Viessmann VITOCAL 300-A, Инструкции по установке и обслуживанию для подрядчиков

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5.
!
Please note
To prevent equipment dam-
age, check the flow and return
connections of the heat pump
secondary circuit for
leaks .
In the case of leaks, drain off
water via drain valve
B .
Check the seating of seal
rings.
Always replace dis-
lodged seal rings.
6. Close the on-site BDF valve.
7. To prevent damage to electrical com-
ponents, connect an on-site hose to
manual air vent valve
A . Open man-
ual air vent valve.
8. Close manual air vent valve A after
venting has been completed.
9. Check system pressure. Top up with
water if required.
Checking the expansion vessel and heating circuit pressure
Carry out this test on a cold system.
Note
Only use anti-corrosion agents that have
been approved for heat pumps with
DHW heating via single-walled heat
exchangers (DHW cylinders).
1. If an on-site shut-off valve is installed,
close it.
Otherwise drain the heating system
on the heating water side until the
pressure gauge indicates "0".
2. If the pre-charge pressure of the
expansion vessel is lower than the
static system pressure, top up with
sufficient nitrogen to raise the pre-
charge pressure of the expansion
vessel by 0.1 to 0.2 bar (10 to
20 kPa) higher than the static system
pressure.
Example:
Static head (distance between the
heat source and the highest heating
surface) 10 m
Equivalent to a static pressure of
1 bar (0.1 MPa).
3. Top up with water until the filling pres-
sure exceeds the pre-charge pres-
sure of the expansion vessel.
On a cold system, the charge pres-
sure must be approx. 0.2 bar
(20 kPa) higher than the static pres-
sure.
4. During commissioning, mark this
value on the pressure gauge as min-
imum charge pressure.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5516 436 GB