Smith SERIES 28RTS/HE Installation & Operating Instructions Manual page 20

SERIES 28RTS/HE BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Page 20
1. Install ball valves on the two 3 in. NPT nipples in the
bottom of the front section and pipe to a suitable
drain.
2. Fill the boiler 3/4 full with water.
3. Make a cleaning solution by mixing 1 lb, 0.45 kg each
of caustic soda and trisodium phosphate for every 50
ga, 189 L of water, Table 9.
Table 7- Boiler Water Content
Boiler
Model
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
NOTE: The water content of the heating system must
be added to the boiler water content.
CAUTION: Avoid skin contact with cleaning solution
to prevent injury! If eye or skin contact occurs fl ush
with large quantities of water.
NOTE: Some locations do not allow this solution
to be used. Check with the local authority having
jurisdiction.
Water Boilers
Gallons Liters
123 466
150 568
177 670
204 772
231 875
258 977
285 1079
312 1181
339 1283
366 1386
392 1484
419 1586
446 1689
473 1791
500 1893
4. Mix the cleaning chemicals with water to create a
concentrated solution. Pour the cleaning solution
through one of the top tappings in the front section
and plug it.
5. Immediately fi ll the rest of the boiler and the heating
system with water.
6. Fire the boiler and maintain a water temperature of
160°F to 200°F, (71°C to 93°C) it may be necessary
to cycle the boiler.
7. Run all of the system pumps during the cleaning
procedure.
WARNING: Monitor the boiler pressure constantly
during the cleaning procedure. Do not allow the
boiler pressure to exceed the pressure listed on
the pressure relief valve or a discharge of hot
water and steam will occur!
8. Shut the boiler off and allow the boiler to cool to
100°F, 38°C. Open the 3 in. ball valves and drain the
boiler and heating system.
9. Remove the 3 in. ball valves and install 3 in. pipe
caps on the ends of the 3 in. NPT nipples.
10. Refi ll the boiler and heating system with water.