Contents Of Water Circuit - Hitecsa ADVANCE EQP1X Mode D'emploi

Pump installation
○ The units are equipped with a circulating pump, expansion tank and
safety valve.
Tank & Pump installation
○ The units are equipped with an inertial water buffer tank, circulating
pump, expansion tank with membrane, drain cock and safety valve.
Once the connections to the unit are made, check that none of the
pipes leak, and bleed the air from the system.
II.5.2

CONTENTS OF WATER CIRCUIT

II.5.2.1 Minimum water circuit content TCAEY-
THAEY
II.5.2.2 Minimum water circuit content EQP1X
To ensure the good working order of the EXP
systems, the correct water volumes must be guaranteed in the primary
and secondary circuits in relation to the type of system in which the unit
will be installed.
4-pipe systems
The following specific capacities are considered for this type of system.
Range Adjustment type
EQP1X 117÷130
AdaptiveFunction
Primary circuit
EQP1X 117÷130
Proportional
Secondary circuit
Example: EQP1X 124
The reference capacity to be taken into consideration when calculating
the water content on the primary circuit, is the cooling capacity in design
conditions during AUTOMATIC 1
Supposing that the design condition is the nominal condition (Qf=23.64
kW), a certain volume of water must be guaranteed in the primary
circuit, calculated as follows:
Qf (kW) x 4 (l/kW) = 23.64 kW x 4 (l/kW) = 94.56 l
The calculation of the minimum water content in the secondary circuit
must refer to the heating capacity obtained from the design conditions
AUTOMATIC 2
during operation. Supposing that the design condition
coincides with the nominal capacity (Qt=30.35 kW), the minimum
capacity of the secondary circuit should be:
Qt (kW) x 10 (l/kW) = 30.35 kW x 10 (l/kW) = 300.35 l
For design conditions that differ from the nominal conditions, the power
data must be found using Tables "D", which provide a clear list of the
power values that can be obtained at conditions other than nominal
conditions. When doing the calculation, we recommend always referring
to the maximum envisaged power.
IOM_EQP1X_117a133_208094_200901_ES-EN-FR-DE-IT
multipurpose
SYSTEMS
Specific
Control
capacity
4 l/kW
PGD
10 l/kW
operation.
SECTION II: INSTALLATION AND MAINTENANCE
2-pipe system and hot water buffer tank
In this type of system, the machine is connected to the primary water
circuit with the main exchanger, while the secondary exchanger is
connected to the circuit for heating the hot water, as illustrated in the
figure on page 37.
To calculate the minimum water content on the primary side, refer to the
previous case relative to the 4-pipe system.
To calculate the minimum water content on the secondary side
connected to the hot water tank, the following must be taken into
account. The hot water temperature may be influenced, especially in
the winter, by the machine's natural defrosting cycles. In fact, during the
defrosting phase, the machine operates with an inverted cycle,
transferring a cooling capacity to the water that inevitably cools it down.
The change in hot water temperature may affect performance if the
water content in the secondary exchanger water circuit is insufficient.
The figure provides a general illustration of the secondary circuit, which
highlights the circuit's user side boiler SS and the inertial water buffer
tank SI.
MA VSA
VE
US
SS
MA VSA
RS
Key:
ECH REC: recovery exchanger
PDR: recovery differential pressure switch
PU: secondary circuit user pump
VE: expansion vessel
VSAC: water safety valve
VSA: automatic bleed valve
MA: pressure gauge
SI: secondary circuit inertial tank
SS: hot water tank
RS: hot water restoration
US: hot water user
Having assigned the permitted change in temperature, it is possible to
calculate the minimum specific capacity.
The following table gives the minimum specific capacity values in l/kW
for the secondary circuit, based on the hot water temperature change.
It is therefore possible to calculate the capacity of the tank SI, once
the installed power is known.
Hot water temperature change dtu
Specific capacity
Application example
A system with a maximum installed recovering heating capacity of
Qt 30 kW. A maximum permitted hot water change of dt
installed=
The secondary circuit capacity is calculated as follows:
Qt (kW) x 18 l/kW = 30 kW x 18 l/kW = 540 l
installed
The secondary circuit water content must be at least 540 l. Overlooking
the water content in the pipes, the case in question requires a tank SI
(see figure) with a capacity of at least 540 l. In practice, we recommend
never exceeding dtu=6K and always considering the maximum
foreseeable power.
53
VSAC
PDR
PU
SI
K 4 5
l/kW 22 18 15
ECH
REC
6 7 8
13 12
=5K.
u