Marstair CX Series User manual

55908014-23
CX(E) SPLIT SYSTEMS
TECHNICAL MANUAL
CX(E) LOW TEPERATURE SPLIT SYSTEMS

2/20
55908014-23
INDEX
CONTENTS
PAGE
PART NUMBERS, UNIT COMBINATIONS, OPTIONS
3
DIMENSIONS & WEIGHTS, PERFORMANCE DATA
4
AIR FLOW, SOUND POWER AND SOUND PRESSURE LEVELS
5
ELECTRICAL DATA
6
CX(E) DIMENSIONS
7
INSTALLATION
8
CKC PIPEWORK
8
CKC REFRIGERANT
10
ELECTRICAL: CONNECTIONS & FUSES
12
CX MATCHES
12
WIRING DIAGRAMS
13
CX(E) CONTROLS
15
CKC INSTALLATION: DIMENSIONS
16
COMPONENT IDENTIFICATION
CX(E) UNITS
18
CKC UNITS
19
COMMISSIONING CHECK LIST
20
1. TEV Ltd recommend that personnel working on this equipment be skilled and fully conversant with
the appropriate Air Conditioning, Refrigeration and Electrical practices and have sound knowledge
of current Industrial Safe Working practices.
2. CX(E) models are electromechanical / Electronic control units that use R407C refrigerant; they
provide cooling within the range of 2.8 –8.5 kW. These units are matched with CKC outdoor units
to complete a system.
3. CX(E) units are fitted with an expansion assembly, allowing the use of a liquid line. This can be
transferred to the outdoor unit (CKC only), when an expansion line is required to accommodate
longer pipe runs.
4. These units contain live electrical components, moving parts and refrigerant under pressure.
Always site out of reach of children and protect from vandalism.
5. The data plate only gives information for the CX(E) unit. For system details add input power and
current of indoor and outdoor unit, including any heater load.
GENERAL

3/20
55908014-23
MODEL
CKC 20
1ph
CKC 30
1ph
CKC 50
1ph
CKC 80
1ph
CKC 80
3ph
CKC 90
1ph
CKC 90
3ph
PART NUMBER
55050720
55050730
55050722
55050723
55050724
55050771
55050778
Low Temperature Match
MODEL
CXE 40
CXE 50
CXE 70
CXE90
PART NUMBER
55917016
55917015
55917014
55917019
MODEL
CKC 20
1ph
CKC 40
1ph
CKC 60
1ph
CKC80
1ph
PART NUMBER
55020720
55020741
55020740
55050724
Above 8°C System Matches
Above 4°C System Matches
INDOOR UNIT
OUTDOOR UNIT
CXE 40
CKC 20
CXE 50
CKC 40
CXE 70
CKC 60
CXE 90
CKC 80
OPTIONAL KITS
PART
NUMBER
DESCRIPTION
55900700
3kW heater (CX only)
55900701
Digital temperature display (CX only) std on CXE
55900702
De-ice thermostat (CX only)
55900709*
Extended pipe run CX 30/40/50 only
55900710*
Extended pipe run CX 70/90 only
55900715
3kW heater (CXE only)
* When matched with CKC outdoor unit
MODEL
CX 30
CX 40
CX 50
CX 70
CX 90
PART NUMBER
55917001
55917002
55917003
55917004
55917005
MODEL
CXE 30
CXE 40
CXE 50
CXE 70
CXE 90
PART NUMBER
55917017
55917016
55917015
55917014
55917019
INDOOR UNIT
OUTDOOR UNIT
CX(E) 30
CKC 20
CX(E) 40
CKC 30
CX(E) 50
CKC 50
CX(E) 70
CKC 80
CX(E) 90
CKC90
CX(E) OPTIONS
UNIT COMBINATIONS
PART NUMBERS

4/20
55908014-23
Above 8°C System Matches
Above 4°C System Matches
Qualification of Cellar sizing
· Based on standard Cellar Construction
· Maximum product load 16 l/m³
· Product cooling time 24 hours (Nominal plant running time 18 hours)
· Product entering room 25°C
MODEL
CX(E) HEIGHT WIDTH DEPTH WEIGHT HEIGHT WIDTH DEPTH WEIGHT
30 483 845 320 18 530 950 370 21
40 483 845 320 18 530 950 370 21
50 483 845 320 20 530 950 370 23
70 483 845 320 23 530 950 370 26
90 483 845 320 25 530 950 370 28
MODEL
1Ph 3Ph 1Ph 3Ph
20 620 900 310 46 -620 980 340 48 -
30 620 900 310 48 -620 980 340 55 -
50 720 1000 350 64 -730 1090 390 66 -
60 720 1000 350 64 -730 1090 390 66 -
80 720 1000 350 66 64 730 1090 390 68 66
90 820 1000 350 76 73 820 1090 390 78 75
WIDTH
DEPTH
UNPACKED
PACKED
WEIGHT
WEIGHT
UNPACKED
PACKED
CKC
HEIGHT
WIDTH
DEPTH
HEIGHT
PERFORMANCE DATA (kW)
DIMENSIONS & WEIGHTS
Total Sensible Total Sensible Total Sensible
kW kW kW kW kW kW
40 20 2.1 1.6 0.76 1.9 1.45 0.76 1.8 1.38 0.77
50 40 3.3 2.46 0.75 3.1 2.32 0.75 3 2.25 0.75
70 60 5 3.53 0.71 4.7 3.33 0.71 4.5 3.2 0.71
90 80 5.9 4 0.68 5.7 3.9 0.68 5.5 3.8 0.69
5/3 & 35
CX
CKC
SHR
SHR
SHR
5/3 & 27
5/3 & 32
Above Below Above Below Above Below
kW kW m³ m³ kW kW m³ m³ kW kW m³ m³
30 20 2.8 1.88 31 52 0.67 2.7 1.81 29 49 0.67 2.6 1.74 28 47 0.67
40 30 3.6 2.27 44 72 0.63 3.3 2.12 39 64 0.64 3.1 2.02 36 59 0.65
50 50 5.2 3.23 71 114 0.62 5 3.12 67 109 0.62 4.8 3.02 64 104 0.63
70 80 7.2 4.35 108 169 0.60 6.9 4.2 102 161 0.61 6.6 4.05 96 152 0.61
90 90 8.5 5.04 133 206 0.59 8.2 4.85 127 197 0.59 8 4.68 123 192 0.59
Above Below Above Below Above Below
kW kW m³ m³ kW kW m³ m³ kW kW m³ m³
30 20 2.45 1.6 22 36 0.65 2.3 1.52 20 34 0.66 2.2 1.47 19 33 0.67
40 30 3 1.95 30 51 0.65 2.8 1.83 27 45 0.65 2.6 1.728 25 42 0.66
50 50 4.4 2.78 49 80 0.63 4.2 2.69 47 76 0.64 4 2.6 45 73 0.65
70 80 6.1 3.9 75 118 0.64 5.9 3.75 71 112 0.64 5.7 3.63 67 107 0.64
90 90 7.3 4.55 93 144 0.62 7.1 4.4 89 138 0.62 7 4.31 86 134 0.62
12.7/10 & 35
8/6 & 27
8/6 & 32
8/6 & 35
Total
Sensible
Cellar Size
SHR
12.7/10 & 27
12.7/10 & 32
Total
Sensible
Cellar Size
SHR
SHR
Total
Sensible
Cellar Size
SHR
CX
CKC
SHR
Total
Sensible
Cellar Size
Total
Sensible
Cellar Size
SHR
CX
CKC
Total
Sensible
Cellar Size

5/20
55908014-23
AIR FLOWS
INDOOR UNIT
Sound Pressure Levels in dB(A) at 10m distance in free field conditions. (Reference 2x10 ⁻⁵ N/m²)
OUTDOOR UNIT
Sound Pressure Levels (SPL) at 10m distance in free field conditions. (Reference 2x10 ⁻⁵ N/m²)
125 250 500 1K 2K 4K dB(A)
CX(E) 30 69.1 67.7 67.6 65.6 62.2 56 39
CX(E) 40 69.1 67.7 67.6 65.6 62.2 56 39
CX(E) 50 71.7 69.2 69.1 67.1 63.2 58.5 40.5
CX(E) 70 70.1 68.2 68.6 66.1 63.2 57.5 39.9
CX(E) 90 70.1 68.2 68.6 66.1 63.2 57.5 39.9
MAXIMUM
SPEED
SOUND POWER LEVELS
Frequency Hz
SOUND PRESSURE
LEVELS
125 250 500 1K 2K 4K dB(A)
CKC 20 77 67 69 65 60 54 39.2
CKC 30 77 68 69 65 60 54 39.3
CKC 40 77 67 69 65 60 54 39.2
CKC 50 74 68 67 66 61 54 38.9
CKC 60 73 68 68 66 62 54 39.3
CKC 80 71 69 68 65 60 54 38.7
CKC90 82 72 69 69 63 57 42.2
MAXIMUM
SPEED
SOUND POWER LEVELS
SOUND PRESSURE
LEVELS
Frequency Hz
SOUND POWER AND SOUND PRESSURE LEVELS
MODEL m³/s MODEL m³/s
CX(E) 30 0.61 CKC 20 0.32
CX(E) 40 0.61 CKC 30 0.71
CX(E) 50 0.66 CKC40 0.71
CX(E) 70 0.58 CKC 50 0.91
CX(E) 90 0.55 CKC 60 0.91
CKC 80 0.91
CKC90 0.91

6/20
55908014-23
Above 8°C System Matches
Above 4°C System Matches
UNIT ELECTRICAL LOADS [230V 50Hz 1Ph (A) or 400V 50Hz 3Ph (A/Ph)]
ELECTRICAL DATA
COOLING HEATING COOLING HEATING
kW kW AMPS AMPS AMPS
CX(E) 30 + CKC 20 1.3 2.9 7.7 13.8 30
CX(E) 40 + CKC 30 1.6 2.9 8.2 13.8 38
CX(E) 50 + CKC 50 2.2 2.9 9.7 13.8 60
CX(E) 70 + CKC 80 3.2 2.9 12.3 13.8 78
CX(E) 90 + CKC 90 4.4 2.9 17.7 13.8 116
COOLING HEATING COOLING HEATING
kW kW AMPS AMPS AMPS
CX(E) 70 + CKC 80 3.2 2.9 5.7 13.8 42
CX(E) 90 + CKC 90 4.4 2.9 7.9 13.8 50
MODEL
INDOOR/OUTDOOR
3 PH 4000V 50Hz
INPUT POWER
FULL LOADS AMPS
SYSTEM MAX.
STARTING CURRENT
SYSTEM MAX.
STARTING CURRENT
INPUT POWER
FULL LOADS AMPS
1 PH 230V 50Hz
MODEL
INDOOR/OUTDOOR
COOLING HEATING COOLING HEATING
kW kW AMPS AMPS AMPS
CXE 40 + CKC 20 1.3 2.9 7.7 13.8 30
CXE 50 + CKC 40 2.1 2.9 10.2 13.8 52
CXE 70 + CKC 60 2.4 2.9 9.8 13.8 63
CXE 90 + CKC 80 3.2 2.9 12.3 13.8 78
MODEL
INDOOR/OUTDOOR
1 PH 230V 50Hz
INPUT POWER
FULL LOADS AMPS
SYSTEM MAX.
STARTING CURRENT
MODEL
FAN
MOTOR
HEATER
CX(E) 30 0.8 13
CX(E) 40 0.8 13
CX(E) 50 0.8 13
CX(E) 70 0.8 13
CX(E) 90 0.8 13
CKC 20 30 40 50 60 80 90
Fan motor 0.4 0.6 0.6 0.6 0.6 0.6 0.6
R407C compressor
(1 Ph) nominal FLA
6 10.4 10.2 8.3 9.8 10.9 16.3
R407C compressor
(3 Ph) nominal FLA
- - - - - 4.3 6.5
Crankcase heater 0.25 0.25 0.25 - - - -

7/20
55908014-23
CX(E) DIMENSIONS
DIMENSIONS (mm)
CONDENSATE DRAIN 22mm OD
96
35 65 TYP.
140
75
215 36
17.5
17.5
39
39
124
422.5
70
845
888
124
888 (Fixing centres)
(Fixing centres)
320
96
MIN. 500
FOR SIDE ACCESS
483
20
X = Interconnecting Wiring
Z1= Suction
Z2= Liquid / Expansion
SIDE VIEW
(Wall mounted)
X
Z1
Z2
X
SIDE VIEW
(Ceiling mounted)
TOP VIEW
(Ceiling Mounted)
REAR VIEW
(Wall mounted)
FRONT VIEW
(Wall mounted)
120
MIN. 120
MIN.

8/20
55908014-23
INSTALLATION
CONTENTS
PARTS DESCRIPTION
QTY
ACTION
Envelope containing operating instructions and
Declaration of Conformity
1
Pass to the end user.
Mounting brackets
2
Use to hang unit.
Drain Stub/Nut/Gasket
1
Fitted by installer.
Drain stub adaptor
1
Convert to ¾" drain if required.
Screw M5
6
To fix brackets to unit.
Washer nylon
6
To fix brackets to unit.
Washer M5 shakeproof
6
To fix brackets to unit.
Reducing flare nut 1/2” – 3/8”
1
Fit to liquid connection on the CXE 70 indoor unit
when matched with a CKC 60 outdoor unit
The unit may be mounted on a wall or solid ceiling using brackets supplied. It should be matched with the appropriately
sized outdoor unit; this instruction should be used in conjunction with the outdoor unit installation instructions.
UNIT COMBINATIONS
1. Fit all kits prior to installing the unit. (Heater kit is easier to fit when unit has been mounted).
2. Ensure that the mounting surface will support the operating weight of the unit (see table below).
3. Mark out the mounting positions and drill holes to suit 6mm rawlbolt shields or equivalent strength fasteners
(ensure that the unit is positioned to give sufficient access (min 0.5m) to the removable side panel).
4. Fix the mounting brackets to the unit in the correct position for wall or ceiling mounting.
5. Raise the unit into position and secure the fixings,
ensuring that it is square and level.
6. Remove the drain tray then fit the drain stub, nut &
gasket. Refit the drain tray.
NITROGEN CHARGE
The unit contains a small charge of dry nitrogen, which should
be discharged into the atmosphere. This is a non-toxic, non-
ozone depleting gas with no global warming potential.
FITTING LOSSES, in equivalent straight lengths of pipe (m).
FITTING
Pipe Size OD
To calculate the total equivalent
length, the equivalent lengths of all
fittings in a pipe run must be added
to the actual length of pipe in the
run: these are the fittings most
likely to be used.
R = Radius of bend
d = Diameter of tube
C = Centres of bend
3/8"
1/2"
5/8"
3/4"
7/8"
45° Bend
0.12
0.15
0.18
0.21
0.24
90° Bend R/d = 1
0.37
0.43
0.49
0.55
0.61
90° Bend R/d = 1.5
0.24
0.27
0.3
0.37
0.43
180° Bend R/d = 1.5
0.73
0.91
1.1
1.28
1.46
180° Bend C/d = 2.5
0.46
0.55
0.64
0.76
0.85
90° Elbow
0.67
0.85
1.04
1.25
1.46
A. USING SUCTION AND LIQUID LINES:
With the expansion device connected to the indoor unit, the equivalent pipe run should be 20m maximum,
including a maximum lift of 7.5m. Fully insulate the suction line. Ensure the suction pipe is insulated well over
the drain tray at the indoor unit. Liquid lines should be routed to avoid hot areas. This prevents flash gas
forming, which may result in erratic control of liquid refrigerant to the evaporator.
SYSTEM 3/8" 1/2" 5/8" 3/4" 1/4" 3/8" 1/2"
CX(E)30 + CKC20 7.5 20 - - 20 - -
CX(E)40 + CKC30 - 15 20 - - 20 -
CX(E)50 + CKC50 - 7.5 18 20 -20 -
CX(E)70 + CKC80 - - 11 20 -20 -
CX(E)90 + CKC90 - - 10 20 - - 20
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
LIQUID LINE
DRAIN TRAY
GASKET
NUT
DRAIN STUB
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
CX(E) 30 CKC 20 CXE 40 CKC 20
CX(E) 40 CKC 30 CXE 50 CKC 40
CX(E) 50 CKC 50 CXE 70 CKC 60
CX(E) 70 CKC 80 CXE 90 CKC 80
CX(E) 90 CKC 90
Minimum Set Temperature 8°C
Minimum Set Temperature 4°C

9/20
55908014-23
B. USING SUCTION AND EXPANSION LINES
The expansion assembly must be removed from the indoor unit and connected to the outdoor unit allowing a
pipe run of up to 80m, including a maximum lift of 20m (CKC20 maximum 50m with 7.5m lift).
CX(E) units only, remove the right hand panel cover plate from the indoor unit and remove the expansion
assembly. [Make good the gap using Extended Pipe Run Kit 55900709 (30,40,50), 55900710 (70).]
Fit the expansion assembly onto the outdoor unit liquid line service valve. Fully insulate both the suction and
expansion lines, including the expansion device: ensure the pipes are insulated well over the drain tray at the
indoor unit.
CX(E) units only, remove the right hand panel cover plate from the indoor unit and remove the expansion assembly.
[Make good the gap using Extended Pipe Run Kit 55900709 (30,40,50), 55900710 (70,90).]
PIPE CONNECTIONS
Units are supplied with the following male flare connections (sizes in inches):
SYSTEM 3/8" 1/2" 5/8" 3/4" 1/4" 3/8" 1/2"
CX(E)40 + CKC20 7.5 20 - - 20 - -
CX(E)50 + CKC40 - 15 20 - - 20 -
CX(E)70 + CKC60 - 7.5 18 20 -20 -
CX(E)90 + CKC80 - - 11 20 -20 -
MAXIMUM EQUIVALENT LENGTH OF
SUCTION LINE PIPE SIZES (m)
LIQUID LINE
SYSTEM 3/8" 1/2" 5/8" 3/4" 7/8" 1 - 1/8" 3/8" 1/2" 5/8"
CX(E)30 + CKC20 7.5 23 50 - - - 50 - -
CX(E)40 + CKC30 -15 50 80 - - 7.5 80 -
CX(E)50 + CKC50 - 7.5 18 50 80 - 7.5 50 80
CX(E)70 + CKC80 - - 11 30 80 - - 50 80
CX(E)90 + CKC90 - - 10 25 55 80 -20 80
SYSTEM 3/8" 1/2" 5/8" 3/4" 7/8" 1 - 1/8" 3/8" 1/2" 5/8"
CX(E)40 + CKC20 7.5 23 50 - - - 50 80 -
CX(E)50 + CKC40 -10 36 80 - - 7.5 80 -
CX(E)70 + CKC60 - - 14 36 80 - 7.5 50 80
CX(E)90 + CKC80 - - 11 30 80 - - 50 80
EXPANSION LINE
EXPANSION LINE
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
INDOOR UNIT CX(E)30 CX(E)40 CX(E)50 CX(E)70 CX(E)90
LIQUID / EXPANSION 3/8" 3/8" 3/8" 1/2" 1/2"
SUCTION 1/2" 1/2" 1/2" 5/8" 5/8"
OUTDOOR UNIT CKC20 CKC30 CKC40 CKC50 CKC60** CKC80 CKC 90
LIQUID / EXPANSION 3/8" 3/8" 3/8” 3/8" 3/8” 1/2" 1/2"
SUCTION 1/2" 1/2" 1/2” 1/2" 5/8” 5/8" 5/8"

10/20
55908014-23
RESTRICTORS
Indoor units are supplied with restrictors fitted.
INTERCONNECTING PIPEWORK
1. The indoor unit has a low pressure charge of N2, which may be safely released into the atmosphere
before connection. The service valves on the outdoor unit should remain closed (IN, fully clockwise)
until pipework has been fitted and system evacuated.
2. Connecting the pipework
a. Remove the flare nuts from the suction and liquid service valves.
b. Ensure that the suction line is fully insulated: if an expansion line is used this should also be fully
insulated.
c. Place the flare nuts over the incoming pipework and flare the pipe ends. The use of a little
refrigeration oil on the flaring tool will help.
d. Connect the pipework between the units. Do not leave pipe ends, valves etc. open to the
atmosphere.
R407C is very hygroscopic and will absorb damaging levels of moisture if left open.
Always use two spanners when tightening the flare nuts to avoid twisting the pipes. Use a small
amount of refrigerant oil on the mating surfaces.
e. Sight glasses and filter driers are not necessary, but if required should be fitted between the
outdoor unit liquid shut off valve and the expansion device.
EVACUATING
1. Connect a vacuum pump to the service ports on the outdoor unit valves and evacuate the system to 1000
microns (1 Torr) or better and allow to be held for a minimum of 15 minutes.
2. Replace the caps on the service ports, (torque to 25NM).
ADDING REFRIGERANT
1. All units are fitted with head pressure control. The link wire across the orange terminals allows the fan
to operate at full speed. THIS SHOULD BE REMOVED AFTER CHARGING
2. If a manual HP cut-out is fitted, ensure that the reset button is depressed.
3. A 3 minute delay occurs between successive compressor operations.
4. R407C should be introduced through the Schrader valve on the indoor unit, or the service port on the
suction service valve on the outdoor unit. No other refrigerant must be used.
No extra POE oil needed with liquid lines.
Charges shown are for guidance: actual charge will depend on the individual application. It is recommended that you
charge to a sweat line on the outlet of the evaporator and/or a full sight glass if fitted.
CKC REFRIGERANT
NOTE
When the CXE 40 is matched with a CKC 20.
The restrictor in the indoor unit must be changed to 0.033"
When the CXE 50 is matched with a CKC 40.
The restrictor in the indoor unit remains as a 0.050"
When the CXE 70 is matched with a CKC 60.
The restrictor in the indoor unit must be changed to 0.057"
When the CXE 90 is matched with a CKC 80.
The restrictor in the indoor unit must be changed to 0.063"