TemperZone OPA 465RKTB - Startup Procedure; Pre-Start-Up; Operation; Remote On;Off

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START UP PROCEDURE
5. STARTUP PROCEDURE
5.1 Pre-Startup
1.
Leave the external temperature controller on/off switch
in the off position and close the unit’s mains isolating
switch. A four hour delay period is required to allow the
crankcase heaters to drive any liquid refrigerant out of
the compressor oil.
2. Check that the shipping blocks beneath each
compressor have been removed and that each
compressor is secure on its mounts
3. Check that all fan motors are free running.
4. Check that the thermostat is correctly wired to the
unit and is set at the desired temperature.
5. Check that the air lters have been correctly installed
if tted.
6. Check air diffuser dampers are open.
7. Check and tighten all electrical connections.
5.2 Commissioning
Use the supplied Commissioning Sheet to help you
complete the following procedure:
1. After the four hour delay period has crankcase heater
thermostat has been reconnected.
2. Check the supply voltage between each phase
and neutral.
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.
4. 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
specied values in the wiring diagram.
5. Use the on board UC6 Service Interface display
(if supplied) or t R410A compatible gauges and
measure the suction and discharge pressures of both
refrigeration circuits.
6. Check that the outdoor air fan motors are running
smoothly.
7. Test the operation of the reversing valve in cooling
and heating mode (refer Commissioning Sheet).
8. Check the supply air ow at each outlet after
commissioning of fans
9. Check the tightness of all electrical connections and
sign the check label.
10. Touch up any outdoor unit paintwork damage to
prevent corrosion
OPERATION
6. OPERATION
6.1 Remote on/off
The remote on/off function can be enabled or disabled
by using the UC6 Service Interface (option).
When the function is enabled the remote on/off signal
must connect to input DI7, signal return is DIC1. The
remote on/off signal must be an external voltage free
switched relay contact.
The unit is active when DI7 is connected to DIC1.
6.2 High pressure protection (HP)
If high pressure transducers are connected to inputs
HP1 and HP2 then a compressor is switched off when
the discharge line pressure reading exceeds 42.0bar.
Instead of high pressure transducers some systems
may be tted with high pressure switches. These
also connect to inputs HP1 and HP2. When a high
pressure switch activates (electrical circuit opens) the
compressor is stopped.
Similarly, if the condensing temperature reported by an
outdoor coil temperature sensor (connected to TS1 and
TS2) reports a coil temperature above +66°C (cooling
mode) the compressor is switched off.
The UC6 will automatically reduce capacity of a digital
scroll compressor before the maximum value of 42bar /
66°C is reached.
When a compressor is stopped due to high pressure
it is held off for a period of 3 minutes, after which it is
allowed to restart (provided pressure has fallen well
below the maximum).
If three consecutive trips occur then the unit will be
“locked out”. The trip counter is reset to 0 when there
has been no compressor run request for longer than 60
minutes.
Display indication when protection is active -
number 4 (ashing)
6.3 Loss of refrigerant protection (LOR)
When a compressor is running the UC6 continuously
monitors the various temperatures. The controller
software applies logic that enables it to determine
whether the system has an adequate amount of
refrigerant. Signals used for this check are mid-coil
temperatures (TS1, TS2), suction temperatures (ST1,
ST2 and discharge line pressures (HP1 and HP2, if
present).
The check is not made during the rst 5 minutes
after a compressor is started to allow pressures and
temperatures to settle.
If the compressor is a variable speed type or a digital
scroll type then the check is made only when the
capacity is at 100%.
When a compressor is stopped due to loss of
refrigerant it is held off for a period of 3 minutes, after
which it is allowed to restart.
If three consecutive trips occur then the unit will be
“locked out”. The trip counter is reset to 0 when there
has been no compressor run request for longer than 60
minutes.
Display indication when protection is active -
number 3 (ashing)
6.4 Indoor coil frost protection (FROST)
When the unit is cooling the evaporating temperature
in the indoor coil must remain above -10°C (adjustable
from -10°C to -2°C by using a UC6 service tool). If
this temperature falls below the threshold then some
amount of ice (frost) is likely to have formed on the
indoor coil.