Failures; Hydraulic, Electric And Refrigeration; Systems; Hydraulic System - Fujitsu WATERSTAGE WS A050DD6 Series Maintenance Document

Split system single phase type
3

Failures

3.1 Hydraulic, Electric and Refrigeration Systems

3.1.1 Hydraulic System

If the installation is fitted with a heating floor, the most
common failures are those listed below:
FAILURE CASES
1- Clogged filter*
or sludge in system
2- Pump out of order
3-Leak
4- Clogged heating
circuit (crushed pipe)
5- Misbalance
6- Floor undersized or
charge losses too high
* Not required and not shown on the device.
Maintenance Document 1589-3
CONSEQUENCES
Flow pressure too high
∆T too high (>7)
Zero flow pressure
current too high (rotor locked)
zero current (winding cut off)
pump stuck
Low level in expansion vessel
Very high difference between floor
flow/return temp
Very high difference between floor
flow/return temp
Very high difference between floor
flow/return temp
SOLUTIONS
clean filter or desludge
clean filter or desludge
change pump if faulty
change pump if faulty
change pump if faulty
Unplug pump for 5s
On collector,
Pipe leak. Pipe is
isolate heating
faulty
circuits to
Leak in heating
determine which
circuit. Floor
heating circuit is
again.
perforated.
On collector,
check heating
Clear with test
circuit flow/return
pump
temps (infrared
thermometer)
If no clogged
Call the installer's
heating circuit,
or floor coverer's
check for
responsibility into
crushing with
question
infrared camera
Rebalance
On collector,
check heating Call the installer's
circuit flow/return responsibility into
temps (infrared question
thermometer)
APPLIED
BY
Installer
Installer
Service
station
Service
station
Service
station
Installer
Service
station
Installer
Service
station
Installer
Installer
or
Service
station
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