MBVC Installation Manual
2
HIGHVOL TAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SER V ICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESEN T
.F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJU R Y
OR
DEATH
.
WARNING
ONLY
INDIVIDUALS
MEET IN G
THE
REQ UIR EM EN TS
OF
AN
“E
NTRY
L
EVEL
T
ECH N ICIA N
”,
Y
USE
THIS
INFOR M ATIO N
.A
TTEMPTING
TO
INSTA LL
OR
REPAIR
THIS
UNIT
WITHOUT
SUCH
BACKGROUN D
MAY
RESULT
IN
PRODUCT
DAMAGE
,
PERSONAL
INJU R Y
,
OR
DEATH
.
AT
A
MINIMUM
,
AS
SP ECIF IED
BY
THE
A
IR
C
ONDITIONING
,H
EATIN G
AND
R
EFRIG ERAT ION
I
NSTITUTE
(AHRI)
MA
WARNING
CARBON MONOXIDE POISONING HAZARD
-
Special Warning for Installation of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Utility Rooms or Parking Areas
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unventilated garages, utility rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulting from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, utility room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
ventilation.
This ventilation is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device continues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain damage or death.
B10259-216
G
ENERAL
I
NFORMATION
The MBVC Blower Cabinets are used in combination with a
cased evaporator coil. This combination of blower and coil
functions as the indoor part of a split air-conditioning system,
and may be matched with a remote condensing or heat pump
unit. The blower cabinet can also function as an electric fur-
nace when used with an electric heater.
NOTE: The electric heating elements for electric furnace
installation are not shipped with the cabinet and are field-
installed.
Systems should be properly sized by heat gain and loss cal-
culations made according to methods of the Air Conditioning
Contractors Association (ACCA) or equivalent. It is the
contractor’s responsibility to ensure the system has adequate
capacity to heat or cool the conditioned space.
FEATURES
This modular blower is a part of the ComfortNet™ family of
products. It may be installed as part of a “legacy” system
using a standard 24 VAC thermostat. However, with a CTK0*
ComfortNet™ thermostat kit, this modular blower may be in-
stalled as part of a digitally communicating system. The
ComfortNet™ system provides automatic airflow configura-
tion, enhanced setup features, and enhanced diagnostics. It
also reduces the number of thermostat wires to a maximum
of four.
CLEARANCES AND ACCESSIBILITY
The unit can be positioned for upflow, counterflow, horizontal
right or horizontal left operation. Zero clearance is allowed
on all sides for combustible materials. Thirty-six inches should
be allotted on the door side for maintenance and service.
To reduce risk of rusting, do not install the unit directly on the
ground or on a floor that is likely to be wet. In such environ-
ments, the unit must be elevated by use of a sturdy, nonpo-
rous material.
INSULATION
To ensure efficient operation, review the following precau-
tions.
• If the unit is located in an area with high ambient
temperature and/or high humidity, the air handler may
be subject to nuisance sweating of the casing. On
these installations, a wrap of 2” fiberglass insulation
with a vapor barrier is recommended.
• The factory recommends insulating the duct running
through any unconditioned spaces.
To reduce operating sound and vibration transmission use
flexible canvas duct connections at the cabinet.
I
NSTALLATION
I
NSTRUCTIONS
BLOWER WITH CASED EVAPORATOR COIL INSTALLATION
TOP CABINET
BOTTOM CABINET
Figure 1 - Coil and Blower Connection