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Contractor: P.O.:
Engineer:
Project Name:
Unit Tag:
SD2552WNB 09/16
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Page _____ of _____
ENVISION
2
NKW
REVERSIBLE CHILLER - 50Hz
Engineering Guide Specifi cations
PART 1 - GENERAL
SUMMARY
The liquid source, water-to-water heat pump shall be
a single packaged, reverse-cycle heating/cooling unit.
Each unit shall contain microprocessor control for two
hermetically sealed, scroll compressors with brazed plate
heat exchangers and thermostatic expansion valves.
PERFORMANCE REQUIREMENTS
Fluid Temperature Performance:
Heat Pump shall be capable of continuous operation over the
entire range of entering source-fluid temperature of -1°C –
43°C in cooling mode and -1°C – 32°C in heating mode.
Heat Pump shall be capable of continuous operation over
the entire range of entering load conditions as indicated in
the engineering performance tables.
SUBMITTALS
Product submittal data shall contain manufacturer’s
specifications for heat pumps showing dimensions, weights,
capacities, performance ratings, electrical characteristics,
gauges and finishes of materials and installation instructions.
Submit internal electrical wiring diagrams
Submit Control Diagrams and Specifications
QUALITY ASSURANCE
Liquid source, water-water heat pumps shall be tested, rated,
and certified in accordance with the following standards.
•
ASHRAE 15 for safety code for mechanical refrigeration.
•
ASHRAE 147 for refrigerant leaks, recovery, and
handling and storage requirements.
•
ASHRAE 90.1 – minimum Energy Efficiency compliance
for water-to-water heat pumps.
•
Comply with NFPA 70 or National Electric Code (N.E.C)
•
Comply with UL 1995 and be nationally recognized
with ETL
•
Tested in accordance with EN14511 13256-2
Each unit shall be run tested at the factory using water.
Quality control system shall automatically perform via
computer: triple leak check, pressure tests, evacuate and
accurately charge system, perform detailed heating and
cooling mode tests, and quality cross check all operational
and test conditions to pass/fail criteria. Units tested without
water flow are not acceptable.
WARRANTY
Standard Warranty: The units shall be warranted by the
manufacturer against defects in materials and workmanship
for a period of 12 months from startup or 18 months
from shipment.
Special Warranty: Manufacturer's standard form in which
manufacturer agrees to repair or replace components
of chillers that fails in materials or workmanship within
specified warranty period.
Extended warranties include, but are not limited to,
the following:
•
Complete heat pump including refrigerant and oil charge.
•
Complete compressor and drive assembly.
• Parts
only.
PART 2 - PRODUCTS
WATER TO WATER HEAT PUMP EQUIPMENT
Heat pump equipment shall be factory assembled with
two refrigerant circuits consisting of scroll compressors,
brazed-plate heat exchangers for the evaporator and
condenser, microprocessor controls, and safety devices
such as refrigerant pressure switches. Units must be
field installed with a minimum of a differential waterside
pressure switch or flow proving switch on the outlet of the
load and source piping.
Frame & Enclosure
Frame shall be constructed of 10 gauge welded steel with
forklift pockets in the bottom channel and threaded weld
nuts for lifting points in the top of the frame.
Enclosure shall be factory installed and constructed of
heavy-gauge G60 galvanized steel coated with polyester
powder coat paint. Paint shall be rated for 1,000 hour
of salt spray using ASTM B117. Panels, other than control
service door, shall be lined with 50.8mm inch thick, glass
fiber glass insulation with an foil face, washable backing.
Compressor:
1.
Hermetically sealed, scroll compressors with factory
charged POE or PVE oil.
2.
Suction gas cooled motors operate at 3500 rpm
protected by internal overload device. Model sizes 150
protected by external compressor protection module.
3.
Brazed connections to system piping utilizing braided
stainless steel vibration absorbers on all suction and
discharge piping to mitigate vibration.
4.
Compressors can be operated separately to provide
staged capacity for lighter load conditions.
5.
Factory mounted with rubber isolation grommets.
6.
Acoustically insulated sound blankets are factory
installed around the compressor to reduce sound
emanating from the compressor.
