Revision: 09/2014
W 3552-6.02e.E
Page 11 / 16 MWi
Instruction manual
BDP2
9
PRIOR TO COMMISSIONING
Commissioning and start up of the BDP2 is not permitted until a safety analysis of the entire refrigeration installation
has been carried out.
On completing installation of the BDP2, the refrigerant plant must be pressure tested. Records of the testing must be
kept in a safe place. The BDP2 system should be vented and connected to the main plant.
9.1
CHARGING THE SYSTEM
Charging refrigerant oil will make it possible to observe whether the oil return is working properly and the
compressor will not shut down due to lack of oil.
9.1.1
AMMONIA SYSTEM
In ammonia systems the BDP2 and the heat exchanger should be filled with compressor oil.
9.1.2
SYNTHETIC REFRIGERANT SYSTEM
It is recommended to charge systems operating with synthetic refrigerants with approx. 3% refrigerant oil in the
low-pressure side (attention with the miscibility gap).
10.
COMMISSIONING
The refrigerant / heat pump system should be started-up without the BDP2, to make sure any dirt is flushed out off
the system. It is recommended to wait until the oil of the compressor has been changed for the first time to make
sure most of the dirt is removed.
Check that
the max. allowable pressure is not exceeded (see data plate)
the pressure in the BDP2 housing cannot increase more than 3 bar above the lowest possible pressure in
the compressor suction line (particularly during stand-still, with two-stage systems and with open economiz-
ers)
all pipes are connected correctly according to the technical drawings.
11.
OPERATION
During operation the free supply of oil respectively refrigerant/oil mixture into the BDP2 must be provided, as men-
tioned in sections 6.1 and 6.2.
Formation of condensate or frost indicates the liquid refrigerant/oil level within the BDP2. Since the BDP2 is manu-
factured using stainless steel, there is no danger of corrosion. In some cases it can be favourable to install a drip pan
under the BDP2.
The hot gas solenoid valve should be activated over a period of 1 to 10 minutes– depending on the size of the BDP2
and the system concept (time or demand control) – to push the liquid content out of the BDP2. The timer can be
adjusted by observing the outlet temperature and system conditions.
