Lochinvar 80 - 285 - Manual (Page 37)

Installation & Operation Manual
37
6
Hydronic piping
(continued)
INDIRECT
DHW TANK
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE PRESSURE
GAUGE
ANTI-SCALD
MIXING VALVE
AIR SEPARATOR
EXPANSION
TANK
ZONE #1
ZONE #2 ZONE #3 ZONE #4
BALL VALVE
(TYPICAL)
DRAIN POINT
(TYPICAL)
MAKE UP WATER
ZONE CIRCULATORS
(TYPICAL)
FLOW CHECK
VALVE
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA. OR MAX. OF 12" APART
BOILER
CIRCULATOR
BOILER 2
(MEMBER 1)
DOMESTIC
HOT WATER
CIRCULATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
HOT
WATER
OUT
COLD
WATER
IN
BOILER 1
(LEADER)
SYSTEM SUPPLY
SENSOR
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
MAY SUBSTITUTE LOW LOSS HEADER
DIRT SEPARATOR
(RECOMMENDED)
(TYPICAL)
Figure 6-5 Multiple Boilers Zoned with Circulators
Model
Number of Units
2 3 4 5 6 7 8
Required Pipe Sizes
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" 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"