York Millennium YCAJ150, Installation Operation & Maintenance, Page: 58 / 116

58 YORK INTERNATIONAL
FIG. 17 – 5 STEP LOADING/UNLOADING (RETURN WATER CONTROL)
FIG. 18 – 7 STEP LOADING/UNLOADING (RETURN WATER CONTROL)
LD02665
LD02664
NOTE:
The micro controls loading and unloading
on a 10 STEP scale regardless of the num-
ber of stages present. Therefore, loading
and unloading responses on 5 Step (stan-
dard) chillers may appear delayed (time
between stages increased) when miss-
ing steps are activated or deactivated by
the micro.
NOTES:
1. The “Lead Comp + 2 Steps, Lag Comp
Off” Step is skipped on a temperature
drop.
2. The micro controls loading and unload-
ing on a 10 STEP scale regardless of
the number of stages present. There-
fore, loading and unloading responses
on 7 Step (optional) chillers may ap-
pear delayed (time between stages in-
creased) when missing steps are acti-
vated or deactivated by the micro.
7 STEP (OPTIONAL)
5 STEP (STANDARD)
NOTE: Temperatures in pa-
rentheses are Celsius
equivalents.