OPA 2000RKTM01
Packaged Reverse Cycle R410A
Air Cooled Air Conditioner
GENERAL
This OPA 2000RKTM Outdoor Unit must be
installed in accordance with all national and
local safety codes.
REFRIGERATION SYSTEM
General
The OPA 2000 has four independent
refrigeration circuits and four compressors
to provide the exibility and economy of
four stage operation, i.e. utilising one or
more circuits as conditions vary, plus the
advantage of staggered starting.
Each refrigeration system has been charged
with HFC-410A (R410A) refrigerant; refer
wiring diagram specication table for
amount. Tapping points are provided to
measure discharge and suction operating
pressures.
Compressors
The compressors are directional scroll
type. The compressor lubricant is polyol
ester oil (POE). Note, this oil absorbs
moisture quickly if exposed to open air.
On commissioning, the compressors must
be checked for correct rotation (refer Start
Up Procedure). A time delay prevents
simultaneous starting of the compressors.
ECONOMISER (Option)
If the outdoor air temperature or heat
content preferably, is below that of the return
air the fresh air damper opens and the return
air damper closes to provide the rst stage
of cooling. A spill air facility in the building
may be necessary for when the return air
damper is closed. The fresh air damper
should return to minimum setting and the
return air damper open before compressors
are allowed to operate to provide further
cooling.
INSTALLATION
Positioning
Refer to dimension diagrams for minimum
clearances. If multiple units are to be placed
side-by-side then allow at least 2 m between
coil faces.
Mounting
The unit should be fastened to a rm at
horizontal base using the holes supplied in
the mounting channels.
When the unit is being installed on a roof it
is recommended that the unit is installed on
a substantial structure with vibration isolating
springs beneath the unit. These springs are
not supplied with the unit.
Flexible duct connections are recommended
between the supply and return ducts and
the unit.
Condensate Drain
The condensate drain should be 'U' trapped
outside the unit. The trap should have a
vertical height of at least 100 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 pipe.
OPEN
DRAIN
VENT PIPE
FOR LONG
CONDENSATE
DRAIN RUNS
100 mm
APPROX.
100 mm
MINIMUM
200 mm
APPROX.
'U' TRAP
Electrical Requirements
Electrical work must be done by a qualied
electrician. The outdoor unit must be wired
directly from a distribution board by means
of a circuit breaker or H.R.C. fuse, and a
mains isolator provided - preferably close to
the unit.
Note: DO NOT USE REWIRABLE FUSES.
The OPA 2000 is provided with a 24V AC
control circuit for a thermostat, on/off switch
and/or time clock.
The control transformer 240V primary
voltage is used for countries with 230-240V
power supply. For countries with supply
voltages 200-220V, change the primary
voltage on the transformer to 208V.
Standard units are suitable for use with
thermostats with either manual Heat/Cool
selection or automatic changeover subject
to the contact ratings of the thermostats.
A 24 hour power supply to the control circuit
is required, otherwise the warranty is void.
CHECK TESTS
1. Check that the shipping block beneath the
compressor has been removed and that
the compressor is secure on its mounts.
2. Check by hand that all fan motors can
turn freely.
3. Check that the air lters have been
correctly installed, if tted.
4. Check air diffuser dampers are open if
appropriate.
5. Check that the thermostat, or external
24V controller, is correctly wired to the
unit and is set at the desired temperature.
6. Check the tightness of all electrical
connections and sign the check label.
7. Leave the thermostat, or external 24V
controller, in the off position and close the
mains isolating switch. (A four hour delay
period is required to allow the crankcase
heater to drive any liquid refrigerant out of
the compressor oil.)
MINIMUM
SLOPE
20 mm PER m
(1 IN 50)
Installation &
Maintenance
8. Check the supply voltage between each
phase and neutral.
START UP PROCEDURE
After the four hour delay for the crankcase
heater has expired, use the supplied
Commissioning Sheet (Form NS 228) to
record results when completing the following
‘Start-up’ procedure. A UC6 Service
Interface tool is supplied to read, pressures,
superheat and its set-point, compressor
amps etc.
1. Select a sensible Fan speed (or Auto Fan
mode), operating cycle (cool or heat), and
room temperature set point, depending on
the time of year, such that the compressor
will start and run at a high capacity.
2. Turn ON the thermostat / External
controller. Wait for the compressors to
start.
3. Compressors tted are directional. Check
for correct rotation. If rotation is incorrect
the compressor will not pump, be noisy,
and will draw minimal current. To correct
motor rotation, change the phasing at
the main power terminal. If changing the
phasing, check the indoor air fan then
runs in the correct direction also.
3. Measure the current draw on each phase
to the compressor motors and measure
the current draw of each fan motor.
Check all readings against the specied
values in the wiring diagram.
4. Use the UC6 Service Interface tool to
check operating pressures and status. If
the UC6 Service Interface is not available,
t gauges and measure the suction and
discharge pressures of both refrigeration
circuits.
5. Check that the outdoor air fan motors are
running smoothly and drawing less than
the full load amps specied.
6. Test the operation of the reversing valve
by running the unit in both the heating
and cooling mode.
7. Check the supply air ow at each outlet.
8. Touch up any outdoor unit paintwork
damage to prevent corrosion.
SETTING SUPPLY AIR FLOW
Consult OPA 2000 Technical Data pamphlet
at www.temperzone.biz for details of airow/
duct static pressure, if required.
If the indoor air returning to the 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-
PROJECTION
over problems.
In a free blow or low resistance application,
beware of exceeding the fan motor's full
load amp limit (refer wiring diagram).
The indoor air fan motor is tted with
a factory set adjustable pitch pulley.
Instructions for the adjustment of pulleys is
included on the back page of the supplied
Commissioning Sheet. One revolution of
adjustment is equal to approx. 7% change in
air volume ow rate.
UNIT CONTROLLER (UC6)
The Unit Controller provides system
protection functions such as coil frost
protection, de-icing, high head pressure and
low suction pressure cut-out. It also protects
against rapid cycling of the compressor(s)
and loss of refrigerant. The UC regulates
the superheat of the refrigeration system
by controlling the position of an electronic
expansion valve (EEV). Various methods
of head pressure control (or limiting)
are employed in temperzone units. The
particular method used varies from model
to model, but is also handled by the Unit
Controller. In combination, these features
deliver optimised performance across a
wide operating temperature range.
As a result of the UC’s control of these
inter-related functions, the outdoor fans may
take some time to start rotating after each
compressor start. They may also run on
when the compressor stops. The fans will
stop during a de-ice cycle and the speed will
vary either smoothly, or in steps, in order to
protect against excessively low or high head
pressure.
Refer to UC6 Controller label on the unit for
operation & fault diagnostics information.
Many operating status conditions can be
deternined, without gauges, simply by using
the UC6 Service Interface graphical display
supplied with the unit.
MAINTENANCE
Monthly
1. Check air lters, if tted, and vacuum or
wash clean as necessary.
2. Check condensate drain for free
drainage.
3. Check compressor compartment for oil
stains indicating refrigerant leaks.
Three Monthly (or every 1200 hrs of operation)
Check the indoor unit's fan belt tension and
adjust if necessary.
Six Monthly
1. Check the tightness of electrical
connections.
2. Check the tightness of all fans, motor
mountings, pulleys and belt tension.
3. Check suction and discharge operating
pressures. (Using the UC6 Service
Interface avoids tting and removing
gauges with consequential refrigerant
loss.)
4. Replace indoor air lters (if tted).
5. Check condensate drain for free drainage.
Yearly
1. Check all refrigerant piping for chang
and vibration.
2. Check the operation of electric heaters,
if tted.
3. Check air supply at all diffusers.
4. Check for excessive noise and vibration
and correct as necessary.
5. Check for insulation and duct damage
and repair as necessary.
6. Remove lint and dust accumulation from
outdoor coil ns.
7. Touch up any paintwork damage to
prevent corrosion.
NOTE
The manufacturer reserves the right to
make changes in specications at any time
without notice or obligation. Certied data is
available on request.
This pamphlet replaces the previous
issue no. 3735 dated 05/14.
Wiring revision F & G.
DIMENSIONS (mm)
OPA 2000RKTM01 – Horizontal Supply & Return Air
1000 MIN. CLEARANCE
FILTER
ACCESS PANEL
FAN
ACCESS
DOOR
U V
ELECTRICAL
ACCESS
DOOR
2430 OA
1000 MIN. CLEARANCE
ELECTRICAL
ACCESS
DOOR
Z
OUTDOOR
AIR FLOW
OUTDOOR
AIR FLOW
2000 MIN. CLEARANCE
Y
1000 MIN. CLEARANCE
W
X
RETURN
AIR
DRAIN
11/2" BSP
MALE
MOUNTING
SUPPLY
AIR
2278
CENTRES
OPA 2000RKTM
Not to Scale
POINT LOADS (kg)
U V W X Y Z
544 474 415 507 543 587
Net Weight 3070 kg
Note : A 2 m clearance
is required above the
exhaust air fans
630
OPTIONAL
WEATHER
HOOD
2435
OVERALL
185
2939 CENTRES
6248 OA
2939 CENTRES
185
955
805
100
560 615
280
1710
225
430
600 MIN.
GROUND
CLEARANCE
OPA 2000RKTM – Wiring Diagram Part 1, of 2
OPA 2000RKTM – Wiring Diagram Part 2, of 2
Options
03/16 Pamphlet No. 3735
© temperzone limited 2016
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