Rinnai 33
HW Demand Duo Systems OIM
THERMOSTATIC CONTROLLER OPERATION
The thermostatic controller is factory preset and designed to control the operation of primary pumps between
storage tank and external heat source, such as HD28, HD250 and HD210.
It has many functions and temperature sets points available which are described in the manual provided with the
controller.
DEMAND DUO PREVENTATIVE MAINTENANCE
All Items
•
Inspect for damage, corrosion or water leaks.
Tank
•
Ensure that tank is not leaking.
•
Ensure that PTR valves are not leaking. It is normal for PTR valve to operate during the heating cycle,
relieving pressure as the water is expanding. The PTR Valve is rated to 850 kPa and cold inlet pressure
should not exceed 500-700 kPa. If it does, then a pressure reduction valve should be fitted to the cold water
inlet.
•
Valve may be operating if water temperature in tank is close to 99°C. If this is the case thermostatic controller
or other heating equipment has failed to operate correctly. Contact Rinnai service department.
•
If pressure and temperature are low but valve is leaking, pull the lever for up to 30 seconds, as some foreign
material may be jammed in the valve seat. If valve fails to seat correctly, valve should be replaced. PTR
Valves are a non-repairable safety device and should be replaced with the correct model and pressure rating.
Primary Pump
•
Primary pumps are plugged into the relevant position on the thermostatic controller. Refer to manual provided
with the controller.
•
Some projects may have larger and/or dual pumps for redundancy or long primary pipe run situations.
•
Pump(s) operate only when activated by the thermostatic controller and the pump operation is indicated on
the controller screen.
•
Ensure that pumps are installed in a weather proof location or protected from being subjected to water
ingress. Wet pump electrics may cause failure. Water can run along power lead so keep the lead looping
under the pump and curving upwards toward the electrical box.
•
Ensure shaft is horizontal.
DO NOT
aim shaft upwards or downwards.
•
DO NOT
locate terminal box under pump housing. Position it on top preferable or on side
•
Bleed pump with chrome screw at end of pump casing
. This will be facing towards you when the pump
shaft is horizontal. Pump runs on water bearing and is critical for life of pump. Excessive noise indicates
damage or lack of bleed.
•
When this screw is removed the spinning / stationary impeller shaft can be inspected.
•
Ensure pump direction of flow arrow is towards the heat source.
•
If shaft is spinning but there is no flow: Check ball valves and any non return valve for correct installation and
operation. UPS25-80N and UPS32-100N pumps have inbuilt ball valves in the unions. Line up screwdriver
slot parallel to pipe to position them open.
26
27
Min. / Max.
-25 °C / +95 °C
UP(S) K
UP(S) KU
INSTALLATION HANDOVER MANUAL
