Manual Kaysun KEM-07 DVN1 (page 33 of 48) (English)

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7.3 Operating characteristics

1. Set temperature in cooling

Range:10~20℃ （default：12℃）

If the set temperature is between 10~13℃, the compressor start and

shut down according to the difference between the inlet temperature

and the set temperature as follows:

Tin-Ts

If the set temperature is between 14~20℃，the compressor start and

shut down according to the difference between the inlet temperature

and the set temperature as follows:

Tin-Ts

2. Set temperature in heating

Range:35~50℃ （default：40℃）

If the set temperature is between 35~44℃，the compressor start and

shut down according to the difference between the inlet temperature

and the set temperature as follows:

Tin-Ts

If the set temperature is between 45~50℃，the compressor start and

shut down according to the difference between the inlet temperature

and the set temperature as follows:

Tin-Ts

5. Fan speed control

For correct operation of the unit with different ambient

temperatures, the microprocessor controls the fan speed based

on the ambient temperature and the condensing or evaporation

temperature as well as compressor frequency, thus enabling heat

exchange to be increased and/or decreased, maintaining the

condensing or evaporation temperature practically constant.

6. Frost prevention protection

To prevent the water freezing and damaging the plate heat

exchanger, the microprocessor will perform antifreeze protection

program if the heat exchanger temperature or the water

temperature below a certain temperature.

a. In the cooling mode or water pump mode: if the heat exchanger

temperature or the outlet temperature sensor is less than 3℃, the

compressor will shut down and the controller display Pb code, the

water pump will continue to run until the heat exchanger

temperature or the outlet temperature sensor is above 8℃ and the

unit will resume normal operation.

b. In the heating mode or standby mode: if the heat exchanger

temperature or the inlet temperature sensor is less than 8℃, the

controller display Pb code, the water pump will continue to run until

the heat exchanger temperature or the inlet temperature sensor is

above 15℃. If the heat exchanger temperature or the inlet

temperature sensor continues to fall below 5℃, the unit will be

forced heating operation, the compressor and the water pump will

be running until the heat exchanger temperature or the inlet

temperature sensor is above 15℃.

c. If the ambient temperature is less than 8℃and the heat

exchanger temperature or the inlet temperature sensor is less

than 2℃, the electric exchanger temperature heating will turn on

until the heat exchanger temperature or the inlet temperature

sensor is above 7℃.

If the unit is likely to operate below 0℃, it is advisable to add

antifreeze to the water system to prevent the unit from freezing the

system in the event of a power cut off or failure.

7. Fin heat exchanger high temperature protection

When the fin heat exchanger temperature over than 62°C, system

will shut down, but not returns to normal operation until the

temperature decreased less than 52°C.

8. Comp. discharge temperature protection

If the compressor discharge temperature is more than 115℃，the

compressor will be stop running until the temperature is lower than

83℃. The compressor starts with a 5-minute delay protection.

The set temperature refers to the set return water temperature or

inlet temperature;

In the event of a temporary power failure, when power returns, the

mode set previously will be retained in the memory.

3. Compressor start up delay

To prevent the compressor frequent start and stop, the compressor

must ensure that each start since the last stop since the minimum

time of 300 seconds.

4. The pump control and the flow switch control

The electronic board includes two pumps control output. The pump 1

running 3 seconds, the pump 2 starts running. The pump 1 starts

when the assembly is powered up and at least 285 seconds before

the compressor starts up and stops 120 seconds after the assembly

shuts down.

After the first 120 seconds of pump1 operation when the water flow

meets the operating requirements, the water flow alarm functions are

activated (differential pressure switch or flow switch). If the differential

pressure switch (or flow switch) detects a continuous closure for 15

seconds, the unit can run normally, otherwise, it will shut down and

display C8 fault.

In the unit operation process, if the continuous 10 seconds to detect

the differential pressure switch (or flow switch) is opened, the unit will

stop running and display C8 fault.

If there is a possibility that the outside temperature may drop

below zero, there is the risk of freezing.

The water circuit MUST BE EMPTIED AND SHUT OFF

POWER (when draining after heat pump operation take care

as the water may be hot) or antifreeze must be added in the

proportion recommended by the manufacturer.

TROUBLE SHOOTING

This section provides useful information for diagnosing and

correcting certain troubles which may occur in the unit.

This troubleshooting and related corrective actions may only be

carried out by your local technician.

CAUTION

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Kaysun KEM-07 DVN1 Manual

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