GRUNDFOS INSTRUCTIONS
9
6.5 Weather, Temperature and long-term storage.
The PHT A unit needs to be protected against the weather and extremes of temperature during
summer and winter. Provision to maintain the PHT A’s operating conditions needs to be made
within the overall system design and location setting.
The PHT A unit must be protected from freezing conditions. Should the unit be placed outside
then the unit needs to be protected against the weather and consideration must be made for
trace heating and/or lagging.
The PHT A unit must be protected from heat. Should the unit be placed in an environment that
could potentially become hotter than the operational recommendations then air venting and
circulation must be considered.
If the PHT A unit is being stored during periods of frost the whole unit should be drained to
avoid damage. Remove all drain and vent plugs and allow the unit to drain.
Do not replace the plugs until the PHT A unit is to be used again.
6.6 Operating Environment.
The PHT A unit must not be used in an environment which has been classified as
hazardous where it could provide a source of ignition and therefore cause an explosion by
flame path.
Grundfos do not accept any responsibility for the use of the PHT A unit to pump liquids which
could be construed as being hazardous to health either by touch, ingestion or inhalation of
fumes or gases given off by the liquid.
6.7 Installation Location.
Careful consideration must be given to the location of the PHT A unit.
The following are minimum requirements:
The PHT A unit should ideally be placed in a location where the control panel and status LED can
readily be seen, and the internal buzzer heard without obstruction.
These are primary warning and alarm events and should be available to be observed and heard.
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