Daikin MicroTech III Operation & Maintenance Manual

OM 931-6 • MicroTech III Unit Controller for WSHP 11 www.DaikinApplied.com
Condensate Overow
Board LED Status – Condensate Overow
Yellow Green Red
On Off Off
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 overow fault mode. The fan operates
normally during the condensate overow fault mode.
Some faults and modes have higher priority than
condensate overow fault mode. See "Priority of Faults
and Modes" on page 12 and Table 4 on page 12.
When the unit senses a condensate overow fault while
in dehumidication 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
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 rst 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 "Table 3: Faults"
Tenant Override
Note: It is recommended that the "Occupied Opera-
tion" on page 7 and "Unoccupied Operation
– Stand Alone Thermostat Control" on page 9
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.
MICroteCh III unIt Controller
Table 3: Faults
Note: Faults will clear as dened in the table.
Fault Description Auto Recovery Tenant Override Button Reset Network Reset
Low Voltage Brownout Yes No Yes
Compressor High Pressure No Yes Yes
Compressor Low Pressure No Yes Yes
Compressor Low Suction Temperature
(Heating & Cooling Modes)
Yes
1
Yes Yes
Compressor Low Suction Temperature
(Dehumidication Mode)
Yes Yes Yes
All Sensor Failures No No Yes
Condensate Overow Yes No Yes
Low Entering Water Temperature Yes No No
Serial EEPROM Corrupted No No No
Invalid Jumper Conguration No No No
Notes
1
Indicates auto recover is subject to intelligent alarm reset. Alarm auto recovers on the rst two occurrences, locked out on the third occurrence within 24 hour
period. See "Intelligent Alarm Reset" above for further details.
2. Cycling unit power will always reset any type of fault.

Daikin MicroTech III Specifications

General

Brand	Daikin
Model	MicroTech III
Category	Controller
Language	English