17
CAUTION!
Use only copper conductors for field
installed electrical wiring. Unit terminals are not
designed to accept other types of conductors.
Electrical - Line Voltage
All field installed wiring, including electrical ground, must
comply with the National Electrical Code as well as all
applicable local codes. Refer to the unit electrical data for
fuse sizes. Consult wiring diagram for field connections
that must be made by the installing (or electrical)
contractor.All final electrical connections must be made
with a length of flexible conduit to minimize vibration and
sound transmission to the building.
General Line Voltage Wiring
Be sure the available power is the same voltage and
phase shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electric Code, whichever is applicable.
Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to the “L” side of the contactor
as shown in Figure 16. Consult Table for correct fuse size.
ELECTRICAL - POWER WIRING
Figure 16: Series Single Phase Line Voltage
Field Wiring. Three phase wiring is similar
except that all three power wires are directly
connected to the contactor.
Transformer
CXM
Control
Contactor -CC
BR
Low
Voltage
Connector
CB
L2
L1
Unit Power Supply
See electrical table for
breaker size
Grnd
Rev.: 5/17/01 B
Capacitor
WARNING!
Disconnect electrical power
source to prevent injury or death from
electrical shock.
208 Volt Operation
All commercial 08-0 Volt units are factory wired for
08 Volt operation. The transformer may be switched
to the 0V tap as illustrated on the wiring diagram by
switching the red (08V) and the orange (0V) wires at
the contactor terminal.
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WARNING!
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CAUTION!
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Blower Speed Selection –
PSC (Permanent Split Capacitor) blower fan speed can
be changed by moving the blue wire on the fan motor
terminal block to the desired speed as shown in Figure
17. Most units are shipped on the medium speed tap.
Consult submittal data or engineering design guide for
specific unit airflow tables. Typical unit design delivers
rated airflow at nominal static (0.15 in. w.g. [7Pa])
on medium speed and rated airflow at a higher static
(0.4 to 0.5 in. w.g. [100 to 15 Pa]) on high speed for
applications where higher static is required. Low speed
will deliver approximately 85% of rated airflow at 0.10 in.
w.g. [5 Pa]. An optional high static blower is available on
some models.
Special Note for ARI Testing:
To achieve rated
airflow for ARI testing purposes on all PSC products,
it is necessary to change the fan speed to “HI” speed.
When the heat pump has experienced less than 100
operational hours and the coil has not had sufficient time
to be “seasoned”, it is necessary to clean the coil with a
mild surfactant such as Calgon to remove the oils left by
manufacturing processes and enable the condensate to
properly “sheet” off of the coil.
