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Table 21 — Compressor MUX Board Voltages
CONDENSER WATER FLOW — This is an optional
switch that can be used with the OMNIZONE™ controller. A
thermal dispersion flow switch detects water flowing past the
sensor element and closes normally open contacts that energize
a relay with normally open contacts to the unit controller. If no
flow switch is installed, a jumper must be in place to indicate
that there is water flow all the time in order for the economizer
and compressors to operate. A configuration decision is used to
indicate if a flow switch is installed and disable alarms from the
flow switch. When the flow switch is installed, the controller
will check for water flow when flow is requested for unit
operation. The controller will also test or to see if there is water
flow when the unit is not operating. If there is no flow when
the unit is operating or if there is flow when the unit is not
operating, the warning relay will energize and the yellow light
will be lit. If only loss of flow indication is desired, the
configuration for the flow switch may be set to no and the
controller will only energize the warning relay and turn on the
yellow light if there is a loss of flow while the unit is in
operation.
DIRTY FILTERS INPUT — This air pressure delta switch is
factory installed in the 50XJ unit. It receives 5 vdc from the
unit controller and monitors air pressure delta across the return
air filters. Switch is normally open, with manually adjustable
setting at the switch between 0.5 to 1.5 in. wg. Upon closure,
controller should wait to assure closure for minimum 1 minute,
and then indicate an alarm both via its Alarm Output and via
communications. However, all other unit operation should
remain normal.
A phase loss reversal switch may be installed in the unit to
detect over, under voltage conditions and phase loss or reversal.
Upon switch opening, the controller outputs will be forced to off
with safety forces, the alarm output will close and the red Alarm
light will be lit. A system alarm will be generated and displayed
on the unit keypad. Unit reset is automatic when the voltage and
power phases have been restored.
ECONOMIZER COIL FREEZE PROTECTION SWITCH —
This switch is installed in the 50XJ unit when the economizer
coil is provided. In the event the freeze protection switch
contacts open, the ventilation request output will be closed for
15 minutes and the Warning light will light. If the freeze
protection switch contacts are still open after 15 minutes, the
supply fan will be stopped, all compressor cooling will stop,
the economizer valve will open to 100%, the pump request
output will remain on, and the Alarm light will light. This will
maintain condenser water flow through the coil to prevent
freezing the coil while stopping all other operations that could
have contributed or will be affected by the freeze condition.
Unit reset is automatic when the contacts on the freeze
protection switch close again. The contacts on the freeze
protection switch open below 37 F.
SUPPLY FAN STATUS — Supply fan status is determined
by the duct static pressure sensor. If the fan is operating and a
fan speed signal is sent to the variable frequency drive, the duct
static pressure must become greater than the supply fan status
high set point (SETPT01) for the supply fan status software
point to turn on. When the duct static pressure becomes lower
than the supply fan status low set point, the supply fan status
will indicate OFF. If at any time the commanded state of the
supply fan does not agree with the supply fan status for more
than a minute, a supply fan status warning will be issued and
the warning light will be lit.
COMPRESSOR STATUS — Compressor status is determined
from the compressor MUX voltage input to the OMNIZONE
controller. If at any time the compressor status indicates off for
more than 30 seconds when the compressor commanded state
is on, the compressor will be turned off with a safety force and
the controller will try to start the compressor after five minutes.
If the compressor status does not indicate on for more than
30 seconds then the compressor will be turned off again with a
safety force for ten minutes. The controller will then try to
restart the compressor a second time. If the compressor status
does not come on within 30 seconds the compressor will be
turned off for 15-minutes this time. After the 15-minute delay
the controller will try to restart the compressor for a third time.
If the compressor does not start it will be locked out for this
operating cycle and will not be restarted until the OMNIZONE
controller goes through an off cycle where the cooling and
supply fan are shut down. When the compressor is going
through the three restarts or when it is locked out the Warning
light will be lit and the specific compressor alarm will be
indicated on the display and via communications. The three
strikes compressor test is reset automatically if the compressor
status comes on while the compressor is on.
COMP VOLTS RANGE
None 1.86 1.50 < V < .95
1 2.88 last val < = V < 2.95
2 3.59 last val < = V < 3.68
1,2 4.44 last val < = V < 4.55
3 5.13 last val < = V < 5.25
45.71
last val < = V < 5.85
and CMP4 is on
1,3 5.85 last val < = V < 5.99
1,4 6.39
last val < = V < 6.51
and CMP4 is on
2,3 6.36 last val < = V < 6.54
2,4 6.87
last val < = V < 7.03
and CMP4 is on
1,2,3 6.99 last val < = V < 7.15
1,2,4 7.46 last val < = V < 7.63
3,4 7.94 last val < = V < 8.11
1,3,4 8.45 last val < = V < 8.58
2,3,4 8.81 last val < = V < 8.99
1,2,3,4 9.26 V > 8.99