Manual 2100-614I
Page
10 of 43
outdoor temperature and humidity conditions are below
the setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 or WECOP Economizers (See Note A)
1
st
stage cooling setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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 setpoint 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.
6. 2-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)
1
st
stage cooling setpoint 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 setpoint of the
