Troubleshooting - Myson WHISPA III 5000 RCU Manuel D'installation, D'utilisation Et D'entretien

33359 Whispa RCU (US) Manual+FR.qxp 15/04/2019 11:00 Page 11
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10 WHISPA III 5000, 9000 & 12000 RCU

10.0 Troubleshooting

Once installed, this fan convector becomes an integral part of
the heating system that will also include boiler, pump, other
emitters such as radiators and fan convectors, and a number of
heating controls depending on system complexity. An apparent
Problem
Heating Mode -
No Fan
Heating Mode
poor heating
performance and/or
unit cycles on
low limit thermostat
If the fan convector is still faulty after checking the above, call your installer or MYSON.
Common Installation Faults
For optimum performance, this unit must be correctly sized to
match the heat loss requirements of the space it is required to
Problem
Poor heating
performance
Poor heating
performance
(unit may cycle on
low limit thermostat)
Other Faults
Problem
No flow through unit,
and fan not operating
Possible Causes
Room thermostat not calling for heat
Unit not switched on at breaker panel
Breaker tripped at panel
Water temperature reaching unit
below 110°F
Low water temperature to unit
Poor water flow
Unit incorrectly sized for heat loss of room
Boiler thermostat set too low
Lack of flow to fan convector -
Isolating valves not fully open
System incorrectly balanced with unit starved of hot water flow
Possible Causes
Solenoid valve not energised
Solenoid valve not opening
problem with this unit may be the result of system controls being
incorrectly set, and can be solved easily without calling out your
installer or MYSON. Before calling out your installer or MYSON,
please carry out the checklist below.
Turn up room thermostat
Check all wiring, reset breaker
Boiler ON and set to high
Circulating pump running
Note: Operation of fan convector can be checked by
switching to summer setting
Turn up boiler thermostat
Vent air from heating system
heat, and the heating system must be correctly designed to
provide adequate flow of hot water to the unit (see section 2). If
the recommendations in section 2 are not followed problems
may arise as detailed below.
Possible Causes
Pump set on low setting
Pipe sizing to unit too small
Check room thermostat set correctly and
Check transformer output 24V
Check 24V actuator
EN
Remedy
Switch on breaker
Check boiler -
Programmer ON
Remedy
functioning