Condensate Overflow - Daikin MicroTech III Operation & Maintenance Manual

Condensate Overflow

Board LED Status – Condensate Overflow
Yellow
On
The MicroTech III unit controller's condensate sensor is
designed to detect excessively high condensate water
levels in the drain pan. When high condensate water level
is detected during cooling mode, the controller enters
into condensate overflow fault mode. The fan operates
normally during the condensate overflow fault mode.
Some faults and modes have higher priority than
condensate overflow fault mode. See "Priority of Faults
and Modes" on page 12 and Table 4 on page 12.
When the unit senses a condensate overflow fault while
in dehumidification or cooling mode the following occurs:
1 . The compressor de-energizes.
2 . When JP4 is open the (A) terminal will be de-
energized, when there is a fault. A to C will be used
to indicate an alarm signal.
When condensate levels return to normal, the controller
will automatically return to normal operation.
Remote Reset of Automatic Lockouts
The Remote Reset feature provides the means to
remotely reset some lockouts generated by high-
pressure and/or low-temperature faults. When the
MicroTech III unit controller is locked out due to one of
these faults, and the cause of the fault condition has
been cleared, energizing the O-terminal for 11 seconds
Table 3: Faults
Note: Faults will clear as defined in the table.
Fault Description
Low Voltage Brownout
Compressor High Pressure
Compressor Low Pressure
Compressor Low Suction Temperature
(Heating & Cooling Modes)
Compressor Low Suction Temperature
(Dehumidification Mode)
All Sensor Failures
Condensate Overflow
Low Entering Water Temperature
Serial EEPROM Corrupted
Invalid Jumper Configuration
1
Notes
Indicates auto recover is subject to intelligent alarm reset. Alarm auto recovers on the first two occurrences, locked out on the third occurrence within 24 hour
period. See "Intelligent Alarm Reset"
2. Cycling unit power will always reset any type of fault.
OM 931-6 • MicroTech III Unit Controller for WSHP
Green Red
Off Off
Auto Recovery
Yes
No
No
1
Yes
Yes
No
Yes
Yes
No
No
above for further details.
M
or more forces the MicroTech III unit controller to clear
the lockout. Cycling unit power also clears a lockout if
the conditions causing the fault have been alleviated.
Intelligent Alarm Reset
The Intelligent Reset feature helps to minimize nuisance
trips of automatic lockouts caused by low-temperature
faults. This feature clears faults the first two times they
occur within a 24-hour period and triggers an automatic
lockout on the 3rd fault. The retry count is reset to zero
every 24 hours. Refer to
Tenant Override
Note: It is recommended that the "Occupied Opera-
tion" on page 7 and "Unoccupied Operation
– Stand Alone Thermostat Control" on page
sections be reviewed prior to this section.
The MicroTech III unit controller enters tenant override
mode when the O terminal is energized for 4 to 10
seconds during a period when the Water Source Heat
Pump is in unoccupied mode.
Tenant override allows a tenant, returning to the
controlled space after the unit has been placed in
unoccupied mode, to activate the tenant override input
(O) and place the unit into occupied mode.
Any remote button or switch with momentary dry
contacts can be used for this purpose. During the 2-hour
tenant override period all the thermostat inputs will be
used (see "Occupied Operation" on page 7) for
unit operation. If the U terminal is still grounded after
the 2-hour time limit, the unit will return to unoccupied
mode. Refer to "Unoccupied Operation – Stand Alone
Thermostat Control" on page 9.
Tenant Override Button Reset
No
Yes
Yes
Yes
Yes
No
No
No
No
No
11
t III u C
ICro eCh nIt ontroller
"Table 3: Faults"
Network Reset
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
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