Rinnai
8
EHPA Heat Pump OIM
HYDROGEN GAS
If the hot water unit is not used for two weeks or more, a quantity of hydrogen gas, which is highly flammable,
may accumulate in the water heater. To dissipate this safely, it is recommended that a non electrically operated
hot tap be turned on for two minutes at a sink, basin, or bath, but not a dishwasher or other appliance. During
this procedure there must be no smoking, open flame or any electrical appliance operating nearby. If hydrogen is
discharged through the tap, it will probably make a sound like air escaping.
TURNING OFF THE WATER HEATING SYSTEM
If you plan to be away for only a few nights, we suggest you leave the water heating system switched on. If it is
necessary to switch off the water heater, do so as outlined below:
WARNING
DO NOT turn power off to the heat pump unit if snow or frost conditions are expected as
componentsinthesystemmaybedamagedbyfreezing.Ifpowerneedstobeturnedofforpower
failure occurs and freezing conditions are expected, the water needs to be drained from the heat
pump unit. Follow the procedure described below in the section the section ‘Draining and Filling’
on page 8.
TURNING ON THE WATER HEATING SYSTEM
Switch on the electric supply to the heat pump unit. Water heating will now occur as required. It may take a number
of hours before hot water is available.
DRAINING AND FILLING
Draining or filling of the complete system normally only occurs during installation or servicing and must be carried
out by an authorised person.
Draining water from the heat pump unit is necessary if the power will be shut off to the unit and snow or frost
conditions are expected.
Arrange for an authorised person to carry out this task.
To drain the heat pump:
1. Turn off power to the heat pump
2. Close the cold water mains supply stop cock
3. Open a hot tap to relieve pressure
4. Disconnect the hot outlet near the top of the storage cylinder
5. Disconnect the cold inlet near the bottom of the storage cylinder.
6.
The system will now drain completely.
MAINTENANCE AND REGULAR CARE
Operate the easing gear of the PTR and the ECV if fitted as described in the section ‘Safety Devices’ on page
7the section ‘Safety Devices’ on page 7.
The overflow tray (supplied by installer) and drain underneath the storage cylinder (if fitted) should be periodically
checked to ensure there are no blockages.
WARNINGS AND IMPORTANT INFORMATION
