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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 6
Insufficient Hot Water
(Tempering Valve Fitted)
Has there recently been a large
draw-off of hot water?
Typically the hot water inlet
temperature to the tempering valve
must be 10°C higher than the required
outlet temperature.
Confirm if a recent large draw-off has
reduced the hot water supply
temperature. Advise the customer to
allow time for the heater to recover.
Is the outlet water temperature
from the tempering valve
approximately 48ºC?
Tempering valves are generally set to
deliver water at 48
– 50ºC. Depending
on the insulation and length of pipe
work, water temperature can be lower
due to heat loss.
Normal Operation
YES
Are the tempering valve filters
blocked?
YES
Clean or replace the filters.
Replace the tempering valve
YES
NO
NO
NO
If concerns are around the water temperature
in the kitchen or laundry, recommend a two
zone plumbing option if possible.
6
Two Zone Plumbing Option
