Removal Of The C.h. Expansion Vessel; Removal Of The D.h.w. Expansion Vessel; Removal Of The Temperature-Pressure Gauge; Function - QHT RIVA FP Service Instructions Manual

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Third Part (edition-0106) Expansion Vessel and Temperature-Pressure Gauge
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Expansion Vessel and Temperature-
Pressure Gauge

1) Function

2) Checks

3) Removal of the C.h. Expansion Vessel

4) Removal of the Temperature-Pressure
Gauge
1 Function
The C.h. expansion vessel (A in Figure 1)
function is to allow for the volume expansion of
the c.h. circuit water due to the temperature rise.
2 Checks
1) Empty the primary circuit of the boiler.
2) Remove the protective cap C (Figure 2) from
the valve on the top of the c.h. expansion
vessel and connect a suitable air pressure
gauge.
3) Check the pre-load pressure. It would be 14.5
psi.
RIVA FP SERVICE MANUAL – REV A
Figure 1
3 Removal of the C.h. Expansion
Vessel
1) Remove the front panel of the case.
2) Completely unscrew the connection D and the
lock-nut E and remove the expansion vessel
A
from the top of the boiler (Figure 3).
D
3) Re-assemble the parts in reverse order of

removal.

4 Removal of the Temperature-
Pressure Gauge.
1) Remove the front and side panels of the case.
2) Empty the primary circuit.
3) Remove the fork F and remove the probe G
(Figure 4).
C
Figure 2
E
Figure 3
11-1