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2.7
Supplementary heating
If the performance of the heat pump is not sufficient due to high hot water
use or low ambient temperatures supplementary heating can be used. An
immersion heater is integrated in the product and can be activated in the
control system by choosing HP+EL in the menu "Heat pump". Also external
boilers or solar can be connected to the product (model 301 and 302) via
the internal coil. For this alternative HP+Boil is set in the menu. For electrical
connections and relay outputs see the wiring diagram. The immersion heater
has a built is operational and safety thermostat set at 75/85 °C. With an
external boiler or solar consider the maximum allowed temperature of 75 °C.
When activated, the control system will start the supplementary heating when
the water temperature is 1 degree below T
temperature is 1 degree above T
2.8
Hot water production
Heating of domestic water can be made using the heat pump, immersion
heater and/or boiler/solar. Immersion heater, boiler and solar are described as
supplementary heating. Energy sources are selected in the control system.
They can be selected individually or together (boiler and immersion heater
cannot be chosen at the same time).
Temperature setting range: from 5 °C to T
independently. A normal setting would be T
°C. Setpoint is achieved with the heat pump if allowed. If no heat pump is
selected it is achieved with the supplementary heating. T
heat pump and supplementary heating, if selected.
The heat pump runs with a hysteresis of (+)1 – (-)3 K for the setpoint. The
supplementary heating runs with a hysteresis of (±) 1 K. The heat pump stops
when the evaporator temperature gets too low. The temperature limit for defrost
is -18 °C.
Chosen operating settings are indicated by lamps in the front panel (25, 26).
The upper (25) is for the heat pump and the lower (26) is for supplementary
heating.
2.9
Heating coil
CTC EcoWater (model 301) is equipped with a heating coil with 1 m
surface. When using the coil, thermostats must always be mounted on the
primary flow and the storage to ensure the correct temperature. To ensure
the water capacity the storage temperature must always have the 1st priority.
Additional heat may not exceed 65 °C, higher temperatures can damage the
heat pump circuit.
2.10
Fan control
The fan has 2 speeds which can be adjusted in the menu "FanOper". Normally,
the highest speed should be used (Option 2 in the menu "FanOper" is the high
speed). The noise level can be reduced by decreasing the fan speed. Lower
speed setting can be selected with minor influence of the heat pump efficiency.
With air duct connections the highest speed always must be used. The fan
can, in the "FanCon" always be connected so that a constant ventilation can
be made. The fan will in the setup 0 be disconnected with heat pump. In
setup 1 it runs on low speed and in setup 2 it runs high-speed with heat pump
disconnected.
12
CTC EcoWater
or lower and close it when the
min
.
min
°C. T
and Setpoint can be set
max
min
= 35 °C and setpoint 45 °C to 55
min
is achieved with
min
Off:
Inactive.
Orange:
Activated but in standby
mode.
Green:
Activated.
heat
2
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