5
Design level
Voltage:
21 = 230.1.50
22 = 230.3.50
38 = 400.3.50
General
General description
The model BCH heat pump is an air to air type of equipment
that provides air conditioning in summer and in winter by
reversion of its operating cycle.
It can be located either indoors or outdoors since it is
protected to withstand weathering and the centrifugal fans
allow the connection of ductwork.
It is delivered totally equipped, factory tested and ready for
the incorporation of the electric heater accessory, indoor or
for ductwork.
Designed to achieve an important energy saving and a long
operating life by the incorporation of an electronic control
module.
Temperature adjustment is achieved by means of the 24 VAC
ambient thermostat.
Nomenclature
Balance point
Since the heat pump operates by extracting heat from the
outdoor air, it is possible that sometimes this temperature is
so low that the extracted heat is insufficient to satisfy the
heating demand. For these conditions the electronic module
has six balance points (between - 4 and 14 °C), one of which
will be adjusted during the start-up. Below this temperature
the supplementary electric heater will come into operation.
The heat pump will nevertheless continue to operate with a
COP greater than that of the electric heaters until the outdoor
temperature drops below -20°C.
Below this temperature the heat pump will automatically stop
operating and will only use the electric heaters to warm the
space. This prevents the compressor from operating with
very high compression ratios that will shorten its operating
life.
Compressor safeties
A temperature sensing element protects the compressor
against too high discharge temperatures.
A pressure cutout stops the compressor when the discharge
pressure is too high.
It also actuates in case of a refrigerant leak or because of an
insufficient air flow across the coils.
Defrost control
The defrost cycle starts after a period, set at will, of 30, 60 or
90 minutes after start or last defrost cycle and the liquid line
temperature is -5°C or less.
Start timer
It prevents frequent stops and starts. After stopping, the unit
does not start again until 2 or 5 minutes, set at will, have
elapsed.
Control panel
The control of the BCH heat pump operation is done by
means of thermostat that allows the following:
1- Setting of the desired temperature.
2- Automatic availability of heating or cooling as desired.
3- Control that the operation of the indoor fan be continuous
or intermittent depending on the operation of the com-
pressor.
4- Operate the electric heaters shutting down the rest of the
unit.
Technical specifications
Mechanical specifications
Compressor
Of the vertical hermetic type, mounted on shock absorbent
blocks, equipped with a low consumption motor.
It is delivered with a charge of a special oil that prevents foam
formation and with an electric oil heater.
Compressor oil heater
Keeps the crankcase oil hot to ease starts and prevent the oil
from being carried away from compressor.
Suction accumulator
Connected to the suction tube of the compressor it protects
it against liquid strokes, preventing the oil from coming out of
the compressor.
Suction exchanger
Formed by the suction and liquid tubes of the circuit, protects
the compressor by preventing the liquid refrigerant from
Horizontal packaged heat pump
Nominal power:
Cooling Heating
7 = 6 400 W / 7 100 W
10 = 9 200 W / 10 800 W
12 = 11 600 W / 12 700 W
15 = 14 000 W / 14 300 W
20 = 17 900 W / 18 000 W
25 = 21 700 W / 22 500 W
30 = 27 000 W / 28 500 W
Control
To achieve maximum energy saving and a perfect operation
of the equipment, that will avoid breakdowns and prolong its
operating life, the BCH heat pump incorporates the following
features:
BCH 7 21 A
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