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Installation:
•
The Exhaust fan module is delivered dismounted on
the same pallet than the main unit. (See fig ....)
•
The Exhaust module as to be installed on the
exhaust section. (See fig...)
•
The exhaust module electrical wiring has to be
connected to the main unit. (See fig)
Exhaust fan speed setting:
•
Step 1 : adjust the unit fan speed @ the nominal
flow rate using the optional service terminal.
•
Step 2 : adjust the exhaust fans speed using
optional service terminal to reach right amount of
exhaust air.
Hot Water Coil (HWC)
Figure 20 - Hot water coil location in the unit
HWC applies when additional heat is required. Hot
water comes from external boiler or other device. HWC
provides heating with a coil located after the indoor coil
and offer full modulation heating control through the
use of a 3 ways valve. Control is based on mixed air
temperature and zone temperature.
Factory setting is given to heat pump operation. Hot
water is called in addition. Priority can be switched on
site.
Antifreeze protection opens the 3 ways valve when the
coil temperature is closed to the freezing point (2°C).
In antifreeze mode, unit operating, indoor fan is stopped
and unit locked out in manual reset. Fresh air damper
is closed and the modulating valves open. The freeze
protection works with manual reset.
Important notice: it is important that the pump
circulating hot water is permanently working to
avoid water to freeze in the coil. Otherwise, in order
to prevent water from freezing in the coil during
unoccupied period or shutdown limited period, it is
recommended to use ethylene glycol. The service of a
water treatment specialist is recommended as water
used can cause scaling deposits, erosion or corrosion.
Insulate and proceed to heater wire installation on
all the water piping likely to be exposed to freezing
temperatures in order to avoid freeze up of the coil
and heat losses. The water distribution network must
be fitted with vents in places where air is likely to
be trapped.
RT-SVX056D-GB
Table 5 - Ethylene glycol percentage
Ethylene glycol
Freezing point
percentage
(%)
(°C)
10
20
Water connections dimensions and characteristics
Figure 21 - Hot water coil view and connections
Water inlet/outlet
connection 1"1/2
ISO 228/1
The hot water coil is factory mounted and placed in the
discharge section. Two holes are provided to connect
the hot water coil. The tubes for entering and leaving
water are equipped with a threaded female connection.
Figure 22
Hot Water Coil Pressure Drop
Pa
160
140
120
100
80
60
40
HW1
20
0
0
1
2
3
4
Electric Heater
Electric heaters are fitted on the supply fan discharge.
Heaters have two heating stages and provided with two
types of overheat thermostats:
•
Automatic reset thermostats which stop the electric
heater when the air temperature rises to 65°C.
Automatic reset at 32°C.
•
The manual reset thermostat which stops the unit
when the air temperature rises to 128°C.
23 - Heater onto unit and heater detail
Figure
-4
-10
Outlet
Inlet
HW2
5
6
7
8
9
m3/h
10
31
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