Revision: 09/2014
W 3552-6.02e.E
Page 16 / 16 MWi
Instruction manual
BDP2
It is not possible to state exact times for pushing out the refrigerant, because it is influenced by too many factors,
e.g., the size of the BDP2, the refrigerant and the refrigerant oil, the actual viscosity and the temperature.
The required time to push out the content can be determined by, e.g., observing the side glass at the BDP2 outlet
and adjust the time accordingly.
The next cycle should not be started right after finishing to push out the content (see 6.6).
In addition, please adhere to the previously made recommendations in section 11. of this instructions.
13.6.
HEATING ELEMENT
At evaporation temperatures below t
0
< -30°C an additional heating element is required. It should be installed accord-
ing to the manufacturer’s installation requirements.
14.
TROUBLE SHOOTING
Symptom
Possible cause/corrective action
14.1
BDP2 DOES NOT FILL WITH LIQUID
Valve in the supply line is closed
Open the valve
Gas trapped in the supply line
Check valve position and slope of the supply line
Lack of refrigerant
Check level in the surge drum, investigate cause
for insufficient charge
Internal piston stuck in upper position
Check solenoid valve in the hot gas line, eliminate
contamination inside the BDP2
Incoming liquid too viscous
Check installation of trace heater
Orifice (hole in the internal piston) is blocked
Clean the orifice, see 12.2 and 12.4
14.2
CYCLE DOES NOT WORK
Not sufficient hot gas pressure
Open the regulating valve of the hot gas line
(e.g. the top service valve on the high side float
regulator)
Solenoid valve in the hot gas line does not open
Check solenoid valve and its control
Liquid in the hot gas line
See chapter 6.4
BDP2 connections mistaken (wrong way round)
See chapter 8. , incorrect installation
Liquid discharge at too high pressure
Check hot gas line, heat exchanger and filter for
possible blockages
BDP2 does not fill with liquid
See above 14.1
14.3
CONTINUOUS LIQUID DISCHARGE
Connection point for the oil return at too low pressure See chapter 6.7
Check valve is not working properly
see 12.3, or replace check valve
14.4
INTERNAL PISTON STUCK IN UPPER POSITION
Orifice of the valve mechanic blocked
See chapter 12.2
Internal contamination prevents proper piston movement
Dis-assemble BDP2 and clean the internal parts
14.5
TOO MUCH OR NOT ENOUGH RETURNED OIL
Incorrect positioning of the supply connection
See chapter 6.1 & 6.2
Number of cycles not correct
Check and adapt to requirements
Oil concentration not adequate
Check and adapt to requirements
There is no oil in the supply line
See chapter 6.1 & 6.2
Control of the hot gas solenoid valve not correct
Check and adapt to requirements
14.6
OPTIONAL LEVEL SWITCH DOES NOT ACTIVATE
level switch is damaged
See instructions of the manufacturer
Heating element is damaged
See instructions of the manufacturer
