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39
LT5052 (ISS 5)
MAINS CHECK
SET METER TO A.C. VOLTS AND SWITCH ON THE MAINS SUPPLY
1.
Connect meter to neutral and live terminal of mains supply (polarity is unimportant). Ensure that the meter
indicates normal mains voltage. If not it would indicate a "blown" fuse in the fused spur or three-pin plug.
Replace fuse if necessary and attempt to start. Proceed to Pressure Switch Check if unsuccessful.
PRESSURE SWITCH CHECK
Prior to carrying out the follow, ensure that the pipes connecting the pressure switch to the fan venturi are correct.
(‘+’ left hand side of pressure switch to top of fan venturi and ‘-‘ right hand side of pressure switch to bottom of fan
venturi.)
Important:
Before carrying out this test ensure that main supply is disconnected.
SET METER TO LOWEST OHMS RANGE AND DISCONNECT PRESSURE SWITCH PLUG.
1.
Connect meter to Yellow wire (Nc terminal) and Black wire (No terminal). The polarity is unimportant. The
switch is faulty if the meter indicates anything other that open circuit regardless of the switch position.
2.
Connect meter to Yellow wire (Nc terminal) and Red wire (C terminal). The polarity is unimportant. The
meter should show full scale deflection if the pressure switch is in the 'no flow' position and open circuit in
the 'flow' position.
3.
Connect meter to Black wire (No terminal) and Red wire (C terminal). The polarity is unimportant. The meter
should show full-scale deflection if the pressure switch is in the 'flow' position and open circuit in the 'no
flow' position.
4.
Steps 2 and 3 above will distinguish between a good switch which is connected correctly or a faulty switch
and/or incorrectly connected. It will also indicate if the pressure switch is stuck in either the 'flow' or 'no
flow' position.
5.
If no fault is found proceed to Fan check.
FAN CHECK
Important:
Before carrying out this test ensure that main supply is disconnected.
SET METER TO LOWEST OHMS RANGE AND DISCONNECT PRESSURE SWITCH PLUG.
1.
Connect meter to Brown wire (Low Speed) and Blue wire (Neutral) of the fan /pressure switch plug, and note
reading.
2.
Connect meter to Orange wire (High Speed) and Blue wire (Neutral) of the fan /pressure switch plug, and
note reading.
3.
A faulty fan would be indicted by either an open or short circuits.
4.
Connect meter to earth terminal and check continuity to fan leads in turn (Brown, orange and blue wires).
The meter should show open circuit in all three cases if the fan is wired correctly.
EARTH CHECK
1.
Connect either meter lead to earth and the other in sequence to the pressure switch leads (yellow, red and
black wires). If the meter shows anything other than an open circuit this would indicate a wiring fault,
possibly an earth short, which requires further investigation.