Installation & Operation Manual
35
6
Hydronic piping
(continued)
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
PRESSURE
GAUGE
SYSTEM SUPPLY
SENSOR
NOT TO EXCEED 4 PIPE DIA. OR A MAX. OF 12” APART
DRAIN POINT
(TYPICAL)
SYSTEM
CIRCULATOR
ANTI-SCALD
MIXING VALVE
DOMESTIC
HOT WATER
CIRCULATOR
PRESSURE
RELIEF VALVE
UNION
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
BOILER
CIRCULATOR
DRAIN
BOILER
(LEADER)
INDIRECT
DHW TANK
BALL VALVE
(TYPICAL)
EXPANSION
TANK
HOT
WATER
OUT
ZONE #1
ZONE #2
ZONE #3
ZONE #4
AIR SEPARATOR
COLD
WATER
IN
ZONE VALVES
(TYPICAL)
DIFFERENTIAL
PRESSURE BYPASS
VALVE (IF USED)
MAKE UP WATER
BOILER 2
(MEMBER 1)
Figure 6-7
Multiple Boilers Zoned with Valves
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes
80
1-1/4" 1-1/2"
2"
2-1/2" 2-1/2" 2-1/2" 2-1/2"
105
1-1/2"
2"
2"
2-1/2" 2-1/2" 2-1/2"
3"
150
2"
2"
2-1/2" 2-1/2" 2-1/2"
3"
3-1/2"
210
2"
2-1/2"
3"
3"
3-1/2"
4"
4"
285
2-1/2" 2-1/2"
3"
3-1/2" 3-1/2"
4"
5"
