AUTOTERM PU-5 User manual

Ver.1.0.0.1
www.autoterm-europe.com
PU-5 control panel
for PLANAR air heaters
Operating manual
EN

2
Introduction .
This Operating Manual is a part of the documentation for PLANAR air heaters. It
contains an overview for the user on safe maintenance and operation of the product.
If you have any concerns, we strongly recommend that you contact the authorized
service centers, the addresses and phone numbers of which you can obtain from the seller
or on the website www.autoterm-europe.com
Before operating the product, read this operating manual and the
heater operating manual.
Warranty and liability .
The manufacturer will not be liable for defects and damage caused by failure to follow
the heater installation and maintenance instructions.
 The control panel is only allowed to be used for heater control.
 Do not connect and disconnect the control panel connector while the heater is
operating.
 After the heater is switched off, it should not be switched on again after at least 5–10
seconds.
 For safe heater operation, after two consecutive failed starts, contact the service
department for troubleshooting information.
See the warranty certificate for product warranty period and warranty service terms.
Safety .
Switching on and operation of the heater in locations where combustible
vapors or gases or large amounts of dust can form and accumulate (for
example, gas stations petroleum, fuel, coal, timber or grain storage
facilities) is PROHIBITED. Explosion hazard.
Do not switch on and operate the heater in closed not ventilated rooms (boxes,
garages, etc.). Hazard of poisoning and asphyxiation by exhaust gases.
Do not switch on and operate the heater if there are combustible particles or
liquids in the exhaust gas. Fire hazard.
Do not use a faulty heater. Injury hazard due to use of faulty device.

3
PU-5 control panel .
The following are located on the front of the panel:
1 – Ventilation mode on/off button;
2 – Heater on/off button;
3 – Operation LED display;
4 – Ventilation mode LED display;
5 – Potentiometer knob.
The LED in Pos. 3 indicates the heater status:
- yellow light - heating mode;
- fast blinking yellow – during purging;
- slowly blinking red - in case of malfunction;
- off - heater is not operational.
The LED in Pos. 4 indicates the ventilation mode status:
- green light - interior sensor is not connected and heater operates in ventilation
mode;
- green blink - ventilation mode off;
- yellow light - the interior sensor is connected and the heater operates in heating
mode with ventilation function;
- off - heater is not operational, with ventilation mode off.
Using the control panel .
 When the heater is connected to the vehicle electrical circuit, the display pos. 4 fast
blinks green to display the connection process.
 The button pos. 1 is designed to:
- switch the ventilation mode on and off;
- switch the ventilation function on and off in heating mode (if the interior sensor is
connected).
 The button pos. 2 is designed to switch on the heater in heating mode (for an unlimited
time) and switch the heater off.
 The regulator pos.5 is intended for:
- regulations of speed of rotation of the fan on the ventilation mode;
- regulations of heating capacity of a heater from "min" to "max" of kW on the heating
mode;
- regulations of desirable air temperature from 1 °C (or 15 °C *) to 30 °C on the
heating mode.
* - Depending on the heater model and production year.

4
Installation of the control panel .
- Apply a marking (see. Fig.1) on a surface for installation of the control panel (a hole
for a harness and a hole for the self-tapping screw).
- Pull and dismantle the potentiometer knob. Before dismantling the potentiometer's
knob remember orientation of the knob relative to the mark on the control panel.
- Install the control panel on a surface and secure it with a self-tapping screw.
- To install the potentiometer handle in former situation (which you remembered
before), insert an edge of a plastic detail in the knob with a cuts into a potentiometer's shaft.
Fig.1
Operating modes .
“power”
(if the interior sensor
is not connected)
 designed for quickest possible heating of the space;
 the heater operates continuously at a set power.
“temperature”
(if the interior sensor
is connected)

designed to heat the space to the required temperature;
 heat output decreases as the difference between the desired
temperature and the temperature in the space decreases.
“ventilation”*  designed for air circulation in the space
“Ventilation during
heating” function
(if the interior sensor
is connected)

designed to maintain the required temperature in the space;
 after the required temperature is reached, the space heating
is stopped and space air circulation is performed;
 controls the space temperature; if the temperature drops
below the set point, the heater will start in heating mode.

5
Features of operating modes .
 In case of “power” control mode is selected, the heater operates continuously with
selected heat output. When a comfortable temperature is reached, we recommend to
reduce power, ventilate the space or to switch off the heater.
 If the interior sensor is connected, the heater operates automatically in
“temperature” mode. The heater will operate to maintain the desired temperature
from 1ºC (or 15ºC *) to 30ºC; here, the heater heat output will vary from max to min
depending on the air temperature. The higher the air temperature, the less heat
produced by the heater.
*- Depending on the version and year of production of a heater. The version of the
program with adjustment of temperature from 1ºC to 30ºC. C introduced since March,
2014.
Position (approximate) potentiometer knob with cabin sensor connected.
If the interior sensor is connected, after set temperature achieved:
- without the “ventilation” function activated, the heater will switch to “minimum” mode.
The further operation of the heater depends on the temperature of the space:
а) if the temperature keeps increasing, the heater will continue to operate with
“minimum” output. The heater can be switched off manually.
б) if the temperature begins to decrease, the heater will gradually increase the heat
produced to maintain the required temperature in the space. The heater can be
switched off manually.
- with the “ventilation” function activated, when the required temperature is reached the
combustion will stop and air circulation in the space will start. When the temperature in the
space drops 5 ºС below set point, the heater will fire up again. The heater can be switched
off manually.
Do not switch off the heater electric power before the purging cycle
is completed.
If the interior temperature sensor circuit breaks (during operation), the
heater will switch to medium-power mode.

6
Control operation diagramm

7
Malfunctions .
Malfunctions occurring during heater operation are coded and automatically displayed
on the control panel by blinking of the red LED in pos. 4 (with pause). For malfunction
reset, press any key.
ATTENTION!
Maintenance and repair should only be performed by trained, qualified
personnel!
The user can correct the following malfunctions (Table 1).
For all other malfunctions (Table 2) or if the user cannot correct the malfunction, contact a
service center.
Table 1
Number
of blinks
Malfunction
description
Comments
Troubleshooting
1 Heat exchanger
overheating
Check the heater inlet and outlet pipes for free inflow and
outflow of heated air.
2 All attempts to
start failed
Check the fuel supply (check the fuel line). Check the
combustion air supply system and the gas exhaust pipe.
3
Too many
flameouts during
operation
Check the fuel supply (check the fuel line).
Check the combustion air supply system and the gas
exhaust pipe.
8
No
communication
between control
panel and control
unit
Check connecting wires and connectors.
Control panel doesn’t receive data from the control unit.
Check connecting wires and connectors.
Control unit doesn’t receive data from the control panel.

8
Number
of blinks
Malfunction
description
Comments
Troubleshooting
9
Shutdown due to
overvoltage
Check the battery, the voltage regulator and power supply
wiring. Voltage between contacts 1 and 2 of power
connector should not be higher than 30 V (not higher than
16 V for 12 V product).
Shutdown due to
undervoltage
Check the battery, the voltage regulator and power supply
wiring. Voltage between contacts 1 and 2 of power
connector should not be lower than 20 V (not lower than
10 V for 12 V product).
10 Ventilation time
exceeded
Check the air intake and the exhaust pipe. If clogged,
remove foreign particles.
12
Overheating in
the control unit
area. Overheating
via flame detector
Check the heater inlet and outlet pipes for free inflow and
outflow of air.
Check the combustion air supply system and the gas
exhaust pipe.
Repeat the starting procedure for heater cooling.
13*
Flameout in
combustion
chamber due to
voltage drop
Check the battery and wiring. (Voltage drop can be caused
by long operation of the electric starter).
14*
Overheating
inside the heater
in the area of the
heated air outlet
temperature
sensor
Check the heater inlet and outlet pipes for free inflow and
outflow of air.
16* Heater is
locked** To unlock the heater contact a service center.
* only for PLANAR-8DM type air heaters
** Attention! ** If the “Overheating” error appears three consecutive times during heater
startup or operation, it will be locked. The locking is activated due to overheating, regardless
of which sensor that detected the errors. In case of lock, the control panel LED will blink 16
times. To unlock the heater, contact a service center.

9
Table 2
Number
of blinks Malfunction description
4 Glow plug fault
5 Flame detector fault
6 Malfunction of control unit integrated temperature sensor
7 Fuel pump fault
11
Air blower fault. Speed of fan is lower than rated.
The motor does not rotate.
The motor rotates uncontrollably.
15* Malfunction of heated air outlet temperature sensor
17* Body temperature sensor circuit break
19* Sensor design is altered
20* Flame detector temperature exceeds the normal value
* - only for PLANAR-8DM type air heaters
Autoterm LLC
Trikatas street 4, Riga, LV-1026, Latvia
[phone]
E-mail: [e-mail]
Skype: autoterm-europe
Technical support 24/7
[phone]
Е-Mail: [e-mail]
Skype: autoterm europe service