The unit must be installed with the drain
tray tilted about 10 mm along its length so
that the drain connection is at the lowest
point.
When finally positioned, tighten the lock
nuts on the mounting rods from above and
below the mounting flange to give a firm
installation (see Fig. 3).
Condensate Drain
The condensate drain should be trapped
outside the unit cabinet. The trap should
have a vertical height of at least 50 mm.
The drain should have a slope of at least
1 in 50 and must not be piped to a level
above the unit drain tray. (Refer Fig.4).
For long condensate pipe runs, fit a vent
pipe near the drain trap. The top of the vent
pipe must be at least 100 mm above the
ISD unit's drain tray.
It is essential that the drainage system for
the evaporator is checked by pouring water
in the drain tray and seeing that it
discharges at the end of the drain and does
not overflow the drain tray.
INDOOR-OUTDOOR UNIT
CONNECTIONS
Refer to the relevant OSA Outdoor Unit
'Installation & Maintenance' pamphlet for
piping instructions. For wiring connections,
refer to the Outdoor Unit wiring diagram in
conjunction with the ISD wiring diagram on
this pamphlet.
REFRIGERATION PIPING
Pipe Connection Sizes
& Type
Liquid :
13 mm OD (
1
/
2
") flare
Suction :
28 mm OD (1
1
/
8
") sweat
The ISD is shipped from the factory with a
pressurised holding charge of nitrogen.
STRAIGHT
PIPEWORK
400 mm
MINIMUM
SUPPORT PIPEWORK
AT THIS END
Pipework Connection
Fig. 5
Immediately before removing any brazed
pipe connection's seal, reduce holding
charge to atmospheric pressure by
loosening flare nut pipe connection.
Warning
: failure to do so may cause injury.
Allow a minimum of 400 mm straight
pipework directly out from where the pipes
exit the unit (Fig.5). This is will permit
easier access for future servicing.
Refer to the Outdoor Unit 'Installation &
Maintenance' pamphlet for evacuation
procedure and piping requirements.
ELECTRICAL WIRING
The electrical supply required (via the
Outdoor Unit) is specified on the Outdoor
Unit's wiring diagram.
Electrical work must be carried out by a
qualified electrician in accordance with
local supply authority regulations and the
wiring diagram.
In a free blow or low resistance application,
beware of exceeding the fan motor's full
load amp limit (refer Outdoor Unit's wiring
diagram).
It is recommended electricians run two
spare wires between Outdoor Unit and
Indoor Unit in case one or both of the
following options becomes a requirement.
Note
: Leave the wires unconnected until
required.
Option 1. Indoor Fan Off During De-Ice
(Reverse Cycle Systems only)
Connect one of the spare wires mentioned
above and remove the loop wire from
terminal 'N' to terminal '1'.
Option 2. Electric Boost Heat.
Connect one of the spare wires mentioned
above from Indoor Unit terminal '18' to
Outdoor Unit terminal '18'.
INDOOR FAN SPEED
The fan speed can be set to LOW, MED, or
HIGH - whichever best suits the
application.
If the air returning to the indoor unit is
regularly expected to be above 50%RH,
then the coil face velocity should be limited
to be 2.5 m/s or less (refer Air Handling
graph in Technical Data pamphlet).
High humidity levels can occur in tropical or
subtropical conditions, and/or when heavily
moisture laden fresh air is introduced.
Select a fan speed that avoids water carry-
over problems.
THERMOSTATS
For options, refer to the
temperzone
pamphlet 'ISD 73Q-300Q - Approved
Thermostats' Data Sheet. A dedicated
neutral line is required where electronic or
anticipator thermostats are used when you
choose to have indoor fan off in de-ice.
COOLING OPERATION
An Outdoor Unit HP Fan Speed Controller
(4 amp), available from
temperzone
, is
recommended where indoor cooling is
required at ambient conditions below 20
°
C.
COMMISSIONING
Indoor Unit
1.
Check that the thermostat is correctly
wired and set at the desired
temperature.
2.
Check that the air filter (if fitted) is
clean.
3.
Check that the fan runs freely without
vibration.
4.
Check condensate drain for free
drainage.
5.
Run the unit in cooling and heating
modes.
MAINTENANCE
Weekly For First Four Weeks
1. Check air filter (if fitted); vacuum clean
as necessary.
2. Check condensate drain for free
drainage.
Monthly
Check air filter (if fitted); vacuum clean as
necessary.
Six Monthly
1. Check condensate drain for free
drainage.
2. Check heat exchanger coil; vacuum or
brush clean as necessary.
3. Check the tightness of the fan.
4. Check that fan motor is free running.
5. Check tightness of electrical
connections.
6. Check air supply at diffuser outlets.
WARNING
This unit is designed for use ONLY with the
refrigerant HCFC-22. The use of other
refrigerants is NOT authorised or approved
by the manufacturer and may cause
operational problems such as poor
performance and efficiency, loss of
capacity, degradation of materials and
refrigerant leaks.
The use of flammable or explosive
materials as a refrigerant creates the
additional risks of fire and explosion
which may result in property damage,
personal injury or death.
Condensate Drain
Fig. 4
OPEN
DRAIN
MINIMUM
SLOPE
20 mm PER m
(1 IN 50)
50 mm
MINIMUM
100 mm
APPROX.
'U' TRAP
100 mm
APPROX.
VENT PIPE
FOR LONG
CONDENSATE
DRAIN RUNS
