Installation And Pump Management If External To The Unit; Only-Ewmimh Heat Pump 138÷262); Minimum Hydraulic Circuit Contents; Hydraulic Data - Hitecsa ADVANCE EWMIM 120 Mode D'emploi

II.7.3 INSTALLATION AND PUMP MANAGEMENT IF EXTERNAL TO THE UNIT (ONLY FOR EWMIM
COOLING ONLY-EWMIMH HEAT PUMP 138÷262)
The circulation pump to be installed in the main water circuit should be selected to overcome any pressure drops, at nominal rates of water flow, both in
the exchanger and in the entire water system. The operation of the user pump must be subordinated to the operation of the unit; the microprocessor
controller performs the control and management of the pump according to the following logic: when the machine is turned on, the first device that starts
is the pump, priority over the rest of the plant. During start-up, the differential pressure switch of minimum water flow mounted on the unit is ignored, for
a preset time, to avoid slippage due to air bubbles or turbulence in the hydraulic circuit. After this time, the definitive consent to start the machine is
given. The pump maintains a functioning strictly related to the operation of the unit and is only excluded when the shutdown command is activated. After
switch-off, the pump will continue to operate for a pre-set time before finally stopping, in order to disperse the residual heat in the water exchanger. See
also the attachment section "Hydraulic circuits".
II.7.4

MINIMUM HYDRAULIC CIRCUIT CONTENTS

To ensure the unit works correctly, the system needs a minimum volume of water The minimum water content is determined on the basis of the unit's
cooling or heating capacity (for heat pumps) in the design of the unit, multiplied by the coefficient expressed in 3 l/kW (*) If the water content of the
system is below the minimum value calculated, install an additional tank However, remember that a high water content in the system always goes to the
advantage of comfort in the room, as it ensures a high thermal inertia of the system.
(*) For heat pumps air cooled, also pay attention to the temperature difference generated during the natural defrosting cycles:
DT tank and/or DHW (by defrost effect)
Specific capacity
II.7.5

HYDRAULIC DATA

Model
Safety valve calibration of channelled water
Heat exchanger water content
Expansion tank capacity
Expansion tank pre-load
Expansion tank maximum pressure
Tank water content ASP1/ASP2 ASPI1/ASPI2 (138÷262)
Minimum flow rate (water differential pressure switch intervention)
Tank litres (120÷130)
The expansion tank on the machine has limited capacity to protect the hydraulic circuit inside the machine. It is the installer's duty to size and install an
expansion tank that is suitable for the system.
II.7.6

PROTECTION FROM CORROSION

Do not use corrosive water containing deposits or debris. hereinafter
the corrosive limits for brazed stainless steel heat exchangers:
pH
SO4--
HCO3-/SO4--
Total hardness
CI-
PO43-
NH3
Fe+++
Mn++
CO
2
H S
2
Temperature
Oxygen content
Alkalinity (HCO )
3
Electrical Conductivity
Nitrate (NO )
3
If you are not reasonably sure of the water quality in the table above or
if there are doubts concerning the presence of different materials which
could corrode the heat exchanger over time, it is always advisable to
insert an intermediate heat exchanger which can be inspected, made of
materials that are able to resist these substances.
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
K
l/kW
7.5 ÷ 9.0
< 70 ppm
> 1.0 ppm
4.0 ÷ 8.5 dH
< 50 ppm
< 2.0 ppm
< 0.5 ppm
< 0.2 ppm
< 0.05 ppm
< 5 ppm
< 50 ppb
< 65 °C
< 0.1 ppm
70 ÷ 300 ppm
μS/cm
10 ÷ 500
< 100 ppm
20 15 12
3.5 5 6
120 125 130
bar 6 6 6
l 1,9 2,2 2,2
l 0,5 0,5 0,5
barg 1 1 1
barg 10 10 10
l - - -
l/h 1450 1450 1450
l 110 110 110
II.7.7

PROTECTING THE UNIT FROM FROST

IMPORTANT!
If the unit is not used during the winter period, the
water contained in the system may freeze.
When the unit is running, the control board protects the water side heat
exchanger from freezing by triggering the antifreeze alarm, which stops
the machine if the temperature of the sensor fitted on the heat
exchanger reaches the set point value and simultaneously maintains
the circulation pump active.
With the unit in OFF but maintained powered if the water probe exiting
the exchanger detects a lower temperature than the antifreeze set
point, activates the circulation pump and the antifreeze heater
resistance and possible heating resistance of the pump / storage tank
(accessory RAE-RAS) if here I'm.
IMPORTANT!
If the master switch is opened, it cuts the power
supply to the plate exchanger heater and the
compressor crankcase heater. The switch should
only be disconnected for cleaning, maintenance or
repair of the machine.
IMPORTANT!
When the unit is out of service, drain all the water
from the circuit.
The entire circuit must be drained in good time, a drainage point below
the water exchanger must be used to make sure all the water empties
out. Moreover, use the valves placed in the lower part of the water
exchanger so that is empties completely.
59
ADVANCE
10 8 7
7 9 10
138 146 154
3 3 3
3,2 3,2 3,8
14 14 14
1 1 1
3 3 3
80 150 150
4700 4700 4700
- - -
6
12
262
3
5,1
14
1
3
150
4700
-