rada 320, Manual, Page: 22 / 32

22 1300905-W2-A
1. Only hot or cold water from outlet
a. Inlet supplies reversed (i.e. hot supply to cold inlet). Check.
b. No hot water reaching mixing valve. Check.
c. Check filters and inlet fittings for blockage.
d. Installation conditions continuously outside operating parameters. refer to
Specification.
2. Fluctuating or reduced flow rate
a. Check filters and inlet / outlet fittings for flow restriction (check isolators are fully open).
b. Ensure that minimum flow rate is sufficient for supply conditions.
c. Ensure that dynamic inlet pressures are nominally balanced.
d. Ensure that inlet temperature differentials are sufficient.
e. Check thermostatic performance; renew cartridge assembly if necessary.
3. No flow from mixing valve outlet
a. Check inlet isolators are fully open.
b. Check filters and inlet / outlet fittings for blockage.
c. Hot or cold supply failure.
4. Blend temperature drift
a. Refer to sympton 2 above.
b. Hot supply temperature fluctuation (rectify and refer to
Commissioning
).
c. Supply pressure fluctuation (refer to Installation )
5. Hot water in cold supply or vice versa
Indicates check valve require maintenance, refer to Maintenance .
Note! Some 320 variants are not supplied with checkvalves. Therefore, in-line checkvalves
may require maintenance. These may be away from the product.
6. Maximum blend temperature setting too hot or too cool
a. Indicates incorrect temperature setting. Refer to Commissioning .
b. As sympton 4 above.
c. As sympton 5 above.
7. Water leaking from valve body
Seals worn or damaged.
a. Obtain Seal Pack and renew all seals.
b. If leak persists from around the temperature spindle, replace the cartridge assembly.
Troubleshooting