Pump Down Procedure; Purpose Of Pump Down; Precautions To Take Before Performing Pump Down; Pump Down - Immergas AUDAX PRO 5 Instruction And Recommendation Booklet

8 PUMP DOWN PROCE-
DURE.

8.1 PURPOSE OF PUMP DOWN.

Pump down is used to accumulate coolant
in the outdoor unit before disconnecting the
chiller lines.
8.2 PRECAUTIONS TO TAKE BEFORE
PERFORMING PUMP DOWN.
Due to the compact nature of its shape, the unit
contains a small load of coolant
Before performing pump down, most of the load
can be transferred to an empty tank.
Attention: the maximum amount of coolant that
can be accumulated in the outdoor unit is 5 kg.
Accumulating larger quantities of coolant risks
causing the compressor to stop or burn out.
8.3 PRECAUTIONS TO TAKE BEFORE
PERFORMING PUMP DOWN.
1 Close the manometric unit.
2 Close the liquid service valve.
3 Press the K2 button on the outdoor unit PCV
three times; this makes the (
appear on the board LED display
4 Keep an eye on the manifold low pressure gauge
while the compressor is running.
5 When the indication on said pressure gauge
goes below 0 MPa (0 kgf/cm²) eff., close the gas
service valve and abandon pump down (pump
down can be abandoned by pressing the K2
button again or by pressing the K3 button to
reset).
Attention: Coolant can only be transferred to
appropriate tanks. Otherwise, explosions can
occur with subsequent damage to things and
injury to people.
N.B.: Repositioning the Air-Water heat pump.
- If the unit must be repositioned, do as follows:
- Perform pump down (put the above procedure
in action).
Tank valve
R-410A
Scale
Valve 2
8-1
- Transfer as much coolant as possible to an
external tank in order to accumulate no more
than 5 kg in the outdoor unit (see parag. 8.4 for
details on coolant loads)
- Disconnect the power cable.
- Disconnect the connection cable between the
outdoor and indoor unit.
- Disconnect the pipes from the indoor unit
flared couplings.
- To prevent foreign objects from getting in,
immediately plug the indoor unit couplings
and the pipes they were connected to with vinyl
caps.
- Disconnect the pipes from the external unit
flared couplings. To prevent foreign objects
from getting in, immediately plug the outdoor
unit couplings and the pipes they were con-
nected to with vinyl caps.
- Be careful not to damage the couplings and the
terminal boards.
- Move the indoor and outdoor units to their
respective new positions.
- Disassemble the indoor unit securing devices
and reassemble them in the new position.
) indication
Outdoor unit
Gas side
Liquid side
Valve 1
Manometric Service valve
unit
8.4 TRANSFERRING THE COOLANT
Do as follows before performing pump down if
the load quantity exceeds the maximum quantity
that can be accumulated in the outdoor unit.
1 Get an empty tank for R-410A, a scale and a
pressure gauge manifold.
2 Identify the load quantity contained in the
chiller circuit.
3 Connect the tank to the outdoor unit and
run approximately 50% of the indoor unit in
cooling.
4 After about 10 minutes, check the pressure on
the high side on the manifold pressure gauge.
If it exceeds 3.0 MPa (30.59 kgf/cm²) eff., you
must reduce the quantity of the indoor units
in order to bring it back under 3.0 MPa (30.59
kgf/cm²).
5 As soon as the pressure goes below 3.0 MPa
(30.59 kgf/cm²) eff., open the manometric unit
2 tap, connected to the liquid side. Then open
the receiving tank valve to allow the coolant to
flow.
6 Using the scale, check the quantity of coolant
that has been transferred to the tank. Close the
liquid valve and disconnect the pressure gauge
manifold as soon as the desired quantity has
been reached.
7 The quantity of transferred coolant should
correspond to 50% of the entire load contained
in the chiller circuit.
8 The amount of the load remaining in the cir-
cuit must not exceed the quantity that can be
accumulated in the outdoor unit.
26 26
INTO AN EXTERNAL TANK BEFORE
PERFORMING PUMP DOWN.