Certikin MB20S, Operating, Installation And Servicing Instructions

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3.0 Installation
19
Genie S
3.10 ELECTRICAL CONNECTIONS
WARNING: The appliance
MUST be earthed.
All wiring for the heater and system controls MUST
conform to I.E.T. Wiring Regulations, and work
should be tested using a suitable meter, for Earth
Continuity, Polarity, Short Circuit and Resistance to
Earth.
The heater supply must be through a common iso-
lator, a double pole 5A fused isolating switch with a
contact separation of 3mm minimum on both poles.
The cable used should be no less than 0.75mm
2
to
BS.6500 PVC, 3 core, and fi xed ensuring the earth
connection is longer than the Live and Neutral.
Access to the heater connections is made by the
removal of the front top panel and the electrical
chassis cover, two screws.
The simplest and most fl exible control scheme is to
use a Certikin CCP01 Control Unit. This provides an
electrical safety trip and timer with outputs for the
heater, lights and an auxiliary voltage free output. It
is pre-wired and tested and provided in a standard
IP55 plastic control box.
The heater’s internal wiring is illustrated in
5.4
Connections are as follows :-
4 Way Terminal Supply Connection
Earth
N Mains Neutral
SL Switched Live
L Permanent Live
A factory installed link has been fi tted between SL
and L which should be removed if the heater is to
have its own switched supply.
For systems using an external programmer, the
electrical wiring should follow the relevant control
manufacturer’s recommendations, with the switched
live from the controls returning to SL in the 4 way
push-fi t connector.
It is possible to connect several heaters together
using the multiple heater kit. Details for the parts
and installation of this kit are given in
3.13.
3.11 GAS CONNECTION
The 22mm copper gas connection provided can be
positioned to exit the heater on either the left or the
right hand side. A minimum of 19mb. (NG), 35mb
(propane) 26 mbar (butane) must be available at the
heater inlet, with the heater and other connected gas
appliances operating at nominal load.
NB: If the gas valve test point is used
there is a 2-2.5 mbar drop for the Genie
50 at full rate.
Check for gas tightness (B.S. 6891: 1988) in pipework
to boiler using a manometer. Gas leakage and sound-
ness within the heater should also be checked using
sense of smell and leak detection fl uid.
Inlet pressure
tapping