York MKC 12S Quick start guide

Cassette
MINISPLIT
MKC / MKH 12-18-24
Infrared remote
control
MOC / MOH
YORK
®
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2
List of Contents
Page
1 - Safety...................................................................................................................................................................................3
2 - Indoor and outdoor onits......................................................................................................................................3
2.1 - Indoor unit...........................................................................................................................................................3
2.2 - Panel with return grille for indoor unit..........................................................................................3
2.3 - Outdoor unit.......................................................................................................................................................3
2.4 - Auto restart and anti freeze protection.......................................................................................3
3 - Technical specifications........................................................................................................................................3
4 - Dimensions.....................................................................................................................................................................4
5 - Installation........................................................................................................................................................................5
6 - Condensate drainage.............................................................................................................................................6
7 - Refrigerant piping connections.......................................................................................................................7
8 - Wiring diagram.............................................................................................................................................................8
9 - Front panel installation..........................................................................................................................................8
10 - Maintenance...............................................................................................................................................................10
11 - Technical appendix................................................................................................................................................10
Parts List: (Contact York)
Decommissioning, Dismantling and Disposal
1 - Safety
Installation and maintenance of this air conditioning system
should only be carried out by trained and qualified personnel.
Regular maintenance operations such as cleaning the coils and
air filters must be performed to keep the units in proper
operating condition.
CAUTION
Before undertaking any work on the unit, make sure that the
power supply has been disconnected.
ELECTRICAL CONNECTIONS
All electrical wiring and connections must comply with local
standards.
GENERAL PRECAUTIONS
Check that the power supply available agrees with nameplate
voltage.
Use adequate line protection.
The unit must be grounded.
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3
2 - Indoor & outdoor units
3 - Technical specifications
2.1 - Indoor unit
Each unit is shipped with the following items:
-an indoor unit ready for connection to the condensing unit,
-mounting brackets,
-a technical tuide,
-a user's tuide,
-an infrared remote control with a wall bracket and 2 batteries,
-a cut-out template for the casing printed on the cassette
packing box.
2.2 - Panel with return grille for indoor unit.
2.3 - Outdoor unit
The units are shipped complete with a charge of R22 refrigerant
sufficient for a piping length of 7.5 metres.
2.4 - Auto restart and anti freeze protection
-After a power failure, the unit restarts automatically (when
power is resumed) in the same mode.
-When evaporator surface temperature is –2°C, the compressor
is stopped, the fan continues to run. Compressor operation is
resumed when temperature rises to 0°C.
Indoor MKC - MKH
Models unit 12S 18S 24S
Outdoor MOC - MOH
unit 12 18 25
Cooling Btu/h 12 000 18 000 24 000
kW 3.5 5.3 7
Capacities Heating Btu/h 12 500 18 500 25 100
kW 3.6 5.4 7.1
Electric heating kW 2 2 2
(option)
Compressor Type Rotary Reciprocating
Refrigerant R-22
Power supply V/Ph/Hz 220/240-1-50
Power input kW 1.3 2 2.8
Nominal current A 6.3 9.4 13
Current draw (Electric heat) A 9.1 9.1 9.1
Indoor air flow m3/h 640 850 950
Noise level at 3m
Indoor
dBA 18/24/27 26/30/33 32/36/38
Outdoor 37 55 56
Operating controls Wireless remote control
H (mm) 300/492 300/590 300/696
Dimensions Indoor/Outdoor W (mm) 575/764 575/820 575/850
D (mm) 575/230 575/280 575/287
Net weight Indoor kg 20 22 24
Outdoor 38 59 65
Type of connection Flared
Piping Diameter Gas 1/2" 5/8" 5/8"
Liquid 1/4" 3/8" 3/8"
Dehumidification l/h 1.7 2.5 3.2
Nominal cooling capacity based on : Nominal heating capacity based on :
- Indoor air temp. 27°C DB/19°C WB - Indoor air temp. 21°C DB - Outdoor air temp. 7°C DB/6°C WB
- Outdoor air temp. 35°C DB Piping length : 7.5 m
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4
4 - Dimensions
MOC - MOH
12-18 25
A200 200
B400 400
C100 100
D200 250
E600 600
Unit Clearances
Aminimum of clearance is necessary around the units to ensu-
re proper air circulation and easy access for maintenance.
Unit dimensions are shown in the technical characteristics
table on page 3.
Outdoor unit: MOC/MOH 12-18 Outdoor unit: MOC/MOH 25
H
LP
Clearances required for outdoor units
C
B EA D
54
2
3
660 575
1
660
1. False ceiling
2. Condensate drainage
3. Gas line connection
4. Liquid line connection
5. Removable electrical box
6. Holes ø 2,9 mm
7. Pre-stamped knock-out for remote air discharge
8. Pre-stamped knock-out for outdoor air intake
Note:An outdoor air grille and an air filter must be used with the
outdoor air intake.
W
W
H
D
D
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5
5 - Installation
OK
• Outdoor unit installation
•Location of the indoor unit
The unit should be installed in such a way that airflow around the
room is not hindered in any way. If possible, install the cassette
unit in the centre of the room (leave at least one meter of clea-
rance on all sides of the unit).
Air diffusion will be less efficient if the ceiling is at a height grea-
ter than 3 metres.
The cassette unit is fixed in place with two brackets and four
threaded rods (see diagram below).
ø8
630
The two brackets must be installed perfectly level.
When the cassette is in place on its supports, connect the refri- geration lines, the electrical power supply and the condensate drainage line.
False ceiling
Infrared receiver board located behind the air
return grill.
View :
LED : OPE : Unit startup.
POWER : Unit power-up.
TIMER : Timer mode.
Emergency operation : Enables the unit to
be used without the remote control.In this
case, set the selector to "COOL" or "HEAT"
(MKH only) depending on the operating mode
required. The "OPE" LED flashes continuous-
ly when the unit is operated this way, and the
remote control is forced off-line. The tempera-
ture setpoint is set at 24°C both in the heating
and cooling mode. To revert to normal remote
control operation, set the selector to the
"NOR" position.
Connectors COOL NOR HEAT
IR
OPE
POWER
TIMER
• Connections
Suction line
Liquid line
Electrical connections between sections
Electric heat supply (option)
Condensate water evacutation
Indoor unit
Outdoor unit
Remote control
Main electrical power supply
Optional electric heating coil AKR01A (2kW) :
MKC (cooling only) : The heating element, instal-
led around the coil like a belt, is activated by a
relay located on the control board. Installation of
this option requires no particular modification of
the equipment.
MKH (heat pump) :The heating element is acti -
vated by a relay located on the control board.
Installation requires a separate power supply
with 3 x 1,5 mm2conductors for the 2 kW heating
element.
In this instance, the heating element serves as a
backup heating source (1str stage : COMPRESSOR -
2nd stage : ELECTRIC HEATER ) and is regulated
according to the temperature difference between
the setpoint and the return air temperature.
The heater element is supplied with an automa-
tic reset control thermostat and a manually reset
high temperature safety device.
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6
Condensate drainage
Condensates collected in the drain pan are piped to a tank fitted
with :
- a drainage pump, with a pumping height of 0.6 m measured
from the base of the cassette unit (see diagram opposite),
-a safety float switch that stops the entire unit in the event of a
problem with condensate drainage (pump failure, obstructed
drainage piping...).
The condensate drainage line must be insulated to prevent dro-
plets of condensation from dripping on the false ceiling.
Connect the drainage tube (ø int. 12 mm) coming from the pump
to a "P.V.C." drainage line (ø 32 mm mini). It is advisable to install
a U bend in the drainage line.Make sure that all piping joints are
leak tested.
Drainage piping should be installed with a 1% downward slope
(1cm per metre) without any rises.
6 - Condensate drainage
Verification of condensate water drainage:
Fill the drain pan and observe evacuation.
Fill the drain pan manually with water to check correct
evacuation.
Gradient > 1%
Gradient > 1%
Max.0.6m
1%
Max. 0.6 m
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7
7 - Refrigerant piping connections
Make piping runs as short as possible and avoid all
unnecessary changes in direction or elevation.
To prevent heat loss, the two lines must be insulated
separately.
Use an appropriate bending tool to form curves and avoid
flattening the refrigerant tubes.
Fix piping with pipe clamps and make sure that any eventual
pipe vibrations cannot be transmitted to the building structure.
Use refrigeration quality piping only with an operating pres-
sure rating of at least 30 bars. Never use ordinary «plum-
bing» quality piping : you MUST use special de-oxidised,
dehydrated, refrigerant quality copper piping.
Pipe lengths
• Maximum piping lengths
Note: Where the difference in elevation between the indoor
unit and the outdoor unit is greater than 5 metres, install
an oil trap every 5 metres.
The suction line must have a 2% gradient up to the compressor
on horizontal sections.
Where piping lengths are unusually long and include a large
number of oil traps, it may be necessary to adjust the compres-
sor oil charge.
D
L
L
•Refrigerant charge to be added per extra metre of
piping length when more than 7.5 m.
Refrigerant piping connections (FLARE connections)
To avoid alteration of unit capacities, make sure that piping
lengths and changes in elevation are kept to a strict minimum.
Before connecting the refrigerant lines, follow the procedures
below (if pre-charged connection lines are not supplied) :
-Select copper pipe diameters according to the size of unit to
be installed.
-Install the refrigeration lines, making sure that no foreign
bodies get inside the piping.
-Install the flare connectors and flare the ends of the pipes.
-Evacuate the piping. This operation, which should last at
least 15 minutes or even longer if there are large piping
lengths and changes in elevation, should be followed by a
leak test. To this effect, when the piping has been evacua-
ted, close the pressure guage tap, note the value on the
guage, then wait for 15 minutes. If the needle moves, there
is a leak in the system. Make the necessary adjustments or
repairs and repeat this procedure until the needle no longer
moves.
-Open the service valves and top up the refrigerant charge if
necessary.
Minimum thickness 6 mm
Insulation
Heat pump
Heat pump
(discharge)
Gas
Cooling
(suction)
Liquid
Cooling
Heat pump
Heat pump
(discharge)
Gas
Cooling
(suction)
Liquid
Cooling
Gas line
Liquid line
R22
Indoor unitOutdoor unit
Unit size 12 18 25
D (m) 15 15 22
L (m) 18 18 25
H (m) 12 12 20
Unit size 12 18 25
g/m 15 40 40
High pressure
Manifold
Gas valve
Liquid valve
Pressure
tap
Low pressure
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8
For details of indoor and outdoor unit wiring, see the diagram
supplied inside the units. Start the unit and check operation both
in cooling and heating mode.
Installing the "diffuser-grille" assembly
• Mounting
-Remove the return air grill by springing the 4 mounting clips
and 2 hinges (fig. 1, ref. a).
-Remove the air filter (fig. 2 & 3).
-Put the grill in place under the cassette chassis (fig. 4).
-Connect the panel heater wires.
-Fit the casing and grille together using the screws (fig. 5, ref. b).
- Put the filter (fig. 6) and the return air grille (fig. 6 & 7) back in
place.
8 - Wiring diagram
9 - Front panel installation
1NE 2
1NE A 2
Power supply
220V/1Ph/50Hz
Cooling only units - MKC
1NE 2
1NE A 2
3
3
Power supply
220V/1Ph/50Hz
Heat pump units - MKH
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Fig. 5
Fig. 4
Fig. 3
Fig. 2
Fig. 1
b
b
b
b
a
a
a
a
Wiring sizes
Unit size 12 18 25
Power supply mm23 x 2.5 3 x 4
Interconnection Cool. mm23 x 2.5 + ground 3 x 1.5 + ground
(Indoor/Outdoor) Heat. mm24 x 2.5 + ground 4 x 1.5 + ground
Fuse (Slow-blow) A 10 16 20
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9
Directing the airflow
With direct air discharge, pay particular attention to the direction
in which the air is discharged.
•Air deflectors (ref a)
These deflectors should be directed so that a maximum volume is
given to the envelope of the airstream. Below, the diagram shows
the optimum position required to acheive the best possible airflow
performance.
• Integral diffuser
In the cooling mode, cool air is discharged horizontally just below
the ceiling, ensuring even air distribution in the room due to the
«coanda» effect without causing drafts.
In the heating mode, airflow can be directed so as to prevent stag-
nation at certain places in the room (stratification of hot air).
9 - Front panel installation (cont’d)
Fig. 7Fig. 6
a
a
aa
A
Cooling operation (summer)
Coanda effect
Heating operation (winter)
Detail A
Depending on the configuration of the room to be air conditioned,one or two of the deflectors may be left closed.
Summer position
Winter position
YES YES NO
Depending on the layout of the conditioned space, 1 or 2 dampers may be closed. This is necessary for air discharge through a
discharge satellite into an adjacent room or when the cassette unit is installed too close to a wall.
Operation in heating mode only : Although the unit has an anti-stratification
function, it may be necessary to offset the return air sensor setpoint, in cases
where ceilings are particularly high for example. This can be done with the two
microswitches on the control board. Setpoint offsetting is only effective in the
heating mode and has no effect on the cooling mode.
Temp. Switch
difference °C 2 1
0 OFF OFF
1 OFF ON
3 ON OFF
5 ON ON
1 2
ON
OFF
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10
11 - Technical appendix
10 - Maintenance
The units are designed to operate for long periods of time with a minimum of maintenance. However, the following operations must be
performed regularly.
Component Maintenance operation Recommended frequency
Air filter 1 - Clean with a vacuum cleaner or tap gently then Every month or more
wash in warm water (40°C) with a mild detergent. often if necessary.
2 - Rinse and dry before replacing on unit.
3 - Never use petrol, alcohol or any other chemical
product.
Unit casing 1 - Remove dust from the front panel with a soft duster Every month or more
or wipe a damp cloth with a mild soap solution. often if necessary.
2 - Never use petrol, alcohol or any other chemical
product.
Drain pan and 1 - Clean and check for obstructions. Each season before start up.
evacuation piping
Indoor / outdoor coils 1 - Check condition and remove dust from between Each season before start up.
coil fins.
Compressor 1 - No maintenance required.
ALL OTHER SERVICE AND MAINTENANCE OPERATIONS MUST BE PERFORMED BY TRAINED
AND QUALIFIED PERSONNEL APPROVED BY THE SUPPLIER
Unit Capacity
Total cooling capacity can be determined by using correction fac-
tors C1, C2 and C3.
Given cooling capacity = Cooling capacity at standard rating
conditions x C1 x C2 x C3.
C1 = Capacity correction factor for temperature
C2 = Capacity correction for piping length
C3 = Capacity correction for indoor unit fan speed
Capacity correction factor for temperature (C1)
*Conditions applicable for the "Low ambient line" / +19°C for the "Export
line".
Correction factors (C1) determine the instantaneous capacity (which
does not take account of defrosting on heat pump units). These
capacities may vary slightly, depending on the size of the unit.
Cooling capacity correction factor
Indoor temp. Outdoor temp. °C DB
°C WB 19 25 30 35 40 46
23 - 1.20 1.15 1.11 1.06 1
19 1.10 1.08 1.04 1 0.96 0.90
14 0.88 0.86 0.84 0.82 0.79 0.74
Heating capacity correction factor
Indoor temp. Outdoor temp. °C WB
°C DB 14 10 6 0 -8
23 1.20 1.04 0.96 0.77 0.58
20 1.25 1.10 1 0.80 0.69
17 1.30 1.13 1.04 0.83 0.63
Maximum Minimum
Cooling mode +46°C 0°C
(-10 with fan stoppage)
Heating mode +28°C -10°C
(heat pump mode)
Unité intérieure
Fan speed High Medium Low
Correction factor C3 1 0.90 0.75
Capacity correction factor for indoor fan speed (C3)
Capacity correction factor for piping length (C2)
Operating temperature limits
Indoor unit
Piping length (m) 7.5 10
Correction factor C2 1 0.98
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