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Manual 2100-563C
Page 10 of 40
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.
3. 1-Stage Compressor Units with Older EIFM
Economizers (Enthalpy OD Sensor)
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 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 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 close and the
compressor will operate.
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.
4. 1-Stage Compressor Units with Newer
ECONWMT Economizers (See Note A)
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
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 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.
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 continue to operate
as long as outdoor conditions are acceptable, and the
compressor will operate.
5. 2-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 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 close and the compressor
will operate on full capacity compressor Stage 2.
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 on full capacity compressor Stage 2.