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Diaphragm type. It is recommended that the condensate pump has the facility so it only
operates when the air curtain is in cooling mode by detection of water in the drain tray or
by detecting a cooling differential in the airflow. It should also have a pump overrun to
empty the drain tray as much as possible when the air curtain is switched off. We
recommend the Blue Diamond rotary diaphragm type with cooling signal sensor (drainStik)
manufactured by Charles Austen Pumps Ltd. (www.miniblue.co.uk).
Table 4
HX2-S/M 1000 DXE
HX2-S/M 1500 DXE
HX2-S/M 2000 DXE
HX2-S/M 2500 DXE
There is space inside the air curtain at the right hand end of the unit to mount a
condensate pump. A permanent 230V AC, single phase electrical supply is provided inside
the air curtain at the DIN-Rail terminals to power the pump. See Wiring Diagrams. There
are two 20mm condensate outlet holes in the casing, one at the top of the unit and a lower
one at the rear, both fitted with rubber plugs (see Figure 2). These can be used to feed a
hose from the condensate pump to a remote condensate drain.
Condensate drain hose should be pushed through either of the two condensate outlet
holes after removing the plug and connected to the condensate pump using the adapter
supplied with the pump. It may be necessary to extend the hose if the pump is remotely
located.
Whether a gravity drain system or a condensate pump is used to remove the condensate
there should be an alarm system with appropriate sensor fitted in the drain tray that will
give a volt-free signal (closed circuit = alarm). A 2-wire condensate alarm signal should be
wired back to the condensate alarm connection provided at the Interface PCB inside the
air curtain. This will stop the air curtain cooling if the condensate drain tray is in danger of
flooding, bringing up an error code on the Mitsubishi Electric system (air curtain fans will
continue to operate).
There is a fixing bracket with 8mm diameter hole attached to
the drain tray inside the air curtain so a condensate alarm
sensor can be fixed in the tray by the installer. Hinge the drain
tray down to gain better access to the fixing bracket (see
picture and Section, Servicing). Enlarge the hole if necessary
to suit the type of sensor being used so it is located in the tray
at the appropriate position. If a condensate pump is being
used see the manufacturer's instructions that come with the
pump for further information.
T9901105-1-1 UK
Air Curtain
Maximum likely condensate flow rate
(litres/hour)
S = 4.9
S = 8.1
S = 9.4
S = 13.1
M = 6.2
M = 9.8
M = 12.2
M = 15.3
Page 21 of 42
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