MBVC Installation Manual
4
Rods
Support
A
ccess
Panel
Figure 5 - Hanging Installation
2. If installed above a finished ceiling or living space, be
sure to put a secondary drain pan under the entire unit,
and pipe the drain separately from the main condensate
drain.
3. Connect refrigerant and condensate drain connections
per the coil section installation instructions. Ensure
refrigerant and drain lines do not interfere with service
access to the unit.
4. Attach return and supply ductwork. Seal connections.
5. Make electrical connections as specified in Electrical
Connections section of this manual.
COUNTERFLOW AND HORIZONTAL APPLICATIONS
Loosen motor mount and rotate motor (See Figure 6). Be
sure motor is oriented with the female connections on the
casing pointing down. If the motor is not oriented with the
connections pointing down, water could collect in the motor
and cause premature failure.
NOTE: After rotating motor, tighten motor mount to secure
motor. Be sure that the gap between the motor and the
insulation is the same as it was before loosening the motor
mount. This will ensure that the blower wheel is properly
spaced inside the blower housing.
FEMALE CONNECTIONS
SIDE VIEW
W
A
RNING
SOFTW
A
RE VER.
TOP
FRONT VIEW
Figure 6- MBVC Motor Orientation
E
LECTRICAL
C
ONNECTIONS
Consult the local power company and local codes before in-
stalling this unit. All wiring must be in accordance with the
National Electrical Code as well as all local codes. Knock-
outs have been provided on side and top of the cabinet for
the installation of the electrical conduit. If the knockouts on
the cabinet sides are used for electrical conduit, an adapter
ring must be used in order to meet UL1995 safety require-
ments. Use Minimum Circuit Ampacity and type of wire to
determine proper wire size. The unit MUST be properly
grounded. A ground lug is provided in the unit.
Check all factory connections before connecting electrical
power to unit to ensure none were loosened or disconnected
during shipping and handling.
HIGHVOL TAGE!
T
O
PREVEN T
PERSONAL
INJU R Y
OR
DEATH
DUE
TO
ELECT R ICAL
SHOCK
,
DISCONNECT
THE
ELECT R ICAL
POWER
BEFORE
ELECTR ICALLY
CONNECTING
THE
UNIT
.
WARNING
T
O
AVOID
THE
RISK
OF
FIRE
OR
EQU IP MEN T
DAMAGE
,
USE
COPPER
CONDUCTORS
.
WARNING
T
O
AVOID
THE
RISK
OF
PERSONAL
INJU R Y
,
WIRING
TO
THE
UNIT
MUST
BE
PROPERLY
POLA RIZED
AND
GROUND ED
.
CAUTION
A
LL
WIRING
MUST
COM PLY
WITH
APPLICABLE
LOCAL
AND
NATIONAL
CODE S
.T
YPE
AND
LOCAT ION
OF
FUS E D
DISCONNECT
SWITCH
(
ES
)
MUST
COM PLY
WITH
ALL
APPLICABLE
CODE S
AND
PROVIDE
OVERCU R RENT
PROTECTION
AS
SHOWN
ON
THE
NAMEPLATE
.
WARNING
208/230 VOLT LINE CONNECTIONS
If heater kits will not be installed, remove the proper size
knockout for the electrical conduit connection. Connect elec-
trical conduit to the unit using two washers to make an ap-
proved connection.
The power supply wires must be connected to the red and
black power wiring. Two wire nuts are provided in the bag
assembly for this connection. Wrap the wire nuts with elec-
trical tape. (Insulated crimp type connectors, field supplied,
may be substituted for the wire nuts and electrical tape pro-
vided proper size connectors are used.) A ground wire MUST
be connected to the ground lug inside the unit.
LOW VOLTAGE WIRING
Low voltage wiring connections are made at the top of the
cabinet. See the 24 Volt Thermostat Wiring section of this
manual for typical low voltage wiring connections. A mini-
mum 18 AWG wire must be used for installations up to 50
feet and 16 AWG wire for installations over 50 feet.
OPERATION ON 208 VOLT SUPPLY
The unit transformer is factory connected for 230 V opera-
tion. If unit is to operate on 208 V, disconnect the red wire
from terminal 3 of the unit transformer and connect them to
terminal 2 of the unit transformer.