itho daalderop PX42 Gas Valve Installation Guide
- June 6, 2024
- itho daalderop
Table of Contents
itho daalderop PX42 Gas Valve
Itho Daalderop Gasvalve PX42 replacement
Safety & regulations
- Do not use the product for purposes other than those for which it is intended, as described in this manual.
- The product may not be modified.
- The installation, commissioning, inspection, maintenance, and repair of this product and/or system may only be carried out by a qualified installer (*) in accordance with the (safety) requirements set out in the manual. Only original accessories and parts prescribed by the manufacturer may be used.
The Netherlands:
A qualified installer is an installer employed by a central heating or mechanical installation company registered with the Chamber of Commerce and listed in the SEI accreditation register (Foundation for Accreditation of Installation Companies) or which has a Sterkin accreditation.
Belgium
A qualified installer is a technician employed by an HVAC or electrical
installation company registered with the Crossroads Bank for Enterprises with
a valid VAT number.
Replace gas valve
Warning!
Adjusting and/or converting an appliance requires specialist knowledge and
may, therefore, only be carried out:
Netherlands:
By the manufacturer of the appliance, and Itho Daalderop service technician,
or an accredited installer.
Belgium:
By the manufacturer of the appliance or an Itho Daalderop service technician.
Warning!
Re-adjusting and/or converting the appliance to a gas type other than the one
for which it was approved without using genuine Itho Daalderop parts is not
permitted.
To replace the gas valve, the following safety measures must first be taken:
- Switch off the supply voltage before carrying out any work.
- Prevent unintentional switching on of the supply voltage.
- Shut off the gas supply to the appliance.
- A small amount of gas will escape during replacement. Ensure adequate ventilation of the installation space.
Proceed as follows to replace the gas valve:
- a) Open the appliance.
- b) Disconnect the ignition transformer from the old gas valve.
- c) Remove the old gas valve, including the old gaskets.
- d) Fit the new gas valve.
- Always use the new gaskets!
- e) Place the ignition transformer back on the gas valve.
Bleed the gas line of the appliance and check the settings of the gas valve.
Bleeding the gas line
Warning!
- Naked flames are forbidden! No smoking!
- Avoid sparks!
- Do not use electrical equipment.
Caution!
Do not turn on the power to the appliance yet. Only do so when this is
expressly required during commissioning.
Bleeding
Proceed as follows to bleed the gas line of the appliance:
- a) Open the gas supply to the appliance.
- b) Loosen the screw of the measuring nipple on the gas valve.
- c) Wait until gas flows from the measuring nipple.
- d) Retighten the screw of the measuring nipple.
Check the settings of the gas valve.
Caution!
Prevent starting the appliance when switching on the power.
Make sure that the room thermostat does not request heating, and do not use
the hot water tap.
a) Restore power to the appliance.
b) Proceed as follows to check that the appliance is functioning properly:
- Check gas inlet pressure on page 3.
- Check the O2 percentage in flue gases on page 4.
Tip
If air is still present in the gas supply, the appliance may make repeated
unsuccessful attempts to ignite the flame.
A flame fault is indicated after five start attempts. If this happens, unlock
the appliance by pressing the RESET key.
If the appliance does not ignite after three resets, vent the gas supply
through the gauge nipple.
Check gas inlet pressure
- a) Loosen the screw of the measuring nipple on the gas valve.
- b) Fit the measuring hose on the measuring nipple.
- c) Measure the gas inlet pressure with the appliance running at high power [Menu – Service menu –Ionisation current – HIGH POWER].
- d) Is the gas inlet pressure incorrect? Check and repair the gas supply (pipe and gas meter).
- e) Remove the measuring hose.
- f) Retighten the screw of the measuring nipple.
Base Cube | Base Cube Duo |Comfort Classic
Gas type
| min. [mbar]| nom. [mbar]| max. [mbar]
---|---|---|---
G25 (L-gas)
G25.3 (K-gas)
| 20| 25| 35
G20 (H-gas)| 17| 20| 30
G31 (Propane)| 25| 37| 45
Cube One | Cube Duo | Combifort2
Gas type
| min. [mbar]| nom. [mbar]| max. [mbar]
---|---|---|---
G20 (H-gas)| 17| 20| 30
G25 (L-gas)| 20| 25| 35
G31 (Propane)| 25| 37| 45
| | |
Check O2 percentage in flue gases
The adjustment of the appliance must always be measured with O2 measuring equipment.
Note
If the appliance is not warm enough, it may take longer than three minutes to
measure a stable value.
Tip
The CH supply temperature may be higher than the setting in the service menu,
in which case the appliance will switch off.
If necessary, temporarily increase the CH temperature setting [Menu – Service
menu – Settings – CH TEMPERATURE] before taking the measurement. If the CH
supply temperature is still too high, unplug the flow sensor connector and
open the hot water tap. After the measurement, close the hot water tap
immediately and reconnect the flow sensor.
Tip
In case of large deviations, contact Itho Daalderop.
If you have a measuring device with an accuracy of < 0.25% O2, you can check the percentage of the flue gases.
-
a) Use the measuring point to measure the O2 value of the flue gases.
-
b) First measure the O2 percentage at high power until the value (*) remains stable [Menu – Service menu –Ionisation current – HIGH POWER].
-
c) Then measure the O2 percentage at low power until the value (*) remains stable [Menu – Service menu –Ionisation current – LOW POWER].
-
d) If the values are not compliant, the gas valve must be readjusted. Follow the instructions as described in Adjusting the gas valve on page 7.
Caution!
Adjusting the appliance via O2 always takes precedence (in relation to the load). When adjusting, always ensure a negative offset (less than -2 Pa). -
e) Note the measured value in the service table of this document.
-
f) After the measurement, replace the measuring nipple cap on the flue gas adapter.
The measured values must be within the limits stated in the tables.
Base Cube | Base Cube Duo
Comfort Classic
Cube One | Cube Duo
Combifort2
Adjusting the gas valve
Warning!
Adjusting and/or converting an appliance requires specialist knowledge and
may, therefore, only be carried out:
Netherlands:
By the manufacturer of the appliance, an Itho Daalderop service technician, or
an accredited installer.
Belgium:
By the manufacturer of the appliance or an Itho Daalderop service technician.
Caution!
Adjusting the appliance via O2 always takes precedence (in relation to the
load). When adjusting, always ensure a negative offset (less than -2 Pa).
Note
If the appliance is not warm enough, it may take longer than three minutes to
measure a stable value.
Tip
The CH supply temperature may be higher than the setting in the service menu,
in which case the appliance will switch off.
If necessary, temporarily increase the CH temperature setting [Menu – Service
menu – Settings – CH TEMPERATURE] before taking the measurement.
If the CH supply temperature is still too high, unplug the flow sensor
connector and open the hot water tap. After the measurement, close the hot
water tap immediately and reconnect the flow sensor.
Readjustment of the appliance is necessary only if the O2 values of the flue gases are not compliant.
A: Use the measuring point to measure the O2 value of the flue gases.
b) Operate the appliance at high power and use the throttle screw to adjust the gas valve.
The throttle screw has a ratchet mechanism with no play in either direction.
Each click equals approximately 0.2% O2 increase or decrease.
Anti-clockwise increases the O2 value, clockwise reduces the O2 value.
The offset screw is protected by a cap screw. This cap screw must be removed before the O2 value can be adjusted at low load. The throttle screw has no play in either direction. Anti-clockwise increases the O2 value, and clockwise reduces the O2 value.
RESET HIGH LOAD ADJUSTMENT (G20/G25 only)
If adjustment is unsuccessful, the throttle screw may have been turned too far out of its adjustment range. In this case, first turn the screw back to its starting position with the top of the screw approximately 4.5 mm below the plastic edge. After this, the O2 value can be set again at high load.
c) To check, operate the appliance at low power. If the O2 value is not compliant, use the offset screw to adjust the gas valve.
Tip
In case of large deviations, contact Itho Daalderop.
Netherlands
- Itho Daalderop
- Admiraal de Ruyterstraat 2 3115 HB Schiedam
- E [email protected] I www.ithodaalderop.nl
- Installers only:
- T +31 (0)10 427 85 65
Belgium
- Itho Daalderop Belgium bvba Brusselsesteenweg 498 1731 Zellik
- T +32 (0)2 207 96 30
- E [email protected]
- Service requests only:
- E [email protected]
- I www.ithodaalderop.be