Hydraulic, Electric And Refrigeration Systems; Hydraulic System - Fujitsu Waterstage Comfort 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 CONSEQUENCES
Flow pressure too high
1- Clogged filter*
or sludge in system
∆T too high (>7)
Zero flow pressure
current too high (rotor
locked)
2- Pump out of order
zero current (winding
cut off)
pump stuck
Low level in expansion
3-Leak
vessel
Very high difference
between floor flow/return
temp
4- Clogged heating circuit
(crushed pipe)
Very high difference
5- Misbalance between floor flow/return
temp
Very high difference
6- Floor undersized or
between floor flow/return
charge losses too high
temp
Not required and not shown on the device
*
Maintenance document "1792 - EN"
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, isolate
Pipe leak Pipe is faulty
heating circuits to
determine which heating
Leak in heating circuit Floor
circuit is perforated
again
On collector, check
heating circuit flow/
Clear with test pump
return temps (infrared
thermometer)
If no clogged heating Call the installer's or floor
circuit, check for crushing coverer's responsibility into
with infrared camera question
Rebalance
On collector, check
heating circuit flow/ Call the installer's responsibility
return temps (infrared into question
thermometer)
APPLIED BY
Installer
Installer
Service station
Service station
Service station
Installer
Service station
Installer
Service station
Installer
Installer or
Service station
- 39 -