Manual 2100-614I
Page
12 of 43
3. 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 lead unit Y2 cooling output turns
on. If the outdoor temperature and humidity conditions
are below the setpoint of the economizer control the
lead unit economizer will continue to operate, and the
compressor will operate. If the compressor is already
operating on 1
st
stage cooling because outside free
cooling range no action occurs at 2
nd
cooling setpoint.
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 blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 3 LED will blink for 10-seconds before
going solid, at which time the lag unit Y1 cooling
output turns on. The lag unit economizer will operate
if the outdoor temperature and humidity conditions
are below the setpoint 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 setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for
4
th
Stage cooling the lag unit Y2 cooling output turns
on activating the lag unit compressor. If the outdoor
temperature and humidity conditions are below
the setpoint of the economizer control the lag unit
economizer will continue to operate. If the compressor
is already operating on 3
rd
stage cooling because
outside free cooling range no action occurs at 4
th
cooling setpoint.
4. 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 lead unit Y2 cooling output turns on,
at which time the lead unit compressor will operate on
compressor Stage 2 full capacity. If the compressor is
already operating on Stage 1 partial capacity because
outside free cooling range the compressor will switch to
compressor Stage 2 full capacity.
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 blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 3 LED will blink for 10-seconds before
going solid. The lag unit economizer will operate if the
outdoor temperature and humidity conditions are below
the setpoint of the economizer control. If outdoor
conditions are not acceptable for free cooling the
compressor will automatically operate on compressor
Stage 1 partial capacity instead of the economizer.
4
th
cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for 4
th
Stage cooling the lag unit Y2 cooling output turns on,
at which time the lag unit compressor will operate on
compressor Stage 2 full capacity. If the compressor is
already operating on Stage 1 partial capacity because
outside free cooling range the compressor will switch to
compressor Stage 2 full capacity.
5. 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
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 lead unit Y2 cooling output turns
on. If the outdoor temperature and humidity conditions
are below the setpoint of the economizer control the
lead unit economizer will continue to operate, and the
compressor will operate on compressor Stage 1 partial
capacity. If the compressor is already operating on
Stage 1 partial capacity because outside free cooling
