70 | Inspection and maintenance
Greenstar FS
6 720 810 590 (2015/05)
▶ Fill the condensate trap with approximately 1 cup (1/4 litre) of water
and reinstall it.
15.1.8 Checking the mixer diaphragm
▶ Open the mixer unit.
▶ Carefully remove the diaphragm from the fan air intake and check for
contamination and cracks.
Fig. 93 Opening the mixer unit
▶ Insert the diaphragm into the fan connector. Ensure the diaphragm is
oriented properly.
▶Close the mixer unit.
15.1.9 Expansion vessel
Annual inspection of the expansion vessel is required.
▶ Depressurize the appliance.
▶ If necessary, adjust the expansion vessel pre-charge pressure to the
static head of the heating system ( page 32).
15.1.10 Setting the boiler water pressure
▶ If the indicator is below 14.5 psi (1 bar) when the system is cold, top
up the water. The indicator must be between 14.5 psi (1 bar) and
21.75 psi (1.5 bar).
▶ If the pressure is not held, check the expansion vessel and heating
system for leaks.
15.1.11 Testing system water quality
▶ Take a representative sample of the system water and analyze pH
using a pH meter or pH test strips.
▶ If the value is outside of the permitted range, drain the system, flush,
and refill with fresh water to prevent system damage or leaks.
▶ If the fill water does not meet the requirements of page 30, treat the
water to bring it within the permissible range.
▶ If antifreeze is being used in the system, check the frost protection
properties to ensure the site specific requirements are met.
15.1.12 Inspecting electrical wiring
▶ Check electrical wiring for mechanical damage and replace defective
cables.
The diaphragm flaps must open upwards.
DANGER: Risk of electric shock!
▶ Always disconnect the appliance from the mains
power before performing any work. Disconnect the
emergency shutoff switch or disengage the heating
system circuit breaker. Take measures to prevent
accidental re-connection.
Display on the pressure gauge
14.5 psi (1 bar) Minimum filling pressure (when system is cold)
14.5 psi to
21.75 psi
(1 bar to 1.5 bar)
Optimal filling pressure
30 psi (2.07 bar) Maximum pressure at maximum heating water
temperature must not be exceeded (safety valve
will spill).
Table 24 Operating pressure
1
2
3
6 720 641 933-94.1o
If using a hose to fill the heating system, prefill the hose
with water to prevent air being introduced into the
system.
pH-value Water preparation
7-8.5 Not needed
4.5-7 Required
Table 25 Water preparation for filling and maintaining the heating
system (pH-value)
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