LAARS Heating Systems
Page 44
PRIMARY LOOP
CH SUPPLY
(SPACE HEATING)
ZONE 1
ZONE 2
ZONE 3
FLOOR HEATING
SECONDARY LOOP (SPACE HEATING)
Do not exceed 12" apart
CH RETURN
Circulation pump
Pressure relief valve
Expansion tank
Air separator
(Closed type)
Isolation valve
Check valve
Gate valve
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
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