UNIT PROTECTIONWIRING
START-UP PROCEDURE
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c. BMS Control, dry contact and analog inputs:
the unit controller (UC8) offers facilities to connect a
BMS system via a set of of no-voltage contacts and
0-10V dc analog signals.
d. BMS control is via Modbus over RS485. For a full
list of the Modbus control setup, settings and read/
write parameters. Contact Temperzone for details, or
visit www.temperzone.biz; model search 'BMS'.
5 UNIT PROTECTION
5.1 General
Unit protection is incorporated in the UC8 Controller
board. A high pressure lockout protects the unit in the
event of either water ow failure in cooling mode, fan
failure in heating mode, or a loss of refrigerant. Units
include an anti rapid cycle timer for compressor on/off
protection.
On HWPSR units the unit's controller (UC8) protects
against freezing of the water within the unit on heating
mode. There are optional relay boards available for both a
generic fault output and a status indicator.
Refer to UC8 Controller label on the unit for operation &
fault diagnostics information, or visit www.temperzone.biz.
Note: Lockout protection can be reset by switching
the unit's power supply off and on. Lockout protection
can also be reset by Modbus connection. For detailed
information about control via Modbus RTU refer to
document UC8 Modbus communications available at
www.temperzone.biz; model search 'UC8'.
5.2 UC8 Controller Options
For more information on the functions, operation and
options provided by the UC8 Controller (eg thermostat
options, remote on/off, BMS control via modbus over
RS485, condensate lift-pump control, DRED, data
logging), refer www.temperzone.biz; model search 'UC8'.
6. START-UP PROCEDURE
6.1 Power
a. Check the units are electrically connected in
accordance with the wiring diagrams.
b. Check all wiring connection and terminal tightness.
c. Switch ON the Main distribution board circuit breaker
and the local isolator.
d. Ensure the thermostat is OFF.
e. Check the supply voltage.
6.2 Fan
a. The fans can be switched ON through the thermostat
or BMS by selecting High, Medium or Low fan speed.
This can be done without starting the compressor.
b. Check the operation of the fan for noise and vibration.
c. Check if the airow is to specication.
6.3 Models with EC Fan Motors (Y Series only)
Various options are available if either High speed or Low
speed need adjusting:
a. If a SAT-3 wall thermostat is tted:-
The maximum and minimum fan speed can be
adjusted through the SAT-3 key-pad. Refer to the
Installation instructions supplied with the SAT-3.
b. To use the UC8 in the unit to adjust the fan speed
(applies only when the SAT-3 thermostat is NOT used
and when a TZT-100 is used):-
i. Ensure the compressor is off and the thermostat or
BMS does not request for the compressor to start.
ii. Press and hold down the SW3 push button on the
UC8 circuit board until the display shows the letter
'H', then release the push button.
iii. The fan will start and run at the 'High' speed setting
(factory default setting is 8.0V). The display will
show the value ('8.0') and the indoor fan will run at
the selected speed.
iv. Each following press on the SW3 push button
increases the indoor fan control voltage in steps of
0.5V, up to a maximum of 10.0V. Pressing the push
button again when value 10.0 is shown returns the
fan control voltage down to the minimum value for
'High' fan speed (3.0V).
v. When the desired setting for high fan speed is
selected then wait for 30 seconds. The controller will
save the selected value in its memory and return to
normal operation.
vi. To adjust the fan 'Low' speed repeat the above
procedure but wait until the display shows the letter
'L' before releasing the push button. The factory
default value for low speed is 5.0V.
c. Check if the High speed airow is to specication.
d. Check if the Low speed is sufciently low in respect to
noise yet without risk of frost on the coil.
e. Universal 24V ac or 12V dc dry contact thermostat
with single or 3 speed fan setting.
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