TemperZone UNIT CONTROLLER 7 User manual

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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UNIT CONTROLLER 7 (UC7)
Operation & Installation
Air-to-Air Units
Date: 20 March 2015
Issue: 9

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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Contents
1. Connections, air-to-air unit .......................................................................................3
2. Functions assigned to SSR1, SSR2 and AUX ..........................................................3
3. Input and output signals ............................................................................................4
3.1. Temperature sensor inputs...................................................................................................... 4
3.2. Pressure transducers:............................................................................................................... 4
3.3. Switch input IN #1.................................................................................................................. 4
3.4. Switch input IN #2.................................................................................................................. 4
3.5. Remote On/Off ....................................................................................................................... 4
3.6. Switched signal type thermostats............................................................................................ 5
3.7. Digitally communicating thermostat ...................................................................................... 6
3.8. Electronic expansion valves.................................................................................................... 7
3.9. DRED inputs........................................................................................................................... 7
3.10. Mains power........................................................................................................................ 7
3.11. Optional 0-10V analogue input........................................................................................... 8
4. DIP switch selections................................................................................................9
5. Test mode................................................................................................................11
6. Commissioning mode..............................................................................................11
7. Set-up mode.............................................................................................................12
8. Quiet Mode..............................................................................................................12
8.1. Enabling quiet mode on units with TZT-100 thermostat...................................................... 12
8.2. Enabling quiet mode on units without TZT-100 thermostat................................................. 12
9. Dry mode (de-humidification) ................................................................................13
9.1. Enabling the TZT-100 thermostat for dry mode................................................................... 14
9.2. Enabling dry mode on units without TZT-100 thermostat................................................... 14
9.3. Conventional dry mode......................................................................................................... 14
9.4. Advanced dry mode.............................................................................................................. 15
9.5. Super dry mode..................................................................................................................... 15
10. De-icing the outdoor coil.........................................................................................15
11. Units with more than one UC7................................................................................16
12. Control by BMS and data logging ..........................................................................16
13. Display messages (normal operation).....................................................................16
14. Faults .......................................................................................................................17
15. Specifications ..........................................................................................................19

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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Note:
The information in this document applies to UC7 controllers programmed with
software version 4.91 or later.
To find the UC7 software version:
Turn on mains power to the UC7 controller and observe the display.
First the display will show the characters “UC7”, followed by the software version.
1. Connections, air-to-air unit
The drawing below shows all possible connections for air-to-air units. Most units do not require the use
of all input /output signals.
2. Functions assigned to SSR1, SSR2 and AUX
System
Digital
Tandem
SSR1
SSR2
AUX
Notes
Air to air
CCH
-
ECO/-
* See notes
●
CCH
CAP
ECO/-
* See notes
●
CMC2
CCH
ECO/-
* See notes
●
●
CMC2
CAP
ECO/CCH
* See notes
Legend: CCH = Crank case heater
CAP = Capacity solenoid (digital scroll compressor)
CMC2 = Compressor 2 contactor (tandem system)
ECO = Economiser
* Notes:
The economiser output is enabled only with DIP switch 13 OFF and DIP switch 15 ON.
If the economiser function is enabled on a tandem air-to-air unit with a digital compressor the AUX
output functions as economiser output. In such units the UC7 does not provide an output for a crank
case heater. If switch 15 is OFF the AUX output can be used to control a crank case heater.
In all other cases the AUX output on an air-to-air unit has no function and will be off.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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3. Input and output signals
3.1. Temperature sensor inputs
Note:
If pressure transducers are connected to the HPT and LPT inputs then there is no need for
temperature sensors on the outdoor coil and indoor coil (OC and IC).
Connector
Function
Notes
DL
Compressor discharge line
Red
SL
Compressor suction line
Blue
AMB
Ambient
Yellow or black (not always required)
DEI
De-Ice (on fins of outdoor coil)
Blue (not required on cooling only units)
OC
Outdoor coil
Yellow (not always required)
IC
Indoor coil
Yellow (not always required)
3.2. Pressure transducers:
Connector
Function
Default pressure range
Output voltage
HPT
High pressure
0 to 4500kPa
0.5 to 4.5V
LPT
Low pressure
0 to 1730kPa (fixed capacity compressors)
0 to 3450kPa (digital scroll compressors)
0.5 to 4.5V
Not all temperzone air conditioning units are equipped with pressure transducers. If no pressure
transducer is present then the corresponding switch input (IN#1 and/or IN#2) is configured as an
input for a pressure switch. Refer to sections 3.3 and 3.4.
3.3. Switch input IN #1
If the unit has a high pressure transducer connected to HPT then no high pressure switch is needed
and the IN #1 terminals can be left un-connected.
If a high pressure switch is fitted then connect it directly to the two IN #1 terminals.
3.4. Switch input IN #2
Low pressure
transducer
LP switch
Overload
switch
What to do with the IN #2 terminals
Yes
No
No
Short IN #2 terminals together.
Yes
No
Yes
Connect overload switches in series,
then to the IN #2 terminals.
No
Yes
No
Connect low pressure switch directly to the two IN #2
terminals.
3.5. Remote On/Off
A remote On/Off signal (‘dry’ or ‘voltage-free’ contacts) can be connected to the “On” and “G”
terminals.
To turn the unit on the remote on/off input must be closed-circuit.
If no remote On/Off function is needed then the terminals must be connected (looped).
When the unit is off by the remote on/off signal the display will show a slowly flashing –symbol.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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3.6. Switched signal type thermostats
Signals from a thermostat that provides switched signals normally connect to the following input
signals:
COMP
HEAT (not required for cooling-only installations)
HIGH –MEDIUM –LOW (required only when the UC7 controls the indoor fan)
If a communicating thermostat is used (TZT-100), or the unit is controlled by a BMS via Modbus over
RS485, or the UC7 is configured as a slave unit, then terminals HEAT, HI, ME, LO, C1, C2 can be left un-
connected.
If the UC7 is configured as a slave unit AND the master unit is controlled by BMS via Modbus over
RS485, or a TZT-100 thermostat is used, then the slave COMP input acts as an input for overload
switches. If no overload switches are to be connected then the COMP input should be made
permanently active with 24V AC or 230V AC.
If the master uses the switched signal type COMP input then each slave unit must also have an
appropriate COMP input signal connected.
Important note for version 3 boards (part number 201 000 403):
UC7 version 3 boards will accept 24V AC or 12V DC control signals on inputs HI, ME, LO, COMP and
HEAT. These boards cannot accept 230V AC control signals!
Important note for version 2 boards (part number 201 000 390):
A new UC7 version 2 board accepts 24V (AC or DC) signals from the thermostat.
It is allowed to connect 230V AC signals to inputs HI, ME, LO, COMP and HEAT. When 230V AC is
applied for the first time to any one of these inputs a small puff of smoke may come from resistors
R61, R56, R50, R68 or R72. This is normal and will occur only once!
(These five resistors are special fusible types, designed for this purpose.)
Once 230V AC has been applied to any of these inputs, they will no longer respond to 24V AC
signals!
Signal level:
Terminals “C1” and “C2” must connect to:
24V AC or DC
24V common
230V AC
Mains neutral
The UC7 provides 12V DC power on terminal “12” that can be used to power a thermostat.
Terminal “G” is the ground return for the 12V DC power.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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3.7. Digitally communicating thermostat
Use shielded twisted pair suitable for RS485 to connect a digitally communicating thermostat. The
UC7 supports the Temperzone TZT-100 thermostat. Other thermostats can be added on request.
Connect the twisted pair wires to terminals “B2” (-) and “A2” (+).
If the distance between
the thermostat and the
UC7 is greater than 10m
and the UC7 is located at
one end of the cable then
place jumper “J2” on the
centre and left pins
Otherwise place jumper
“J2” on the centre and
right pins.
The UC7 provides 12V DC power on terminal “12” that may be used to power the thermostat.
Terminal “G” is ground return for the 12V DC power. For this application it is recommended to use a
shielded cable with twisted pairs. The correct connections are shown here:
The TZT-100 thermostat can also be powered by an isolated 24V AC power source as shown below:
In this case the 24V AC supply common should NOT be earthed elsewhere in the system, otherwise
differences in earth potentials can lead to unreliable communications between the thermostat and
the UC7.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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3.8. Electronic expansion valves
The UC7 can control up to two electronic expansion valves (EXV) via connectors EXV1 and EXV2. The
expansion valves must be 12V unipolar types. The connectors must be compatible with JST type XH
and have either 5 pins or 6 pins. If the valve connectors have 5 pins then use a small sharp knife to
(very carefully!) make a cut in the white plastic of the headers about 2mm beside the leftmost slot,
then insert the connector so that pin 1 (leftmost) remains unconnected.
DIP switches 7 and 8 on UC7 board define how the outputs EXV1 and EXV2 are operated. Refer to
section 4 (DIP switch selections) for more details.
3.9. DRED inputs
Inputs D1, D2 and D3 can be connected to a set of three ‘voltage free’ dry switch contacts in
accordance with the DRED standard. The SC terminal is the common for the three inputs.
Note: Terminal SC is internally directly connected to ‘G’ and ‘EARTH’.
Optionally, the DRED level can be communicated to the UC7 by a BMS via RS485 serial
communications. If this option is used then it is not necessary to connect anything to the DRED
inputs; the inputs can be left open circuit.
If the DRED function is not required then leave these contacts open circuit.
Input D1 alternate function: Quiet Mode enable/disable. Refer to Quiet Mode and the DIP switch
settings for more information.
Input D2 alternate function: Dry Mode enable/disable. Refer to Dry Mode and the DIP switch
settings for more information.
3.10. Mains power
Connect 230V AC mains live to terminal L, neutral to terminal N.
NOTE:
The EARTH terminal on the UC7 controller board MUST always be directly
connected to the unit earth stud.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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3.11. Optional 0-10V analogue input
Units equipped with a digital scroll compressor are capable of variable duty. The required duty can be
set in three ways:
Automatic, only in combination with the TZT-100 thermostat
Via Modbus, for example by a BMS
Via an optional 0-10V analogue input
The 0-10V input comes as a small plug-in-board and connects directly to the UC7 controller via the 10-
pin header pins on the circuit board. The controller automatically detects the presence of the 0-10V
input board when power is applied.
Note: The 0-10V input is not electrically isolated; the terminal “G” is directly connected to the
controller EARTH terminal. If the 0-10V signal source is located remotely from the unit then it is
recommended to use a suitable 0-10V isolating amplifier.
IMPORTANT: The 0-10V plug-in board must be connected to the controller in the correct orientation!

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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4. DIP switch selections
Table 1, DIP switch functions for switches 1 to 13.
Switch
Function
1
OFF
ON
Indoor air flow (also refer to chapter 9: Dry mode)
Variable indoor air flow:
Indoor fan performs a warm start when unit starts heating.
Indoor fan stops during de-ice cycles.
Indoor fan speed may vary from thermostat request.
Fixed indoor air flow:
Indoor fan follows thermostat request even when heating starts.
Indoor fan continues during de-ice cycles.
Indoor fan speed follows thermostat request.
2
OFF
ON
Compressor type
Fixed capacity.
Digital scroll.
3
OFF
ON
OFF
ON
4
OFF
OFF
ON
ON
Outdoor fan selection
Three speed fan (HI/ME/LO relay outputs).
One speed fan (HI relay output).
0-10V EC fan (V1 output).
Modbus over RS485 EC fan (A2 and B2 outputs).
5
OFF
ON
OFF
ON
6
OFF
OFF
ON
ON
Indoor fan selection
Three speed fan (HI/ME/LO relay outputs).
One speed fan (ME relay output).
0-10V EC fan (V2 output).
Select this option when the UC7 does not control the indoor fan.
Modbus over RS485 EC fan (A2 and B2 outputs).
7
OFF
ON
OFF
ON
8
OFF
OFF
ON
ON
Electronic expansion valve operating mode
No electronic expansion valves (e.g. accurators, capillary tube).
One valve or two parallel electronic expansion valves (as required), positions always
identical. If the unit is capable of advanced dry mode operation then this setting is
the ‘High Efficiency Mode’.
Two electronic expansion valves: Cooling: EXV1 regulates, EXV2 fully open
Heating: EXV1 fully open, EXV2 regulates
(This option should also be selected if the UC7 controls an outdoor or an indoor unit
only. Use EXV1 output for an indoor unit, EXV2 output for an outdoor unit.)
Advanced Dry Mode. This option must only be selected on units suitably equipped.
Dry mode has no influence on the unit when heating.

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9
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9
OFF
ON
OFF
ON
10
OFF
OFF
ON
ON
Electronic expansion valve type
How to recognise the valve type
Dunan DPF series
Zhe Jiang Sanhua DPF series
Carel E2V series (& E3V series with unipolar coil)
Custom series
removable black coil
non-removable metal coil
removable red coil
-
11
OFF
ON
OFF
ON
12
OFF
OFF
ON
ON
System number (for units with multiple compressors)
1 (master system, select this for single compressor units)
2 (slave system)
3 (slave system)
4 (slave system)
13
OFF
ON
Function of DIP switches 14, 15 and 16
Standard DIP switch functions; refer to table 2.
Custom DIP switch functions; refer to table 3.
Table 2, Standard DIP switch functions for switches 14, 15 and 16.
Switch
Function
13
OFF
OFF
OFF
OFF
OFF
OFF
14
OFF
ON
Tandem compressor option
Single stage system.
Tandem compressor system.
15
OFF
ON
Economizer option
Disabled
Enabled (AUX output)
16
OFF
ON
Quiet mode option
Disabled
Enabled (D1 input)
Table 3, Custom DIP switch functions for switches 14, 15 and 16.
Switch
Function
13
ON
14
OFF
15
ON
16
ON
Custom options
Enable all of the following options:
Quiet mode (D1 input)
Dry mode (D2 input)
Economiser (AUX output)
All other custom configuration options for air-to-air units are
reserved and must not be selected.