Ferro GPA II Installation And Operation Manual page 58

EN
Bypass valve
Function: When all valves in the floor heating return pipeline or radiator temperature
control valves are closed, it's heat from the boiler can
be distributed.
Parts of the system:
• bypass valve
• flow meter at L.
With all valves closed, the flow must be kept at minimum. The pump setting depends
on type of bypass valve installed (manual valve or temperature control valve).
8.2. Manual Valve
Steps:
1. To adjust the bypass valve, the pump should be set at Min. System flow must be
kept minimum - refer to bypassvalve instruction.
2. After adjusting the bypass valve, set the pump by referring to Chapter 10 (Pump
settings and Performance).
8.3. Automatic Bypass-valve (Temperature Control)
Steps:
1. During bypass valve adjustment, the pump is set at Min and the system works on
minimum flow. Refer to bypass-valve instructions.
2. During bypass valve adjustment, the pump is set at minimum or works in max-
imum constant pressure mode. Relationship of settings to performance curve:
refer to Chapter 10 (Pump Settings and Performance)
9. START
9.1. Preparation
Before starting the pump, make sure that the system is filled with liquid air has been
drained and inlet pressure is set at minimum - please refer to Section 3.
9.2. Air draining
GPA-II series motor pump is fitted with an exhaust function. Air draining is not nec-
essary before startup. The presence of air in the pump may generate noise that will
disappear after several minutes from startup.
GPA-II series motor pump can be set in Max Speed for a short time, to drain off air
rapidly, according to system mode and design. When air has been drained and the
noise has disappeared, set the pump according to the applicable instructions.
Don't run the pump
Caution
without medium.