Trane THS-02 User manual

THS-02
Thermostat for heat pump- 2 com-
pressors with auxiliary heating
User’s guide
A70 UG 007 GB

2A70 UG 007 E - 0299
© American Standard Inc. 1999

A70 UG 007 E - 0299
Index
3
Operating instructions 4
General information 4
User commands 4
Power cuts 5
Temperature precision 5
Installation instructions 6
Position 6
Removing the thermostat from its base 6
Setting the micro-switches 7
Replacing thermostat on its base 7
Specifications 9

Operating instructions
4A70 UG 007 E - 0299
Your new THS thermostat has been
designed to provide precise control and
display of the ambient temperature. It
also displays all the other information
you need concerning your system.
The symbols on the keys and the infor-
mation display format make it a prod-
uct that is easy to understand and use.
It is a good idea to set aside some time
to read these instructions and famil-
iarise yourself with the different func-
tions to get the maximum benefit from
this electronic control system.
General information
The thermostat normally displays the
ambient temperature, the operating
mode and indicates whether the unit is
cooling or heating. The six keys on the
front panel give you total control of the
equipment.
You can select different heating and
cooling set points for the system, e.g.
21°C for heating and 24°C for cooling.
To increase or decrease the heating and
cooling set points, you only have to
press one key. In addition you can
choose display in °F or °C.
You can also select continuous fan
operation (useful for an air purifier) or
fan operation linked to operation of the
air-conditioning system.
User commands
MODE: ❉
Select the operating mode you want by
pressing the MODE key several times.
❉- controls the system in cooling
mode only.
(the word "COOL" is displayed
for 5 seconds).
- controls the system in heating
mode only (the word "HEAT" is
displayed for 5 seconds).
❉- controls the system in both
heating and cooling modes
(the word "AUTO" is displayed
for 5 seconds.
() - forced heating (the word “EHt“
is displayed for 5 seconds).
OFF - stops the thermostat and the
system
COOLING: ❉
Select the temperature the system
must maintain in cooling mode by
pressing the and keys. The set
point value is displayed for 5 seconds
with .
HEATING:
Select the temperature the system
must maintain in heating mode by
pressing the and keys. The set
point value is displayed for 5 seconds
with .
FAN:
The fan starts automatically when the
system is operating, but this is not indi-
cated on the display unit. To select con-
tinuous operation of the fan press the
key and the screen displays
.
OFF:
When the word “OFF“ is displayed, the
system does not operate.
Avoid using the OFF mode during peri-
ods of extreme cold, to prevent the risk
of frosting.
AUTO: ❉
In this mode the system operates in
heating and cooling mode. The thermo-
stat changes automatically from one to
the other according to the chosen set
points.
N.B.: The thermostat always leaves
a difference of 1°C between the
heating and cooling set points.
▲
▼
▲
▼

5
A70 UG 007 E - 0299
KEY /(Outdoor temp. option):
When the outdoor temperature
option is connected to your thermo-
stat, you can display this value by
pressing the /key. If this
option is not connected, the thermo-
stat displays “- -“
KEY / (Day/Night):
When the thermostat is initialised,
the symbol corresponding to the
day-time temperature is displayed.
By pressing the / key or pow-
ering up the CLK1 and CLK2 termi-
nals at the back of the thermostat
(customer connection), you can
select a relief or night-time tempera-
ture . (The thermostat memorises
this temperature).
To alternate between the two tem-
perature settings simply press the
/ key.
CLOCK TERMINALS (option):
CLK1 - CLK2
If you connect a clock to these termi-
nals, the thermostat can alternate
automatically between the day/night
set point values.
REMOTE SENSOR TERMINALS
(option):
RS1-RS2-RS+V
The THS thermostat is designed to
accept an electronic remote sensor
that will enable you to place the ther-
mostat in an unobtrusive position.
°C/°F
Press the and keys simulta-
neously to change the °C /°F display.
Power cuts
One of this thermostat’s special fea-
tures is that it does not need a bat-
tery to conserve the selected set
points if a power cut occurs. Its
memory is not affected by power
cuts, no matter how long they last.
When the current returns, the ther-
mostat will continue to operate as if
the power had never been discon-
nected.
Temperature precision
The thermostat will measure the
temperature exactly once it has been
installed and powered up for at least
one hour.

6A70 UG 007 E - 0299
Installation instructions
Position
To operate correctly, the thermostat
must be positioned on an indoor par-
tition wall in a part of the building that
is regularly occupied. In addition, it
must be placed at least 50 cm from
any external wall, at a height of
roughly 1.5 m, in a place where the
temperature represents an average
for the building and where the air cir-
culation is unobstructed.
Avoid the following locations:
- Behind doors or in corners where air
does not circulate freely.
- Places where direct lighting or radia-
tor heating installations may affect
the control system.
- On an external wall.
- Next to or facing air-conditioning
discharge grilles, stair wells or exter-
nal doors.
- Places where the presence of water
or steam piping, hot air ducts or an
unoccupied room behind the ther-
mostat may affect its operation
- Near to a unit’s air discharge grille.
- Near to sources of electrical interfer-
ence, such as contact relays.
Removing the thermostat
from its base
1) Place a flat screwdriver blade in
the the slot in the middle of the
unit’s bottom edge. Pull up the
blade gently until the lid comes off
the base.
2) Pull the bottom part of the thermo-
stat towards you and rotate it.
3) Lift up the thermostat to remove it
from the base
4) Connect the system’s wires to the
thermostat, referring to the dia-
gram below. The wiring can then
be inserted in the wall cavity or a
junction box. The access hole
must be made water-tight to pre-
vent air currents inside the wall
affecting the thermostat’s mea-
surements.
5) You need terminal (C) of the 24V
transformer common.
➞
123

7
A70 UG 007 E - 0299
Setting the micro-switches
* Heat pump:
Additional: the compressor system
ceases to operate when the auxiliary
heating is operating.
Normal: the compressor system
and the auxiliary heating can oper-
ate simultneously.
** Auxiliary heating :
Comfort: the auxiliary heating can
be activated as soon as the room
temperature is 2°C below the set
point.
Economic: auxiliary heating ceas-
es to operate if the room tempera-
ture is within 0.5°C of the set point.
Forced heating is never autho-
rised.
Replacing thermostat on its
base
1) Position the thermostat on the
hinge lugs located on top of the
base.
2) Slowly lower the thermostat while
rotating it and press down on the
bottom edge until it clicks into
place.
12345678
ON
Normal heat pump
Not used
4 min. minimum aux. heat. operat.
Keyboard in operation
Economic auxiliary heating
1 stage
LED 1 free without icon
LED 2 free without icon
Additional heat pump
Not used
2 min. minimum aux. heat. operat.
Keyboard blocked
Auxil. comfort heating**
Multi-stage
LED 1 + filter icon
LED 2 + fault icon
➞
2
1

8A70 UG 007 E - 0299
THS 02
W2
G
Y1
W1
Y2
,,
,,
,,
,,
,,
,,
,,
,,
B
O
b
c
d
f
h
W1
Y1
R
24 V
G
O
B
Y2
LED1
LED2
RS+V
RS1
RS2
CLK2
CLK1
a
a Compressor 2
b Auxiliary heating
c Compressor 1
d Fan
e Common
f Independent power supply
g Mains power supply
h 24 V transformer
Note 1
Note 2 e
24V(C) g
❴

9
A70 UG 007 E - 0299
Output terminal functions
W1 Make-up or forced auxiliary
heating
Y1 Compressor 1 in cooling or
heating
Y2 Compressor 2 in cooling or
heating
G Fan starting
O Reversing valve supplied
with cooling
B Reversing valve supplied
with heating
R Independent power supply
24 V System 24 V power supply
24 V (C) 24 V common
LED 1 Free LED for status
LED 2 or to indicate function
CLK1 Used with remote clock
CLK2 for alternating set points
RS2 Used to connect the out-
door temp.sensor option
RS1 and/or remote ambient
temp. sensor option
RS+V Refer to instructions sup-
plied with the sensors.
Note 1: The R terminal can be used for
a second independent power supply.
If there is just one power supply,
bridging is provided between 24V
and R.
Note 2: This thermostat can operate
using 24VD C. The negative pole must
be connected to the 24V terminal (C).
Specifications
Nominal voltage 20-30 VAC, or
24 VDC nomi-
nal
Current amps (AC) 0.05 to 0.5 A
direct per out-
put with max.
peaks at 1A
Current amps (DC) 0 to 0.5 A
direct per out-
put with max.
peaks at 1A
Control range Heating: 5 to
30°C in 1°C
stages
Cooling:16 to
40°C in 1°C
steps
Ambient temperature
measurement range 0 to 48°C
Outdoor temperature
measurement range -48°C to 48°C
Precision ±0.5°C at 20°C
Minimum dead band 1°C between
heating and
cooling
modes.
Note : This thermostat contains elec-
tronic circuits which replace tradi-
tional mechanical contacts.

10 A70 UG 007 E - 0299
Notes

11
A70 UG 007 E - 0299
Notes

Société Trane
BP 6 - 1, rue des Amériques
88191 Golbey Cedex
France
http : // www.trane.com
An American Standard Company
Société Trane - Société Anonyme au capital de 41 500 000 F - Siret 306 050 188-00011 -
RCS Epinal B 306 050 188
- Numéro d'identification taxe intracommunautaire :
FR 83 306050188
A70 UG 007 GB - 0299
Supersedes A70 UG 007 E- 0796
Literature stocking location : Europe
Trane reserves the right to alter any information without prior notice.
For additional information, contact :
Distributor / Installer stamp
The constructor's policy is one of continuous product
improvement, and he reserves the right to alter any
details of the products at any time without notice
This publication is a general guide to install, use and
properly maintain our products. The information given
may be different from the specification for a particular
country or for a specific order. In this event, please refer
to your nearest office.