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Manual 2100-571A
Page 11 of 31
3. 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.
4. 2-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 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
1. 2-Stage Compressor Units No Economizer
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 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.