17
Finned copper tube gas boilers & water heaters – Boiler manual
FTXLF-IOM-HN-1-110308 Copyright 2008 Mestek, Inc.
Typical Primary/Secondary Piping System
Figure 10
(See Notes)
Low Temperature Piping with Thermostatic Valve
Figure 11
(See Notes and Adjustment Procedure)
NOTES:
For pump selection consult factory.
1.
Boiler pump sized to boiler and thermostatic 3-way valve design flow requirements.
2.
Boiler circuit piping must be sized large enough to handle maximum flow through unit.
3.
All boilers furnished with factory mounted outlet water temperature gauge.
4.
Boiler pump purging required. use terminals supplied.
5.
Valve is pre-calibrated for 140
6.
o
F return temperature.
NOTES:
Boiler circuit piping must be sized large
1.
enough to handle maximum flow through
unit.
Boiler pump sized to boiler design flow
2.
requirements.
All boilers furnished with factory mounted
3.
outlet water temperature gauge.
Boiler pump purging required. use termi-
4.
nals supplied.
All primary/secondary piping systems re-
5.
quire a remote operator.
These drawings show
suggested piping con-
figuration and valving.
Check with local codes
and ordinances for spe-
cific requirements.
ADJUstment proceDUre
(To maintain inlet temperature
above flue gas dewpoint)
T1 is the return water temperature.
1.
Minimum temp, T1 = 140
2.
o
F, 60
o
C.
Turn heater on and OPEN valves "A"
3.
and "B."
After steady-state operation is
4.
reached:
If T1 is less than 140
5.
o
F, 60
o
C:
SLOWLY CLOSE valve "B" until T1 rises
to the desired operating temperature
(but NO LESS than the minimum,
140
o
F, 60
o
C).
If T1 is greater than desired operating
6.
temperature, slowly close valve "A"
until the temperature drops to the
desired operating temperature (but
NO LESS than the minimum, 140
o
F,
60
o
C).
Check again after system operating
7.
temperature has stabilized. Then
make final adjustments.
