Operating instructions

33
For units with a Touch Pilot display, two additional steps
must be completed to start the machine. On the master chiller,
the Master Control Type must be configured for the start con-
trol defined in the Machine Control configuration. To start the
machines, the master chiller must be started with the Start/Stop
button and Master Mode selected. The slave chiller must be
started with the CCN Mode selected.
Each application, Parallel and Series, are described sepa-
rately below.
DUAL CHILLER CONTROL FOR PARALLEL APPLI-
CATIONS — To configure the master chiller for parallel
applications using the Touch Pilot display, see Table 28. To
configure the master chiller for parallel applications using the
Navigator display, see Table 29.
To configure the slave chiller for parallel applications using
the Touch Pilot display, see Table 30. To configure the slave
chiller for parallel applications using the Navigator display, see
Table 31. A power cycle is required for the values to take
effect.
Compressor Loading Unloading (Staged circuit loading)
0
20
40
60
80
100
Load (%)
Compressor Capacity (%)
Lead Compressor Loading
Lag Compressor Loading
Lead Compressor Unloading
Lag Compressor Unloading
100
0
0
0
20
40
60
80
100
Load (%)
Lead Compressor Loading
Lag Compressor Loading
Lead Compressor Unloading
La
g
Com
p
ressor Unloadin
g
100
0 0
Lag compressor can fall anywhere in this area
when load between 40%~65%
Lead compressor can fall anywhere in this area
when load between 40%~65%
LOADING
UNLOADING
Compressor Capacity (%)
Equal Circuit Loading
Staged Circuit Loading
Fig. 21 — Compressor Loading and Unloading
a30-4466
a30-4477