CTC Union GSi 600 Series, Installation And Maintenance Manual

Page: 40 / 136

40 CTC GSi 600
7.1.2 Valves
Ft the valves as shown in the schematic diagram on the next page. To
facilitate servicing of the cooling unit, shut-off valves must be fitted to both
the incoming and outgoing connections. Fit bifurcated valves so that it is
possible to fill and bleed the collector circuit later.
7.1.3 Insulation against condensation
All pipes in the brine system must be insulated against condensation to
prevent the possibility of severe build-up of ice and condensation.
7.1.4 Filling and venting
The collector coil should not contain any air as even the smallest amount of
air can jeopardise the heat pump’s operation.
Mix water and antifreeze solution in an open vessel. Connect hoses to the
shut-off valves (98a and 98b) as shown in the figure. NB: The hoses must
have a minimum diameter of 3/4". Connect a powerful external pump (100)
for refilling and bleeding. Open the valves (98a and 98b) so that the brine
passes through the mixing container (101). Also make sure that the valve
(98d) is open.
If the heat pump is connected to the power supply, start the brine
pump (102) as follows:
• Open the "Installer/Service/Function Test" menu.
• Select the "Brine Pump" option and activate it. The brine pump runs
until it is manually stopped.
Allow the brine to circulate in the system for a long period of time until it is
completely free of air. There could still be air in the system, even though no
air accompanies the liquid out.
Bleed the level vessel (96) by loosening the plug on the top of the level
vessel.
Now close the valve (98a) while the filling pump continues to run. The filling
pump (100) now pressurises the system. Also close the valve (98b) and shut
off the filling pump.
If the level in the level vessel is too low, close the valves (98c) and (98d).
Unscrew the plug and fill the vessel to around 2/3 full. Screw the plug back
in and open the valves (98c) and (98d).
7.1.5 Pressure/level switch
In some cases, extra protection is required due to local requirements or
provisions. For example, the requirement in some areas is for the system to
be installed within a water catchment area. If there is a leak, the compressor
and brine pump stop and the "Flow/level switch" alarm appears on the
display. For connection, refer to the "Electrical Installation" chapter.
i
Use the ”Brine pump
on 10 days” function
to bleed the system
properly.