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TECHNICAL MANUAL
CX(E)A SPLIT SYSTEMS
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INDEX
CONTENTS
PAGE
PART NUMBERS, UNIT COMBINATIONS, OPTIONS, DIMENSIONS & WEIGHTS
3
PERFORMANCE DATA & AIR FLOW SOUND POWER AND SOUND
PRESSURE LEVELS
4
ELECTRICAL DATA
5
CX(E)A
DIMENSIONS
6
INSTALLATION: CONTENTS & PIPEWORK
7
ELECTRICAL: CONNECTIONS & FUSES
8
CKA
INSTALLATION
8
PIPEWORK: FITTING LOSSES, INTERCONNECTING PIPEWORK
& EVACUATING
9
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)A models are electromechanical / Electronic control units that use R410A refrigerant; they
provide cooling within the range of 2.8 – 5.6 kW. These units are matched with CKA outdoor units
to complete a system.
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)A unit. For system details add input power and
current of indoor and outdoor unit, including any heater load.
GENERAL
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MODEL
CXA 30
CXA 50
CXA 70
PART NUMBER
56400004
56400005
56400005
MODEL
CX(E)A 30
CX(E)A 50
CX(E)A 70
PART NUMBER
56400002
56400003
56400006
MODEL
CKA 35 1ph
CKA 50 1ph
CKA 70 1ph
PART NUMBER
56500002
56500003
56500004
INDOOR UNIT
OUTDOOR UNIT
CX(E)A 30
CKA 35
CX(E)A 50
CKA 35
CX(E)A 50
CKA 50
CX(E)A 70
CKA 70
OPTIONAL KITS
PART NUMBER
DESCRIPTION
55900700
3kW heater (CXA only)
55900701
Digital temperature display (CXA only) STD on CX(E)A
55900702
De-ice thermostat (CXA only) STD on CX(E)A
55900715
3kW heater (CX(E)A only)
MODEL
UNPACKED
PACKED
CX(E)A
HEIGHT
WIDTH
DEPTH
WEIGHT
HEIGHT
WIDTH
DEPTH
WEIGHT
30
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
CKA
HEIGHT
WIDTH
DEPTH
WEIGHT
HEIGHT
WIDTH
DEPTH
WEIGHT
1Ph
1Ph
35
552
760
256
35
620
863
376
38
50
552
760
256
42
620
863
376
46
70
660
860
307
56
730
990
415
63
CX(E)A OPTIONS
DIMENSIONS & WEIGHTS
UNIT COMBINATIONS
PART NUMBERS
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MODEL
RATING CONDITIONS
(ROOM 12.7C / 10C) (AMBIENT 35C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SENSIBLE
240V
230V
CX(E)A 30 + CKA 35
2.20
1.77
3.25
3.0
CX(E)A 50 + CKA 35
2.83
2.15
3.25
3.0
CX(E)A 50 + CKA 50
3.50
2.45
3.25
3.0
CX(E)A 70 + CKA 70
4.62
3.24
3.25
3.0
AIR FLOWS
INDOOR UNIT
MAXIMUM
SPEED
SOUND PRESSURE
LEVELS
dB(A)
NC
CX(E)A 30
55
48
CX(E)A 50
56
50
CX(E)A 70
56
49
Sound Power Levels were obtained in full accordance with the direct method of BS EN ISO3174:2000. Levels are shown in dB
with a standard reference of 1 pW.
Sound Pressure Levels in dB(A) refer to semi-hemispherical radiation (wall or ceiling mounted) at a distance of 1.5m from the
front of the unit, with the fan operating at full speed.
OUTDOOR UNIT
MAXIMUM
SPEED
SOUND PRESSURE
LEVELS
dB(A)
NC
CKA 35
55
44
CKA 50
58
44
CKA 70
58
44
Sound Power Levels were obtained in full accordance with the direct method of ISO 3741: 1988. Levels are shown in dB with a
standard reference of 1 pW.
Sound Pressure Levels in dB(A) refer to semi-hemispherical radiation (wall or floor mounted) at a distance of 3m from the front
of the unit, with the fan operating at full speed; (add 3dBA or 3NC for units at an intersection of a wall, add 1dBA or 1NC for high
level wall mounted units).
MODEL
RATING CONDITIONS
(ROOM 12.7C / 10C) (AMBIENT 27C / 19C)
OPTIONAL ELECTRIC
HEATER
TOTAL
SENSIBLE
240V
230V
CX(E)A 30 + CKA 35
2.28
1.98
3.25
3.0
CX(E)A 50 + CKA 35
3.25
2.48
3.25
3.0
CX(E)A 50 + CKA 50
4.25
2.90
3.25
3.0
CX(E)A 70 + CKA 70
5.60
3.83
3.25
3.0
MODEL
m³/s
MODEL
m³/s
CX(E)A 30
0.61
CKA 35
0.81
CX(E)A 50
0.66
CKA 50
0.78
CX(E)A 70
0.58
CKA 70
0.70
SOUND POWER AND SOUND PRESSURE LEVELS
PERFORMANCE DATA (kW)
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Indoor CX(E)A
30
50
50
70
Outdoor CKA
35
35
50
70
Rated Current Cooling A
5.2
5.2
8.0
11.0
Maximum Running Current A
7.3
7.3
10.8
14.2
Starting Current A
26.0
26.0
40.0
61.0
UNIT ELECTRICAL LOADS [230V 50Hz 1Ph (A) or 400V 50Hz 3Ph (A/Ph)]
MODEL
FAN MOTOR
HEATER
CX(E)A 30
0.8
13.0
CX(E)A 50
0.8
13.0
CX(E)A 70
0.8
13.0
INTERCONNECTING WIRING
2 CORE + EARTH 1.5mm 3 CORE + EARTH 1.5mm
ELECTRICAL DATA
INTERCONNECTING INSTRUCTIONS FOR CX(E)A AND CKA SYSTEMS
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(Wall mounted)
FRONT VIEW
(Wall mounted)
REAR VIEW
(Ceiling Mounted)
TOP VIEW
(Ceiling mounted)
SIDE VIEW
X
2Z
1Z
X
(Wall mounted)
SIDE VIEW
= Liquid / Expansion 2
Z
= Suction 1
Z
X = Interconnecting Wiring
20
483
FOR SIDE ACCESS
MIN. 500
96
320
120
888 (Fixing centers)
124
888
845
70
422.5
124 (Fixing centers)
39
39
60
17.5
17.5
MIN.
120
36
215
75
140
65 TYP.
35
96
CONDENSATE DRAIN 22mm OD
CX(E)A DIMENSIONS
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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.
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
electrics access side).
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 (Fig.1). Refit the drain tray.
Fig.1
CX(E)A PIPEWORK
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.
PIPE CONNECTIONS
Pipework is terminated with 2 flare nuts & bonnets. Access is via the rear right hand side. Pipes exit the unit
through holes in the back panel.
CONDENSATE DRAIN
Push fit connections are widely available for the 7/8” (22mm) OD condensate drain and 3/4"(19mm) ID drain
stub adaptor. Alternatively 7/8” (22mm) bore plastic tubing may be fitted directly to the stub/adaptor with a
hose clamp. Take care not to over tighten hose clamps as this could damage the stub pipe.
CONTENTS
PARTS DESCRIPTION
ACTION
Envelope containing operating instructions
and Declaration of Conformity
Pass to the end user
Drain Stub/Nut/Gasket
Fitted by installer
Drain stub adaptor
Convert to ¾" drain if required
Mounting brackets plus fixings
Use to hang unit
INTERCONNECTING PIPEWORK (Max 15 metres)
Torque (NM)
Nut A/F (mm)
System
Liquid/
Expansion
Suction
Liquid
Line
Suction
Line
Liquid
Line
Suction
Line
CX(E)A 30 + CKA35
1/4"
1/2"
17
54
17
24
CX(E)A 50 + CKA35
1/4"
1/2"
17
54
17
24
CX(E)A 50 + CKA50
1/4"
1/2"
17
54
17
24
CX(E)A 70 + CKA70
3/8”
5/8”
34
73
22
27
CX(E)A INSTALLATION
DRAIN TRAY
GASKET
NUT
DRAIN STUB
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Cables are routed to the terminal block via the cable cord grips at the rear of the unit and then through
the back of the electrics box (see page 2).
Cables MUST be size compatible with the recommended system fuse.
FUSES
SYSTEM
COOL ONLY
WITH ELECTRIC
HEATER
1PH
3PH
1PH
3PH
CX(E)A30 + CKA35
16A - 16A
-
CX(E)A50 + CKA35
20A - 20A
-
CX(E)A50 + CKA50
20A - 20A
-
CX(E)A70 + CKA70
20A - 32A
-
Note: On 3 ph systems the supply must go to the CKA outdoor unit and then to the CX(E)A indoor unit.
MOUNTING
Whether floor or wall mounted, it is essential that the mounting surface is capable of supporting the unit
weight. Leave space around the unit for air circulation and access for installation and maintenance.
1. Individual pipe runs to a maximum of 15m, including 7.5m lift, are permissible.
Performance is based on 7.5m pipe runs. Correctly sized pipes for each installation will result in no
significant loss of capacity on extended pipe runs.
a) Pipe sizes are based on:-
Minimum of 3.8 m/s (750 fpm) suction gas velocity for horizontal or downflow.
Minimum of 7.6 m/s (1500 fpm) suction gas velocity for upflow.
Maximum of 15.2 m/s (3000 fpm) suction gas.
b) Where vertical risers exceed 3m, oil traps must be formed in the pipe. This will help ensure that oil
returns to the compressor. Typically fit an oil trap every 3m with a trap at the bottom of the riser.
2. In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into
account. The table below covers the fittings most likely to be encountered in this installation.
The equivalent lengths of all the fittings in a pipe run should be added together and the total added to
the actual pipe length in order to calculate the total equivalent length.
3. Use the shortest possible route, avoiding sharp bends.
4. Completely insulate the suction line, fully over the indoor unit drain tray.
1500 min air off
100 min
100 min
600 min
CX(E)A ELECTRICAL CONNECTIONS
CKA INSTALLATION
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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"
45° Bend
0.12
0.15
0.18
90° Bend R/d = 1
0.37
0.43
0.49
90° Bend R/d = 1.5
0.24
0.27
0.3
180° Bend R/d = 1.5
0.73
0.91
1.1
180° Bend C/d = 2.5
0.46
0.55
0.64
90° Elbow
0.67
0.85
1.04
A. SUCTION AND LIQUID/EXPANSION LINES:
The expansion capillary is located in the outdoor unit and the equivalent pipe run is 15m maximum, including
a maximum lift of 7.5m. Fully insulate the suction and liquid/expansion 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/EXPANSION LINE
TOTAL CHARGE (Kgs)
For 7.5m
SYSTEM
1/2"
5/8"
1/4"
3/8"
-
CX(E)A30 + CKA 35
15
-
15
-
0.85
CX(E)A50 + CKA 35
15
-
15
-
1.05
CX(E)A50 + CKA 50
15
-
15
-
1.50
CX(E)A70 + CKA 70
-
15
-
15
2.25
For systems with interconnecting pipework in excess of 7.5 metre add 20gms per metre on
CKA 35 & CKA 50, add 30gms per metre on CKA 70. No additional oil is required.
INTERCONNECTING PIPEWORK
1. Indoor and outdoor units have 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, to avoid unnecessary moisture ingress.
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.
R410A 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. Release the nitrogen holding charge in the indoor and outdoor units to atmosphere. Open the valves
(hex drive fully out) using a 5mm Allen key. 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).
CKA PIPEWORK
TEV LTD, ARMYTAGE ROAD, BRIGHOUSE, WEST YORKSHIRE, HD6 1QF. + 44 (0) 1484 405600 +44 (0) 1484 405620
sales@marstair.com www.marstair.com
TEL: FAX:
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