Marstair CWW 15 User manual

Installation Instruction 96908015-03
Page 1 of 4.
CWW CHILLED WATER WALL MOUNTED UNIT INSTALLATION
The CWW CHILLED WATER wall mounted unit may be installed at low or high level.
The installer supplies:
*4 off M6 (or equivalent strength) Rawlbolt shields, bolts and washers.
*Insulated pipework.
*All mains wiring with suitable isolation.
*Condensate drain (Minimum 10mm bore for gravity drain, 8mm bore when fitted with a condensate pump).
*A cross-headed screwdriver for releasing the end cover fasteners.
*Method for securing solid sheathed cables if these are used.
Unpacking
Carefully unfasten the banding and lift off the outer cardboard carton sleeve.
The following are supplied:
*CWW unit (in protective sleeve, held between two polystyrene end caps).
*Two cable glands suitable for flexible, pre-sheathed cable.
*A wall mounting bracket also held between the two polystyrene end caps.
*Envelope containing operating instructions to be left with the end user.
1Lift the CWW unit from the inner cardboard sleeve complete with the two polystyrene end
caps; (this will require 2 people for sizes 55 to 85).
2Remove the wall mounting bracket and carefully remove the two polystyrene end caps
and the protective sleeve from the CWW unit.
3Remove both end covers by removing the self tapping screws, one on each end trim.
By pulling the end covers sharply they can be removed from the backpanel and fascia.
Chassis Mounting
NOTE: It is generally easier to fit kits prior to mounting the unit and connecting the pipework.
1Ensure that the wall is flat and will support the operating weight of the unit, (see below).
2Ensure that sufficient access is left around the unit for future kit fitting, servicing and maintenance, (Fig. 1).
Model Weight
kg
Operating
Weight*
kg
15 14 15
35 20 21
55 24 25
75 30 32
85 34 36
*Includes all kits and water
Fig. 1.

Installation Instruction 96908015-03
Page 2 of 4.
3Mark out the two required top hole centres as shown in Fig. 2, (note that the top of the CWW unit will be
approximately 100mm above the level of the hole centres). Drill to suit M6 Rawlbolt shields or equivalent strength
fasteners. Secure the wall mounting bracket to the upper two holes ensuring that it is level.
4Hang the unit on the two protrusions from the wall mounting bracket and, ensuring that the unit is level, mark out and
drill the lower two holes and secure the unit to the wall.
Model1535557585
A1 445 745 1045 1345 1645
A2 395 695 995 1295 1595
A3 345 645 945 1245 1545
B370 370 370 370 370
C340 340 340 340 340
D31 31 31 31 31
E29 29 29 29 29
Fig. 2.
PIPE CONNECTIONS
Pipework is terminated with end caps at the left hand side of the unit. All pipework is 15mm copper water pipe.
For rear pipe exit, connect direct to the Chilled Water and LPHW coil inlet/outlet pipes
For bottom pipe exit, cut back the Chilled Water coil inlet/outlet pipes by 25mm and connect elbows/fittings. Connect direct
to the LPHW coil inlet/outlet pipes.
For top pipe exit, cut back the LPHW coil inlet/outlet pipes by 25mm and connect elbows/fittings. Connect direct to the
Chilled Water coil inlet/outlet pipes.
Ensure that the Chilled Water pipes are insulated up to the header.
ELECTRICAL CONNECTIONS
All mains and control cables must be supplied and fitted by the installer.
The installer wiring must be carried out in accordance with IEE regulations and local codes.
All cables must be size compatible with the recommended fuse for a given system.
An isolator switch should be positioned within easy reach of the indoor unit.
The equipment MUST be earthed.
Cable glands suitable for stranded cables are supplied and should be used to secure all cables. Installers must supply a
method of securing any solid sheathed cable.
FUSE SIZES (Amps)
Model 15 35 55 75 85
FuseSize 55555
Condensate Removal
Condensate is collected in a drip tray which runs along the full length of the coil.
An outlet pipe is provided at the rear left hand end of the tray for connection to a pipe for gravity drain.
Slide the outlet pipe from the clip and exit the unit vertically through the hole in the backpanel or base into a suitably sized
gravity drain.
Once a gravity drain has been installed, check to ensure that the pipe is not kinked and that correct drainage occurs by slowly
filling the drip tray with water.
A condensate pump kit which fits within the unit is available; this also provides overflow protection.

Installation Instruction 96908015-03
Page 3 of 4.
Air Deflection
Air deflection is set by manually adjusting the vanes. The unit is supplied with front discharge but can be changed to top
discharge as follows.
1Remove the filters.
2Remove the end covers.
3Using a screwdriver or thin bladed
tool, release the three tabs at the
bottom of the top box; these are
directly below the centre and two end
vertical vanes.
4Lift the top box assembly from the
unit.
5By gently flexing the top box sides
from the rear, transfer the deflector
plate from the upper to the lower two
fixing holes.
6Rotate the top box assembly and refit
to give top discharge.
CWW WIRING DIAGRAM
KEY
ABBR MEANING
BBROWN
RRED
OORANGE
YYELLOW
GGREEN
BL BLUE
GRY GREY
WWHITE
BK BLACK
PPINK
M1 MOTOR FAN
M2 PUMP
PCB1 CONDENSATE CONTROL
RT REMOTE THERMOSTAT
FFUSE
S1 CONDENSATE SENSOR
CCAPACITOR
V1 VALVE COOL
V2 VALVE HEAT
CC CONTROL

Installation Instruction 96908015-03
Page 4 of 4.
CWW OPERATING INSTRUCTIONS using Speed Selector Switch and Thermostat
The switches to operate the fan speed and thermostat control are located behind the door in the right hand end cover. Press
the door at the right hand side and swing it outwards to reveal the two knobs.
The upper knob selects temperature, which is automatically
controlled by an internal thermostat that senses return room air.
Lower room temperatures can be maintained by turning the knob
clockwise, further into the blue shaded area. (Minimum is
approximately 19°C room temperature).
Similarly, higher room temperatures can be maintained by turning
the knob anticlockwise, further into the red shaded area.
The lower knob selects the fan speed required, or the Off position.
Knob Position
Effect
Upper Lower
Any 0Unit Switched Off
As
Set 2
Minimum fan speed with auto
control for normal room
temperature and lowest sound
level
As
Set 3Medium fan speed with auto
control
As
Set 4
Maximum fan speed giving
rapid change of room
temperature
NOTE: Heating is only possible if a Low Pressure Hot Water Coil has been fitted.
USER MAINTENANCE
Isolate at the mains supply before commencing any maintenance work.
THE UNIT SHOULD ALWAYS BE USED WITH A FILTER
In order to maintain efficiency it is important that the filters behind the air intake grilles are
cleaned regularly. This will normally be every two or three weeks.
The filters should be removed from the bottom of the grille on high level units, or from the top
of the grille on low level units. Carefully slide each filter from behind the air intake grille. Wash
the filter (with tepid water only) and dry before use. Alternatively tap the filter gently to remove
dust.
Marstair Ltd.
Armytage Road, Brighouse,
West Yorkshire. HD6 1QF.
Tel: [phone].
Fax: [phone]
Email: [email protected]