TemperZone OSA 160RKTGH, Установка и обслуживание

Страница: 2 / 4

UNIT CONTROLLER (UC7)
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.
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 UC7 Controller label on the unit or
www.temperzone.biz for operation & fault
diagnostics information.
MAINTENANCE
Weekly For First Four Weeks
1. Check indoor unit air filters (if fitted) and
vacuum or wash clean as necessary.
2. Check condensate drain for free
drainage.
3. Check compressor compartment for oil
stains indicating refrigerant leaks.
4. Check tightness of electrical
connections.
Six Monthly
1. Check the tightness of all fan and motor
mountings.
2. Check tightness of electrical
connections.
3. Check that fan motors are free running.
4. Check suction and discharge operating
pressures.
5. Replace indoor unit air filters (if fitted).
6. Check condensate drain for free
drainage.
Yearly
1. Check all refrigerant piping for chafing
and vibration.
2. Check the operation of electric heaters if
fitted.
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 fins.
7. Touch up any outdoor unit paintwork
damage to prevent corrosion.
NOTE
The manufacturer reserves the right to
change specifications at any time without
notice or obligation. Certified dimensions
available on request.
Signal Input for Controller 0-10V is required
(temperzone Part No. 201-000-386).
If a TZT-100 Controller is used then variable
capacity control is automatically included
and no additional wiring is required.
Note : The TZT-100 Controller can
automatically switch the indoor fan off during
de-ice, if selected, therefore no additional
wiring is required to achieve this result.
A 24 hour power supply to the crankcase
heaters is required, otherwise the warranty
is void.
SYSTEM CHECK TESTS
1. Leave the remote switch 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.
2. Check that all fan motors are free
running.
3. Check for correct rotation of the
compressor. If rotation is incorrect
the compressor will not pump and will
draw minimal current. To correct motor
rotation, change the phasing at the main
power terminal.
4. Check that the thermostat is correctly
wired to the unit and is set at the desired
temperature.
5. Check that the indoor coil sensor lead is
correctly wired to the unit.
6. Check that the air filters, if any, have
been correctly installed.
7. Check any supply air diffuser dampers
are open.
START UP PROCEDURE
Use the supplied Commissioning Sheet to
help you complete the following procedure:
1. Switch on the unit after the four hour
delay period for the crankcase heater
has expired.
2. Check the supply voltage.
3. Measure the current draw on the
compressor motor and on each fan
motor. Check all readings against the
specified values - particularly the indoor
fan amps if the unit is installed in a free
blow application.
4. Fit gauges and measure the suction and
discharge pressures.
Important : Gauges must be designed
specifically for use with R410A.
5. Test the operation of the high pressure
safety control by switching off the
outdoor unit's fan.
6. Test the operation of the reversing valve
by running the unit in both the heating
and cooling mode.
7. Check that the air flow over the outdoor
unit's coil is adequate and that the fan is
running smoothly.
8. Check the superheat - refer charging
procedure.
9. Check the supply air flow at each outlet.
10. Touch up any outdoor unit paintwork
damage to prevent corrosion.
Procedure:
1. Evacuate Indoor Unit and
interconnecting pipework to a pressure
of 500 microns and hold for 15 mins.
2. Add refrigerant, if needed, via the
Schraeder connection on the smaller of
the Outdoor Unit's two service valves.
3. Open the service valve at the Outdoor
Unit to allow refrigerant to flow
throughout the system.
4. Leak check all brazed and fitted joints.
IMPORTANT :
Step 8 of the 'Start Up Procedure' requires
you to check that the superheat on the
suction line (where it enters the Outdoor
Unit) is between 3°C – 5°C on cooling cycle
with an indoor air temperature in the range
21° – 27°C and outdoor air temperature in
the range 24° – 35°C. If the conditions of the
day do not allow this, use the heating cycle
or other heat source to raise the indoor
air temperature to about 24°C. Return to
cooling cycle and blank off the outdoor
coil to raise the head pressure to 400 psig
(2760 kPag). Alter charge up or down to
establish correct superheat.
WARNING:
This unit is designed for use ONLY with
the refrigerant HFC -410A. 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.
Oil Charge
For line lengths in excess of 40 m, Emkarate
RL22CF polyolester oil (or similar) should
be added to the refrigerant at the rate of
10 ml/m of suction piping. Note : Do not use
mineral oil.
ELECTRICAL REqUIREMENTS
Electrical work must be done by a qualified
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 Outdoor Unit.
Note : DO NOT USE REWIRABLE FUSES.
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.
The matched ISD indoor unit is supplied
with a 25m coil sensor lead that must be
connected as per the wiring diagram.
The system is set up for the compressor to
be controlled variably by:
1. TZT-100 Controller (via modbus),
2. 0-10V dc command via BMS modbus, or
3. 0-10V dc command via a client supplied
external controller.
If option 3 is chosen, then the optional
Pipe Length Capacity Loss
On Cooling Cycle Due to Pressure Drop
Note :
Loss percentages are approximations only, due to piping variations. No allowance made for vertical piping.
Pipe Size (mm)
Equivalent Line Pipe Length (m)
Liquid
13
Suction
22
5
0.7 %
22 mm
0.5 m
20
4.7 %
10
2.1 %
15
3.4 %
30
6.1 %
Suction Pipe Size OD
Long 90° Radius (2 x pipe dia.)
Additional Pipe Length to allow per Bend