Manual 2100-614C
Page 11 of 40
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate on compressor Stage 1 partial
capacity instead of the economizer.
2
nd
cooling set point is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2
nd
Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the lag unit Y1 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the set point of the economizer control the lag
unit economizer will operate instead of the compressor.
If outdoor conditions are not acceptable for free
cooling the compressor will automatically operate on
compressor Stage 1 partial capacity instead of the
economizer.
3
rd
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3
rd
Stage cooling the lead unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate on compressor Stage
1 partial capacity. If outdoor conditions are not
acceptable for free cooling the lead unit compressor
will automatically be operating on compressor Stage
1 partial capacity and will go to Stage 2 full capacity
operation.
4
th
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for 4
th
Stage cooling the lag unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate on compressor Stage
1 partial capacity. If outdoor conditions are not
acceptable for free cooling the lag unit compressor
will automatically be operating on compressor Stage
1 partial capacity and will go to Stage 2 full capacity
operation.
COOLING OPERATING SEQUENCES
FOR NON-ALTERNATING LEAD/LEAD/
LAG/LAG CONFIGURATION
Note: Heat pumps cannot be operated in Non-
Alternating Lead/Lead/Lag/Lag sequence. Selecting
Heat Pump = Yes will override a Non-Alternating
selection and force system to Alternating Lead/Lag/
Lead/Lag sequence.
1. 2-Stage Compressor Units No Economizer
1
st
stage1
st
stage cooling set point is the setting
(SP) input into the controller. Factory default is 77F
(25C). On a call for cooling the blower of the lead
unit will come on immediately (if not already on – See
Blower Operation), and the Stage 1 LED will blink for
10-seconds before going solid, at which time the lead
unit compressor will start in compressor Stage 1 partial
capacity operation.
2
nd
cooling set point is 4F (default setting, user
selectable 2-6F) warmer than Stage 1, at which time
the lead unit compressor will switch to compressor
Stage 2 full capacity.
3
rd
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3
rd
Stage cooling the blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and Stage 3 LED will blink for 10-seconds before going
solid, and then the lag unit compressor will start in
compressor Stage 1 partial capacity.
4
th
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for
4th Stage cooling the Stage 4 LED comes on solid
(no delay), and the lag unit compressor will switch to
compressor Stage 2 full capacity operation.
2. 1-Stage Compressor Units with Older EIFM
Economizers
1
st
stage cooling set point is the setting (SP) input into
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the set point of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.
2
nd
cooling set point is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2
nd
Stage cooling the lead unit Y2 cooling output turns on.
The lead unit economizer will close and the compressor
will operate. If the compressor is already running from
1
st
stage cooling call due to outdoor conditions being
outside of free cooling range no action occurs at 2
nd
stage set point.
3
rd
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3
rd
Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
3 LED will blink for 10-seconds before going solid,
and the lag unit economizer will operate if the outdoor
temperature and humidity conditions are below the set
point of the economizer control. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.
4
th
cooling set point is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for 4th
Stage cooling the lag unit economizer will close and the
compressor will operate. If the compressor is already
running from 3
rd
stage cooling call due to outdoor
conditions being outside of free cooling range no action
occurs at 2
nd
stage set point.
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