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Outdoor Knight XL Installation & Operation Manual
3 Hydronic piping
Figure 3-10 Multiple Boilers - Primary/Secondary Piping
Model
Number of Units
2345678
Manifold Pipe Sizes in Inches (mm)
400
2 1/2 (64) 3 (76) 3 1/2 (89) 4 (102) 4 (102) 5 (127) 6 (152)
501
3 (76) 3 1/2 (89) 4 (102) 5 (127) 5 (127) 6 (152) 6 (152)
601
3 1/2 (89) 4 (102) 5 (127) 5 (127) 6 (152) 6 (152) 8 (203)
701
3 1/2 (89) 5 (127) 5 (127) 6 (152) 6 (152) 8 (203) 8 (203)
801
4 (102) 5 (127) 5 (127) 6 (152) 8 (203) 8 (203) 8 (203)
EXPANSION
TANK
AIR SEPARATOR
PRESSURE REDUCING
VALVE
BACK FLOW
PREVENTER
BALL VALVE
(TYPICAL)
UNION (TYPICAL)
PRESSURE RELIEF
VALVE
FLOW CHECK
VALVE (TYPICAL)
INDIRECT DHW
TANK
BOILER 1
(LEADER)
TEMPERATURE /
PRESSURE GAUGE
PRESSURE GAUGE
DRAIN
DRAIN POINT
(TYPICAL)
BOILER CIRCULATOR
(TYPICAL)
ANTI-SCALD
MIXING VALVE
SYSTEM SUPPLY SENSOR
(WHEN USED)
SYSTEM CIRCULATOR
N
O
T
T
O
E
X
C
E
E
D
4
P
I
P
E
D
I
A
O
R
M
A
X
.
O
F
1
2
"
A
P
A
R
T
BOILER 2
(MEMBER 1)
BOILER 3
(MEMBER 2)
BOILER 4
(MEMBER 3)
DOMESTIC
HOT WATER
CIRCULATOR
COLD WATER IN
HOT WATER OUT
MAKE UP WATER
Y-STRAINER
(TYPICAL)
(RECOMMENDED)
MAY SUBSTITUTE
LOW LOSS HEADER
F
R
O
M
S
Y
S
T
E
M
TO
S
Y
S
T
E
M
IMG00417
NOTICE
System fl ow should always remain higher than the required fl ow for the boiler(s) when the boiler(s) is in
operation to prevent short cycling and high limit issues.
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
CAUTION
Indirect water heaters are capable of transferring a limited number of Btu’s into the water. Ensure boiler
output does not not exceed indirect water heater transfer capabilities.
Please note that these illustrations show an indoor tank to demonstrate piping concept only.
NOTICE