Safety; Sources Of Danger; Safety Precautions - Honeywell PCR-310 Installation And Operating Instructions Manual

4 Safety

4.1 Sources of danger

Caution - Mains voltage!
Never expose the unit or transformer to water or moisture. Risk of
malfunction and short circuit. Only use the unit when it is adjusted
to normal ambient temperature (+15 to +30 °C). Extreme changes
in temperature in combination with high atmospheric humidity
may lead to the formation of condensed water.
Even if the control-circuit voltage is switched off, high voltage may
still be applied to the unit. For this reason, isolate all electric
circuits before starting any service work.
Never expose the unit or transformer to excessive heat, dust and
vibrations. Avoid knocks and pressure loads. If the housing is
damaged, there is a risk of an electric shock causing death or injury.
If the unit cannot be operated without the risk of danger, it must
be taken out of service and precautions taken so that it cannot be
switched on again unintentionally.
This applies, in particular, if:
The housing has damage which is visible,
the unit is no longer operational or
it has been stored for a long time in unfavourable conditions.
The unit and transformer must not be opened. If the unit or
transformer is assumed defective, send it back to the dealer or
manufacturer with a precise description of the defect.

4.2 Safety precautions

All electromagnetic loads (solenoid valves, contactors, alarm horns,
motors) should be interference suppressed directly at the coil with
RC elements. Please note the maximum contact rating of the relays
and terminals.
If this is not observed, there is a risk that the contacts may pit or
stick, with the result that the refrigeration system will not operate
correctly and the refrigerated items may be damaged.
Sensor leads are to be routed separately from mains voltage wires:
the clearance should be at least 5 cm.
Sensor leads must not be routed in multiple cables with other leads
carrying mains voltage, otherwise the system may malfunction.
Tighten the terminals carefully; excessive strain will result in
damage to the controller or transformer.
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