T9901105-1-1 UK
Page 20 of 42
Wiring of Air Curtain Fan Speed
As delivered the air curtain is link wired to operate on a single fan
speed at its medium speed, see picture opposite. Current thinking
for air curtain technology, however, is to have a Door-Switch wired
to switch the unit between a Higher fan speed - Door Open and a
Lower fan speed - Door Closed. This is both energy efficient and
noise friendly. Alternatively a single fan speed, High, Medium or
Low, can be set at commissioning to suit the general weather
conditions of the site. Both methods prevent the end user
switching fan speeds and maybe leaving the air curtain on an
unsuitable setting.
If the end user does require remote fan
speed switching, however, there is a wall
mounted 3-speed fan switch supplied with
the air curtain which can be fitted next to the
Mitsubishi Electric PAR-W21MAA or PAR-
31MAA Remote Controller. The end user
can then remotely select High, Medium or Low fan speeds if they choose to.
A door switch, wire link for single speed or the 3-speed fan switch is wired to terminals
FAN, HIGH, MED and LOW in the Air Curtain using 230V mains rated double insulated
cable of size 0.75mm
2
. See Wiring Diagrams and Section, Commissioning; ‘Selecting the
fan speeds of the air curtain’ which gives details as to how the available speeds of the five
speed fan motor(s) can be set to suit outdoor environmental conditions and indoor noise
levels.
Condensate Disposal System
Cooling is only possible if the air curtain is modified during commissioning to operate
under
Inlet Air Temperature Control
or
Room Air Temperature Control
. It will not
operate in cooling if set-up to operate under
Weather Compensation Control
or
Discharge Air Temperature Control
, which is how the air curtain is supplied.
If it is intended to use the air curtain in cooling mode the plug must be removed from CNX5
on the PAC-IF010 Interface PCB (see Wiring Diagrams) and a condensate disposal
system must be installed.
The air curtain is fitted with a condensate drain tray with 15mm
copper outlet pipe at the right hand side of the air curtain.
Suitable condensate hose can be fitted to the pipe (see
picture) and fed through a 20mm hole at the back of the unit,
see Figure 2, so condensate will gravity drain away. Means of
condensate disposal must then be provided at the rear of the
air curtain.
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 4)
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
