Dantherm VentR Manual

1
Installation and service manual
Vent R/C 2/4/6
English
Version 2.5 - 971763

Installation and service manual
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INDEX:
1. GENERAL DESCRIPTION...........................................................................................................11
1.1 UNIT CONSTRUCTION ..............................................................................................13
2. TRANSPORT............................................................................................................................22
3. INSTALLATION........................................................................................................................30
3.1 GENERAL................................................................................................................30
3.2 MOVING IN VENT C/R 6..........................................................................................31
3.3 MOVING IN VENT R4..............................................................................................39
3.4 FITTING OF HANDLES...............................................................................................43
3.5 DUCT CONNECTION.................................................................................................48
3.6 CONDENSE DRAIN VENT C......................................................................................51
3.7 FITTING OF ACCESSORIES ........................................................................................57
3.7.1 SUPPLY AIR SENSOR..................................................................................58
3.7.2 ELECTRICAL REHEAT COIL ........................................................................63
3.7.3 WATER REHEAT COIL................................................................................66
3.7.4 MULTI-LEAF DAMPER................................................................................75
3.7.5 ROOF COVER.............................................................................................77
4. ELECTRICAL CONNECTION ......................................................................................................84
4.1 ELECTRICAL CONNECTION OF ACCESSORIES............................................................93
4.1.1 ANALOGUE COOLING SIGNAL....................................................................94
4.1.2 ON/OFF SIGNAL FOR EXTERNAL COOLING PLANT.....................................95
4.1.3 FAN RUNS SIGNAL .....................................................................................97
4.1.4 START/STOP SIGNAL FOR CIRCULATING PUMP............................................98
4.2 ELECTRICAL CONNECTION OF ACCESSORIES..........................................................102
5. START-UP .............................................................................................................................108
5.1 FACTORY SETTINGS...............................................................................................117
5.2 CONFIGURATION SETTINGS ...................................................................................121
5.3 RUNNING CONDITION............................................................................................129
6. SERVICE AND MAINTENANCE................................................................................................134
6.1 FILTER ..................................................................................................................137
6.2 ROTARY HEAT EXCHANGER -VENT R...................................................................143
6.3 CROSSFLOW HEAT EXCHANGER –VENT C ............................................................147
6.4 FANS.....................................................................................................................152
7. FINDING ERRORS ON FREQUENCY INVERTER FOR HEAT WHEEL .............................................155
8. INDICATOR LIGHTS AND FAULT SIGNAL OUTPUT....................................................................162
9. COMMISSIONING DIAGRAM...................................................................................................166
10. DECLARATION OF CONFORMITY.............................................................................................27

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1. General
Dantherm heat recovery units type VentR/C are complete ventilation units with frequency-controlled rotary
heat exchanger or cross flow heat exchanger with by-pass, frequency-controlled plug fans, supply air filters
and exhaust air filters as well as a complete, integral electronic control.
Various accessories are offered such as reheat coils for hot water or electricity, multi-leaf dampers, and roof
covering for outdoor installation. This manual is intended for the technician in charge of the commissioning
of the ventilation plant.
1.1 Unit construction
Vent R (pos. left)
1. Fresh air filter F7
2. Exhaust filter F5
3. Supply air fan
4. Exhaust fan
5. Electrical panel and STXC2 print
6. Rotary exchanger
8. Motor for rotary exchanger
Vent C 2/4 (pos. left)
1. Fresh air filter F7
2. Exhaust filter F5
3. Supply air fan
4. Exhaust fan
5. Elec. panel
6. STXC2 print
7. Crossflow heat exchanger
9. By Pass
10. Drip tray with outlet

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Vent C 6 (pos. left)
1. Fresh air filter F7
2. Exhaust filter F5
3. Supply air fan
4. Exhaust fan
5. Elec. panel and STXC2 print
7. Crossflow heat exchanger
9. By Pass
10. Drip tray with outlet

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2. Transport
All Vent units are supplied as complete units. On request, the biggest models Vent R/C 6 can be separated
into three parts, allowing easy transport into plant rooms with limited access.
On delivery the unit is placed in upright position on two crossbeams, allowing the use of a forklift truck, a
pallet lifter or a crane for lifting and transporting the unit. If a crane is used, ensure that the unit remains in
balance. Before placing the unit in its final position, remove the crossbeams and fit the height-adjustable
feet to the base frame.
IMPORTANT:
Adjustable feet, which are delivered with the unit, must be fitted before the final positioning! Once the
feet are fitted, the unit must not be pushed any more, only lifted, otherwise the feet will bend or break off.

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3. Installation of the unit
3.1 General
To avoid vibrations being transmitted to other objects in the room, the unit should be placed on a hard, level
and stable surface.
Make sure that there is a free access to the inspection doors and that they can be fully opened.
3.2 Moving in Vent C/R 6 units
The Vent R/C 6 is delivered as ready-mounted units. If it proves necessary to dismount part of the unit to get
it through the door opening, the following procedure is recommended:
Loosen the screws of the base frame (1)
Remove the cables from the fans (2)
Remove the measuring hoses from the fans (3)
Loosen the fixing screws in the four corners of both fan modules. (4)
Remove measuring hoses, electric cable and rubber entry from fan section (5)
To reassemble the unit follow the same procedure in the opposite order.

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3.3 Moving in Vent R 4 units
If the overall dimensions of VentR 4 are too big to allow transport through the door opening, the cover
panels in front of and behind the rotary heat exchanger can be temporarily dismounted thus reducing the
overall width of the unit to less than 890 mm.
3.4 Fitting of handles
For transport reasons the handles are not fitted from the factory. Fit one handle with lock and one without in
each door. The handle (1) is fixed to the lock with the screw (2), and the plastic blinder (3) is pressed into
the handle.

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3.5 Duct connection
The duct connections are marked with descriptions of the four airflows for easy and unproblematic
connection.
Circular duct connections are supplied with rubber sealing gaskets, allowing connection of a duct direct on
the connecting piece of the unit. The Vent R/C 6 unit must be supplied with a duct transition piece on the
filter side, as the duct connection on this side of the unit is rectangular in order to provide the best possible
air distribution through the filter. Rectangular ducts can be used as an alternative.
For the sake of pressure drop and air velocity in the duct it is recommended that ducts have the same
dimensions as the connecting pieces of the unit. The dimensions of the connecting pieces are:
Vent R/C 2 Ø 315 mm
Vent R/C 4 Ø 400 mm
Vent R/C 6 Ø 500 mm
3.6 Condense drain Vent C
If the exhaust air from Vent C units with cross flow heat exchanger has a high relative humidity, condense
water may be created during the passage of the air through the heat exchanger. Therefore a condense tray is
fitted under the exhaust side of the heat exchanger for collection of condense water. The water tray has a 12-
mm drain pipe, which is located on the inspection side of the Vent C unit. A water trap must be fitted in the
drainpipe to allow the water to run off.

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3.7 Fitting of accessories
The Vent unit can be supplied with various accessories. The accessories (except for the supply air sensor)
are delivered together with the unit, but separately packed.
3.7.1 Supply air sensor
The supply air sensor (black) is ready-mounted in the unit when delivered from the factory. The sensor is led
out of the unit next to the main switch. The sensor is to be fitted in the supply air duct at a distance of min.
1,5 m from the Vent unit. If the unit has a reheat coil the sensor must be fitted at a distance of min. 1,5 m
from the reheat coil. To fit the sensor, proceed as follows:
Mark the wanted position on the duct and drill a 10 mm hole.
Fix the sensor by means of four self-cutting screws.
3.7.2 Electric reheat coil
If an electric reheat coil is delivered with the unit, the connecting dimensions of the reheat coil are the same
as the connecting dimensions of the Vent unit. Thus the reheat coil can be connected direct on the supply air
duct. Make sure that the arrow of the reheat coil is pointing in the same direction as the airflow.
Then connect the control cable to the socket in the Vent unit’s control panel. Please also see Section 5.
If a reheat coil for electricity is fitted, dipswitch No. 6 must be set to position ON. The dipswitch is found
on the STXC2 print circuit board of the unit. (For further information’s see 4.2)

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3.7.3 LPHW reheat coil
If a reheat coil is delivered with the unit, the connecting dimensions of the reheat coil are the same as the
connecting dimensions of the Vent unit. Thus the reheat coil can be connected direct on the supply air duct.
For transport reasons the frost thermostat with connection box (1) is not fitted from the factory. It is fixed to
the water heating coil by the enclosed screws. Then fit the capillary sensor of the frost thermostat (2) by
means of the enclosed fittings, so that the sensor is placed behind the heating coil (in the air direction).
Finally fit the heating coil onto the Vent unit and plug the control cable (3) into the control panel of the Vent
unit. Please also see Section 5.
Valve motor for control of the hot water quantity may now be connected to the terminal strip under the frost
thermostat (1). Please also see the wiring diagram.

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3.7.4 Multi-leaf damper
If a multi-leaf damper is delivered with the unit, the connecting dimensions of the multi-leaf damper are the
same as the connecting dimensions of the Vent unit and therefore the damper can be connected direct on
supply and exhaust air ducts, respectively.
The rectangular multi-leaf damper, which is available as an extra accessory for the Vent 6 units, is mounted
directly on the suction spigot of the unit by means of four machine screws. The electrical connection is
described under point 4.1
3.7.5 Roof covering
If the unit is to be placed outdoors, it has to be supplied with a roof covering (1) and a shielding for
protection of the electrical control panel (2). The roof covering is supplied in one piece and is fitted to the
unit with the delivered machine screws.
The shielding of the control panel is fixed to the unit by means of the same four screws keeping the control
panel in place.

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4. Electrical connection
The mains power supply is connected direct to terminal (X1) in the control panel of the ventilation unit in
the following way:
VentR:
Loosen the four screws keeping the control panel and remove it. Take the connection cable through the PG
gland and connect it to the terminal X1.
VentC 2/4:
To gain access to terminal X1 open the door beside the control panel. It is now possible to remove the side
cover panel which is fastened by four screws. Take the connection cable through the PG gland and connect
it to the terminal X1.
VentC 6:
The six screws holding the cover beside the control panel are loosened and the cover is removed. Take the
connection cable through the PG gland and connect it to the terminal X1.
The mains connection can be 1N~ PE 230V or 2N~ PE 400V. The standard ventilation unit from the factory
has a mains power supply of 2N~ PE 400V.
Maximum consumption in a VentR ventilation unit
1N~ PE 230V
2N~ PE 400V
VentR
P
[kW]
I
[A]
Fuse
[A]
P
[kW]
I
[A]
Fuse
[A]
2
1,2
9,8
10
1,2
4,9
10
4
2,3
16,8
20
2,3
8,4
10
6
3,1
24,0
25
3,1
12,0
16
Maximum consumption in a VentC ventilation unit
1N~ PE 230V
2N~ PE 400V
VentC
P
[kW]
I
[A]
Fuse
[A]
P
[kW]
I
[A]
Fuse
[A]
2
1,1
8,8
10
1,1
4,9
10
4
2,2
15,8
20
2,2
8,4
10
6
3,0
23,0
25
3,0
12,0
16
Earth Leakage Circuit Breaker
If an earth leakage circuit breaker (ELCB) is used as additional protection, it must be of the type that trips
out when earth fault currents with DC content (pulsating DC) occur. The earth leakage circuit breakers must
be marked with the following symbol:
Connection of protected earth
Concerning resistance to static electricity it is recommended that the cabinet of the MMI STCU be
connected to a protected earth. Possibly the same for the flow-chart cabinet STLD.
NOTE: Observe local power supply company regulations!

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4.1 Electrical connection of accessories
The electrical connection of accessory control current is done directly on the STXC2 print in the Vent unit
(except for the reheating coils, which are connected by plug). In the VentR 2/4/6 and VentC 6 the STXC2
print is located behind the control panel, and in the VentC 2/4 under the exhaust filter (see Section 1.1).
4.1.1 Analogue cooling signal
If a cooling coil is connected to the ventilation unit, this can be controlled from the unit controller (2-10 V
control signal).
The control signal disconnect (0 V) if the outdoor temperature is below 14 °C or if the supply air
temperature is below set point for minimum supply air temperature.
4.1.2 ON/OFF signal for external cooling plant
The controller is equipped with an ON/OFF output for external cooling plant. 24 V AC at calculated cooling
demand above 20 %. At decreasing cooling demand, the output deactivate again, when the cooling demand
hass decreased to below 5 %.
4.1.3 Fan runs signal
ON/OFF output for external use. This output (24 V AC) will be activated when the fans run and there are no
error messages.
4.1.4 Start/stop signal for circulating pump
ON/OFF signal (24 V AC) for circulating pump for reheating coil. On when operation is needed. The
circulating pump will be activated when there is a need for reheating. The pump will also be activated 5
minutes once per month.

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4.2 Electrical connection of accessories
In the VentR 2/4/6 and VentC 6 the STXC2 print is located behind the control panel, and in VentC 2/4
under the exhaust filter. From the factory the DIP-switch on the STXC2 control print inside the unit has the
following pre-settings:
DIP-switch
DIP-switch position
Function
1
OFF
ON
No compressor
Compressor installed (Not used in Vent units)
2
OFF
ON
Rotating heat exchanger (Vent R)
Crossflow heat exchanger (Vent C)
3
OFF
ON
Vent fan control
Not used in Vent units
4
OFF
ON
Vent fan control
Not used in Vent units
5
OFF
ON
LPHW preheat or no preheat connected
El-preheater connected
6
OFF
ON
LPHW afterheating or no afterheating connected
El-afterheating coil connected
7-8
Not used
8
The potentiometer XP for the temperature control’s XP band on the STXC2 control print is factory set to the
maximum (equal to 50°C). The setting can be changed between 5 and 50°C according to demand.
The potentiometer PREHEAT for control of a pre-heating coil may be set between -10 and +10°C. If no pre-
heating coil is used, the setting of the potentiometer is irrelevant.

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5. Start-up
The unit can be started when all installations and connections have been made. Close all inspection doors
and start the unit on the main switch (1). Then choose operational mode on the functional switch (2).
”0” In this position the unit is closed
”MAN” In this position the unit can work without the control unit and without any pre-programming. The
unit then works according to a so-called emergency program. Please see the User’s manual.
”AUTO” In this position the unit works in accordance with the settings of the control unit. Use the ”AUTO”
position for normal operation.
Further instructions about start up and especially about programming and control of the required running
parameters can be found in the ”User’s Manual”, which is delivered packed together with the unit.
The socket (3) is for connection of the control current of the electric and water heating coils. Please also see
Section 3.7.2 and 3.7.3.
The remaining start-up, especially the programming of the control of the required operational parameters, is
described in the ”User’s Manual”, delivered together with the unit.

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5.1 Factory settings
By pressing the Man, Auto and Enter buttons at the same time and holding for 10 seconds the factory
default settings for the control system are reverted to. Default values for the ventilation units are as follows:
2:
4:
6:
Air volume K_value: A factor for the installed EC fan.
Pa/Volt: A factor used for air filter condition monitoring.
Max Volt: Maximum control signal (0-10V), where the fan motor has reached it’s highest
RPM.
Monday 12:21
Factory menu
Air volume K_value 0073
Pa/Volt 0178
Max Volt 09,5
Monday 12:21
Factory menu
Air volume K_value 0090
Pa/Volt 0231
Max Volt 09,5
Monday 12:21
Factory menu
Air volume K_value 0105
Pa/Volt 0272
Max Volt 09,5
0070
0095
0121

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5.2 Configuration settings.
By pressing the keys Man and Auto at the same time and holding for 5 seconds the configuration settings
for the control system are selected.
Exhaust volume:
Choose a value between 80 and 120 [%] for the extract air volume as a proportion of the supply air volume.
If the communication module STIO is connected, the potentiometer adjustment DIF EXH FAN on the
module will override the setpoint for the extract air volume.
Humidity sensor:
YES: A humidity sensor is connected. If the humidity sensor senses humidity above the set point,
more fresh air is a supplied (damper equipped with modulating damper motors 0-10V). The
fan speed rises.
NO: No humidity sensor is connected.
Automatic filter surv.:
YES: Software checks filters dirty condition. Automatic filter monitoring.
NO: No software check. No filter monitoring. Se User’s guide section 2.4 Filter configuration for
further information.
Low temp. reduc.:
YES: Reduction of ambient air volume when the supply air temperature is below the minimum
supply temperature setpoint (5 - 40°C).
NO: No reduction.
Temp. Ctr. sensor:
A: Automatic temperature shift.
Winter: Ambient air temperature below 14°C. Control as a function of the supply sensor.
Summer: Ambient air temperature above 15°C. Control as a function of the return air sensor.
R: Temperature control related to the return air sensor - constant room temperature.
S: Temperature control related to the supply sensor - constant supply air temperature.
Preheat:
NO: No pre-heater coil is connected.
YES: A pre-heater coil is connected.
Fresh air damper:
NONE: No damper motor is connected.
ON/OFF: An ON/OFF damper motor is connected.
0-10V: Modulating (0-10V) damper motor is connected.
Monday 12:21
Configuration menu
Exhaust volume 100
Humidity sensor YES
Auto filter surv. YES
Low Temp. reduc. YES
Temp. Ctr. sensor A
Preheat NO
Fresh air damper 0-10V

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Important!
After changing a parameter, press Enter to save the new value.
5.3 Running condition
The actual running condition can at any time be read in the MMI STCU. From the main menu the sub menu
Technical data is selected. The sub menu Processor is selected.
The menu point Mode provides information about the actual running condition as a number between 0 and
9:
0: The ventilation unit is stopped.
2: The ventilation unit runs with the function cooling at summer nights.
4: Auto, ventilation unit controlled by the MMI STCU.
5: Man., ventilation unit controlled by the function switch S1 in position MAN.
6: After run on fans.
7: Fan failure.
8: Fire thermostat failure.
9: Frost thermostat failure.
Run time 00023
Comm error % 034
STCU CpuVer 017
STXC CpuVer 015
STPT CpuVer 011
STHP CpuVer
STIO CpuVer 021
Mode 9
Main menu Monday 12:21
Technical data
Processor

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6. Service and maintenance
The Vent unit must be stopped on the breaker contact on the control panel and then on the main/service
switch on the Vent unit itself before carrying out any service. Do not open the inspection doors before the
fans have stopped completely!
In general service has to be carried out at following intervals:
Component
Every 6 month
Every 12 month
Section
Filter
Inspection, replacing, if necessary
Inspection, replacing, if necessary
6.1
Rotary heat exchanger
Inspection of rotor, cleaning if
necessary
Cleaning of rotor
Inspection of sealing
Inspection of drive
6.2
Cross flow heat
exchanger
Inspection of heat exchanger,
cleaning if necessary
Cleaning of heat exchanger.
Inspection of by-pass damper
6.3
Fan
-
Cleaning of running wheel
Checking up on imbalance
6.4
6.1 Filter
If the automatic filter guard is activated in the control system, the filter has to be changed when the filter-
warning lamp is on. If the automatic filter guard is not activated, filters have to be checked and perhaps
replaced every 6 month.
Always replace filters with another filter of the same quality, i.e. filter class F7 on the fresh air side
and filter class F5 on the exhaust air side.
To replace filters, proceed as follows:
Open the filter inspection doors
Open the eccentric clamping mechanism using the blue handles at top and bottom
on the filters. Pull out the filters.
The filter module can be cleaned on the inside with a vacuum cleaner if it is dirty.
Insert new filters. Check that the vertical frames of each filter have a seal.
Squeeze the filters slightly and close the eccentric clamping mechanism using the
blue handles.