5
E
LECTRICAL
C
ONNECTIONS
Consult the local power company and local codes before install-
ing this unit. All wiring must be in accordance with the National
Electrical Code as well as all local codes. Knockouts 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 requirements. Use Minimum Circuit Ampac-
ity 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 ship-
ping and handling.
208/230 V
OLT
L
INE
C
ONNECTIONS
If heater kits will not be installed, remove the proper size knock-
out for the electrical conduit connection. Connect electrical con-
duit to the unit using two washers to make an approved connec-
tion. If the high voltage knockout is removed, please use the pro-
vided foam tape to seal the opening with the conduit.
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 electrical tape. (In-
sulated crimp type connectors, field supplied, may be substituted
for the wire nuts and electrical tape provided proper size connec-
tors are used.) A ground wire MUST be connected to the ground
lug inside the unit.
L
OW
V
OLTAGE
W
IRING
A 24V-control voltage connects the air handler to the room ther-
mostat and condenser and must use low voltage wiring with cop-
per conductors. A minimum 18 AWG wire must be used for in-
stallations up to 150 feet. Low voltage wiring must be connected
through the top of the cabinet or either side. See the “Thermo-
stat Wiring” section of this manual for typical low voltage wiring
connections. If the low voltage opening is being used, please re-
place the pre-installed cap with the bushing provided in the lit-
erature kit.
HIGH VOLTAGE!
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
THE
ELECTRICAL
POWER
BEFORE
ELECTRICALLY
CONNECTING
THE
UNIT
.
WARNING
T
O
AVOID
THE
RISK
OF
FIRE
OR
EQUIPMENT
DAMAGE
,
USE
COPPER
CONDUCTORS
.
WARNING
T
O
AVOID
THE
RISK
OF
PERSONAL
INJURY
,
WIRING
TO
THE
UNIT
MUST
BE
PROPERLY
POLARIZED
AND
GROUNDED
.
CAUTION
A
LL
WIRING
MUST
COMPLY
WITH
APPLICABLE
LOCAL
AND
NATIONAL
CODES
. T
YPE
AND
LOCATION
OF
FUSED
DISCONNECT
SWITCH
(
ES
)
MUST
COMPLY
WITH
ALL
APPLICABLE
CODES
AND
PROVIDE
OVERCURRENT
PROTECTION
AS
SHOWN
ON
THE
NAMEPLATE
.
WARNING
O
PERATION
ON
208 V
OLT
S
UPPLY
The unit transformer is factory connected for 230 V operation. 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.
24 V
OLT
“L
EGACY
” T
HERMOSTAT
W
IRING
NOTE:
Wire routing must not interfere with the circulator blower
operation or routine maintenance.
The optional usage of a dehumidistat allows the modular blower’s
circulator blower to operate at a slightly lower speed during a com-
bined thermostat call for cooling and dehumidistat call for dehu-
midification. This lower blower speed enhances dehumidification
of the conditioned air as it passes through the AC coil. For proper
function, a dehumidistat applied to this modular blower must op-
erate on 24 VAC and utilize a switch which
opens on humidity rise.
To install/connect a dehumidistat:
1. Turn OFF power to modular blower
2. Secure the dehumidistat neutral wire (typically the white
lead) to the screw terminal marked “DEHUM” on the
modular blower’s integrated control module.
3. Secure the dehumidistat hot wire (typically the black lead)
to the screw terminal marked “R” on the modular blower’s
integrated control module.
4. Secure the dehumidistat ground wire (typically the green
lead) to the ground screw on the modular blower.
NOTE:
Ground wire may not be present on all dehumidistats.
5. Turn ON power to modular blower.
To enable the dehumidification function, move the dehumidifica-
tion dipswitch S7 from OFF to ON.
To enable the dehumidification function, move the dehumidifica-
tion dipswitch S7 from OFF to ON.
ON
OFF
Move to the
ON position
to enable
dehumidification
S5 S6 S7 S8
Figure 7 - DipSwitches
Содержание MBVC 1600
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