www.DaikinApplied.com 45 IOM 1274-3 • CENTRIFUGAL WATER CHILLERS
Figure 49: Cooling Tower Information
NOTE: Selection and setup of cooling tower control methods
is in the Settings icon, Tower tab, see Table 16 on
page 50.
SET Screens
The Setpoint Screens on the Human Machine Interface
(HMI) are used to input the various setpoints associated with
equipment of this type. (Note that if the HMI is unavailable,
setpoints can be changed by connecting a laptop or by remote
access.) Appropriate setpoints are factory set and checked by
a Daikin Applied service representative during commissioning;
however, adjustments and changes are often required to meet
job conditions. Certain settings involving pumps and tower
Pressing the Settings icon found at the bottom of every screen
accesses the last Setpoint tab used. There are nine setpoint
tabs accessible across the top of the Settings screen:
1. WATER, sets leaving water temperature setpoint, start
and stop delta-T, resets, etc.
2. MODES, selects various unit parameters such as liquid
injection, timers, pump staging, control source, unit
mode, etc.
3. MOTOR, selects power related setpoints such as amp
limits.
4. TOWER, selects the method of controlling the cooling
tower and sets the parameters for fan staging/VFD.
5. ALARMS, sets the limit and shutdown alarms.
6. TIMERS, sets the amount of time the evaporator pump
must run before a compressor can start.
7. INTERFACE, sets the network protocol and associated
options.
A typical Setpoint Screen is displayed in Figure 50. A list of
setpoints along with their default value, available setting range,
and password authority can be found in the tables after each
Setpoint Screen, starting on page 47. The WATER button,
for example, contains various setpoints relating to water
temperature setpoints.
In Figure 52 and in the rest of the Setpoint tables on the
following pages, the letters in the Password column refer to the
following:
• M = Manager Level (The password number will be
supplied by Daikin Applied service at startup.)
• O = Operator Level (The password number for
operator level is 100.)
• T = Technician Level (The password number for
technician level is only provided to Daikin Applied
technicians.)
To Next Page
Loading...
