CHAFFOTEAUX PIGMA Gal Evo, Руководство по обучению

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Page. 35 of 73
Training manual :PIGMA Gal Evo
4.7
BY-PASS VALVE
The boiler is equipped with an automartic by-pass valve allowing protection from the occurrence of a poor
flow rate from the system, which may be originated for instance from some closures of the thermostatic
cocks.
This DP is governed by a valve and a spring which open more or less for an extent depending on applied
load.
The by-pass valve ensures, in the main heat exchanger, a minimum flow rate of 50l/h. It is mounted
behind the main valve with 3 bar rating.
4.8 PRIMARY HEAT EXCHANGER
Primary heat exchanger is made from cupper metal. It is coated with an aluminum and silicone base paint
with high temperature resistant property.
The function of this exchanger consists in transfering heat from products of combustion to water flowing in
the heating circuit lines or in the sanitary heat exchanger.
The exchanger is rack-mounted in the upper part of the combustion chamber. It is held in positiin by two
screws secured to the side panels in the chamber.
4.9 PRESSURE PICK-UPS (FF ONLY)
Pressure pick-ups are to verify in real time the pressure
availabe in the primary circuit.
Contact closed
> 0,6 b
Contact open < 0,4 b