10
CONTROL ADJUSTMENTS
The leaving chilled water and hot
water temperature controls are set at the
factory to the Standard Specifications Set
Points, which are a cooling set point of
44.6°F
(7°C)
and a heating set point of
140.0°F
(60°C)
. A Yazaki Authorized
Service Provider can adjust these set
points using the ACT5 Maintenance
Checker. The cooling set point is
adjustable from 41°F
(5°C)
to 53.6°F
(12°C)
. The heating set point is
adjustable from 104.0°F
(40°C)
to 145.4°F
(63°C)
.
The CH-MG Series has an Economy
Mode feature as well that can be
controlled by the Building Management
System. Economy Mode functions in
much the same way as night set-back.
When engaged, the cooling set point will
rise by 5.4°F
(3°C)
and the heating set
point will fall by 9°F
(5°C)
. Dis-engaging
the Economy Mode will immediately
restore the cooling and heating set points
back to their original values.
Fig. 7
– ACT5 Maintenance Checker
Adjusting the chilled and hot water set
points can only be done using the ACT5.
Using a standard CAT5 cable
(one was
provided from the factory)
, connect the
ACT5 to the Main CPU Board located in
the upper right of the control box. There
is a jack in the upper middle of the CPU
Board
(See Figure 8)
that is for use with the
ACT5.
There is also an identical jack on the
Sub-Control Board located in the top left
corner of the control box. This board’s
jack is not functional and should not be
used.
To adjust the chilled and hot water set
points:
1.
On the ACT5, use the
“Λ” and “V”
buttons to move the cursor to the line
“2. Unit data set” and press “ENTER”.
2.
Then use the “Λ” and “V” buttons to
move the cursor to the line
“B2 CB
Set” and press “ENTER”.
3.
Use the
“◄” and “►” buttons to reach
the menu displaying data points 13-16.
4.
Use the “Λ”, “V”, “<”, and “>” buttons to
move the cursor to temperature
numbers of data point 14 to change
the cooling set point, or data point 15
to change the heating set point.
5.
Once highlighting the block to be
changed, use the “+” and “-“ buttons to
scroll through the available values until
the desired value is displayed.
6.
Press “ENTER” to save the new
setting.
7.
Press and hold the “◄” for longer than
one full second to back out of the
menu, or simply unplug the ACT5 if it
is no longer needed for other
functions.
