Armstrong ABX BR AZED PL ATE HEAT EXCHANGERS Инструкции по установке и эксплуатации - Страница 2

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i n sta l l at i on &

op era t i ng i n str u ct i on s

4 . connection location

Application

fluid 1

cold water

Heating, Cooling

a2a1

Evaporator

refrigerant

single refrigerant

a2a1

refrigerant

Condenser

a1a2

5 . mounting suggestions

There are four different ways to mount the abx:

a Bottom support

b Sheet metal bracket,

c Crossbar& bolts,

d Stud bolts

• All items should be supported independently.

• Do not apply excessive forces to the fittings.

• Except for small sized abx030 model, our abx cannot be

fastened directly to the fittings/piping.

• Use flexible hoses or vibration dampers to reduce pulsation,

shock or vibrations that are caused by the operating system.

abx Brazed

Plate Heat Exchangers

fluid 2

hot water

b1b2

chiller water

b1b2

cooling water

b2b1

6. operating instructions

Start-Up Venting: During the filling process the unit must be

vented to eliminate any trapped air. This will assure proper

performance and longevity of the unit.

Shut Down: The two sides should be shut down simultaneously

and slowly. If this is not possible the hot side should be shut

down first. If the unit is shut down for an extended period of

time, it must be drained and cleaned. This is especially true

if there is a risk of frost or in the presence of any aggressive

medium inside the heat exchanger

7. anti-freezing protection

methods for bphe:

Any formation of freezing or icing will damage bphe and the

refrigeration system. The following methods will prevent bphe

evaporation from freezing:

• Use brine (e.g. glycol) when evaporation temperature is

close to the freezing point.

• Low working pressure will cause low evaporation

temperature. If the evaporation temperature is below 32°f

(0°c), it will cause water to freeze. Since the bottom portion

has the lowest temperature, it is the most likely spot for the

abx to crack.

• To start the refrigeration system, always start the water

pump for a few minutes and then start the compressor. To

stop the system, always stop the compressor first and then

stop the water pump.

1 Low Pressure Cut-off Switch (LP)

A low-pressure cut-off switch should be installed with

properly set values. When the actual evaporation pressure

is lower than the setting value, the compressor

will be cut off automatically.

2 Low temperature thermostat (LT)

The function of thermostat is to prevent evaporation

temperature going under 0°c. If evaporation temperature

is always above 0°c, then water has no chance to freeze

and expand

3 Water temperature sensor Installation of anti-freeze

temperature sensor neat the water outlet is another

method to prevent the water from freezing. The suggested

setting temperature is at 4°c for buffering process

4 Water Flow Switch Installation of a water flow switch in

the water circuit can prevent possible abx freezing up due

to low water flow rate. Usually, low water flow rate may be

caused by malfunction of water pump, leaking Pipes, pipe

blockage due to pipe contamination or dirty filter.