Heat Pumps (WWHP)
**************************************************************************
NOTE: In compliance with FEMP/Energy Star
requirements, units 19040 Wshall have minimum SEER
of 14.1 and minimum heating performance COP of 3.3.
Indicate the equipment operating requirements,
including efficiency, on the drawings.
**************************************************************************
[Provide water-source water-to-water heat pump units factory assembled.]
[Provide ground-coupled closed-loop water-to-water heat pump (extended
range) units factory assembled.] Units shall be listed by ETL, or listed
in ARI directory. Units shall include compressor, reversing valve,
expansion valve, refrigerant-to-water condensing coil, refrigerant-to-water
evaporator coil, [desuperheater], hose kits, and controls.
a.
Cabinet: Provide manufacturer's standard galvanized steel cabinet
finished with corrosion resistant epoxy coating or lacquer
acrylic. Provide access panels for inspection and access to
internal parts. Insulate cabinet with minimum 12 mm 1/2 inch
multi-density, fiberglass insulation. Provide copper or stainless
steel female threaded pipe connections for supply water and return
water connections; these connections shall be mechanically
fastened to the cabinet. Water piping shall be insulated.
b.
Compressor: Provide hermetically sealed type compressor,
installed on vibration isolators enclosed in an acoustically
treated enclosure. Provide high and low pressure switches, low
suction temperature cut-out, motor thermal overload protection, 5
minute anti-recycle timer, and start capacitor kit. Provide
capability to reset compressor lockout circuit at the remote
thermostat and at the disconnect. [Provide units with factory
installed sound attenuation package.]
c.
Reversing Valve: Provide solenoid activated refrigerant reversing
valves energized only during the cooling mode and designed to fail
in the heating position.
d.
Refrigerant-to-Water Heat Exchangers: Provide
refrigerant-to-water heat exchangers of coaxial type, with inner
cupronickel water tube and outer steel refrigerant tube. Heat
SECTION 15741N
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