ISD 250Q, 300Q – 470Q
Ducted Split System
Indoor Units
Installation &
Maintenance
GENERAL
These ISD indoor units are designed to be
coupled with their respective OSA outdoor
units. Units must be installed in
accordance with all national and local
safety codes.
Combinations
One ISD 250Q with one OSA 240RA
One ISD 250Q with one OSA 250
One ISD 300Q with one OSA 290RA
One ISD 300Q with one OSA 300
One ISD 390Q with one OSA 390
One ISD 390Q with one OSA 410RA
One ISD 470Q with one OSA 480
Options
1. Filter Box.
2. Spring Mounting Kit
3. Electric Heat Kit.
FILTER BOX (Option)
The Filter Box is installed by unscrewing
the return air spigot and replacing it with
the Filter Box's filter-integrated spigot. The
filter may be accessed from either side of
this spigot. This new spigot has a depth of
150 mm, instead of 65 mm.
ISD c/w ELECTIC HEAT OPTION
(Factory Fitted)
Units supplied with electric boost heat are
designed to conform to AS/NZS 3350.2.40
1997.
ISD 250Q–390Q: 3 x 3 kW elements
ISD 470Q: 3 x 4 kW elements
Note: Reverse Cycle systems fitted with
electric heat require an Outdoor Unit low
limit t/stat (supplied separately).
UNPACKING UNITS
In an area adjacent to the installation site
remove from the ISD unit from its carton
and examine it carefully for any damage
which may have occurred in transit. Record
any damage on the carrier's delivery
documents and refer the matter
immediately to the manufacturer's nearest
Sales Office.
INSTALLATION
Positioning & Mounting
Provide 500 mm minimum clearance to the
electrical panel. If the filter box option is to
be used, allow adequate clearance for the
two half length filters to be withdrawn from
either side of the unit.
If low noise is a critical factor in the
installation, refer to Figure 6 for noise
isolation recommendations.
It is recommended that the unit be mounted
using the spring mounting system, supplied
as an optional extra (Fig.3). This system
minimises transfer of vibration into the
building structure.
Fig.1 Dimensions (mm)
Not to Scale
ELECTRICAL
ACCESS PANEL
REFRIGERANT
CONNECTIONS
F
A
OVERALL
H
MOUNTING CENTRES
G
80
DRAIN 28 OD
E
C
688
OPTIONAL
SPRING MTG
CENTRES
ELECTRICAL
CONDUIT HOLES
6565
B
OVERALL
735 OA
FAN ACCESS VIA
REMOVEABLE BASE
& DRAIN TRAY
ACCESS
PANEL
W
X
Y
Z
D
600
MOUNTING
STRAP
CENTRES
J
K
Net
Weight
ISD 250Q 120 kg
ISD 300Q 120 kg
ISD 390Q 175 kg
ISD 470Q 182 kg
MODEL A B C D E F G H J K
ISD 250Q 1625 575 975 300 240 1375 425 1518 125 325
ISD 300Q 1625 575 975 300 240 1375 425 1518 125 325
ISD 390Q 1680 700 1030 310 365 1430 555 1573 125 325
ISD 470Q 2060 700 1525 310 299 1705 555 1915 170 165
Fig. 2
Note: The manufacturer reserves the right to change specifications at any
time without notice or obligation. Certified dimensions available on request.
CORNER LOADS (kg)
WX Y Z
29 35 31 25
29 35 31 25
37 41 32 35
41 50 50 41
MODEL
ISD 250Q
ISD 300Q
ISD 390Q
ISD 470Q
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
UNIT
Condensate Drain
PROJECTION
If a more rigid installation can be tolerated,
then suspend the unit using the four
mounting straps supplied, as shown in
Figure 4.
Alternatively, the unit can be mounted on a
suitable platform using vibration isolators.
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.
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.2).
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
ISD 250Q – 390Q :
Liquid : 16 mm OD (5/8") sweat
Suction : 28 mm OD (11/8") sweat
ISD 470Q :
Liquid : 19 mm OD (3/4") sweat
Suction : 35 mm OD (13/8") sweat
The ISD is shipped from the factory with a
pressurised holding charge of nitrogen.
Immediately before removing any brazed
pipe connection's seal, reduce holding
charge to atmospheric pressure using the
Schraeder valve provided on th suction
line.
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.4). 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).
Reverse Cycle Systems Only
– To make
the indoor fan switch off during de-ice
cycle, refer to the Outdoor Unit wiring
diagram for the appropriate changes.
ISD/OSA Systems with Electric Heat
Replace the systems external fuse with the
size recommended in the table below and
mark the change on the Outdoor Unit's
wiring diagram.
Outdoor Unit Replacement Fuse Size
OSA 250 40 A
OSA 260 A 40 A
OSA 290 A 50 A
OSA 300 50 A
OSA 390 60 A
OSA 410 A 60 A
OSA 480 80 A
INDOOR FAN SPEED
The fan speed can be set to LOW, MED, or
HIGH - whichever best suits the
application.
COOLING OPERATION
An Outdoor Unit HP Fan Speed Controller,
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 any 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.
Indoor Unit with Electric Heat
Test the air safety switch by running
the fan on its lowest speed and
checking for electrical heating. Remove
power to the fans and the electric
elements should cut-out.
OPERATION
Units installed with electric heat kits
includes both auto (90°C) and manual
(120°C) high temp. safety thermostats. If
the manual high temp. safety t/stat requires
resetting and the auto high temp. safety
t/stat does not reset, then the latter needs
to be replaced.
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.
NOTE
The manufacturer reserves the right to
change specifications at any time without
notice or obligation. Certified dimensions
available on request.
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.
Fig. 3 Spring Mounting
STRAIGHT
PIPEWORK
400 mm
MINIMUM
SUPPORT PIPEWORK
AT THIS END
Pipework Connection
Fig. 5
This pamphlet replaces the previous
issue no. 2231 dated 06/03.
Fig.1 Dim. 470.
Fig. 4 Strap Mounting
ADJUSTABLE
MOUNTING STRAP
SUPPLIED (1 OF 4)
SCREWS
SUPPLIED
RECOMMENDED
MOUNTING
SYSTEM
(OPTIONAL
EXTRA)
Recommendations for Noise Isolation
- particularly for high static installations:
1. Avoid installing units, with non-ducted return air, directly above
spaces where noise is critical.
2. Use flexible connections between unit and rigid ducting.
3. Use generously sized acoustically lined ducts.
4. If generous duct size is not possible, use turning vanes on bends
to reduce air turbulence (regenerated noise).
5. Use 90° bends in ducting to significantly assist in noise reduction.
Fig. 5 Application Considerations
11/06 Pamphlet No. 2682
© temperzone limited 2006
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