Hydraulic Connection Of The Condenser - Johnson Controls CWP Manual De Instalación Y Mantenimiento

Installation
The capacity of the expansion vessel must
allow for an expansion of at least 2% of the
volume of the fluid in the circuit (evapora-
tor, piping, user circuit and standby tank, if
any). The expansion vessel needs not be
isolated, because no water can circulate in-
side it.
A flow meter, to disable the appliance when the
h
water is not circulating.
The flow meter shall be connected (termi-
nals 7-8).
To install the flow meter, conform to the manufactur-
er's instructions.
As a general rule, the flow meter must be mounted
on a horizontal pipe, and its distance from the
curves must be 10 times the diameter of the pipe, far
from valves or other components that may hinder the
water flow upstream of or downstream from the flow
meter.
The air exhaust valves must be mounted in the
h
highest point of the piping.
The stop valves must be mounted on the water in-
h
let/outlet piping of the evaporator and the heat re-
covery condenser.
The drain points (provided with plugs, cocks etc.)
h
must be positioned in the lowest point of the pip-
ing.
Furthermore:
Provide the evaporator with a by-pass circuit
h
equipped with valve, to wash the plant.
Insulate the piping, to prevent the risk of heat loss.
h
Install a filter on the suction side of the evaporator
h
or the heat recovery condenser.
Before filling the circuit, it is important to
check that it is free from any foreign matter,
sand, gravels, rust, welding deposits, waste
and other materials that may damage the
evaporator.
When cleaning the lines, it is recommended to cre-
ate a circuit by-pass. It is important to mount a filter-
ing medium (30 mesh) upstream of the chiller.
If necessary, the water required to fill the
circuit must be treated to obtain the request-
ed PH.
Page 12
4.4 Hydraulic connection
of the condenser
The external hydraulic circuit must ensure
the water flow to the condenser under any
working or adjustment conditions.
The cooling of the units is generally ensured by con-
necting the condenser to a cooling tower, though the
units can be cooled also with well water.
In the presence of a water-cooled condenser, it is
necessary to check the flow rate and/or the tempera-
ture of the cooling fluid that flows through the con-
denser, so as to maintain the refrigerant pressure at
values that can ensure a satisfactory operation.
When a cooling tower is used, the simplest regula-
tion methods consist of checking the operation or the
speed of the fan or the air volume, by means of a
damper, once the pilot thermostat has been installed
in the basin of the tower.
Alternatively, or if no water from a cooling tower is
used, you can adopt a recirculaton system provided
with a 3-way valve.
This circuit shall consist of:
A circulation pump that can ensure the necessary
h
capacity and discharge head.
A flow meter to turn off the appliance when no wa-
h
ter is circulating.
The flow meter must be connected in series,
as shown in the wiring diagram of the con-
trol panel.
To install the flow meter, follow the manufacturer's
instructions.
As a general rule, the flow meter shall be mounted
on a horizontal pipe, at a distance from the curves
equal to 10 times the diameter of the pipe and far
from valves or other components that are likely to
hinder the water flow upstream of or downstream
from the flow meter.
The bleed valves must be mounted on the highest
h
point of the piping.
The stop valves must be mounted on the piping of
h
the water entering/leaving the condenser.
The discharge points (provided with plugs, cocks
h
etc.) must be arranged in the lowest point of the
piping.