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SERIES 28A BOILER INSTALLATION AND OPERATION INSTRUCTIONS

Figure 20 - Chilled Medium Diagram

NOTE

FOR HEATING: VALVES “H” OPEN, VALVES “C” CLOSED.

FOR COOLING: VALVES “H” CLOSED, VALVES “C” OPEN.

NOTE: Some locations do not allow this solution to be used. Check with the local authority having jurisdiction.

EXP. TANK

 

ROOM

 

 

UNIT

 

VENT

 

 

 

H

RELIEF

 

 

VALVE

 

 

 

PUMP

C

 

DRAIN

 

 

FILL

 

 

VALVE

 

 

H

C

 

DRAIN

 

 

BOILER

 

CHILLER

Cleaning of Water Boilers

Normally the cleaning of water boilers is unnecessary unless there is unusually heavy contamination of the boiler or system.

The burner must be installed and made operational along with the operating, limit and other safety controls. The burner on oil boilers must be adjusted to prevent sooting of the boiler flues.

Final burner adjustment should be made after the boiler has been properly cleaned.

WARNING: The pressure relief valve must be installed and piped to the floor to prevent scalding in the event of a discharge, see Figure

15.The discharge piping must be sized the same as the pressure relief valve outlet. Never install any type of valve between the boiler and the pressure relief valve! Failure to comply with this warning can result in an explosion causing extensive property damage, severe personal injury or death!

1.Install ball valves on the two 3" 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 off caustic soda and trisodium phosphate for every 50 ga, 189 L of water, see Table 7.

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 flush with large quantities of water.

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 fill 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" ball valves and drain the boiler and heating system.

9.Remove the 3" ball valve and install 3" pipe caps in the ends of the 3" NPT nipples.

10.Refill the boiler and heating system with water.

STEAM BOILER PIPING

Steam Boiler Pipeing Connections

Table 3 contains the steam riser location schedule. Riser, equalizer and header pipe sizes are located in Table 8. A typical single boiler piping arrangement is shown in Figure 21. Figures 22 & 23 contain typical piping diagrams for steam boilers in a battery.

NOTE: See CLEANING OF STEAM BOILERS before connecting the return piping.

CAUTION: Improper placement of steam risers will result in poor steam quality!

Table 8 - Steam Boiler Piping Sizes

 

 

Boiler

Number of

Header

Equalizer

Model 5" NPT Risers

Size, NPT

Size, NPT

4 & 5

1

5"

2

1/2"

6 & 7

2

5"

2

1/2"

8 Through 10

2

6"

 

4"

11 Through 18

3

8"

 

4"

The steam piping should be pitched so the condensate flows in the direction of steam travel. The return tappings should be yoked to equalize the return flow, Figure 16. Swing joints should be used.