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- In a zone valve based system, there is one circulator pump and each heating zone has a zone valve which
opens when the zone demands heat.
- Each thermostat is wired directly to the corresponding zone valve. Contacts in the zone valves provide a call
for heat to the zone relay panel when the valve is opened.
Note: The signal back to the T/T terminals on the FT Floor boiler must be a dry contact. Do NOT send a 24 V
signal to the FT Floor boiler.
Refer to section 4.16.4 for detailed DHW piping for the FT Floor Combi boiler.
1) This piping diagram is meant to show system
piping concept only. Installer is responsible for all
equipment and detailing required by local codes.
2) The system return must be piped directly to the
Boiler Return connection.
3) The system supply must be piped directly to the
Boiler Supply connection.
4) The minimum pipe size of DHW piping should be
3/4” diameter.
5) Install a minimum of 12 diameters of straight pipe
upstream of all circulators.
6) Manufacturer requires the use of an anti-scald
mixing valve at domestic hot water outlet (boiler
location) to reduce potential for scalding. An
approved anti-scald valve is included in the
accessory box. Check with local codes.
Plumbing Guidelines (continued)
4.16.5 Zoning with zone valves
MAKE UP
WATER
ZONE 1
ZONE 3
Expansion
Tank
Back-flow
Preventer
Purge
Valve
Air
Eliminator
Isolation
Valve
Pressure
Reducing
Valve
SUPPLY
RETURN
Circulator
Check
Valve
Air Vent
Pressure
Relief
Valve
Zone
Valve
HI TEMP ZONE
SYSTEM 2, HEATING WITH ZONE VALVES & AUXILLIARY HI TEMP ZONE
ZONE 2
Circulation pump
Check valve
Zone valve
Pressure
reducing valve
Drain valve
Gate valve
Backflow preventer
Pressure Relief Valve
Expansion tank
Air separator
(Diaphragm-type)
Automatic air vent
Anti-scald rated
Mixing Valve
Check Valve
Shut-off valve
Circulation pump
with built-in IFC
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