THERMO 2000 VENTUM User manual

VENTUM
HYDRONIC HYDRONIC
AIR-HANDLER
INSTALLATION AND OPERATION MANUAL
Your VenTum hydronic hydronic air-handler has been carefully assembled and factory-tested to
provide years of trouble-free service. The following information and safety measures are provided
to ensure proper installation, operation, and maintenance of this product.
It is imperative that all persons who are expected to install, operate or make adjustments to this
unit read these instructions carefully.
Any questions regarding this hydronic air-handler’s operation, maintenance, servicing or warranty
should be directed to the supplier.
When all the installation steps have been completed, keep this installation manual in a safe place
(near the unit) for future reference.
THERMO 2000 Inc. Revised: June 2021
Printed in Canada

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 2
TABLE OF CONTENTS
TECHNICAL SPECIFICATIONS.............................................................................................4
INTRODUCTION.....................................................................................................................7
LOCAL INSTALLATION REGULTIONS.............................................................................................7
CORROSIVE ENVIRONMENT...........................................................................................................7
INSPECTION UPON RECEPTION ....................................................................................................7
TO VERIFY.........................................................................................................................................7
INSTALLATION.......................................................................................................................8
SAFETY MEASURES.........................................................................................................................8
LOCATION..........................................................................................................................................8
CLEARANCES ...................................................................................................................................8
POSITIONING ....................................................................................................................................9
HYDRONIC AIR-HANDLER MECHANICAL INSTALLATION............................................................9
Heating coil............................................................................................................................9
Ventilation connections .......................................................................................................10
Air-conditioning coil.............................................................................................................10
Temperature sensors..........................................................................................................10
Blower .................................................................................................................................12
Filter ....................................................................................................................................12
Pump...................................................................................................................................12
ELECTRICAL CONNECTIONS........................................................................................................12
Hydronic air-handler power supply......................................................................................12
Thermostat connection........................................................................................................14
24VAC accessories connection ..........................................................................................16
OPERATION.........................................................................................................................17
DIGITAL CONTROLLER..................................................................................................................17
SETTING THE PARAMETERS........................................................................................................17
SEQUENCES OF OPERATION.......................................................................................................23
Heating request...................................................................................................................23
Air-conditioning request ......................................................................................................23
Continuous ventilation request............................................................................................23
Dehumidification request.....................................................................................................23
Zone mode..........................................................................................................................23
Stagnant water circulation...................................................................................................23
Air-conditioning coil freeze protection.................................................................................23
Building freeze protection....................................................................................................24
Domestic hot water priority..................................................................................................24
Overheating protection........................................................................................................24
START-UP............................................................................................................................25
PREPARATORY STEPS..................................................................................................................25
CHECKING OPERATION.................................................................................................................25
MAINTENANCE....................................................................................................................26
INTRODUCTION ..............................................................................................................................26
At all times...........................................................................................................................26
Annually...............................................................................................................................26
TROUBLESHOOTING..........................................................................................................27
TROUBLESHOOTING......................................................................................................................27
COMPONENTS................................................................................................................................30
VENTUM LIMITED WARRANTY................................................................................................................31
COOLING COIL COMPATIBILITY LISTING...............................................................................................32

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 3
TABLE OF TABLES
Table 1 : Technical specifications by model .................................................................................................4
Table 2 : VenTum 40 hydronic air-handler heat exchange performance*....................................................6
Table 3 : VenTum 60 hydronic air-handler heat exchange performance*....................................................6
Table 4 : Maximum installation distance.......................................................................................................9
Table 5 : Filter dimensions by model ..........................................................................................................10
Table 6 : Legend of installation examples...................................................................................................12
Table 7 : Legend of available connections..................................................................................................13
Table 8 : Description of digital display symbols..........................................................................................17
Table 9 : VENTUM 40 Parameters .............................................................................................................21
Table 10 : VENTUM 60 Parameters ...........................................................................................................22
Table 11 : Hydronic air-handler components..............................................................................................30
TABLE OF FIGURES
Figure 1: VenTum 40 dimensions.................................................................................................................5
Figure 2: VenTum 60 dimensions.................................................................................................................5
Figure 3: integrated pump performances......................................................................................................6
Figure 4 : Possible hydronic air-handler configurations................................................................................9
Figure 5 : Possible hydronic air-handler orientations....................................................................................9
Figure 6: Typical installation of a hydronic air-handler unit with boiler and radiant heating .......................11
Figure 7: Typical installation of an hydronic air-handler unit with instantaneous water heater ..................11
Figure 8: Electrical diagram with digital controller.......................................................................................13
Figure 9: Connection diagrams according to the type of system................................................................15
Figure 10: Example of connection with heat pump, auxiliary boiler and motorized valve ..........................16
Figure 11: Digital controller interface ..........................................................................................................17
Figure 12 : VenTum interior view................................................................................................................30

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 4
TECHNICAL SPECIFICATIONS
Table 1 : Technical specifications by model
VenTum 40
VenTum 60
Fan
Maximum CFM
1100 CFM
2000 CFM
Max. external static pressure
0.75 in w.c.
0.75 in w.c.
Fan wheel
9 in. x 6 in.
10 in. x 10 in.
Fan motor
ECM ½ HP
ECM ¾ HP
Motor amperage @ 1050 RPM
7.7 A
9.6 A
Motor power supply
120V/60Hz/1PH
120V/60Hz/1PH
Pump
Motor
3-speed 1/25 HP
Fluid max temperature.
200°F (93°C)
Max. operating pressure
145 psi (1000 kPa)
Amperage (loaded / Locked)
0.75A / 4.44A
Motor power supply
120V/60Hz/1PH
Radiator
Construction
Copper tubes, galvanized steel support, aluminum fins
Dimensions effectives (PxLxE)
15 in. x 18 in. x 3.5 in.
15 in. x 22 in. x 3.5 in.
Fins
14 fins/inch
Copper tube
3/8 in. x 0.014 in. copper
Pressure loss @ 5 gpm
4.5 psi
5 psi
Max. operating pressure
150 psi (1034 kPa)
Max. operating temperature
200 °F (93°C)
Approved heat transfer liquid
Water, max 50% propylene glycol, Domestic water
Connections
¾'' copper piping

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 5
Figure 1: VenTum 40 dimensions
Figure 2: VenTum 60 dimensions
Filter
16" x 20" x 1"
Filter
20" x 20" x 1"

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 6
Figure 3: integrated pump performances
Table 2 : VenTum 40 hydronic air-handler heat exchange performance*
Water Flow
3 GPM
5 GPM
Water supply
temperature
PCM
PCM
700
800
900
1000
1100
700
800
900
1000
1100
Heating
exchange
capacity
(BTU/H)
100 °F
13400
14400
15400
16500
17500
16400
17700
19100
20400
21700
120 °F
24400
26300
28200
30100
31900
27200
29800
32400
35000
37700
140 °F
35500
38200
41000
43700
46400
38500
42200
45900
49600
53200
160 °F
47400
51400
55300
59300
63200
49700
54300
59000
63600
68200
180 °F
50600
55000
59300
63700
68100
60200
67000
73800
80600
87400
200 °F
68800
74000
79200
84500
89700
72000
79100
86200
93300
100400
Air-
conditioning
Tons
2
2
3
3
3
2
2
3
3
3
* The performances are established based on an air temperature of 70 °F (21 °C)
Table 3 : VenTum 60 hydronic air-handler heat exchange performance*
Water Flow
3 GPM
5 GPM
Water supply
temperature
PCM
PCM
1200
1400
1600
1800
2000
1200
1400
1600
1800
2000
Heating
exchange
capacity
(BTU/H)
100 °F
18800
19700
21700
23900
26000
23000
24200
26900
29600
32300
120 °F
35900
37900
41300
44500
47400
40000
43000
47400
51700
56000
140 °F
54500
59900
65500
70800
76300
59100
66200
73300
80400
87500
160 °F
70600
78900
86700
94900
102900
74000
83300
92500
101800
111000
180 °F
77300
84500
91400
98400
105500
92000
102900
113700
124500
135400
200 °F
106000
116900
127800
138800
149500
110900
125000
139100
153200
167300
Air-
conditioning
Tons
3
4
4
5
5
3
4
4
5
5
*The performances are established based on an air temperature of 70 °F (21 °C).

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 7
General Safety Precautions
Be sure to read and understand this entire Installation & Operation Manual before attempting to
install or to operate this hydronic air-handler. Pay particular attention to the following General
Safety Precautions. Failure to follow these warnings could cause property damage, bodily injury or
death. Should you have any issues understanding the instructions in this manual, STOP, and get
help from a qualified installer or technician.
INTRODUCTION
These important safeguards and instructions appearing in this manual are not meant to cover all
possible conditions and situations that may occur. It should be understood that common sense,
caution and care are factors which cannot be built into every product. These factors must be
supplied by the person(s) caring for and operating the unit.
LOCAL INSTALLATION
REGULATIONS
This hydronic hydronic air-handler must be
installed in accordance with these instructions
and in compliance with local codes, or in the
absence of local codes, with the National Building
Code and the National Electric Code, current
editions. In any case in which this manual’s
instructions differ from local or national codes, the
local or national codes take precedence.
CORROSIVE ENVIRONMENT
The hydronic air-handler must not be installed
near an air duct supplying a corrosive
atmosphere or with a high humidity content.
When a defect in the hydronic air-handler is
caused by such conditions, the warranty will not
apply.
INSPECTION UPON RECEPTION
Inspect the hydronic air-handler for possible
shipping damage. The manufacturer’s
responsibility ceases upon delivery of goods to
the carrier in good condition. The consignee must
file any claims for damage, shortage in
shipments, or non-delivery immediately against
carrier.
TO VERIFY
Please refer to the identification plate on the unit
to make sure you have the right model in hand.
Make sur that nothing is inside the blower
wheel such as sensors, cables or exterior
contaminants before installing the unit.
!
WARNING
!
The following parts are included with the
unit:
•Filter rack
•Temperature sensors (inside the
unit, to be positioned inside ducts)

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 8
INSTALLATION
The manufacturer’s warranty does not cover any damage or defect caused by installation or use of
any parts other than those authorized by the manufacturer into, onto, or in conjunction with the
hydronic air-handler. The use of such unauthorized devices/equipment/parts may shorten the life
of the unit and be dangerous. The manufacturer disclaims any responsibility for such loss or injury
resulting from the use of such unauthorized devices/equipment/parts.
SAFETY MEASURES
This hydronic air-handler is designed to be
installed on a network operating between 50 °F to
200 °F (15 °C to 95 °C) and at a maximum
operating pressure of 145 psi (1000 kPa). It is
designed for use in a closed-loop hot water
heating system, domestic hot water heating
system or with an outdoor air conditioning unit
such as an air conditioner or a heat pump.
The addition of an air conditioning coil at the
outlet or return of the hydronic hydronic air-
handler is possible on the job site in combination
with an outdoor unit. All safety measures relating
to equipment combined with the VenTum
hydronic air-handler must be respected
according to the various manufacturers’
requirements.
The power delivered by the hydronic hydronic air-
handler depends on the temperature of the water
circulating in the coil, the water flow rate and the
fan speed.
The cooling capacity of the exterior unit shall not
be rated over the maximum capacity of the
VenTum unit. The maximum cooling capacity for
the VenTum 40 model is 3 tons and 5 tons for the
VenTum 60 model.
It is the installer's responsibility to ensure that the
safety devices required by local standards are in
place (a safety valve on the hot water supply
system, for example).
LOCATION
The VenTum must be installed in a clean and dry
location. Long hot water lines must be insulated
to ensure low energy losses. The boiler and water
lines must be protected from freezing.
The hydronic hydronic air-handler can be
installed vertically or horizontally (see Figure 4
and 5). The unit must be leveled.
The hydronic hydronic air-handler must be away
from probable physical damage such as moving
vehicles, floods, etc. Every model can be installed
on a combustible surface. The location must be
ventilated enough to maintain an ambient
temperature under 90 °F (32 °C).
The VenTum hydronic hydronic air-handler is
designed for indoor installation only.
The hydronic air-handler should not be
located in an area where leakage from its tank
or water connections will result in damage to
the adjacent area or to lower floors of the
structure. When such areas cannot be
avoided, install a suitable drain pan or non-
flammable catch pan under the unit to collect
the water. The pan must be connected to a
drain.
NOTE: The auxiliary catch pan MUST conform
to local codes.
CLEARANCES
The minimum clearances required for inspection
and servicing are as follows:
Combustible
surfaces
Servicing
Left side
6”
6”
Right side
0’’
6”
Above
0’’
0”
Underneath
0’’
0”
Behind
0’’
0”
In front
0’’
24”
If the hydronic air-handler unit is installed in an
enclosed space, provide a service access
opening and adequate ventilation to keep the
ambient temperature below 90 °F (32 °C).
WARNING
!
WARNING
!

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 9
POSITIONING
Figures 4 and 5 represent installation options for
the VenTum hydronic air-handler. It can be
installed directly on the floor, on a plenum, or
hung from the ceiling. It is the installer's
responsibility to properly secure the VenTum
hydronic air-handler to the ceiling if this type of
installation is required.
The supports for the ceiling must be provided on
the site and selected according to the
dimensions and mass of the unit.
Figure 4 : Possible hydronic air-handler configurations
HYDRONIC AIR-HANDLER
MECHANICAL INSTALLATION
Heating coil
The plumbing connections on the coil of the
VenTum unit are ¾” diameter plumbing copper
tubing. If the copper tubing is to be connected to
a steel pipe, it is recommended to use a dielectric
connection to prevent galvanic corrosion.
A drain valve is required at the coil outlet so that
it can be drained in the event of work being done
on the unit. It is essential to have a way to purge
the air from the system and to be able to drain
water from it when necessary.
A check valve is included in the pump connection
leading to the radiator.
The maximum water flow through the coil should
not exceed 10 GPM. In a standard installation,
the flow rate obtained by the pump included in the
unit should be approximately 5 GPM. Table 4
presents an approximate maximum distance from
the boiler that the VenTum unit should be
installed depending on the piping diameter
Table 4 : Maximum installation distance
Pipe size
Approx. distance to
maintain 5 GPM
¾ "
7 ft (2 m)
1 "
38 ft (11 m)
1 ¼ "
100 ft (30 m)
The heating coil is made of materials compatible
with drinking water. The welds are made with
lead-free filler material and the copper pipes are
manufactured in accordance with ASTM B-88.
The coil is equipped with high-density aluminum
fins to obtain maximum heat exchange for a
compact size.
It is necessary to flush the heating coil before
starting the unit in order to eject deposits that may
Figure 5 : Possible hydronic air-handler orientations

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 10
enter it during the manufacture or installation of
the unit.
Ventilation connections
From the factory, the VenTum is configured to
connect the return air duct on the left side of the
unit. If the desired return is below or on the left
side of the unit, simply remove the panel covering
the desired opening of the unit and reinstall it on
the right side to close this opening. Do not forget
to unhook and remove the section of
insulation covering the chosen opening.
The unit’s possible installation configurations are
shown in Figures 4 and 5. An installation that is
not shown in one of the possible configurations
will void the warranty in the event of a defect.
A filter holder is supplied with the unit to make it
easier to connect the return air duct and insert a
filter.
A MERV category 5 or less filter must be installed
at the return air opening using the supplied filter
holder or a field fabricated filter holder depending
on the required filter dimensions. Thermo 2000
suggests replacing this filter every 3 months or as
recommended by the manufacturer of the
installed filter.
Table 5 : Filter dimensions by model
Model
Filter Dimensions
VenTum 40
16" x 20" x 1"
VenTum 60
20" x 20" x 1"
All ventilation ducts must be designed in
accordance with good practice and applicable
ventilation codes to reduce the risk of ventilation
noise and excessively high pressures. The AHRI
"J" and "D" manuals are indicated for the design
of ventilation ducts.
The plenums must be manufactured on site to the
dimensions of the VenTum unit’s connection
flanges (see figures 1 and 2). The air outlet
plenum should ideally consist of a straight section
of at least 1 meter (3 feet) before adding
branches or curves.
It is recommended that the ventilation ducts be
insulated with 1 inch (1”) fiberglass insulation and
vapor barrier to reduce the risk of noise and
excessive condensation on the duct surfaces. It
is generally recommended not to exceed an air
speed of 3 m/s (600 ft/min) in the ventilation ducts
to reduce the risk of noise.
The total external static pressure must not
exceed 0.75 in water column.
Air-conditioning coil
An air-conditioning coil can be paired with the
VenTum unit. Compatibility is possible with a heat
pump or air conditioner type outdoor unit only.
The air conditioning coil (not supplied by Thermo
2000) must be installed in accordance with the
standards in force as well as the manufacturer's
recommendations. A drainage pan MUST be
installed with an air-conditioning coil so that the
condensation drains into a drain provided for this
purpose. Condensation from the air-conditioning
coil must not drip into or onto the VenTum fan coil.
An installation without a drain pan will void the
warranty.
The air-conditioning coil can be installed
upstream or downstream of the fan coil. In order
to reduce any risk of the hot water heating
radiator freezing, Thermo 2000 recommends
installing the said air-conditioning coil
downstream (at the air outlet) of the VenTum
hydronic air-handler. If a heat pump is installed
for heating purposes, the heating efficiency will
be higher with the coil upstream of the hydronic
air-handler.
It is important to position the air outlet
temperature sensor as described in the following
Section (3.5.4.)
Temperature sensors
The VenTum hydronic air-handler has three (3)
temperature sensors, two (2) of which must be
positioned during installation. The sensor marked
"Sortie Air / Air output" must be installed at least
30 cm (12 in) after the heating coil or,
downstream of the air-conditioning coil (if such a
coil is installed above the heating coil) (see
position 14 on figure 6). If an air-conditioning coil
is installed upstream of the heating coil, install the
sensor as indicated after the heating coil. In the
event where the cooling coil is located in the
return air duct, the sensor marked “Entrée Air / Air
Input”must be relocated before the cooling coil
(see postion 22 on figure 6).
The reading of the air outlet temperature is used
for the correct operation of the unit and to
prevent:
•Freezing of the heating coil.
•Freezing of the air-conditioning coil,

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 11
•The distribution of air that is too hot in the
air-conditioned space.
Breakdown caused by the incorrect placement of
the air outlet temperature sensor will void the
warranty.
Figure 6: Typical installation of a hydronic air-handler unit with boiler and radiant heating
Figure 7: Typical installation of a hydronic air-handler unit with instantaneous water heater
1
2
3
4
13
15
19
18
17
8
12
10
6
7
5
11
9
20
21
14
1
4
14
16
8
22
22

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 12
Table 6 : Legend of installation examples
No.
Description
1
Automatic air eliminator
2
Ball valve
3
Boiler
4
Expansion tank
5
Union (dielectric if required)
6
Pressure reducer
7
Non-return valve
8
Domestic cold-water inlet
9
Primary network circulating pump
10
Circulating pump for the radiant floor network (secondary)
11
Thermostatic valve
12
Radiant floor network
13
Air supply plenum
14
Positioning of the air outlet temperature sensor
15
Air-conditioning coil
16
A/C coil drain pan
17
Drain valve for the heating coil
18
Return air plenum
19
Filter and filter holder
20
Instantaneous water heater
21
Check valve
22
Positioning of air inlet sensor if cooling coil is located before the VenTum unit
Blower
The direct drive blower present in the VenTum is
variable speed adjustable through the controller (see
Section 4). The ECM-type motor provides constant
airflow while consuming less energy than fixed-speed
PSC-type motors.
When there is a request for heating, air-conditioning
or continuous ventilation from the thermostat, the fan
will start depending on the configuration made.
Filter
The device has a removable filter holder which must
be installed at the fresh air inlet. Do not install the
filter at the hot air outlet. If an air-conditioning coil
is installed in the fresh air return of the fan coil, the
filter must be installed before it.
It is recommended to clean the filter every month and
replace it every 3 months of use of the unit or
according to the recommendations of the filter
manufacturer.
A filter that is too dirty can cause the air-conditioning
coil to freeze, a lack of comfort in the air-conditioning
space as well as high ventilation noise.
Pump / check valve
The pump integrated into the hydronic air-handler is
a pump with volute in composite material certified
NSF 61 for use with drinking water. The pump
provides circulation for at least 1 minute every 6
hours to prevent water from becoming stagnant in
the heating coil.
By default, the pump speed is factory set to “Hi”.
This can be adjusted to a lower speed directly on the
pump motor head as needed.
ELECTRICAL CONNECTIONS
Hydronic air-handler power supply
Hydronic air-handler wiring and grounding must
comply with the National Electrical Code and local
code. The latter takes precedence.
The power supply is via a 2-wire L1-N conductor with
ground. Simply connect the power supply wires to the
L1-N terminal block of the VenTum and attach the
ground to the ground terminal block.
Figure 8 shows the electrical diagram of the VenTum.
The main power supply of the hydronic air-handler
must be 120VAC/1PH/60Hz.

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 13
Figure 8: Electrical diagram with digital controller
Table 7 : Legend of available connections
Terminal
Description
L1
120 VAC power supply (line)
N
120 VAC power supply (neutral)
GND
Grounding
W1
First stage or zone 1 heating request signal (24VAC)
W2
Second stage or zone 2 heating request signal (24VAC)
Y1
First stage or zone 1 air conditioning request signal (24 VAC)
Y2
Second stage or zone 2 air conditioning request signal (24 VAC)
G
Fan demand signal (24 VAC)
R
24 VAC signal circuit power supply to the thermostat
C
24 VAC common for continuous supply of the thermostat or 24 VAC accessories
O/B
Heat pump 3-way valve supply signal (24 VAC)
HUM
Dehumidification request signal (24 VAC)
Y out
Air-conditioning request signal to the outdoor air conditioning unit
W out
Heating demand signal to the outdoor unit or boiler
Aux
Authorization to start the auxiliary boiler (dry contact)
Aux
Authorization to start the auxiliary boiler (dry contact)
Not Zone 1*
24VAC contact supplied when no request OR request for zone 1
Not Zone 2*
24VAC contact supplied when no request OR request for zone 2
*The "Not Zone 1" and "Not Zone 2" contacts are accessible directly on the green 7-pole connector located on the back of the
controller. No indications are present for these contacts. These contacts can be useful when the VenTum is used in "zone"
mode and you want to connect motorized shutters to it.

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 14
Thermostat connection
Figure 9 represents basic thermostat connections
according to different systems. These connections
may vary depending on the systems and
configuration selected.
.
Single-stage
heating system
Domestic hot water
system
Single-stage heating
system with an outdoor
air conditioning unit

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 15
Figure 9: Connection diagrams according to the type of system
2-stage heat pump system with
back-up boiler
System with heat pump, boiler and 2
zones (2 thermostats)

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 16
24VAC accessories connection
It is possible to use the hydronic air-handler’s 24VAC power supply to power external accessories. For example, a
motorized valve, a motorized damper, etc.
All accessories should not exceed a total of 20VA.
Figure 10 shows an example in which a motorized valve is supplied via the hydronic air-handler to allow zoning to
be made. For example, in this scenario, the motorized valve would be activated when W2 receives 24 VAC.
Figure 10: Example of connection with heat pump, auxiliary boiler and motorized valve
VANNE
MOTORISÉE

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 17
OPERATION
DIGITAL CONTROLLER
The hydronic air-handler is equipped with a digital
controller for simple configuration of the unit at your
fingertips without having to open the unit.
The digital controller has a display interface and 4
buttons as shown in Figure 11.
Figure 11: Digital controller interface
Table 8 : Description of digital display symbols
Symbol
Description
Heating mode
Air-conditioning mode
Fan operating
Pump running on timer
Defrost mode
Alarm
Dehumidification mode
SETTING THE PARAMETERS
Adjusting the unit’s various settings can be done
directly via the controller interface. There are no
adjustments to be made inside the cabinet.
The parameter menus are shown in tables 8 and 9.
The intuitive navigation is done by pressing the
power, up arrow, down arrow and set buttons. To
adjust a desired parameter, simply press “set” and
use the arrows to adjust to the right value. Press “set”
again once the parameter is at the desired value to
save this parameter. Note that holding down an arrow
will increase numbers by steps of 10 and 100. Finally
press on the power button to return to the main menu
or simply wait and the main menu will return
automatically after 30 seconds of inactivity.
The following figures show the intuitive navigation
that is programmed in the controller’s display.

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 18

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 19

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021) 20