Heating System Piping - RBI FUTERA II Series Installation And Operation Instructions Manual

FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS

HEATING SYSTEM PIPING

General Piping Requirements
All heating system piping must be installed by a qualifi ed
technician in accordance with the latest revision of the
ANSI/ASME Boiler and Pressure Vessel Code, Section IV,
and ANSI/ASME CSD-1, Standard for Controls and Safety
Devices for Automatically Fired Boilers. All applicable local
codes and ordinances must also be followed. A minimum
clearance of 1 in, 25 mm must be maintained between
heating system pipes and all combustible construction. All
heating system piping must be supported by suitable
hangers not the boiler. The thermal expansion of the
system must be considered when supporting the system.
A minimum system pressure of 12 psig, 82.7 kPa must
be maintained.
Heating Boiler Piping Connections
The supply and return connections should be sized to suit
the system, see Table 4.
Table 4 – Supply & Return Pipe Sizing
Model Size Supply Size
500 thru 1000 2" NPT
1250 thru 1950 2 1/2" NPT
Pump Requirements
This low mass boiler requires a continuous minimum water
fl ow for proper operation. The system pump must be sized
to overcome the head loss of the boiler and the heating
system in order to achieve the required temperature rise.
Table 5 provides the heat exchanger pressure drop and
temperature rise fi gures. The temperature rise across the
boiler must never exceed 35°F, 19.4°C. The adjustable
pump delay turns the pump on each time the burner fi res
and runs the pump for 6 to 600 seconds after the call for
heat is satisfi ed.
CAUTION: A temperature rise outside of the range
listed in Table 5 indicates that the fl ow rate through
the heat exchanger is incorrect which will damage
the heat exchanger voiding the warranty! The
maximum allowable temperature rise is 35°F, 19.4°C.
The maximum allowable fl ow rate through a Futera II
boiler is 97 GPM, 6.1 L/s on 500 through 1000 models
and 136 GPM, 8.6 L/s for 1250 through 1950 models.
The Cupro-Nickel heat exchanger allows for 108 GPM,
6.8 L/s on 500 through 1000 models and 151 GPM,
9.5 L/s on 1250 through 1950 models.
Table 5 - Temperature Rise Table
Model
Number
500
750
1000
1250
1500
Model
Number
500
750
1000
1250
1500
1750
1950
Model
Number
750
1000
1250
Return Size
1500
2" NPT 1750
1950
2 1/2" NPT
Model
Number
750
1000
1250
1500
1750
1950
16
ΔT = 20°F ΔT = 11.1°C
Flow Rate Pres. Drop Flow Rate
GPM Ft
42.5 0.53
63.8 1.57
85.0 3.44
106.3 2.11
127.5 3.57
ΔT = 25°F ΔT = 13.9°C
Flow Rate Pres. Drop Flow Rate
GPM Ft
34.0 0.35
51.0 1.04
68.0 2.27
85.0 1.40
102.0 2.36
119.0 3.67
132.6 5.14
ΔT = 30°F ΔT = 16.7°C
Flow Rate Pres. Drop Flow Rate
GPM Ft
42.5 0.70
56.7 1.60
70.8 1.00
85.0 1.70
99.2 2.60
110.5 3.70
ΔT = 35°F ΔT = 19.4°C
Flow Rate Pres. Drop Flow Rate
GPM Ft
36.4 0.60
48.6 1.20
60.7 0.70
72.9 1.30
85.0 2.00
94.7 2.80
Pres. Drop
L/s kPa
2.7 1.5
4.0 4.6
5.4 10.1
6.7 6.2
8.1 10.5
Pres. Drop
L/s kPa
2.1 1.0
3.2 3.1
4.3 6.7
5.4 4.1
6.4 7.0
7.5 10.8
8.4 15.1
Pres. Drop
L/s kPa
2.7 2.2
3.6 4.8
4.5 2.9
5.4 5.0
6.3 7.7
7.0 10.8
Pres. Drop
L/s kPa
2.3 1.6
3.1 3.6
3.8 2.2
4.6 3.7
5.4 5.8
6.0 8.1