Frigicoll Kaysun KEM-90 DRS4 Product guide

IMPORTANT NOTE:
Thank you very much for purchasing our air conditioner,
Before using your air conditioner, please read this manual carefully and keep it for
future reference.
KEM-90 DRS4
ENGINEERING DATA BOOK
DC Inverter Air-cooled Modular Chiller

1
CONTENTS
Part 1 General Information.............................................................................3
Part 2 Engineering Data................................................................................11
Part 3 Installation and Field Settings...........................................................23
CONTENTS

2

3
Part 1 - General Information
Part 1
General Information
1 System introduction ....................................................................................4
2 Product Lineup.............................................................................................7
3 Unit Combinations.......................................................................................8
4 System Design And Unit Selection .............................................................9

4
1 System introduction
1.1 System Schematic
Aqua thermal is an integrated air-to-water space heating and space cooling heat pump system. The outdoor heat pump
system extracts heat from the outdoor air and transfers this heat through refrigerant piping to the plate heat exchanger in the
hydronic system. The heated water in the hydronic system circulates to low temperature heat emitters (floor heating loops or
low temperature radiators) to provide space heating. The 4-way valve in the outdoor unit can reverse the refrigerant cycle so
that the hydronic system can provide chilled water for cooling using fan coil units.
The heating capacity of heat pumps decreases with ambient temperature. Aqua thermal is reserved an auxiliary electric heater
control port to provide additional heating capacity for use during extremely cold weather when the heat pump capacity is
insufficient. The auxiliary electric heater also serves as a backup in case of heat pump malfunction and for anti-freeze protection
of the outside water piping in winter.
1.2 Typical Applications
1.2.1 Space Heating Through Floor Heating Loops
Master unit
Expansion tank
Water replenishment valve
Water discharge valve
Floor
Heating
Loops
Floor
Heating
Loops
Floor
Heating
Loops
Differential pressure
by-pass valve
Drain valveTwo-way valves
Auxiliary electric heater
unit
unit
Y-type filter,
requiring≥ 16 mesh
Slave unit
Max 16 units
Stop valvePressure gauge Gate valveFlexible joint
Y-shaped filter ThermometerCirculating pump Check valve
Automatic discharge valve
Legend

5
Part 1 - General Information
1.2.2 Space Cooling And Heating Through Fan Coil Unit
Master unit
Expansion tank
Water replenishment valve
Water discharge valve
Differential pressure
by-pass valve
Drain valve
Two-way valve
Three-way valve
FCU
Auxiliary electric heater
unit
unit
Y-type filter,
requiring≥ 16 mesh
Slave unit
Max 16 units
FCU
FCU
Stop valvePressure gauge Gate valveFlexible joint
Y-shaped filter ThermometerCirculating pump Check valve
Automatic discharge valve
Legend

6
1.2.3 Space Heating Through Floor Heating Loops and Space Cooling Through Fan Coil Unit
Note: In space cooling mode, the 2-way valve on the floor heating branch circuit is closed to prevent cold water entering the
floor heating loops.
Master unit
Expansion tank
Water replenishment valve
Water discharge valve
Differential pressure
by-pass valve
Drain valve
Two-way valve
Three-way valve
FCU
Auxiliary electric heater
unit
unit
Y-type filter,
requiring≥ 16 mesh
Slave unit
Max 16 units
FCU
FCU
Floor
Heating
Loops
Floor
Heating
Loops
Floor
Heating
Loops
Two-way valves
Stop valvePressure gauge Gate valveFlexible joint
Y-shaped filter ThermometerCirculating pump Check valve
Automatic discharge valve
Legend

7
Part 1 - General Information
2 Product lineup
Model KEM-90 DRS4
Power supply 380-415V/3Ph/50Hz
Appearance

8
3 Unit Combinations
System Capacity (kW) Numbers of units Modules
90 1 ●
180 2 ●●
270 3 ●●●
360 4 ●●●●
450 5 ●●●●●
540 6 ●●●●●●
630 7 ●●●●●●●
720 8 ●●●●●●●●
810 9 ●●●●●●●●●
900 10 ●●●●●●●●●●
990 11 ●●●●●●●●●●●
1080 12 ●●●●●●●●●●●●
1170 13 ●●●●●●●●●●●●●
1260 14 ●●●●●●●●●●●●●●
1350 15 ●●●●●●●●●●●●●●●
1440 16 ●●●●●●●●●●●●●●●●

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Part 1 - General Information
4 System Design And Unit Selection
4.1 Selection Procedure
Step 1: Total heat load calculation
Step 2: System configuration
Step 1: Total heat load calculation
Calculate conditioned surface area
Select the heat emitters (type, quantity, water temperature and heat load)
Decide whether to enable or disable auxiliary electric heater
Determine required total heat load on outdoor units
Set capacity safety factor
Select power supply
Provisionally select Aqua thermal Series unit capacity1 based on nominal
capacity
Correct capacity of the outdoor units for the following items:
Outdoor air temperature / Outdoor humidity / Water outlet temperature2 /
Altitude / Anti-freeze type
Is corrected Aqua thermal capacity ≥ Required total heat load on outdoor
units3
Aqua thermal system
selection is complete
Yes No
Notes:
1. Up to 16 units can be connected together, giving a system cooling/heating capacity range from 90kW to 1440kW.
2. If the required water temperatures of the heat emitters are not all the same, the Aqua thermal’s outlet water temperature setting should be set at the
highest of the heat emitter required water temperatures. If the water outlet design temperature falls between two temperatures listed in the outdoor
unit's capacity table, calculate the corrected capacity by interpolation.
3. Select Aqua thermal which satisfies both total heating and cooling load requirements.

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4.2 Modular Chiller Leaving Water Temperature (LWT) Selection
The recommended design LTW ranges for different types of heat emitter are:
For floor heating: 30 to 35⁰C
For fan coil units: 30 to 45⁰C
For low temperature radiators: 40 to 50⁰C
5.3 Optimizing System Design
To get the most comfort with the lowest energy consumption with Aqua thermal, it is important to take account of the
following considerations:
Choose heat emitters that allow the heat pump system to operate at as low a hot water temperature as possible whilst still
providing sufficient heating.

11
Part 2 - Engineering Data
Part 2
Engineering Data
1 Specifications..............................................................................................12
2 Dimensions And Center of Gravity............................................................13
3 Operating Limits.........................................................................................14
4 Capacity Tables ...........................................................................................15
5 Performance Adjustment Factors .............................................................17
6 Hydronic Performance ...............................................................................19
7 Octave Band Levels.....................................................................................20

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1 Specifications
Model name KEM-90 DRS4
Power supply V/Ph/Hz 380~415/3/50
Cooling1
Capacity kW 82
Rated input kW 27.8
EER 2.95
Heating2Capacity kW 90
Rated input kW 28.1
COP 3.2
Seasonal space heating energy efficiency class (LWT at 35⁰C) A++
Max. running current A 60
Air side heat exchanger
Type Finned tube
Fan motor type DC motor
Fan motor rated input W 920
Fan motor quantity 2
Air flow rate m3/h 35000
Water side heat exchanger
Type Plate
Volume L 7.05
Rated water flow m3/h 15
Water flow range m3/h 10.2 ~ 18
Water pressure drop kPa 75
Refrigerant system
Refrigerant type R32
Refrigerant charge3 kg 16 (11.5+4.5)
Throttle type EXV
Sound power level4 dB 86
Sound pressure level(1m)5 dB(A) 65
Net dimensions (W×H×D) mm 2220*2315*1135
Packed dimensions (W×H×D) mm 2250*2445*1180
Net/Gross weight kg 635/660
Water pipe connections mm DN50
Water pressure range MPa 0.05 ~ 1.0
Water flow switch Action flow m3/h 10 ± 10%
Vent Valve Max working pressure Mpa 1.0
Safety valve Action pressure Mpa 0.6 ± 10%
Controller KCCHT-05 MODBUS
Operating temperature range Cooling °C -10 to 48
Heating °C -20 to 43
Water outlet temperature
range
Cooling4°C 5 to 20
Heating °C 25 to 54
Notes:
1. Outdoor ambient temperature 35°C DB. EWT 12°C, LWT 7°C;
2. Outdoor ambient temperature 7°C DB/6°C WB. EWT 40°C, LWT 45°C;
3. The total amount of refrigerant is 16kg, including the 11.5 kg already charged before delivery and the 4.5 kg to be charged.
For refrigerant charging operation guidance, please refer to OWNER'S & INSTALLATION MANUAL.
4. Test standard: EN12102-1. Outdoor ambient temperature 35°C DB. EWT 12°C, LWT 7°C
Notes continued on next page …

13
Part 2 - Engineering Data
Notes continued
5. Outdoor ambient temperature 35°C DB. EWT 12°C, LWT 7°C
Sound pressure level is the test average measured in a semi-anechoic chamber. The test position is 1m right in front of the unit
for four sides and (1+H)/2m (where H is the height of the unit) above the floor. During in-situ operation, sound pressure levels
may be higher as a result of ambient noise.
6. Capacity and efficiency data calculated in accordance with EN14511; EN14825
7. Seasonal space heating energy efficiency class tested in average climate conditions.
2 Dimensions and Center of Gravity
Electric control box
1000
(H+1000)/2
Unit
H
Test
p
osion
Electric control box

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3 Operating Limits
3.1 Cooling operating range
Notes:
Normal mode
Low leaving water temperature mode
Low leaving water temperature mode can be set through wired controller, please refer to the Operation Manual for
details. If low leaving water temperature function is effective, the operation range will extend to the red frame above.
When the set temperature is less than 5°C, antifreeze liquid (concentration above 15%) should be added in the water
system, otherwise the unit will be damaged.
3.2 Heating operating range
ķ
ĸ
ĸ

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Part 2 - Engineering Data
4 Capacity Tables
4.1 Heating Capacity Tables
DB
LWT
30 35 40 45 50 54
TC PI COP TC PI COP TC PI COP TC PI COP TC PI COP TC PI COP
-20 43.9 21.7 2.0 42.7 24.8 1.7 39.7 26.6 1.5 - - - - - - - -
-15 55.8 23.4 2.4 53.6 25.9 2.1 51.0 27.6 1.8 45.8 26.9 1.7 - - - - - -
-7 72.4 24.2 3.0 70.2 26.2 2.7 68.0 28.6 2.4 64.1 30.6 2.1 48.0 28.0 1.7 - - -
2 88.3 26.6 3.3 86.3 26.4 3.3 84.9 28.8 2.9 81.5 31.3 2.6 70.0 32.1 2.2 59.9 33.3 1.8
7 98.3 22.7 4.3 95.4 24.1 4.0 92.7 27.0 3.4 90.5 28.1 3.2 83.3 34.4 2.4 71.0 34.0 2.1
15 102.9 23.7 4.3 100.4 24.9 4.0 99.1 25.8 3.8 97.7 28.2 3.5 84.7 27.2 3.1 73.9 27.0 2.7
20 103.0 22.3 4.6 100.3 23.5 4.3 99.6 24.9 4.0 98.0 25.0 3.9 79.1 22.2 3.6 70.2 21.2 3.3
25 101.9 20.5 5.0 100.2 19.7 5.1 99.3 20.3 4.9 96.8 22.0 4.4 69.6 20.7 3.4 58.9 15.7 3.8
30 99.2 18.1 5.6 96.0 18.3 5.2 94.6 18.7 5.1 84.9 18.8 4.5 63.0 17.1 3.7 47.0 14.4 3.3
35 92.8 15.4 6.0 89.0 16.7 5.3 85.0 16.0 5.3 76.8 16.2 4.7 - - - - - -
40 88.9 14.0 6.3 80.0 13.3 6.0 71.4 11.4 6.3 66.0 12.4 5.3 - - - - - -
43 88.0 13.8 6.4 78.6 12.4 6.4 70.1 10.7 6.5 64.3 12.2 5.3 - - - - - -
Abbreviations:
LWT: Leaving water temperature (°C )
DB: Dry-bulb temperature for outdoor air temperature (°C )
HC: Total heating capacity (kW)
PI: Power input (kW)
Notes:
Performance specifications measured with water pump operating at rated water flow rate.

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4.2 Cooling Capacity Tables
DB
LWT
5 7 10 13 15 20
CC PI EER CC PI EER CC PI EER CC PI EER CC PI EER CC PI EER
-15 - - - - - - 75.1 13.3 5.6 80.3 13.6 5.9 83.8 13.8 6.1 92.5 14.2 6.5
-10 - - - - - - 75.8 18.6 4.1 80.8 17.2 4.7 84.0 16.4 5.1 92.3 14.2 6.5
-5 - - - - - - 75.9 16.0 4.8 80.8 16.1 5.0 84.1 16.2 5.2 92.3 16.4 5.6
0 - - - - - - 76.6 15.2 5.0 81.0 16.2 5.0 84.0 16.9 5.0 91.3 18.6 4.9
5 - - - - - - 75.8 17.4 4.4 81.3 14.4 5.6 84.1 14.8 5.7 91.1 14.6 6.2
9 - - - - - - 79.1 16.6 4.8 82.5 14.2 5.8 86.4 14.8 5.9 93.0 14.8 6.3
11 93.4 27.3 3.4 98.7 31.4 3.1 105.2 28.0 3.8 114.4 29.7 3.8 122.7 26.1 4.7 128.2 26.8 4.8
15 93.1 27.3 3.4 98.8 27.4 3.6 111.7 29.5 3.8 120.5 27.4 4.4 127.2 28.1 4.5 133.9 28.7 4.7
20 91.8 28.7 3.2 97.8 31.1 3.1 107.6 31.5 3.4 113.5 31.8 3.6 117.3 29.3 4.0 127.1 29.4 4.3
25 90.3 27.8 3.2 96.2 22.5 4.3 102.9 27.5 3.7 109.0 25.9 4.2 111.7 25.6 4.4 121.3 23.5 5.2
30 87.4 29.5 3.0 92.1 30.0 3.1 99.9 30.3 3.3 106.1 29.8 3.6 108.3 25.2 4.3 117.3 24.7 4.7
35 80.9 32.2 2.5 84.8 28.3 3.0 93.7 33.0 2.8 100.8 32.0 3.2 104.2 28.4 3.7 112.4 27.5 4.1
40 69.9 30.2 2.3 73.8 26.9 2.7 81.6 27.7 3.0 87.1 27.5 3.2 92.6 28.0 3.3 102.3 27.9 3.7
43 60.9 28.2 2.2 65.8 25.1 2.6 72.2 24.2 3.0 77.7 23.8 3.3 81.8 24.0 3.4 92.1 25.3 3.6
45 48.5 24.2 2.0 57.8 22.7 2.6 62.9 22.4 2.8 67.5 23.0 2.9 72.8 23.4 3.1 80.7 22.2 3.6
48 29.3 16.5 1.8 39.3 18.7 2.1 45.1 19.2 2.4 51.0 17.6 2.9 55.0 17.8 3.1 60.9 19.3 3.1
50 15.2 12.1 1.3 17.2 12.3 1.4 19.6 12.4 1.6 23.6 12.3 1.9 26.0 12.5 2.1 33.0 12.2 2.7
Abbreviations:
LWT: Leaving water temperature (°C )
DB: Dry-bulb temperature for outdoor air temperature (°C )
CC: Total cooling capacity (kW)
PI: Power input (kW)
Notes:
Performance specifications measured with water pump operating at rated water flow rate.

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Part 2 - Engineering Data
5 Performance adjustment factors
5.1 Ethylene and Propylene Glycol factors
The antifreeze must be required according to anyone condition as following:
The ambient temperature is below 0 ⁰C;
Don’t start up the unit for a long time.
The power supply was cut off and needn’t change the water in system.
A glycol solution is required when the unit with condition as mentioned. The use of glycol will reduce the performance of the
unit depending on concentration.
Concentration of
ethylene glycol (%)
Modification coefficient Freezing point (°C)
Cooling capacity Power input Water resistance Water flow
0 1.000 1.000 1.000 1.000 0
10 0.984 0.998 1.118 1.019 -4
20 0.973 0.995 1.268 1.051 -9
30 0.965 0.992 1.482 1.092 -16
40 0.960 0.989 1.791 1.145 -23
50 0.950 0.983 2.100 1.200 -37
Concentration of
propylene glycol
(%)
Modification coefficient
Freezing point (°C)
Cooling capacity Power input Water resistance Water flow
0 1.000 1.000 1.000 1.000 0
10 0.976 0.996 1.071 1.00 -3
20 0.961 0.992 1.189 1.016 -7
30 0.948 0.988 1.380 1.034 -13
40 0.938 0.984 1.728 1.078 -22
50 0.925 0.975 2.150 1.125 -35
5.2 Evaporator temperature drop factors
Performance tables are based on a 5⁰C temperature drop through the evaporator. Adjustment factors for applications with
temperature ranges from 3⁰C to 6⁰C in follow table. Temperature drops outside this range can affect the control system’s
capability to maintain acceptable control and are not recommended.
5.3 Altitude correction factors
Performance tables are based at sea level. Elevations other than sea level affect the performance of the unit. The decreased air
density will reduce condenser capacity and reduce the unit’s performance. Maximum allowable altitude is 1800meters.
5.4 Fouling factor
Fouling refers to the accumulation of unwanted material on solid surfaces, most often in an aquatic environment. The fouling
material can consist of either living organisms (biofouling) or a non-living substance (inorganic or organic). Fouling is usually
distinguished from other surface-growth phenomena in that it occurs on a surface of a component, system or plant performing
a defined and useful function, and that the fouling process impedes or interferes with this function.

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Other terms used in the literature to describe fouling include: deposit formation, encrustation, crudding, deposition, scaling,
scale formation, slagging, and sludge formation. The last six terms have a more narrow meaning than fouling within the scope
of the fouling science and technology, and they also have meanings outside of this scope; therefore, they should be used with
caution.
Fouling phenomena are common and diverse, ranging from fouling of ship hulls, natural surfaces in the marine environment
(marine fouling), fouling of heat-transfer components through ingredients contained in the cooling water or gases, and even
the development of plaque or calculus on teeth, or deposits on solar panels on Mars, among other examples.
Foreign matter in the chilled water system will adversely affect the heat transfer capability of the evaporator, and could increase
the pressure drop and reduce the water flow. To provide optimum unit operation, proper water treatment must be maintained.
Refer to the able as following.
ALTITUDE
(m)
Difference
of water
inlet and
outlet
temp. (⁰C)
Fouling Factor
0.018 m2. ⁰C /kW 0.044 m2. ⁰C /kW 0.086 m2. ⁰C /kW 0.172 m2. ⁰C /kW
C P C P C P C P
Sea level
3 1.036 1.077 1.019 1.076 0.991 0.975 0.963 0.983
4 1.039 1.101 1.022 1.080 0.994 0.996 0.971 0.984
5 1.045 1.105 1.028 1.086 1.000 1.000 0.977 0.989
6 1.051 1.109 1.034 1.093 1.006 1.004 0.983 0.994
600
3 1.024 1.087 1.008 1.064 0.980 0.984 0.951 0.991
4 1.027 1.111 1.011 1.068 0.983 1.005 0.959 0.992
5 1.034 1.115 1.017 1.074 0.989 1.009 0.965 0.997
6 1.043 1.115 1.026 1.084 0.998 1.009 0.973 0.999
1200
3 1.013 1.117 0.996 1.052 0.969 1.011 0.942 1.002
4 1.015 1.118 0.998 1.055 0.971 1.012 0.948 1.003
5 1.023 1.122 1.006 1.063 0.979 1.015 0.955 1.005
6 1.031 1.125 1.015 1.072 0.987 1.018 0.962 1.007
1800
3 1.002 1.128 0.986 1.042 0.959 1.021 0.935 1.007
4 1.005 1.129 0.989 1.045 0.962 1.022 0.941 1.010
5 1.012 1.132 0.995 1.051 0.968 1.024 0.945 1.012
6 1.018 1.134 1.001 1.058 0.974 1.026 0.949 1.014
Abbreviations:
C: Cooling capacity
P: Power input

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Part 2 - Engineering Data
6 Hydronic Performance
0
20
40
60
80
100
120
140
160
180
0510 15 20 25 30
Water pressure drop (kPa)
Water flow rate (m3/h)