MAXA R407C User manual
MODULAR AIR COOLED LIQUID CHILLERS AND HEATPUMPS
WITH AXIAL FANS AND SCROLL COMPRESSORS FROM 30 kW
TO 520 kW.
AIR CONDITIONING
R407C
A21
TECHNICAL MANUAL
Serie/Series/Serie/Série Emissione/Edition/Au-
sgabeIssue
CD 30÷520 05.07
Catalogo/Catalogue/Katalog/Brochure Sostituisce/Superseedes
Ersetzt/Remplace
MTE0112560020
02.07
CD 30 ÷ 520
2
CD 30 ÷ 520
3
CONTENTS
Modular Air-cooled Chiller System
1- Modular air-cooled Chiller System
1. Summarization ..........................................................................5
2. Nomenclature ............................................................................6
3. Outlook view..............................................................................6
4. System principle figure ..............................................................7
5. Specification ..............................................................................11
6. Sound pressure level.................................................................15
7. Digital scroll compressor ...........................................................19
8. The capacity control of the new modular chiller.........................21
9. Advantages of digital scroll compressor ....................................23
10. Features ....................................................................................30
11. Unit installation ..........................................................................32
12. Water system installation...........................................................35
13. Debugging .................................................................................39
14. Maintenance..............................................................................43
15. Troubles and solutions...............................................................46
16. Wiring diagram (main unit) ........................................................47
17. Wiring diagram (auxiliary unit) ...................................................49
18. Wiring & communication diagram..............................................50
19. Installation system figure ...........................................................51
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4
2- Electric control
1. Outlook view .............................................................................51
2. parts descriptions......................................................................52
3. Failure & protections codes ......................................................57
3- Wire controller
1. Outlook view .............................................................................59
2. Pattern & buttons description....................................................60
3. Basic operating conditions ........................................................62
4. Function description..................................................................63
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5
Air-cooled heat-pump module unit
1.Summarization
Maxa Commercial Digital scroll air-cooled heat-pump module unit is designed and produced on
the basement of sufficiently absorbing the top technology in AC areas, adopting self-control
components with high quality made by world famous producers. Moreover, after optimizing, unit can
run more efficiently and more stably. One 60kW module consists of two 30kW units, and several
modules can be formed into a digital scroll air-cooled heat-pump module unit by connecting each
module’s inlet & outlet pipeline in series. The whole unit consists of 1-8 modules (or 2-16 units) and
the max capacity is 480kW(520kW).
Maxa Commercial Digital scroll air-cooled heat-pump module unit can be used widely in civil
construction of AC engineering and industrial engineering, such as hotel, villa, restaurant, hospital,
factory, etc. It is a wise choice for areas where water is insufficient or there are strict limits on noise
level and surroundings.
Relevant noun description:
Unitüüone independent outdoor unit, including two entire refrigeration system and one
electric controller.
Main controller üüevery electric control system of unit can accomplish the following functions
independently: Mode input; Data collection; Output interface control; Failure alarm analyzing.
Digital scroll air-cooled heat-pump module unitüüa unit consists of one or more(1÷8) than one
modules (2÷16 units).
Wire Controllerüüthe interface between the module and human, it can receive the operation
command and sent them to main controller, meanwhile receive the running state data and
display them.
CD 30 ÷ 520
6
2. Nomenclature
3. View of 30kW module (composed by just one basic unit)
Cooling capacity (kw)
A: Auxiliary unit
M: Main unit
Digital
Chiller
C D – M 30
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7
View of 65kW module (composed by two basic unit)
4. Principle of system
Basic unit “Main and Auxiliary” from 30kW of cooling capacity is equipped with two independent
refrigerant circuits, with two compressors (1 digital, 1 fixed), just one plate heat exchanger and just
one control main board.
Basic unit “Main” from 65kw is the melt of two basic units of 30kW, so it is composed by 4
independent refrigerant circuits, 4 compressors (1 digital, 3 fixed), 2 plate heat exchanger and 2
control main boards.
Basic unit “Auxiliary” from 65kw is the melt of two basic units of 30kW, so it is composed by 4
independent refrigerant circuits, 4 fixed compressors, 2 plate heat exchanger and 2 control main
boards.
CD 30 ÷ 520
8
Numbers of modules can be assembled together into a large unit by connecting each own inlet &
outlet pipeline in series; can be connected together modules from 30kW and from 65kW of cooling
capacity until 16 units and 520kW of cooling capacity; here below you can see the connection
principle:
Two modules 30kW connected in series
CD 30 ÷ 520
9
Two modules 65kW connected in series
Two modules, one of 65kW and one of 30kW connected in series
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To correctly operate the unit and ensure normal and safe running when the outdoor Temp is
under 0°C in winter, the following should be noticed:
If the unit will not be used for a long time, please drain water away to prevent the plate heat-
exchanger from freezing.
If it is used frequently, it is absolutely forbidden to switch off the power, because the unit has
auto anti-freeze function. Moreover, in order to protect the plate heat-exchanger from freezing
in case the unit stops at night, and it must add some anti-freeze mixture to water system such
as glycol or propylene glycol.
Water flow switch should be installed correctly; otherwise, the unit may be damaged. What’s
more, the water flow switch should be Queryed periodically if it is work normally.
If malfunctions occur, it is absolutely forbidden to turn on the unit before the problems are
solved. At the same time, please drain water away to prevent the plate heat-exchanger from
freezing.
Table of contents
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