Baxi Potterton 47-393-42 manual Making The Electrical Connections, Preliminary Electrical Checks

Terminal Block Cover

Fig. 55

Fig. 56 Cable Clamp Facia Panel

Fused Spur

L N

Room ‘Stat

N

		bk	1
230V		bk	2
		g/y
	N	b
	L	br
Fig. 57
	Frost	Thermostat
Fused Spur
L N
Room ‘Stat	230V
N

10.0Installation

10.8Making The Electrical Connections

The boiler is fitted with a 1.3m length of 3 core cable. This can be connected to the fused 3A 230V 50HZ supply.

NOTE: Both the Live and Neutral connections are fused.

To connect an external control proceed as follows:-

1.Slacken the facia panel securing screws and lift the outercase panel so that its securing tabs are clear of the facia. Remove the panel.

2.Completely undo the screws securing the facia panel and hinge it down (Fig. 55).

3.Undo the terminal block cover securing screw and remove the cover (Fig. 55).

4.Slacken the unused cable clamp on the LH side of the boiler chassis (Fig. 56). Insert the external control wiring through the clamp and route it to the terminal block.

5.Refer to the instructions supplied with the control.

IMPORTANT: The room thermostat MUST be suitable for 230V switching.

NOTE: An external frost thermostat cannot be used in conjunction with the integral timer. The integral timer can be replaced with the blanking plate supplied in the installation kit, and wiring connected as in Fig. 57.

6.Remove the link between terminals 1 & 2. The 230V supply at terminal 2 must be connected to the thermostat. The switched output from the thermostat must be connected to terminal 1 (Fig. 57). If the room thermostat being used incorporates an anticipator it MUST be wired as shown in Fig. 57.

7.Ensure that the external control input cable(s) have sufficient slack to allow the control box to drop down. Tighten the cable clamp on the boiler chassis.

8.Replace the terminal block cover, routing the external control input cable(s) through the second cut-out.

10.9Preliminary Electrical Checks

230V

bk 1

bk 2

1. Prior to commissioning the boiler preliminary electrical

system checks should be carried out.

External Clock	g/y
	b
	N
	br
	L

NOTE: The 230V switched signal for external controls (Frost Stat - Room Stat - Timer) must always be taken from terminal 2 at the boiler. Live, Neutral and Earth to power these controls must be taken from the Fused Spur.

2. These should be performed using a suitable meter, and

include checks for Earth Continuity,

Resistance to Earth, Short Circuit and Polarity.

© Baxi Heating UK Ltd 2012 35