EVI High efficiency air to water heat pumps ductables with

CZT
High efficiency air to water heat pumps
ductables with E.V.I. compressors
A+
-20°C
CZT
+43°C
+65°C
E.V.I.
The CZT series of high efficiency heat pumps has been
specifically designed for use with radiant floor heating
systems or those applications where it is necessary to have
maximum efficiency when heating.
They have been optimized on heating mode, are able to
produce water up to 65°C and can operate down to -20°C
ambient temperature.
The units have been designed for internal installation in plant
rooms and are fitted with E.C. fans suitable for connection to
ductwork.
CZT units are available in 2 pipes, 2+2 pipes and 4 pipes
versions.
Some versions can produce domestic hot water, in the P2S
version through the activation of an external 3-way-valve and
in the P4S version by means of a separate heat exchanger
and hydraulic circuit for the domestic hot water.
All versions are supplied with reverse cycle valve used for
winter defrost; the HH version is suitable for use in those
countries that have support schemes for use of heat pump
technology for heating. The RV versions are also able to produce cold water. The HH heating only versions is factory set
and locked to operate only in heating mode whilst.
The noise is extremely low thanks to the use of a special
floating vibration damping system which allows a noise reduction of about 10-12 dB(A).
56
VERSIONS
HH
RV
XL
P2U
P2S
P4U
P4S
Heating only.
Reversible heating/cooling.
Super low noise.
2 pipe systems without domestic hot water production.
2 pipe systems with domestic hot water production by
external 3 way valve.
4 pipe systems heating/cooling.
2+2 pipe systems with domestic hot water production.
ACCESSORIES
DSSE
INSE
KAVG
RAES
KP
PCRL
VTEE
VECC
A1NT
A1ZZ
A2NT
A2ZZ
SGRS
SODP
Electronic soft starter.
Serial interface card RS 485.
Rubber anti-vibration mountings.
User and recovery heat exchanger antifreeze kit.
Hydraulic circuit antifreeze kit.
Remote control panel.
Electronic thermostatic valve.
High static pressure E.C. fans.
Hydraulic kit with one pump without tank.
Hydraulic kit with tank and one pump.
Hydraulic kit with two pump without tank.
Hydraulic kit with tank and two pump.
Cascade control system via RS485
Unit performance optimizer.
A+
252
302
452
502
602
752
Energy Class in low temperature - According to EU reg. 811/2013
A+
A+
A+
A+
A+
A+
Energy Class in high temperature - According to EU reg. 811/2013
A+
A+
A+
A+
A+
A+
(1)
kW
Heating capacity (EN14511)
25,7
32,2
43,1
54,9
63,0
72,8
kW
Total input power (EN14511)(1)
6,19
7,81
10,51
13,22
15,29
17,70
W/W
COP (EN14511) (1)
4,15
4,12
4,10
4,15
4,12
4,11
V/Ph/Hz 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N
Power supply
A
Max input current standard unit
20,9
24,6
34,9
40,5
45,5
55,7
A
Peak current standard unit
63,2
83,6
119,0
149,5
143,3
170,5
A
Peak current standard unit with soft starter (optional)
38,1
50,2
71,5
89,7
86,7
102,3
Max air flow in heating mode
m3/h
11000
11000
22000
22000
33000
33000
Nominal available static pressure (3)
Pa
50
50
50
50
50
50
Maximum available static pressure (5)
Pa
150
150
150
150
150
150
n°
1
1
2
2
3
3
Fans
Compressors / Circuits
n°/n°
2/1
2/1
2/1
2/1
2/1
2/1
Max sound power level in heating mode (3)
dB (A)
70
70
73
73
75
75
Max sound pressure level in heating mode (4)
dB (A)
42
42
45
45
47
47
CZT
(XL/HH) Super low noise - Heating only version
252
302
452
502
602
752
Energy Class in low temperature - According to EU reg. 811/2013
A+
A+
A+
A+
A+
A+
Energy Class in high temperature - According to EU reg. 811/2013
A+
A+
A+
A+
A+
A+
(1)
kW
Heating capacity (EN14511)
25,7
32,2
43,1
54,9
63,0
72,8
kW
Total input power (EN14511)(1)
6,19
7,81
10,51
13,22
15,29
17,70
W/W
COP (EN14511) (1)
4,15
4,12
4,10
4,15
4,12
4,11
(2)
kW
Cooling capacity (EN14511)
22,4
27,7
36,5
46,0
54,5
62,5
kW
Total input power (EN14511)(2)
7,64
9,71
13,27
17,03
18,47
21,25
W/W
EER (EN14511) (2)
2,93
2,85
2,75
2,70
2,95
2,94
V/Ph/Hz 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N 400/3/50+N
Power supply
A
Max input current standard unit
20,0
23,4
35,2
40,4
46,8
56,8
A
Peak current standard unit
62,3
82,5
120,2
149,8
143,8
170,8
A
Peak current standard unit with soft starter (optional)
38,1
50,2
71,5
89,7
86,7
102,3
Max air flow in heating mode
m3/h
11000
11000
22000
22000
33000
33000
Max air flow in cooling mode
m3/h
11000
11000
22000
22000
33000
33000
(3)
Nominal available static pressure
Pa
50
50
50
50
50
50
(5)
Maximum available static pressure
Pa
150
150
150
150
150
150
n°
1
1
2
2
3
3
Fans
Compressors / Circuits
n°/n°
2/1
2/1
2/1
2/1
2/1
2/1
Max sound power level in heating mode (3)
dB (A)
70
70
73
73
75
75
Max sound pressure level in heating mode (4)
dB (A)
42
42
45
45
47
47
Max sound power level in cooling mode (3)
dB (A)
70
70
73
73
75
75
Max sound pressure level in cooling mode (4)
dB (A)
42
42
45
45
47
47
(XL/RV) Super low noise - Reversible version
Performances are obtained with available static pressure 50 Pa, at the following conditions:
(1)Heating: Ambient temperature 7°C DB, 6°C WB, water temperature 30/35°C.
(2)Cooling: ambient temperature 35°C, water temperature 12/7°C (RV versions Only).
(3)Sound power level in accordance with ISO 9614, ducted unit, available static pressure 50 Pa.
(4)Sound pressure level at 10 mt from the unit in free field conditions direction factor Q=2, calculated in
accordance with ISO 9614, ducted unit, available static pressure 50 Pa.
(5) Available static pressure obtained with oversized electric motor, for the technical data in this working
condition please refer to the unit technical manual.
57
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CZT
FRAME
All CZT units are made from hot-galvanised
sheet steel, painted with polyurethane powder enamel and stoved at 180°C to provide
maximum protection against corrosion.
The frame is self-supporting with removable panels. All screws and rivets used are
made from stainless steel.
The standard colour of the units is RAL9018.
REFRIGERANT CIRCUIT
The refrigerant utilised is R410A. The refrigerant circuit is assembled using internationally recognised brand name components
with all brazing and welding being performed in accordance with ISO 97/23. The
refrigerant circuit includes: sight glass, filter
drier, two thermal expansion valves (one for
cooling mode, one for heating mode) with
external equalizer, 4 way reversing valve,
check valves, liquid receiver, Schrader
valves for maintenance and control, pressure safety device (for compliance with
PED regulations). The circuit also includes
an AISI316 stainless steel heat exchanger
that is used as an economizer plus an additional expansion valve for refrigerant vapour injection.
COMPRESSORS
Units use scroll compressors that are
equipped with E.V.I. technology, a versatile
method of improving system capacity and
efficiency. EVI stands for “Enhanced Vapour Injection.” The technology involves injecting refrigerant vapour into the middle of
the compression process, a procedure that
significantly boosts capacity and efficiency.
Each scroll compressor used in these units
is similar to a two-stage compressor with
built-in inter-stage cooling. The process begins when a portion of the condenser liquid
is extracted and expanded through an expansion valve. The low temperature liquid/
gas mixture produced is injected into a heat
exchanger that operates as a sub cooler.
Any liquid is evaporated and the vapour
produced is superheated.
The superheated vapour is then injected
into an intermediate port in the scroll compressor. This cold vapour reduces the
temperature of the compressed gas thus
enabling the compressor to raise the pressure to levels (and temperatures) beyond
that possible with a single stage scroll. The
additional sub cooling of the main volume
of liquid refrigerant increases the evapora-
tor capacity. This compressor technology
generates a larger pressure ratio between
condensing and evaporating pressures,
with significant performance improvement.
In all units the compressors are connected
in tandem. The compressors are all supplied with a crankcase heater and thermal
overload protection by a klixon embedded
in the motor winding. They are mounted in
a separate enclosure in order to be separated from the air stream thus enabling
them to be maintained even if the unit is
operating. Access to this enclosure is by
the front panel of the unit. The crankcase
heater is always powered when the compressor is in stand-by.
SOURCE HEAT EXCHANGER
The source heat exchanger is made from
3/8” copper pipes and 0,1mm thick aluminium fins with the tubes being mechanically
expanded into the aluminium fins in order
to maximise heat transfer. Furthermore, the
design guarantees a low air side pressure
drop thus enabling the use of low rotation
speed (and hence low noise) fans.
USER HEAT EXCHANGERS
The user heat exchanger is a braze welded,
plate type heat exchanger, manufactured
from AISI 316 stainless steel. The use of
this type of exchanger results in a massive
reduction of the refrigerant charge of the
unit compared to a traditional shell-in-tube
type. A further advantage is a reduction in
the overall dimensions of the unit.
The exchangers are factory insulated with
flexible close cell material and can be fitted with an antifreeze heater (accessory).
Each exchanger is fitted with a temperature
sensor on the discharge water side for antifreeze protection.
E.C. DUCTABLE FANS
Axial fans with High available Static Pressure, supplied with Brushless DC electric
motor electronically commutated (E.C. motors), directly coupled to the electric motor.
The fan wheel and the scroll are made from
hot galvanized thick sheet metal, painted
with polyurethane powders, to ensure the
best resistance against aggressive environments. The electric motor is a high efficiency DC brushless type with external rotor, to
guarantee an ideal cooling of the windings
and the absence of power lost due to pulleys and belt transmission. The fan is stati-
58
cally and dynamically balanced class 6,3
according to ISO1940. The electric motor
has a separate electronic commuter (driver)
and a speed modulation 0-10V, integrated
PFC, “burn out” thermal protection (in case
of considerable reduction of the power supply), protection degree IP54, serial interface
card with modbus protocol RTU.
MICROPROCESSORS
All CZT units are supplied as standard with
microprocessor controls. The microprocessor controls the following functions: control
of the water temperature, antifreeze protection, compressor timing, compressor
automatic starting sequence (For multiple
compressors), alarm reset. The control
panel is supplied with display showing all
operational icons. The microprocessor is
set for automatic defrost (when operating
in severe ambient conditions) and for summer/ winter change over.
The control also manages the anti-legionella program, the integration with other heating sources (electric heaters, boilers, solar
panels etc), the operation of a three port
modulating valve (for diverting to DHW or
heating) and both the heating circuit pump
and the domestic hot water circuit pump. If
required (available as an option), the microprocessor can be configured in order for it
to connect to a site BMS system thus enabling remote control and management. The
Hidros technical department can discuss
and evaluate, in conjunction with the customer, solutions using MODBUS protocols.
ELECTRIC ENCLOSURE
The enclosure is manufactured in order to
comply with the requirements of the electromagnetic compatibility standards CEE
73/23 and 89/336. Access to the enclosure
is achieved by removing the front panel
of the unit. The following components are
supplied as standard on all units: main
switch, a sequence relay that disables the
power supply in the event that the phase
sequence is incorrect (scroll compressors
can be damaged if they rotate in the wrong
direction), thermal overloads (protection of
pumps and fans), compressor fuses, control circuit automatic breakers, compressor
contactors, fan contactors and pump contactors. The terminal board has volt free
contacts for remote ON-OFF, Summer/
winter change over (heat pumps only) and
general alarm.
CONTROL AND PROTECTION DEVICES
All units are supplied with the following
controls and protections: user water return
temperature sensor, antifreeze protection
temperature sensor installed on users water output, domestic hot water supply and
return temperature sensors (only versions
SW6), high pressure manual reset, low
pressure automatic reset, compressor thermal protection, air fan, thermal protection,
pressure transducer (used to optimize the
defrost cycle and to adjust the fan speed
depending on ambient conditions), flow
switch. All units are also fitted with a temperature probe sensor with “Energy Saving”
function, supplied in a separate plastic box,
which can be used to stop the pump use
during periods of stand-by, when the water
temperature reaches the set point. Doing
this the power consumption of the unit is
strongly reduced. The probe sensor must
be positioned in the hydraulic compensa-
CZT
VERSIONS
tor present at the screening technique. The
domestic hot water circuit (only versions
P4S and P4U) is already equipped with this
probe, but it must be installed in the user
circuit.
HH heating only versions are available in
the P2U, P2S and P4S configuration only.
VERSION P2U
This is a two pipe version that can produce
hot water for heating (HH heating only) and
hot or cold water in the RV version. The RV
is used with two pipe water based changeover systems. It is not able to produce domestic hot water.
VERSION P2S
This is a two pipe version that can, in addition to producing hot water for heating
(HH version) and hot and cold water in the
RV version can also generate domestic hot
water. The controller has dual heating set
points (heating and DHW) and can also
control a three port diverting valve that directs the DHW to the cylinder. DHW production has priority irrespective of the mode
of operation of the unit. The unit is normally
used with two pipe water based changeover systems.
VERSION P4S
This is a four pipe version that can produce
hot water for heating (HH version), hot and
cold water for cooling and domestic hot
water (only RV versions) in all operational
modes using an independent water circuit.
When cooling, DHW generation is by heat
recovery. This unit is normally used with
two pipe water based change-over systems
with the DHW circuit being separate.
59
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-
+
NOISE REDUCTION
All CZT units are supplied, as standard,
with the latest ‘Floating Frame’ technology
that completely isolates the compressors
from the main casing, thereby eliminating
vibration and noise from this source. The
‘Floating Frame’ is a special vibration and
acoustic damping system that consists of
a base plate and acoustic enclosure that
houses the compressors. The base plate is
separated from the supporting frame of the
unit by soft steel springs that have a high
damping power. Within the enclosure, the
compressors are mounted on rubber shock
absorbers on the floating base plate. The
enclosure is manufactured from galvanized
steel sandwich panels that have a microperforated inner skin and a core of 50 mm
thick, high density (40 kg/m3) mineral wool.
The entire arrangement provides a double
damping system and acoustic attenuation.
The compressor refrigerant pipes are connected to the ‘fridge circuit via “anaconda”
flexible connections. Flexible connections
are also used on the water pipework within
the unit. The combination of these systems
results in an overall noise reduction in the
region of 10-12 dB(A).
OPERATION LIMITS (All versions)
70
Water temp. production (°C)
Water temp. production (°C)
CZT
VERSION P4U
This is a four pipe version that provides a
modern approach to four pipe water based
systems. Instead of using a boiler and chiller, this unit can generate hot water in one
circuit, cold water in the other circuit either
individually or simultaneously. When operating in simultaneous mode the heating capacity is equal to the cooling duty plus the
power input to the compressors. The operating efficiency in this mode is extremely
high. Domestic hot water production for this
version is not available.
60
50
40
30
20
30
OPERATION LIMITS (RV versions Only)
Heating mode
20
Cooling with head pressure control
10
Cooling with head pressure control
0
Cooling with head pressure control and glycol
-10
Cooling with head pressure control and glycol
-20
- 20
- 10
0
10
20
30
40
50
Ambient temperature (°C)
- 20
- 10
0
10
20
30
40
50
Ambient temperature (°C)
60
CZT options
Code
252
302
–
–
–
–
–
–
452
502
602
752
Flow switch
User water strainer
Evap/cond.press. control by transducer and fan speed control
DCCI
Fresh air temperature probe for set-point compensation
SOND
Specific software for operation priorities
Remote ON/OFF digital input
Summer/Winter digital input
Floating frame technology
BRCA
High static pressure E.C. fans
VECC
Cascade control system via RS485
SGRS
Unit performance optimizer
SODP
Hydraulic kit with one pump with tank - user circuit
A1ZZU
Hydraulic kit with two pumps with tank - user circuit
A2ZZU
Hydraulic kit with one pump without tank - user circuit
A1NTU
Hydraulic kit with two pumps without tank - user circuit
A2NTU
Hydraulic kit with one pump without tank - recovery circuit
A1NTR
Hydraulic kit with two pumps without tank - recovery circuit
CZT
Condensate discharge drip tray with antifreeze heater
A2NTR
User and recovery heat exchanger antifreeze kit
RAEV2/4
Rubber anti-vibration mountings
KAVG
Hydraulic circuit antifreeze kit
KP
Electronic Soft starter
DSSE
Remote control panel
PCRL
Serial interface card RS485 with MODBUS protocol
INSE
Electronic thermostatic valve
VTEE
Standard,
F1
F2
F3
C
C
B
Optional, – Not available.
C
B
B
A
A
A
Mod.
252/XL
302/XL
452/XL
502/XL
602/XL
752/XL
Frame Ventilatori A (mm) B (mm) C (mm)
F1
F1
F2
F2
F3
F3
1
1
2
2
3
3
1270
1270
1580
1580
1580
1580
61
1900
1900
2900
2900
3900
3900
880
880
1150
1150
1150
1150
Kg
550
560
750
775
970
1020
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