MAINTENANCE MANUAL
Mirage technical manual
page 29 of 65
Check tubing from mix-block to fitting for scale build-up
In the mix-block (see Figure M 10) cold water is mixed with hot water before being directed towards
the tea spout
which is “open to the environment” at the front of the machine. After dispensing hot
water, the tubing from the mix-block to the tea spout remains filled with water which cools down until
hot water is dispensed again. The increase in temperature of the cold water and decrease in pressure
in this tubing promotes carbonate deposition and as this tube has a 4 mm inner diameter, it is easily
affected by scale build-up.
Checking for scale build-up in the tubing can be done while the machine remains otherwise
operational. When the tubing is affected by scale build-up it has to be de-scaled (take it out of the
machine during de-scaling) or replaced.
Materials needed
Allen key 3 mm
Spanner 14 mm, 16 mm
Food-safe grease
de-scaling agent or new tubing when necessary
Procedure
1. Remove cup warmer.
2. Loosen 16 mm nut on tubing while retaining the fitting on the mix-block with a 14 mm spanner.
3. Loosen 16 mm nut from hot water fitting (see Figure M 10).
4. Remove tubing from machine.
5. Check tubing for scale build-up.
6. When necessary, replace tubing.
7. When installing a new tubing:
a. put a little silicone grease on the nut-side of the half ball welded on both sides of the
tubing.
b. Mount the tubing on the hot water fitting, do not tighten the nut completely yet.
c. Bend the tubing such that it fits closely to the fitting on the mix-block.
8. Mount tubing on the fitting on the mix-block, do not over-tighten.
9. Tighten nut on hot water fitting.
10. Dispense hot water and check for leakage, if necessary, tighten nuts a little more.
11. Replace cup warmer.
