Marstair CX Series User manual

55908014-19
CX(E) SPLIT SYSTEMS
TECHNICAL MANUAL
CX(E) LOW TEPERATURE SPLIT SYSTEMS

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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
17
CKC UNITS
18
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 –6.8 kW. These units are matched with CKC outdoor units
to complete a system.
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.
3. These units contain live electrical components, moving parts and refrigerant under pressure.
Always site out of reach of children and protect from vandalism.
4. 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

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MODEL
CX 30
CX 40
CX 50
CX 70
PART NUMBER
55917001
55917002
55917003
55917004
MODEL
CXE 30
CXE 40
CXE 50
CXE 70
PART NUMBER
55917017
55917016
55917015
55917014
MODEL
CKC 20 1ph
CKC 30 1ph
CKC 50 1ph
CKC 80 1ph
CKC 80 3ph
PART NUMBER
55020720
55020730
55020722
55020723
55020724
EXPANSION DEVICE
55023323
55023324
55023327
55023329
55023329
Low Temperature Match
MODEL
CXE 40
CXE 50
CXE 70
PART NUMBER
55917016
55917015
55917014
MODEL
CKC 20 1ph
CKC 40 1ph
CKC 60 1ph
PART NUMBER
55020720
55020741
55020740
EXPANSION DEVICE
55023323
55023325
55023328
INDOOR UNIT
OUTDOOR UNIT
CX(E) 30
CKC 20
CX(E) 40
CKC 30
CX(E) 50
CKC 50
CX(E) 70
CKC 80
Low Temperature Match
INDOOR UNIT
OUTDOOR UNIT
CXE 40
CKC 20
CXE 50
CKC 40
CXE 70
CKC 60
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 only
55900715
3kW heater (CXE only)
* When matched with CKC outdoor units
CX(E) OPTIONS
DIMENSIONS & WEIGHTS
UNIT COMBINATIONS
PART NUMBERS

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MODEL
UNPACKED
PACKED
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
CKC
HEIGHT
WIDTH
DEPTH
WEIGHT
HEIGHT
WIDTH
DEPTH
WEIGHT
1Ph
3Ph
1Ph
3Ph
20
620
900
310
46
-
625
980
340
48
-
30
620
900
310
48
-
625
980
340
55
-
50
720
1000
310
64
-
730
1080
340
66
-
60
720
1000
310
64
730
1080
340
66
-
80
720
1000
310
66
64
730
1080
340
68
66
MODEL
RATING CONDITIONS
(ROOM 12.7C / 10C) (AMBIENT 27C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SHR
SENSIBLE
240V
230V
CX(E) 30 + CKC 20
2.80
0.75
2.10
3.25
3.0
CX(E) 40 + CKC 30
3.30
0.68
2.24
3.25
3.0
CX(E) 50 + CKC 50
4.60
0.66
3.02
3.25
3.0
CX(E) 70 + CKC 80
6.80
0.63
4.30
3.25
3.0
MODEL
RATING CONDITIONS
(ROOM 12.7C / 10C) (AMBIENT 35C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SHR
SENSIBLE
240V
230V
CX(E) 30 + CKC 20
2.38
0.75
1.79
3.25
3.0
CX(E) 40 + CKC 30
2.81
0.68
1.90
3.25
3.0
CX(E) 50 + CKC 50
3.91
0.66
2.57
3.25
3.0
CX(E) 70 + CKC 80
5.78
0.63
3.66
3.25
3.0
Low Temperature Match
MODEL
RATING CONDITIONS
(ROOM 5Cdb/ 3Cwb) (AMBIENT 27C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SHR
SENSIBLE
240V
230V
CXE 40 + CKC 20
2.3
0.85
2.0
3.3
3.0
CXE 50 + CKC 40
3.5
0.80
2.8
3.3
3.0
CXE 70 + CKC 60
5.0
0.70
3.5
3.3
3.0
MODEL
RATING CONDITIONS
(ROOM 5Cdb/ 3Cwb) (AMBIENT 35C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SHR
SENSIBLE
240V
230V
CXE 40 + CKC 20
2.0
0.85
1.7
3.3
3.0
CXE 50 + CKC 40
3.0
0.80
2.4
3.3
3.0
CXE 70 + CKC 60
4.3
0.70
3.0
3.3
3.0
PERFORMANCE DATA (kW)

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AIR FLOWS
MODEL
m³/s
MODEL
m³/s
CX(E) 30
0.61
CKC 20
0.97
CX(E) 40
0.61
CKC 30
0.97
CX(E) 50
0.66
CKC 50
0.97
CX(E) 70
0.58
CKC 80
0.97
INDOOR UNIT
MAXIMUM
SPEED
SOUND POWER LEVELS
SOUND PRESSURE
LEVELS
SPEED
Frequency Hz
125
250
500
1K
2K
4K
dB(A)
CX(E) 30
69.1
67.7
67.6
65.6
62.2
56.0
39
CX(E) 40
69.1
67.7
67.6
65.6
62.2
56.0
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
Sound Pressure Levels in dB(A) at 10m distance in free field conditions. (Reference 2x10 ⁻⁵ N/m²)
OUTDOOR UNIT
MAXIMUM
SPEED
SOUND POWER LEVELS
SOUND PRESSURE
LEVELS
SPEED
Frequency Hz
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 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
Sound Pressure Levels (SPL) at 10m distance in free field conditions. (Reference 2x10 ⁻⁵ N/m²)
SOUND POWER AND SOUND PRESSURE LEVELS

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MODEL
INDOOR/OUTDOOR
1 PH 230V 50Hz
INPUT POWER
FULL LOADS AMPS
SYSTEM
MAX.
STARTING
CURRENT
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
MODEL
INDOOR/OUTDOOR
3 PH 400V 50Hz
INPUT POWER
FULL LOADS AMPS
SYSTEM
MAX.
STARTING
CURRENT
COOLING
HEATING
COOLING
HEATING
kW
kW
AMPS
AMPS
AMPS
CX(E) 70 + CKC 80
3.2
2.9
5.7
13.8
42
Low Temperature Match
MODEL
INDOOR/OUTDOOR
1 PH 230V 50Hz
INPUT POWER
FULL LOADS AMPS
SYSTEM
MAX.
STARTING
CURRENT
COOLING
HEATING
COOLING
HEATING
kW
kW
AMPS
AMPS
AMPS
CXE 40 + CKC 20
1.3
3.1
7.15
12.8
28
CXE 50 + CKC 40
2.1
3.1
10.2
13.8
50
CXE 70 + CKC 60
2.4
3.1
9.8
13.8
61
UNIT ELECTRICAL LOADS [230V 50Hz 1Ph (A) or 400V 50Hz 3Ph (A/Ph)]
MODEL
FAN MOTOR
HEATER
CX(E) 30
0.8
13.0
CX(E) 40
0.8
13.0
CX(E) 50
0.8
13.0
CX(E) 70
0.8
13.0
CKC
20
30
40
50
60
80
Fan motor
0.6
0.6
0.6
0.6
0.6
0.6
R407C compressor (1 Ph) nominal FLA
6.0
10.4
10.2
8.3
9.8
10.9
R407C compressor (3 Ph) nominal FLA
-
-
-
-
-
4.3
Crankcase heater
0.25
0.25
0.25
-
0.25
-
ELECTRICAL DATA

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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.

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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.
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE SIZES (m)
LIQUID LINE
SYSTEM
3/8"
1/2"
5/8"
3/4"
1/4"
3/8"
CX(E)30 + CKC20
7.5
20
-
-
20
-
CX(E)40 + CKC30
-
15
20
-
-
20
CX(E)50 + CKC50
-
7.5
18
-
-
20
CX(E)70 + CKC80
-
-
11
20
-
20
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE SIZES (m)
LIQUID LINE
Minimum Set Temperature 4°C
INDOOR UNIT
OUTDOOR UNIT
CXE 40
CKC 20
CXE 50
CKC 40
CXE 70
CKC 60
Minimum Set Temperature 8°C
INDOOR UNIT
OUTDOOR UNIT
CXE 30
CKC 20
CXE 40
CKC 30
CXE 50
CKC 50
CXE 70
CKC 80
DRAIN TRAY
GASKET
NUT
DRAIN STUB

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SYSTEM
3/8"
1/2"
5/8"
-
1/4"
3/8"
CXE40 + CKC20
7.5
20
-
-
20
--
CXE50 + CKC40
-
15
20
-
-
20
CXE70 + CKC60
-
7.5
18
20
-
20
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.
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
EXPANSION LINES
SYSTEM
3/8"
1/2"
5/8"
3/4"
7/8"
3/8"
1/2"
5/8"
CX(E)30 + CKC20
7.5
23
50
-
-
50
-
-
CX(E)40 + CKC30
-
10
36
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
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
EXPANSION LINES
SYSTEM
3/8"
1/2"
5/8"
3/4"
7/8”
3/8"
1/2"
5/8"
CXE40 + CKC20
7.5
23
50
-
-
50
-
-
CXE50 + CKC40
-
10
36
80
-
7.5
80
-
CXE70 + CKC60
-
7.5
18
50
80
7.5
50
80
PIPE CONNECTIONS
Units are supplied with the
following male flare connections
(sizes in inches):
RESTRICTORS
Indoor units are supplied with restrictors fitted.
OUTDOOR UNIT
CKC20
CKC30
CKC40
CKC50
CKC60**
CKC80
LIQUID / EXPANSION
3/8"
3/8"
3/8”
3/8"
3/8”
1/2"
SUCTION
1/2"
1/2"
1/2”
1/2"
5/8”
5/8"
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"

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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.
NOTE: LABEL R407C POE (supplied loose) TO BE FIXED ABOVE SERVICE VALVES.
CHARGE (g)
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.
Charge
based on:-
Liquid line
Expansion line
1/4"
3/8"
3/8"
1/2"
5/8"
25 g/m
60 g/m
16 g/m
30 g/m
48 g/m
Additional POE oil
25g per 350g of additional refrigerant to a maximum of 300g
NOTE: The new 20 Series CKC are supplied with a Nitrogen holding charge. See pages 11 & 12 for
refrigerant charge information.
5. Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the
evaporator. Typical suction pressure on short lines at UK conditions should be approx. 3.8bar (55 psig).
CKC REFRIGERANT