Function; Checks; Control P.c.b. 11.62; Selection And Adjustment Devices - QHT RIVA FP Service Instructions Manual

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Third Part
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Control p.c.b. 11.62

1) Function

2) Selection and Adjustment Devices

3) Checking the Temperature

4) Operation Lights

5) Dip-switch Selector
1 Function
Inlet Information
On the Electronic control p.c.b.......
Function control*
C.h. temperature adjustment*
Function dip-switches
Max c.h. power adjustment

Ignition gas pressure adjustment

Boiler reset button*
*control panel fascia
From other boiler devices....
C.h. temperature probe NTC
Primary circuit flow switch
Room thermostat (if fitted)
Flame presence signal*
*from the full sequence ignition device
Outlet command
Pump
Full sequence ignition device
Modulation operator
Appliance operation lights*
Lock-out signal lamp*
*control panel fascia
RIVA HEAT ONLY SERVICE MANUAL – REV A
(edition-0106)
6) Ignition Gas Pressure Adjustment

7) Max C.h. Power Regulation

8) Anti-frost System

9) Hydraulic Parts Checking System

10) Checks

11) Removal of the Control p.c.b.
12) Thermal Control
The fundamental function of the Control p.c.b. is
that of controlling the boiler in relation to the
external needs (i.e. heating the dwelling) and
operating in order to keep the temperature of the
hydraulic circuits constant.
This is obviously possible within the useful power
and maximum working temperature limits
foreseen.
Generally, the Control p.c.b. receives inlet
information coming from the boiler (the sensors)
or from the outside (knob, room thermostat, etc.),
processes it and consequently acts with outlet
commands on other components of the boiler.
2 Selection and Adjustment Devices
On the Control p.c.b. several selection,
adjustment and protection devices are located.
(Figure 1).
Some of these devices are directly accessible by
the user (function control, temperature
adjustment potentiometers etc.) others are
accessible by removing the service panel or the
control panel lid.
K
J
I
H
G
A) J3 connector
B) J2 connector
C) Lock-out signal lamp
Control p.c.b. 11.62
E
F
Figure 1
A
B
C
D
5-1