Marstair 526 HL Series, Technical Manual, Page: 8 / 31

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HL/HLR Installation
An envelope containing important user information is supplied with the indoor unit. Please pass this to the end user.
Indoor Unit Cabinet Removal
1. Press the filter tray at both sides to spring it and the filter out (Fig.1).
2. Remove the two outer self tap screws then release the quarter turn fasteners.
3. Pivot the cabinet forward from the bottom and lift upwards to clear the
chassis top flange and remove, this will reveal the polystyrene fan scrolls
which should
NOT be removed.
Fig. 1
Weight (kg)
HL/HLR 380 61
HL/HLR 460
62
HL/HLR 540 69
4. The unit is shipped with a bracket to protect the
motor during transit. Remove and discard
the bracket, and fit the motor wiring plug and
socket as shown.
Mounting
1. It is generally easier to fit kits prior to mounting the unit and brazing the pipework.
2. Ensure that the wall or ceiling will accept the operating weight of the unit.
3. Mark off the mounting holes as Fig.2 and drill holes to suit M6 rawlbolt shields or equivalent fasteners.
Allow 130mm minimum from ceiling to holes for cabinet removal on wall mounted units.
Allow 150mm at the base plate (wall or ceiling mounted) to maintain design airflows.
4. If a fresh air facility is required, apertures must be prepared as shown in Fig.2. This must be suitably lined and screened
on the internal wall to prevent brick dust from entering the unit, (apertures are 35mm high), filters are fitted as standard.
5. Mount the unit and secure the fixings. On ceiling mounted units two extra holes are provided for screws to prevent
movement on the keyhole slots.
6. Check the unit is square and level. Use the extra self tap screws to additionally secure ceiling mounted cabinets.
Fig. 2
Model 'A' 'B' 'C' 'D'
No. of
air inlets
No. of
spaces
HL/HLR 380 961 921 461 250 2 1
HL/HLR 460 1111 1071 536 300 2 1
HL/HLR 540 1311 1271 626 240 3 2