Burnham K50 manual Shutoff Valve Between Safety Valve, Steam Trim and Controls

32.Tighten all sheet metal screws.

a.Install the following plates or labels which are found in the Instruction Envelope. See Fig. 23 or 24 for location.

(1)Rating Label

(2)Operating Instruction Plate (#8 SMS required to fasten)

(3)Combustible Clearance Flooring & Adequate Combustion Plate

(4)Minimum Service Clearance Label

(5)Burnham Logo – Apply to Top Panel

(6)Boiler Ventilation/For Your Safety Label

b.Proceed to Paragraph 33 (Steam Boilers) or Paragraph 34 (Water Boilers).

NOTE: IF WATER BOILER, PROCEED DIRECTLY TO Paragraph 34.

33.INSTALL STEAM TRIM AND CONTROLS, See Fig. 7 and 25.

a.Pressure Gauge is to be installed with ½” nipple and

½” x ¼” reducing coupling in ½” tapping provided in upper corner of End Section using wrench applied to square shank on back of gauge. DO NOT APPLY FORCE ON GAUGE CASE.

b.Install 67BC-2 Low Water Cut-Off or 47-2

Combination Feeder and Low Water Cut-Off in accordance with the Instructions packed with the control. ½” pipe extensions are provided and must be installed in the ½” tappings adjacent to the Pressure Gauge before the control can be mounted.

Unions are furnished with the 67BC-2 Low Water

Cut-Off for ease of installation. 1” pipe tappings have been provided in the End Sections for other types of Low Water Cut-Offs and Low Water Cut- Off & Feeder combinations. Fig. 25A illustrates the required mounting elevations for a M&M 150 and a 67M float LWCO. Figure 13C illustrates a

typical steam piping arrangement for pumped return systems.

c.	Install Gauge Glass Fittings into ends of tees used
	to connect the 67BC-2 or 47-2 Control. If other
	control is furnished, install Gauge Glass Fitting
	directly into ½” pipe extensions.
d. Install Pressure Limit Controls as follows:
	(1)	Boiler equipped with 67BC-2 Low Water Cut-
		Off – Connect Pressure Limit furnished to ¼”
		street ell and ¼” pigtail siphon. For installation
		of second pressure limit (not furnished), bush
		1½” pipe tapping in upper corner of End
		Section. Connect Pressure Limit to this bushing
		with ¼” pigtail siphon.
	(2)	Boiler equipped with Low Water Cut-Off other
		than (1) above or with Low Water Cut-Off
		Feeder Combination – Bush 1½” pipe tapping
		in upper corner of End Section and connect
		Pressure Limit furnished to this bushing with
		¼” pigtail siphon. For installation of second
		pressure limit bush any available tapping on
		opposite end section that is above normal water
		line. Connect Pressure Limit to this bushing
		with ¼” pigtail siphon.
	(3)	Tighten limit controls by using wrench on hex
		fitting at bottom of control.
	(4)	The L404 Pressuretrol must be accurately
		leveled for proper operation. It is level when the
		leveling indicator hangs freely with its pointer
		directly over the index mark inside the back
		of the case. Level the controller by carefully
		bending the steam trap (siphon loop).
e.	Install Pressure Safety Valve with fittings furnished,
	into 1½” pipe tapping in upper corner of End
	Section, see Fig. 12. DO NOT INSTALL A
	SHUTOFF VALVE BETWEEN SAFETY VALVE
	AND BOILER. If this boiler tapping is to be used
	as Surface Blowoff, replace ell with tee and plug
	open end of tee or valve off opening. Pressure
	Safety Valve must be in leg of tee and in a vertical
	position with handle up.
f.	Install Boiler Drain Valve and 3” x ¾” Bushing into
	one of the two return tappings. The drain valve
	may also be installed in return piping, but it must
	be installed in the leg of a tee so that it is directly
	opposite and as close as possible to the return
	tapping. The leg of the tee must be at least 1½” pipe
	size.
	A Bottom Blowoff using a valve must also be
	connected to one of the return tappings. The ¾”
	Drain Valve may be used for Bottom Blowoff for
	5009B or smaller boilers, since any Bottom Blowoff
	piping or valves for 5009B or smaller boilers must
	be at least ¾”. Bottom Blowoff piping and valves
	for Boilers 5010B through 5021B must be at least

28

Fig. 25

STEAM TRIM AND CONTROLS

1”. Bottom Blowoff piping and valves for 5022B

Boilers and larger must be at least 1¼”.