72
RB SERIES ENGINEERING GUIDE
Engineering Guide Specifi cations
eneral
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 specifi cations that follow. The reverse cycle
heating/cooling units shall be either suspended type with horizontal
air inlet and discharge or fl oor mounted type with horizontal air
inlet and vertical upfl ow air discharge. Units shall be AHRI/ISO
13256-1 certifi ed 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 verifi ed 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. The interior shall be insulated with 1/2 in. thick, multi-density,
cleanable aluminum foil coated glass fi ber with edges sealed or
tucked under fl anges to prevent the introduction of glass fi bers 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.
duct collar shall be provided on the supply air opening. Standard
size 1 in. [2.54 cm] MERV 4 fi lters shall be provided with each
unit. Units shall have a return air fi lter rack that is fi eld convertible
from 1 in. [2.54 cm] to 2 in. [5.1 cm]. The upfl ow 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.
Option: AlpinePure MERV 13 Filter - A 2 in. thick [51 mm] MERV
13 fi lter can help fulfi ll 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
fi lter (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.
ption: An internally mounted automatic
ow regulator shall be
set to 3 gpm/ton to deliver optimal fl ow 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, fi nned tube air-to-
refrigerant heat exchanger, reversing valve, coaxial tube water-to-
refrigerant heat exchanger, and service ports.
Compressors shall be high-effi ciency single speed rotary or scroll
type designed for heat pump duty and mounted on vibration
isolators. 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 fi ns bonded to rifl ed aluminum tubes in a
staggered pattern not less than three rows deep for enhanced
performance. The all-aluminum air coil is not susceptible to
formicary corrosion.
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 inner tube and a steel outer tube. Refrigerant to air heat
exchangers shall utilize enhanced corrugated lanced aluminum
fi ns and rifl ed 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.
Blower Motor and Assembly
The blower shall be a direct drive centrifugal type with a
dynamically balanced wheel. The housing and wheel shall be
designed for quiet low outlet velocity operation. The blower
housing shall be removable from the unit without disconnecting the
supply air ductwork for servicing of the blower motor. The blower
motor shall be isolated from the housing by rubber grommets.
The motor shall be permanently lubricated and have thermostatic
overload protection.
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