Install Instructions

Primary / Secondary Piping
Figure 4-6_Multiple Boilers Zoned with Circulators
BOILER 1
INDIRECT
DHW TANK
COLD
WATER
IN
AIR SEPARATOR
UNION
(TYPICAL)
PRESSURE
RELIEF VALVE
(PROVIDED)
MAKE UP
WATER
HOT
WATER
OUT
BOILER
CIRCULATOR
BACKFLOW
PREVENTER
PRESSURE
REDUCING VALVE
PRESSURE
GAUGE
ZONE #1
ZONE #2
TANK
AQUASTAT
RELIEF
VALVE
Y-STRAINER
(RECOMMENDED)
BOILER 2
IMG00273
ANTI-SCALD
MIXING VALVE
MAX 4 PIPE ø
OR 12" APART
ZONE CIRCULATORS
(TYPICAL)
MINIMUM 10 PIPE ø
DRAIN POINT
(TYPICAL)
RECIRCULATION
LOOP
(RECOMMENDED)
TEMPERATURE
& PRESSURE
GAUGE
(PROVIDED)
COLD
WATER
IN
EXPANSION
TANK
BALL VALVE
(TYPICAL)
FLOW
CHECK
VALVE
MAY SUBSTITUTE
LOW LOSS HEADER
SYSTEM
SENSOR
(OPTIONAL)
ZONE #3 ZONE #4
4 Water connections (continued)
31
Installation & Service Manual
Please note that systems using DHW priority MUST use mixing valves to protect low temperature zones.
NOTICE