Fully Pumped Using Two Pumps; First Lighting; Preliminary Electrical System Checks - Potterton Flamingo RS40 Installation And Service Manual

Installation Section – Page 13
FIG. 11 FULLY PUMPED USING TWO PUMPS

8. FIRST LIGHTING

Before lighting the boiler, the gas installation must be tested for soundness in accordance with CP331 Part 3 1974.
The electrical installation must be checked as follows:-
8.1 PRELIMINARY ELECTRICAL SYSTEM CHECKS See Figures 6 and 12
A. Earth Continuity Check - appliance must be electrically connected - meter set on Ω (ohms) x 1 scale and
adjust to zero if necessary.
a) Test leads from any appliance earth point to earth pin on plug resistance should be less than 1 Ω (ohm).
If the resistance is greater than 1 Ω (ohm) check all earth wires for continuity and all contacts clean and tight.
If resistance of earth is still greater than 1 Ω (ohm) then this should be reported to your supervisor.
B. Short Circuit Check - appliance electrically disconnected, all switches ON including stats.
a) Meter set on Ω (ohms) x 1 scale.
Test leads from L to N in appliance terminal strip/ block - if meter reads '0' then there is a short circuit.
b) Meter set on Ω (ohms) x 100 scale.
Repeat test with leads from L to E. If meter reads less than ∞ (infinity) there is a fault.
NOTE: Should it be found that the fuse has failed but no fault is indicated - a detailed continuity check (i.e. by
disconnecting and checking each component) is required to trace the faulty component. It is possible that a fault could
occur as a result of local burning/arching but no fault could be found under test. However, a detailed visual inspection
should reveal evidence of burning around the fault.