Marstair CWW-L User manual

Installation Instruction 96908038-03
Page 1 of 4.
CWW-L CHILLED WATER WALL MOUNTED UNIT INSTALLATION
The CWW CHILLED WATER wall mounted unit may be installed at low or high level. To operate the unit the end user
will require an electronic remote control (available separately, part number 55500309). This control will operate any
number of 'L' units individually.
The installer supplies:
*4 off M6 (or equivalent strength) Rawlbolt shields, bolts and washers.
*Insulated pipework.
*All mains wiring with suitable isolation.
*Condensate drain (8mm diameter).
*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-L 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.
1. Lift the CWW-L unit from the inner cardboard sleeve complete with the two polystyrene end
caps; (this will require 2 people for sizes 55 to 85).
2. Remove the wall mounting bracket and carefully remove the two polystyrene end caps and
the protective sleeve from the CWW-L unit.
3. Remove 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.
1. Ensure that the wall is flat and will support the operating weight of the unit, (see below).
2. Ensure 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 96908038-03
Page 2 of 4.
3. Mark out the two required top hole centres as shown in Fig. 2, (note that the top of the CWW-L 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.
4. Hang 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 1535557585
Fuse Size 55555

Installation Instruction 96908038-03
Page 3 of 4.
PCBA CONFIGURATION
For use in CWW-L systems, with or without an LPHW coil fitted, the pcb is factory set with the programming plug (JMODE)
already removed - no reconfiguration is needed.
Fig. 3 Indoor board (factory configured for CWW-L systems - no plug on JMODE)
INCORRECT PROGRAMMING
If the unit has been powered whilst incorrectly programmed, turn the power OFF then ON again.
REMOTE CONTROLLER.
CWW-L indoor units use an electronic remote control (available separately, part number 55500309 ).
The controller operates remotely by infrared signals and the bracket should be used to park the controller for
convenience.
Infrared operation
Open the battery cover at the bottom rear of the controller by sliding out. Insert the batteries, (check polarity),
momentarily bridge the two reset contacts (exposed with the battery cover open), with a metal blade, the display will blank
and reset, then close the cover. The controller is now ready for operation as stated in the user handbook. For
convenience, the wall mounting bracket may be secured to a wall and used to park the controller.
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 tray.
For connection to an 8mm i.d. flexible pipe, remove the length of pipe supplied and connect direct to the drain stub.
Ensure that the drain pipe is kept below the rim of the drip tray along its entire length.
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.