On/Off Control Regulation Type; Constant Vacuum Regulation Type In Hospivac; Choice Of Room - MIL'S HOSPIVAC Manual De Operación Y Mantenimiento

3.1. ON/OFF control regulation type

The vacuum pump is switched on at the low level of vacuum and is stopped at the high level.

3.2. Constant vacuum regulation type in HOSPIVAC

When the vacuum pump is switched on, the operation is forced during a FLEXO time: FLEXO regulation.
During this time, it is necessary to limit the vacuum level. So, when the network pressure reaches –880 mbar,
the constant vacuum solenoid valve opens in order to inject a sufficient volume of air under the suction valve
of the vacuum pump to generate a difference of pressure upstream and downstream from this valve so that
it is closed.
When the network pressure reaches –830 mbar, the constant vacuum solenoid valve is closed, the suction
valve of the vacuum pump opens, and the vacuum pump operates. This simple system makes possible "to
disconnect" the vacuum pump of the network in full safety and to ensure a constant vacuum.
Normal operation = solenoid valve is closed
P1 P0
P1 = P0 the suction valve is opened

CHOICE OF ROOM

The unit must be located in a clean, non-humid, non-saline, dustless and ventilated local whose the
temperature should be between +5C and +40C.
Forced ventilation controlled by a thermostat must be installed to ensure adequate room ventilation.
�� × �������� × ��������
The following formula can be used to size the fan:
�� = = �������� ×
∆��° × ��������
With:
Q = Ventilation volume (m³/h)
P = Vacuum pump energy consumption (kW)
ΔT = Temperature difference between the local and outdoor
1250 = Volumetric heat capacity Cp (J.m³.K -1 )
519991-08
HOSPIVAC – MINIVAC – MEDIVAC - EVISA E25 → E300
Discharge = solenoid valve is opened
P1 P0
P1 > P0 the suction valve is closed
��
∆��°
Example: Vacuum pump power 16.5 kW
ΔT eligible = 10°C ����. ��
�� = �������� × = �� ������ ��
����
�� ��������
The air inlet area must be dimensioned such that the flow rate does not exceed 3 m/s.
�� = =
(Extreme tolerance of 5 m/s).
�������� × �������� �� × ��������
For information purposes, the table below gives the amounts of heat that must be extracted, according to
the installed capacity in kW
Total
installed Heat released
capacity
kW kW/h kJ/h Th/h
5 5.22 18792 4.3
10 10.45 37620 8.6
15 15.67 56512 12.9
20 20.90 75240 17.2
25 26.12 94032 21.5
30 31.35 112860 25.8
The person in charge of the installation has overall responsibility of the product environment requirements.
He is also in charge of setting up methods of struggle against fire and to protect vacuum units against shocks,
flooding, earthquake and corrosion.
The technician or exploiting is responsible for building construction and civil engineering infrastructures or
earthwork.
Outdoor deadline pressure (snow, wind, rain...) must be taken into account.
Environmental constraints must be managed.
According to the standards NFS99-175 (§ 5-7-3) and ISO 7396-1 (§ 5-8) vacuum units must not be in the same
room as O concentrator, gas bottles and non-cryogenic liquid.
2
/��
��
= ��. ���� ��²
Ventilation of room
Ventilation Air inlet area
flow rate of 3 m/s
kCal/h
m³/h (m 2 )
4300 1440 0.14
8600 2880 0.28
12900 4320 0.42
17200 5760 0.56
21500 7200 0.7
25800 8640 0.84
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