COMMISSIONING
6 720 821 670 (2018/06) 37
EXTERNAL WIRING CENTRE
System components wired into terminal strip in accordance with system
manufacturers instructions.
Fig. 36 External wiring centre
[\] Earth connection
Appliance connection - ST1:
[L] Permanent Live feed to the appliance
[N] Permanent Neutral feed to the appliance
Appliance connection - ST2:
[LP] External pump Live feed from the appliance
[NP] External pump Neutral feed from the appliance
[LR] Demand (Live Return), input from wiring centre/junction box to
call the appliance to fire for heating/hot water
Wiring centre/junction box connection :
[L] Permanent Live feed to the wiring centre/junction box
[N] Permanent Neutral feed to the wiring centre/junction box
[E] Earth connection on the wiring centre/junction box
[SL] Demand (Switched Live), output to the appliance to fire for
heating/hot water
Refit electric control panel covers:
▶ Refit panel and secure with screws.
6 COMMISSIONING
6.1 PRE-COMMISSIONING CHECKS
▶ Check that the gas service pipe and water pipes are connected to the
correct position on the manifold.
1. Gas inlet (22mm)
2. Flow (22mm)
3. Return (22mm)
Fig. 37
▶ Check the gas type specified on the identification plate (1) matches
that of the gas supply.
Fig. 38 Data plate location
▶ Turn on the main gas supply, check the gas pipe work, connections
and rectify any leaks.
NE SLL
Wiring Centre/Junction Box
230V
MAINS SUPPLY
N
blue
brown
green/yellow
EL
NP LRLP
N
L
ST1 ST2
6720644744-26.2Wo
*
External Pump
90W max
L
E
N
WARNING: ELECTRIC SHOCK
▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS
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