42
Split System Heat Pump Indoor Unit
(Air-Handling Unit)
HVAC Guide Specifications — Section 15859
Size Range:
3,000 to 6,000 Cfm, Nominal Airflow
7
1
/
2
to 15 Tons, Nominal Cooling
Carrier Model Numbers:
40RMQ
Part 1 — General
1.01 SYSTEM DESCRIPTION
A. Indoor, packaged air-handling unit for use in com-
mercial heat pump split systems. Unit shall have a
multi-position design and shall be capable of hori-
zontal or vertical installation on a floor or in a ceil-
ing, with or without ductwork. (Only vertical units
are to be applied without ductwork.) Unit shall func-
tion as the indoor component of an air-to-air electric
heat pump system.
B. Unit shall be used in a refrigerant circuit
with a matching air-cooled condensing unit, section
15678, for matched system approved by
manufacturer.
1.02 QUALITY ASSURANCE
A. All coils shall be designed and tested in accordance
with ASHRAE 15 Safety Code for Mechanical
Refrigeration, latest edition.
B. Unit shall be constructed in accordance with ETL
and ETL, Canada, standards and shall carry the ETL
and ETL, Canada, labels.
C. Unit insulation and adhesive shall comply with
NFPA-90A requirements for flame spread and
smoke generation. Insulation shall contain an EPA-
registered immobilized antimicrobial agent to effec-
tively resist the growth of bacteria and fungi as
proven by tests in accordance with ASTM standards
G21 and 22.
D. Unit shall be manufactured in a facility registered to
the ISO 9002 manufacturing quality standard.
E. Direct-expansion coils shall be burst tested at
435 psi and leak tested at 150 psi.
1.03 DELIVERY AND STORAGE
Units shall be stored and handled per manufacturer’s
recommendations.
Part 2 — Products
2.01 EQUIPMENT
Indoor mounted, draw-thru, packaged air-handling
unit that can be used with or without ductwork in a
suspended horizontal configuration or free-standing
vertical configuration. Unit shall be indoor compo-
nent of a heat pump system. Unit shall consist of
forward-curved belt-driven centrifugal fan(s), motor
and drive assembly, prewired fan motor contactor,
factory-installed refrigerant metering devices, bypass
check valves, cooling coil, 2-in. disposable air filters,
and condensate drain pans for vertical or horizontal
configurations.
A. Base Unit:
1. Cabinet shall be constructed of mill-galvanized
steel.
2. Cabinet panels shall be fully insulated with
1
/
2
-in. fire-retardant material. Insulation shall
contain an EPA-registered immobilized antimi-
crobial agent to effectively resist the growth of
bacteria and fungi as proven by tests in accor-
dance with ASTM standards G21 and 22.
3. Unit shall contain PVC condensate drain pans
for both vertical and horizontal applications.
Drain pans shall have connections on right and
left sides of unit to facilitate field connection.
Drain pans shall have the ability to be sloped
toward the right or left side of the unit to pre-
vent standing water from accumulating in pans.
4. Unit shall have factory-supplied 2-in. throw-
away-type filters installed upstream from the
cooling coil. Filter access shall be from either
the right or left side of the unit.
B. Coils:
1. Coils shall consist of 3 rows (40RMQ008) or
4 rows (40RMQ012,016) of copper tubes with
sine-wave aluminum fins bonded to the tubes by
mechanical expansion. Coil tubing shall be
internally rifled to maximize heat transfer.
Refrigerant line connections shall be made on
the same side of the coil.
2. Coils shall feature factory-installed thermostatic
expansion valves (TXVs) for refrigerant con-
trol. The TXVs shall be capable of external
adjustment.
3. Coils shall have a factory-installed bypass line
and check valve assembly around the TXVs to
allow liquid flow from the coil to the outdoor
unit during Heating mode.
C. Operating Characteristics:
Unit shall be capable of providing
cfm air-
flow at an external static pressure of
in wg.
D. Motor:
Fan motor of the size and electrical characteristics
specified on the equipment schedule shall be factory
supplied and installed.
E. Factory-Installed Options:
1. Alternate Motor and Drive:
An alternate motor and medium- or high-static
drive shall be available to meet the airflow and
external static pressure requirements specified
on the equipment schedule.
2. External Paint:
Where conditions require, units shall be painted
with an American Sterling Gray finish.
Guide specifications — indoor units
