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If it is not practical to gravity drain from the air curtain a suitable condensate pump (not
supplied with the unit) can be supplied and fitted by the installer to remove condensate
directly from the unit. The condensate pump must be of sufficient capacity (see Table
below) and if located higher than the drain tray; self priming and capable of providing the
appropriate suction head so the pump will lift condensate out from the top of the air
curtain. Suitable condensate pumps with a suction head are Peristaltic or Rotary
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 3
VRF HP1000 DXE
VRF HP1500 DXE
VRF HP2000 DXE
VRF HP2000 DXE (HO)
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 1, Page 11). 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 (open 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). Other indoor units on the same City Multi system are unaffected if the
air curtain condensate alarm occurs.
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 – Page 33). 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 manufacturers instructions that come with
the pump for further information.
T9901075-2-3 UK
Air Curtain
Maximum likely condensate flow rate
(litres/hour)
6.0
9.0
11.0
13.0
Page 22 of 38
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