START-UP PROCEDURE
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6.4 Starting the Compressor
a. On the unit's UC8 controller, press and hold the SW3
push button until the display shows a letter 'c' for
Commissioning, then release. This reduces the waiting
times at start-up and between cycles.
b. HWP 142/172/192/255/275 only: Units equipped with
high and low pressure transducers can display the
refrigerant pressures on the UC8 display, making it
unnecesssary to connect gauges). Refer Table 1, p.8.
c. Set the thermostat to cooling and wait until the
compressor starts.
d. For 3 phase systems only:
Check for correct rotation of the compressor. If rotation
is incorrect the compressor will not pump, be noisy and
will draw low current. To correct motor rotation, swap
two phases at the mains power terminals.
e. Use a clip-on current meter to record compressor and
total run amps during stable operation.
f. Check the readings against the specied values on
Specication Sheet and record these values on the
Commissioning Check List on page 11.
g. Use the SW3 push button on the UC8 to cycle through
the pressures and temperatures of the system; refer
display message list on the Commissioning Check List
or UC8 unit label.
h. Record the Cooling cycle pressures and temperatures
on the Commissioning Check List.
i. For reverse cycle systems:
Switch the thermostat to Heating Cycle. The reversing
valve should engage with a click and the compressor
start.
i. Let the system stabilise. Note: During
commissioning the time between cycles is
considerably reduced; if the indoor air coil still holds
moisture this may evaporate and some ‘steam’ may
enter the room. This is not a fault but a result of
commissioning mode.
ii. Use the SW3 push button on the UC8 to cycle
through the pressures and temperatures of the
system.
iii. Record the Heating cycle pressures and
temperatures on the Commissioning Check List.
6.3 General Checks
a. Check that the air ow over the coil is not restricted
and that the fan is running smoothly.
b. Check the condensate drain for free drainage by:
i. rst ensuring all access panels are on,
ii. running the unit at its maximum design fan speed,
and
iii. pouring some water into each tray.
c. Check the supply air ow at each outlet.
d. Check the operation of the thermostat or BMS.
e. Leave all relevant documentation with the unit.
f. Check for leaks at water connections.
g. Check for damage to hoses, if tted.
7. CONTROLS
7.1 TZT-100 and SAT-3 wall thermostat
To connect the thermostat to the unit it is recommended to use shielded twisted pair type cable, suitable for RS485
communications. Signals A and B should form one twisted pair.
Note: The cable shield should connect to terminal ‘0V’ on the UC8 controller only. Do not connnect at both ends.
Refer page 6 for Client Wiring Schematic.
TZT-100 has a set of DIP switches that must be set as follows:
DIP switch 2 ON Equipment type = Heat Pump
DIP switch 3 OFF Equipment stages = One
DIP switch 4 ON Reverse cycle valve = Heating
Fault code 36 will appear on the UC8 if the DIP switch settings are incorrrect.
7.2 Communications format for TZT-100 and SAT-3.
Communications format must be set as per recommmended Modbus RTU:
• Baud rate (bd or br) 19200
• Data bits 8
• Parity Even
• Stop bits (Pa) 1
• TZT-100 address (Ad) 7
• SAT-3 address (Ad) 8
TZT-100: The procedure to check and adjust these settings is:
1. Press and hold the O/RIDE button until the display shows the PIN
2. Use the UP & DOWN buttons to select PIN code 88:21, then press O/RIDE in installer mode.
3. Use the O/RIDE and PROG buttons to cycle through the various installer settings.
If necessary, refer TZT-100 User Manual for more detail.
SAT-3: The procedure to check and adjust these settings is:
1. Press and hold the MODE and 6 button until the display shows the ‘i’ symbol.
2. Use the UP & DOWN buttons to cycle through the various installer settings.
3. Press MODE button to save any new setting.
If necessary, refer SAT-3 Installation Guide for more detail.
CONTROLS
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