Page 44
4.14 Plumbing Guidelines (continued)
Circulation pump
Check valve
Drain valve
Gate valve
Backflow preventer
Pressure Relief Valve
Expansion tank
Air separator
(Diaphragm-type)
Automatic air vent
Anti-scald rated
Mixing Valve
PRIMARY LOOP
CH
SUPPLY
CH RETURN
(SPACE HEATING)
ZONE 1
ZONE 2
ZONE 3
1" or 1-1/4"
min piping
depending
upon boiler
size.
Do not
exceed
12"
See
Note
SECONDARY LOOP
(SPACE HEATING)
Make-Up Water
Circulation pump
Check valve
Drain valve
Gate valve
Backflow preventer
Pressure Relief Valve
Expansion tank
Air separator
(Diaphragm-type)
Automatic air vent
Anti-scald rated
Mixing Valve
PRIMARY LOOP
CH
SUPPLY
CH RETURN
(SPACE HEATING)
ZONE 1
ZONE 2
ZONE 3
1" or 1-1/4"
min piping
depending
upon boiler
size.
Do not
exceed
12"
See
Note
SECONDARY LOOP
(SPACE HEATING)
Make-Up Water
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. All closely spaced tees shall be 12” (or 4 pipe diameters) center to center spacing.
3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all
closely spaced tees.
4. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
5. Manufacturer strongly recommends the use of an anti-scald mixing valve at domestic hot water outlet
(boiler location) to reduce potential for scalding. Contact Manufacturer for recommended models.
Check with local codes.
4.14.5 Zoning with
circulation pumps
- Each heating zone of a pump
based system has its own
circulator pump which runs
when that zone demands it.
- Each zone thermostat goes to
a controller which controls the
pumps.
PRIMARY LOOP
CH
SUPPLY
CH RETURN
(SPACE HEATING)
ZONE 1
ZONE 2
ZONE 3
1”
Min
Piping
Do not
exceed
12"
See
Note
SECONDARY LOOP
(SPACE HEATING)
Make-Up Water
PRIMARY LOOP
CH
SUPPLY
CH RETURN
(SPACE HEATING)
ZONE 1
ZONE 2
ZONE 3
1”
Min
Piping
Do not
exceed
12"
See
Note
SECONDARY LOOP
(SPACE HEATING)
Make-Up Water
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