Rotex RHYKOMB33AA, Installation And Operation Manual

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9 Operation
Installation and operation manual
24
RHYKOMB33AA
ROTEX HPU hybrid gas boiler module
4P353068-1 – 2013.07
To adjust the carbon dioxide setting
INFORMATION
Only adjust the CO
2
setting when you have checked it first
and are sure adjustment is necessary. No adjustment to
the gas valve should be made without prior permission of
your local Rotex dealer. In Belgium it is NOT allowed to
adjust the gas valve. Contact your dealer.
1
Remove the cap that covers the adjustment screw. In the
illustration, the cover cap is already removed.
2
Turn the screw (a) to increase (clockwise) or decrease
(counterclockwise) the CO
2
percentage. See the table below for
the desired value.
a
a
Adjusting screw
Adjustment values CO
2
(%) at minimum power (front cover
opened)
Measured value at
maximum power Natural gas 2H
(G20) Propane 3P (G31)
10.8 — 10.5±0.1
10.6 10.3±0.1
10.4 10.1±0.1
10.2 9.9±0.1
10.0 9.8±0.1
9.8 9.6±0.1
9.6 9.0±0.1 —
9.4 8.9±0.1
9.2 8.8±0.1
9.0 8.7±0.1
8.8 8.6±0.1
8.6 8.5±0.1
3
After measuring the CO
2
percentage and adjusting the setting,
put the cover cap and the sampling point back in their place.
Make sure they are gastight.
4
Select High setting by simultaneously pressing and twice.
Capital will appear on the service display.
5
Measure the CO
2
percentage. If the CO
2
percentage still
deviates from the values in the table indicating the CO
2
percentage at maximum power, contact your local dealer.
6
Press and simultaneously to exit the test program.
7
Put the front panel back in its place.
9 Operation
9.1 Overview: Operation
The gas boiler is a modulating, high-efficiency boiler. This means
that the power is adjusted in line with the desired heat requirement.
The aluminium heat exchanger has 2 separate copper circuits. As a
result of the separately constructed circuits for space heating and
domestic hot water, the heating and the hot water supply can
operate independently of each other.
The gas boiler has an electronic boiler controller which does the
following when heating or hot water supply is required:
▪ starting the fan,
▪ opening the gas valve,
▪ igniting the burner,
▪ constantly monitoring and controlling the flame.
It is possible to use the boiler's domestic hot water circuit without
connecting and filling the central heating system.
9.2 Heating
Heating is controlled by the indoor unit. The boiler will start-up the
heating process when there is a request from the indoor unit.
9.3 Domestic hot water
Because supplying hot water has priority over heating, the boiler will
switch to domestic hot water mode whenever there is a hot water
demand. When a simultaneous heating demand occurs:
▪ during heat pump only operation, the heat pump will provide heat
and the boiler will be bypassed,
▪ during period boiler only operation, and with the boiler in domestic
hot water mode, space heating will NOT be provided,
▪ during heat pump and boiler operation, the heat pump will provide
heat and the boiler will be bypassed and switch to domestic hot
water mode.
Hot water supply has priority above heating. The 2 systems cannot
operate simultaneously.
9.4 Operation modes
The following codes on the service display indicate the following
operating modes.
Off
The gas boiler is out of operation but is supplied with electric power.
There will be no response on space heating and/or domestic hot
water demands. Frost protection is active. This means that the
exchanger is heated up if the water temperature in the gas boiler is
too low.
If frost protection is activated, will be displayed (heating the
exchanger). In this mode, the pressure (bar) in the space heating
installation can be read on the main display.
Waiting mode (blank service display)
The LED at the button is lit and possibly also one of the LEDs for
the domestic hot water comfort function. The gas boiler is waiting for
a space heating and/or domestic hot water demand.
Pump overrun of space heating
After each space heating operation, the pump continues to run. This
function is controlled by the heat pump.