Yazaki CH-K50 - Control Adjustments

6
Unit Size
THRP Settings (amps)
208v
230v
K30
3.0
2.8
K40
4.5
4.0
K50
4.5
4.0
K60
6.0
5.5
K80
6.0
5.5
K100
6.0
5.5
Figure 6 – SOLUTION PUMP THERMAL OVERLOAD
CONTROL ADJUSTMENTS
The leaving chilled water temperature is
controlled to a standard rating point of
44.6°F (7°C). The operating dead band of
Low Fire is 3.6°F (2°C). The Low Fire dead
band is not adjustable. The operating dead
band of High fire is 7.2°F (4°C). The High
Fire dead band can be cut in half by setting
Dip Switch 2 on the I/O Board to ON. The
leaving chilled water temperature can be
adjusted using the TC potentiometer on the
CPU Board. The leaving chilled water set
point can be set in a range of 40.1°F (4.5°C)
to 59.9°F (15.5°C).
Similarly, the leaving hot water standard
rating point is 131°F (55°C). The Low Fire
dead band and High Fire dead bands are
identical to Cool mode, but the High Fire
dead band can be cut in half by setting Dip
Switch 4 on the I/O Board to ON. The
leaving hot water temperature can be
adjusted using the TH potentiometer on the
CPU Board. The leaving hot water set point
can be set in a range of 122.9°F (50.5°C) to
140.9°F (60.5°C).
Figure 7 – TEMPERATURE CONTROL ADJUSTMENTS