Laars mascot ft MFTHW Installation And Operation Instructions Manual page 46

Page 44
4.14 Plumbing Guidelines
Zoning with zone valve
- In a valve based system, there is one circulator pump at the boiler and each heating zone has a zone
valve which opens when the zone.
- Each thermostat is wired directly to the corresponding zone valve. Contacts in the zone valves provide a
proper signal to the boiler when the valve is opened.
Figure 11. Plumbing Diagram using zones and zone valves
Gate valve
Expansion tank
(Closed type)
Air separator
Circulation pump
Check valve
Isolation valve
Pressure relief valve
PRIMARY LOOP
(SPACE HEATING)
SECONDARY LOOP (SPACE HEATING)
CH SUPPLY
CH RETURN
Do not exceed 12" apart
LAARS Heating Systems