3
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 furnace 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 calcula-
tions made according to methods of the Air Conditioning Contrac-
tors Association (ACCA) or equivalent. It is the contractor’s re-
sponsibility to ensure the system has adequate capacity to heat or
cool the conditioned space.
F
EATURES
This modular blower is a part of the ComfortNet™ family of prod-
ucts. It may be installed as part of a “legacy” system using a stan-
dard 24 VAC thermostat or, with a ComfortNet™ thermostat kit,
as part of a digitally communicating system. The ComfortNet™
system simplifies wiring, provides enhanced setup features and
elevates diagnostics capabilities.
A
CHIEVING
L
ESS
A
IR
L
EAKAGE
:
Ensure all the gaskets remain intact on surfaces as shipped with
the unit. Ensure upon installation that the plastic breaker cover is
flush on with the access panel and access panel is flush with the
cabinet. With these requirements satisfied, the unit achieves less
airflow leakage when tested in accordance with ASHRE Standard
193.
•
Cabinet air leakage less than 2.0% at 1.0 inch H
2
O
when tested in accordance with ASHRAE standard 193.
•
Cabinet air leakage less than 1.4% at 0.5 inch H
2
O
when tested in accordance with ASHRAE standard 193.
C
LEARANCES
A
ND
A
CCESSIBILITY
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 environments,
the unit must be elevated by use of a sturdy, nonporous material.
I
NSULATION
To ensure efficient operation, review the following precautions.
•
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
B
LOWER
WITH
C
ASED
E
VAPORATOR
C
OIL
I
NSTALLATION
Secure the coil and blower together with the two connector plates
and screws supplied in the blower bag assembly. Use one connec-
tor plate and six screws on each side of the unit.
If accessory electric heat is to be added, install now per the in-
structions shipped with the heater kit.
Air Flow
Figure 1 - Coil and Blower Connection
Figure 2 - Upflow Application
U
PFLOW
I
NSTALLATION
For upflow installations, the blower cabinet must sit on top of the
coil cabinet (Figure 2).
NOTE:
All panels should be in place before installing the cabinet.
1. Place the blower and coil cabinet assembly upright on the
return duct or duct opening. Ensure that there is ample
support for the cabinet assembly and all attached ductwork.
2. Connect refrigerant and condensate drain connections per
the evaporator coil installation instructions. Ensure
refrigerant and drain lines do not interfere with service
access to the unit.
3. Attach supply ductwork. Seal connections between unit and
ductwork as required to reduce/eliminate air leakage.
4. Make electrical connections as specified in
Electrical
Connections
section of this manual.
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