Commissioning The Boiler - Baxi Combi 80e Installation And Servicing Instructions

Control Box Cover
Fig. 27
Fig. 28
Cable Clamp
Fuse
Fused supply 3A Always fit fast
230V ~ 50Hz
blow 2A fuse
Live (brown)
Neutral (blue)
Earth (green/yellow)
1
230V
2
Terminal Block
External L
230 V
Controls
br
br
Selector /
b
Reset Switch
bk
bk
Key to Wiring
b - blue
br - brown
bk - black
r - red
g - green
22
Facia Panel
Frost Thermostat
br
b
Room Thermostat
g/y
230 V
bk
N
bk
L
N
External Clock
Fig. 29
Functional Flow Diagram
Pump
br
bk
b
br
Fan
br
b
b
r
b
r
r
g
g
PCB
b
br
bk
bk
br
r
r
g
g
Fig. 26
br
L
b
N
g/y
bk
1
SL
bk
2
Fig. 30
b
N
Pressure Switch
b
N
Safety Overheat Thermostat
Central Heating
NTC Sensor
DHW
NTC Sensor
Gas Valve
Gas Valve Modulator
Flame Sensing Electrode
r
Spark Electrode
b N
Spark
Generator
Hydraulic Differential Pressure Switch
DHW Flow Priority Microswitch
8.0 Installation
8.7 Making The Electrical Connections
To connect the mains input cable proceed as
follows:-
1. Slacken the facia securing screws and lift the
outercase panel so that its locating tabs are clear
of the facia. Remove the panel.
2. Remove the screws securing the facia panel
and hinge it down (Fig. 26).
3. Remove the control box cover securing
screws. Disengage the barbs on the control box
from the cover. Remove the cover (Fig. 27).
4. Slacken the cable clamp on the LH side of the
boiler chassis (Fig. 28). Insert the cable through
the clamp and route it to the terminal block.
5. Slacken the screws in the terminal block,
connect the input cable, and tighten the screws.
6. If an external control is to be connected it can
be done at this point. Run the input cable from
the external control through the second cable
clamp on the boiler chassis. Refer to the
instructions supplied with the control.
7. To connect external control(s) remove the link
between terminals 1 & 2. The 230V supply at
terminal 1 must be connected to the external
control. The switched output from the external
control must be connected to terminal 2 (Fig.
29).
NOTE: If the room thermostat being used
incorporates an anticipator it MUST be wired as
shown in Fig. 29
IMPORTANT: The external control MUST be
suitable for 230V switching.
8. Ensure that both mains input and, where
fitted, external control input cables have
sufficient slack to allow the control box to drop
down. Tighten the cable clamp(s) on the boiler
chassis.
9. If the optional integral timer is to be used it
should be fitted at this point. Refer to the
instructions supplied with the timer.
8.8 Preliminary Electrical Checks
1. Prior to commissioning the boiler preliminary
electrical system checks should be carried out.
2. These should be performed using a suitable
meter, and include checks for Ground Continuity,
Resistance to Ground, Short Circuit and Polarity.