Burnham K50 manual Water Trim and Controls

g.If boiler has been ordered with 3/8” try-valve tapping, install try-cock.

h.Install “Lowest Permissible Water Level Plate” and “Frequent Water Addition – Caution Label” on upper left end jacket panel.

i.Proceed directly to Paragraph 36.

Fig. 26

Water TRIM AND CONTROLS

34.INSTALL WATER TRIM AND CONTROLS, see

Fig. 7 and 26.

a.Temperature 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 PRESSURE ON GAUGE GLASS.

b.Install Temperature Limit Controls as follows:

Bush 1-1/2” tapping in upper corner of End Section to ¾” and install Temperature Limit Control furnished following instructions supplied with control. On boilers without Built-in Tankless Heater, install second temperature limit control (not furnished) in Tapped Heater Opening Cover Plate. On boilers with Built-in Tankless Heater, install operating control in ¾” tapping in Heater Plate-plug tapping in Second Heater when supplied.

c.On boilers equipped for forced circulation hot water heating without domestic hot water, a reverse acting circulator control may be needed to prevent condensation of flue gases during periods of low boiler water temperature. This control can be installed in the Tapped Heater Opening Cover Plate.

d.TANKLESS HEATER PERFORMANCE

Tankless heater ratings in Series 5B boilers are based on continuous draw, temperature rise of 100ºF

30

(40-140ºF) and boiler water temperature of 200ºF. Some of the items affecting the coil performance are as follows:

(1)FLOW REGULATION – If flow through the heater is greater than its rating, the supply of adequate hot water may not be able to keep up with the demand. For this reason a FLOW REGULATOR matching the heater rating should be installed in the cold water line to the heater.

(2)FLUSHING OF HEATER - All water contains some sediment which settles on the inside of the coil. Consequently, the heater should be periodically back-washed. This is accomplished by installing hose bibs as illustrated and allowing water at city pressure to run into hose bib A, through the heater, and out hose bib B until the discharge is clear. The tees in which the hose bibs are located should be the same size as heater connections to minimize pressure drop.

(3)HARD WATER – This is applicable to some city water and particularly to well water. This should not be a deterrent but precautions are necessary. A water analysis is necessary and an appropriate water softener installed. This is not only beneficial to the heater but to piping and fixtures plus the many other benefits derived from soft water.

NOTE: A hot water boiler installed above radiation level must be provided with a low water cut-off device as part of the installation.

WARNING

Install automatic mixing valve at tankless heater outlet to avoid risk of burns or scalding due to excessively hot water at fixtures. Adjust and maintain the mixing valve in accordance with the manufacturers instructions.

e.Following recommendations supplied with control, install #64 Low Water Cut-Off in 1” pipe tapping

“H” (Fig. 7) and System Return Piping. Control must be mounted so that cut off point is above marking on Lowest Permissible Water Line Plate.

f.Install Pressure Safety Relief Valve, using fittings furnished, into 1-1/2” pipe tapping in upper corner of End Section. DO NOT INSTALL A SHUTOFF VALVE BETWEEN SAFETY RELIEF VALVE AND BOILER. Safety Relief Valve must be installed in a Vertical Position with handle up.

g.Install Boiler Drain Valve into one of unused return tappings that has been bushed to ¾”. Drain Valve can also be installed in return piping, preferably in leg of tee that is located in line with return connection on Boiler.

35.CONNECT PIPING TO BUILT-IN HEATER(S) IF USED, see Fig. 27.