Rinnai HD55 Series User manual

Water Heater
Service Manual
REU-VR2632 (HD50i)
REU-VRM3237 (HD70E)
REU-VCM2837 (HD55 Series)
REU-KM2635 (HDC1200 Series)
REU-KM3237 (HDC1500 Series)

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STOP
Do not attempt to Service this appliance if you are not
qualified. This can void the warranty.
This manual must be read in its entirety before Servicing
the appliance.
If you are unsure of any point contact Rinnai UK
SERVICE INSTRUCTIONS

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Service Information Page 4
Service Procedure Page 5-7
HD50i & HD70E Gas Pressure Setting Page 8-9
HD50i & HD70E Dip Switch Setting Page 10
HD55 Series Gas Pressure Setting Page 11-12
HD55 Series Dip Switch Setting Page 13
HDC1200 and HDC1500 Series Gas Pressure Setting Page 14-15
HDC1200 and HDC1500 Series Dip Switch Setting Page 16
HD50i & HD70E Temperature Setting Page 17
HD55, HDC1200 & HDC1500 Temperature Setting Page 18
Contact Information Page 20
CONTENTS

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 All Rinnai products should be Serviced at least once a year.
 The correct service kit should be acquired before commencing the service.
 The service kit will include all gaskets you may need.
 If you do not use the correct service kit and any gaskets or seals are broken in the
course of inspection the appliance in question has to be shut down until the
damaged gasket or seal is replaced.
 If the appliance continues to operate with damaged gaskets or seals this could
affect the performance or correct safe operation of the appliance.
 Servicing is required to maintain the appliances warranty.
 If there are any questions with regards any part of the service please contact the
Technical Department at Rinnai UK.
Service Kit Contents
The service kit contains the following items
 Electrode Kit
 Electrode Sleeve
 Water Inlet Filter
 Combustion Chamber Plate Gasket
 Manifold Seal Upper
 Manifold Seal Lower
 Gas Valve O-seal
The Part Numbers Required for the appliances associated with this service manual are
as follows
P50iVR-SERVICE— HD50i and 26i for V and VR series
P70EVR-SERVICE— HD70E and 32E for VM and VRM series
P55EVCX-SERVICE—HD55 Series
P1200iKM-SERVICE— HDC1200 Series and K26i
P1500iKM-SERVICE— HDC1500 Series
SERVICE

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Service Procedure
With the Rinnai Appliances listed on the front page they may look different but the service
procedure is pretty much identical for each one as well as the removal of each part. The
Rinnai service consists of inspection, clean and or replace of parts associated with the
combustion cycle. This procedure consist of the following
 Remove the manifold and inspect injectors. If debris is found in the injectors then these
must be cleaned from inside to out. This can be done by removing the face plate.
NOTE: Below is an image of a HDC1500 manifold. The removal of all the other manifolds is a
similar process. The outside edge screws and the screws on the gas valve are to be removed
 Remove Combustion Chamber plate to clean and inspect electrodes. This plate is
the one with the site glass on it. The service kit does include a full electrode kit so it
is advised that this is change at least every 2 years if it is deemed suitable for use
once cleaned.
NOTE: Only remove the Electrode cover plate if you have a replacement gasket. If the gasket
deteriorates and there isn't a replacement the water heater has to be isolated until one is
installed
SERVICE

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 Unplug, remove and inspect Fan Motor taking care not to damage the impellor. Clean
with a soft brush if required
NOTE: When removing the fan motor if the motor is face on then it will be 3 or 4 screws that hold it on to the
scroll box. If the fan motor is side on then you will have to remove the scroll box first before removing the motor,
this is usually two screws.
 Removing two screws will allow the burner box to be removed. Inspect and clean if
necessary turning upside down to ensure any debris can fall clear.
SERVICE

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 Inspect combustion chamber ensuring that all air holes are clear of blockages.
 Inspect heat exchanger fins and clean with compressed air or a soft brush if required.
Once complete vacuum out or wipe all debris from inside combustion chamber.
 Before re-assembling check all seals and gaskets and if required replace with correct
ones from the service kit.
NOTE: The manifold seals are to be replaced at least every two years.
 Once all parts have been refitted correctly fire up the appliance and check there are no
leaks using an appropriate leak detector spray.
 Using the pages listed below for the relevant model check the dipswitches are correct
and carry out your gas pressure checks using the set procedure.

 Once the gas pressure checks have been carried out isolate the water in and out of the
appliance and check the water inlet filter. If required replace filter with one from the
service kit.
The service on the Rinnai Water Heater is now complete however please carry out full
checks of the system and flue system to ensure both of these are functioning correctly. If
there is a fault on either of these two systems this could affect the correct operation of the
appliance.
SERVICE

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GAS PRESSURE SETTING
HD50i and HD70E

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GAS PRESSURE SETTING
HD50i and HD70E

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DIP SWITCH SETTING
HD50i and HD70E