Specifications

81
RG SERIES ENGINEERING GUIDE
Engineering Guide Specifi cations
General
Furnish and install water source heat pumps as indicated on
the plans. Equipment shall be completely assembled, piped and
internally wired. Capacities and characteristics as listed in the
schedule and the specifications that follow. The reverse cycle
heating/cooling units shall be either suspended type with horizontal
air inlet and discharge or floor mounted type with horizontal air
inlet and vertical upflow air discharge. Units shall be AHRI/ISO
13256-1 certified and listed by a nationally recognized safety-
testing laboratory or agency, such as ETL Testing Laboratory. Each
unit shall be computer run-tested at the factory with conditioned
water and operation verified to catalog data. Each unit shall be
mounted on a pallet and shipped in a corrugated box or stretch-
wrapped. The units shall be designed to operate with entering liquid
temperature between 20°F and 120°F [-6.7°C and 48.9°C].
Casing and Cabinet
The cabinet shall be fabricated from heavy-gauge galvanized steel
and finished with optional corrosion-resistant powder coating. This
corrosion protection system shall meet the stringent 1000 hour
salt spray test per ASTM B117. The interior shall be insulated with
1/2 in. thick, multi-density, cleanable aluminum foil coated glass
fiber with edges sealed or tucked under flanges to prevent the
introduction of glass fibers into the discharge air. Standard cabinet
panel insulation must meet NFPA 90A requirements, air erosion
and mold growth limits of UL-181, stringent fungal resistance
test per ASTM-C1071 and ASTM G21, and shall meet zero level
bacteria growth per ASTM G22. Unit insulation must meet these
stringent requirements or unit(s) will not be accepted.
One (horizontal) to two (vertical) blower and two compressor
compartment access panels shall be ‘lift-out’ removable with supply
and return ductwork in place.
A duct collar shall be provided on the supply air opening. Standard
size 1 in. [2.54 cm] MERV 4 filters shall be provided with each
unit. Units shall have a return air filter rack that is field convertible
from 1 in. [2.54 cm] to 2 in. [5.1 cm]. The upflow vertical units shall
have a removable insulated divider panel between the air handling
section and the compressor section to minimize the transmission
of compressor noise and to permit operational service testing
without air bypass. Vertical units shall be supplied with left or
right horizontal air inlet and top vertical air discharge. Horizontal
units shall be supplied with left or right air inlet and side or end air
discharge.
The compressor shall be double isolation mounted using selected
durometer grommets to provide vibration free compressor mounting.
The compressor mounting bracket shall be acoustically deadened
galvanized steel to prevent vibration transmission to the cabinet.
Option: AlpinePure MERV 13 Filter - A 2 in. thick [51 mm] MERV
13 filter can help fulfill a credit under the LEED Rating System. Its
low initial resistance promotes low energy consumption (0.21 in.
w.g. @ 300 fpm) and provides nearly twice the life of a standard
filter (300 fpm vs. standard 500 fpm application).
Option: A Super Quiet Sound package shall include multi-density
full coverage compressor blanket.
Option: An internally mounted low pressure drop (high Cv)
water solenoid valve shall be factory installed for use in variable
speed pumping applications.
Option: An internally mounted automatic flow regulator shall
be set to 3 gpm/ton to deliver optimal flow to the unit.
Refrigerant Circuit
All units shall utilize the non-ozone depleting and low global
warming potential refrigerant R-410A. All units shall contain a
sealed refrigerant circuit including a hermetic motor-compressor,
bidirectional thermostatic expansion valve, finned tube air-to-
refrigerant heat exchanger, reversing valve, coaxial tube water-to-
refrigerant heat exchanger, optional hot water generator coil, and
service ports.
Compressors shall be high-efficiency single speed rotary or scroll
type designed for heat pump duty and mounted on vibration
isolators. The compressor shall be double isolation mounted using
selected durometer grommets to provide vibration free compressor
mounting. Compressor motors shall be single-phase PSC with
overload protection.
The air coil shall be sized for low-face velocity and constructed of
lanced aluminum fins bonded to rifled aluminum tubes in a staggered
pattern not less than three rows deep for enhanced performance.
Option: AlumiSeal electro-coated air coil
The coaxial water-to-refrigerant heat exchanger shall be designed
for low water pressure drop and constructed of a convoluted copper
(cupronickel option) inner tube and a steel outer tube. Refrigerant
to air heat exchangers shall utilize enhanced corrugated lanced
aluminum fins and rifled copper tube construction rated to
withstand 600 psig (4135 kPa) refrigerant working pressure.
Refrigerant to water heat exchangers shall be of copper inner water
tube and steel refrigerant outer tube design, rated to withstand 600
psig (4135 kPa) working refrigerant pressure and 450 psig (3101
kPa) working water pressure. The thermostatic expansion valve
shall provide proper superheat over the entire liquid temperature
range with minimal “hunting.” The valve shall operate bidirectionally
without the use of check valves.
Option: Cupronickel refrigerant to water heat exchanger shall
be of copper-nickel inner water tube and steel refrigerant outer
tube design, rated to withstand 600 psig (4135 kPa) working
refrigerant pressure and 450 psig (3101 kPa) working water
pressure. Water lines shall also be of cupronickel construction.
Option: Hot water generator - Internal double wall vented hot
water generator coil refrigerant to water heat exchangers shall be
of copper inner water tube and steel refrigerant outer tube design,
rated to withstand 600 psig (4135 kPa) working refrigerant pressure
and 450 psig (3101 kPa) working water pressure.