Operation Sequence; General; Occupied Mode - Prolon PL-M1000 Series Hardware Manual

Intelligent zone control system

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Table of Contents

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General

The ProLon M1000 Heatpump controller receives readings from three different temperature sensors:

outside air, return air and supply air. It operates on a configurable schedule using an internal real-

time clock. Also, as a Master device, it receives data from the zone controllers sent on the network

bus. The controller then analyzes all the data and demands sent by the zones and commands the

appropriate outputs to respond accordingly, within parameters set by the temperature sensors and

other safety limits. The Master sends back information on its network such as supply air

temperature, occupancy status and other relevant data for the zone controllers to use.

Occupied Mode

The controller operates the fan continuously. When there is a cooling demand from the zones, the

Heatpump controller will put the reversing valve into cooling mode and activate the compressor

outputs as long as all temperature limits, delays and other related parameters are respected. Once

the demand is satisfied, the outputs are deactivated within the prescribed minimum on/off time

delays.

When there is a heating demand from the zones and the outside temperature is above the low

balance point, the Heatpump controller will put the reversing valve into heating mode and activate

the compressor outputs as long as all temperature limits, delays and other related parameters are

respected. If the outside temperature is below the low balance point, the controller will activate the

auxiliary heating outputs. If the heatpump is configured for water-to-air mode, it will only use the

compressor for heating. Once the demand is satisfied, the outputs are deactivated within the

prescribed minimum on/off time delays.

When there is no cooling or heating demand from the zones, only the fan operates. If the heating

equipment permits, a supply air pre-heating sequence may be enabled. This allows cold mixed air to

be heated to a more comfortable level for subsequent use by the zones for ventilation.

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HEATPUMP HARDWARE GUIDE