Installation & Operation Manual
34
6
Hydronic piping
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
TEMPERATURE /
PRESSURE
GAUGE
AIR SEPARATOR
EXPANSION
TANK
ZONE #1
ZONE #2
ZONE #3 ZONE #4
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE VALVES
(TYPICAL)
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
DIFFERENTIAL
PRESSURE BYPASS
VALVE (IF USED)
SYSTEM SUPPLY
SENSOR
SYSTEM
CIRCULATOR
DRAIN
NOT TO EXCEED 4 PIPE DIA. OR A MAX. OF 12” APART
Figure 6-6
Multiple Boilers Zoned with Valves
Model
Number of Units
2
3
4
5
6
7
8
Required Pipe Sizes
50
1"
1-1/4" 1-1/2"
2"
2"
2"
2"
80
1-1/4" 1-1/2"
2"
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"
3"
3-1/2" 3-1/2"
210
2"
2-1/2"
3"
3-1/2" 3-1/2"
4"
4"
