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Refrigeration Installation
1.
The refrigerant connections are terminated on the left hand side of the indoor coil and the lower front of the right end
panel on outdoor units; (indoor units are brazed connections, outdoor units are flare fittings).
Units are supplied with the following pipes: (HL are the same as HLR models; MCU+ are the same as MCU models).
HLR 380 HLR 460
Expansion
1/2"
5/8"
Suction
2.
Using a tube cutter, remove sealed ends of suction and expansion pipes on the indoor unit. This will release a small
holding charge of dry nitrogen.
3.
Pipe exit will normally be via knockouts in the base or cutouts in the back panel.
Alternatives are:
For top left hand exit, turn your pipework through 180° and exit via the gap provided in the back panel. The cabinet
will need to be locally notched as Fig. 3 - do not completely cut away as this will weaken the structure.
BOTTOM RIGHT HAND EXIT can be achieved by running pipework underneath the scroll attached to the back panel.
Remove the lower grille (4 screws) for access, fit suitable lengths of insulation to the pipework and braze in. It is
recommended that the liquid and suction lines be kept to ½" and 5/8" respectively until exit, when the full pipe size can
be run. Exit is preferably made via notches to be cut to suit in the right hand side panel.
4.
It is recommended that the drip tray is removed during brazing to prevent if being melted. Remove the top two screws
on the front scroll, and remove drip tray and the support bracket together.
5.
Connect pipework between units ensuring:
a)
Only refrigeration quality copper is used.
b)
The ends are capped on tubes and parts when not working on them to prevent moisture or dirt entering the
system.
c)
If pipes are brazed, use a copper phosphorous alloy containing 5% silver, ensuring that dry nitrogen is passed
through the components involved to prevent oxidation.
d)
The suction and expansion lines are fully insulated, including inside the cabinet of the indoor unit up to the drip
deflector. Bend pipework back to ensure it is over the drip tray; if in doubt, use non-drip tape.
e)
The system is leak tested and evacuated before final charging.
6.
If a sight glass is fitted to aid charging it must be positioned before the expansion device on the outdoor unit.
Condensate Drain
The condensate drain connection is at the left hand end of the drain tray. A ½" O.D. plastic drain pipe is provided in the
drain tray sump for connection with non-kink plastic tubing secured with a suitable clip. Should it be necessary for the
drain pipe to go through the bottom of the unit a knockout is provided at the left hand end of the base plate.
The drain line must have a constant fall to open drain using a ''U' trap if required. Check that the water will run freely and
that there are no leaks.
Details of ceiling mounted drain and fitting of optional condensate pump are provided on pages 25 to 27.
Discharge Grille position
The discharge grille is supplied for front down discharge. The alternatives are achieved by:
i)
Remove and retain grille and blanking panel screws (12 in total).
ii)
Slacken but do not remove all other fixing screws.
iii)
Remove blanking panel.
iv)
Remove grille.
v)
Slide blanking panel into new position and fix.
vi)
Clip panel location bracket under return edge of blanking panel and screw down into return edge of front panel.
HLR 540 MCU 90 MCU 100 MCU 130 MCU 165 MHPUE 90 MHPUE 100 MHPUE 130
1/2"
1/2"
1/2"
5/8"
5/8"
5/8"
1/2"
1/2"
1/2"
3/4"
3/4"
3/4"
-12-
1/2"
1/2"
1/2"
3/4"
3/4"
3/4"
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