34
Installation & Operation Manual
The installer must ensure that the boiler is supplied with
adequate flow without excessive temperature rise. It is
recommended that this boiler be installed with a bypass
in the piping if the maximum recommended flow rate is
exceeded. The bypass will help to ensure that the boiler can
be supplied with adequate water flow. Flow rates exceeding
the maximum recommended flow will result in erosion of the
boiler tubes. A typical bypass with a valve will allow control
of boiler flow.
Boiler bypass requirements
TABLE - 5B
SYSTEM TEMPERATURE RISE CHART
Temperature Rise and Head Loss Based on Boiler Output in Btu/hr
Btu/hr
20°F
T
25°F
T
30°F
T
35°F
T
40°F
T
45°F
T
50°F
T
55°F
T
60°F
T
Input
GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM Ft/hd
2,500,000 215.0
7.8
175.0
6.3
145.0
4.8
124.3
3.3
108.8
2.4
96.7
2.0
87.0
1.6
79.1
1.2
72.5
1.1
3,000,000 260.0* 14.0 210.0 11.9 174.0
9.8
149.1
6.9
130.5
4.6
116.0
3.6
104.4
2.9
94.9
2.2
87.0
1.9
3,500,000 N/A
N/A 245.0* 11.9 203.0
9.8
174.0
7.7
152.3
6.3
135.3
5.2
121.8
4.2
110.7
3.3
101.5
2.7
4,000,000 N/A
N/A 280.0* 18.0 232.0* 14.1 198.9 10.2 174.0
7.9
154.7
6.5
139.2
5.3
126.5
4.6
116.0
3.9
5,000,000 N/A
N/A
N/A
N/A 290.0* 20.2 248.6* 14.9 217.5 11.9 193.3
9.2
174.0
7.2
158.2
6.4
145.0
5.2
*Cupro-Nickel Heat Exchanger Required at Flows Above 225 GPM.
Temperature / pressure gauge
This boiler is equipped with a dial type temperature / pressure
gauge. This gauge is factory installed in the outlet side of
the boiler piping. The gauge has one scale to read system
pressure and a separate scale to read water temperature in
degrees Fahrenheit. The temperature / pressure gauge is
provided to meet code requirements. Water temperatures
can be more accurately monitored from the data provided in
the digital display in the Operator Interface.
Typical heating boiler installations
General plumbing rules:
1. Check
all
local
codes.
2. For serviceability of boiler, always install unions.
3. Always pipe pressure relief valve to an open drain.
4. Locate system air vents at highest point of system.
5. Expansion tank must be installed near the boiler and
on the suction side of the system pump.
6. Support all water piping.
Installation with a chilled water system
Pipe refrigeration systems in parallel. Install duct coil
downstream at cooling coil. Where the hot water heating boiler
is connected to a heating coil located in the air handling units
which may be exposed to refrigeration air circulation, the boiler
piping system must be equipped with flow control valves or
other automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
The coil must be vented at the high point and hot water from the
boiler must enter the coil at this point. Due to the fast heating
capacity of the boiler, it is not necessary to provide a ductstat to
delay circulator operation. Also, omit thermostat flow checks
as the boiler is cold when heating thermostat is satisfied. This
provides greater economy over maintaining standby heat.
5
Water connections
