~
$J
Inoe. pU\pPrun1
t
YES
,
[ Go ill 4
~
Check hydraulic operation OK ?
1. Hydraulic diverter valve
moves left closes microswitch
M2 (VCWonly)
T
~
2. Differential valve opens.
T Pic14
[
Go to 5
4
I',
tiJVaillanl
HEATING, CONTROLS,HOTWATER.
~NO"
(a) Check 240v ACacross
pump terminals
T Pic10
(b) Check pump free to rotate
and not stuck
T Pic11
~.
I
tv
If(a) and (b) are OK.- change
pump.
I~NO
(a) Check appliance and
system full, pressurised and
vented of air.
(b) Check servo valve is in
C/htg position, return spring
holds carn down (VCW
only).
T
(c) Check for dirt, sludge,
flux or inhibitorcausTng
frothing in system
affecting:-
1. Pump performance
2. Hydraulic diverter valve
(VCW only)
3. Servo valve (VCW only)
4. Connecting tubes
5. Main heat exchanger
6. Differential valve
Pic 12
M3
OPEN
G
Rear view
I
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