Specifications

17
ELECTRICAL
Figure 15 – Junction Box
Each absorption chiller/chiller-heater is
factory-wired for the specific voltage listed on
the Unit Nameplate. The standard field
wiring connections are provided in the
junction box located on the left side of the
unit on all models except for the WFC-SC50
model which has the junction box located at
the back.
Optional field wiring connections for
accessories and alarms are provided in the
junction box as well as in the control box.
All absorption chillers/chiller-heaters must
be electrically grounded and field wiring
installed in accordance with the National
Electrical Code (NFPA 70, latest edition).
HIGH VOLTAGE CONNECTIONS
The high voltage wiring should connect to
L1, L2, L3, and G in the left section of the
junction box, shown in Figure 15.
Check the voltage of each leg to ground.
Whichever leg has the greatest deviation
from the other two legs (the high leg or “wild”
leg) should be terminated on L2.
Use of phase-monitors to protect the
motor of the solution pump is recommended
in areas where power supply voltage is
known to be unstable.
Phase rotation should be checked at
these terminations as well. A phase rotation
meter is recommended to be used since the
amp draw of the solution pump is so low that
it is difficult to use that to determine proper
loading of the pump motor. While almost
any brand of phase rotation meter will do, the
Hioki 3126 is suggested.
Figure 16 – Hioki 3126 Rotation Meter
The proper rotation by rotation meter is
Clockwise. If the rotation detected is
incorrect, reverse the rotation by turning off
power to the unit, swapping the wires
terminating at L1 and L3, turning power back
onto the unit, and verifying proper rotation.