Install Instructions

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies221, Make-Up Water Feeder

• Before using this product read and understand instructions.

• Save these instructions for future reference.

• All work must be performed by qualified personnel trained in the proper application, instal-

lation, and maintenance of plumbing, steam, and electrical equipment and/or systems in

accordance with all applicable codes and ordinances.

• Drain water level down below feeder and let cool to 80° (27°C) before servicing.

• If tank or receiver is pressurized relieve pressure to 0 psi (0 Bar) before servicing.

• To prevent water damage check to make sure there is adequate floor drainage capacity.

Check all components in the system to insure they will not leak in the event of an

overfeed condition.

Failure to follow this warning could cause property damage, personal injury or death.

Model 21

Model 221

SA21-6

Maximum water supply pressure: 150 PSIG (10.55 kg/cm

)

Maximum vessel pressure: 35 PSIG (2.46 kg/cm

)

Maximum fluid temperature: 120°F (49°C)

Model 21 and 221

Mechanical Water Feeders

And Replacement Valve Assembly SA21-6

Applications:

For receiver tanks in industrial or

commercial applications.

WARNING

McDonnell & Miller

Installation & Maintenance

Instructions

MM-317(A)

Summary of content (4 pages)

PAGE 1
McDonnell & Miller Installation & Maintenance Instructions MM-317(A) Model 21 and 221 Mechanical Water Feeders And Replacement Valve Assembly SA21-6 Applications: For receiver tanks in industrial or commercial applications. Model 21 Maximum water supply pressure: 150 PSIG (10.55 kg/cm2) Maximum vessel pressure: 35 PSIG (2.46 kg/cm2) Maximum fluid temperature: 120°F (49°C) SA21-6 Model 221 ! WARNING CAUT WARN ING ION • Before using this product read and understand instructions.
PAGE 2
OPERATION The Series 21 make-up water feeder provides dependable, float-operated automatic water filling service to tanks used as condensate receivers in boiler systems. The valve components are of brass, an elastomer sealing disc and stainless steel materials, and a 4-3/4” diameter copper float providing closure against supply pressure up to 150 PSI. An integral strainer and housing with removable drainage plug precede the valve for regular servicing.
PAGE 3
INSTALLATION TOOLS NEEDED: One (1) adjustable wrench, socket wrenches, two (2) pipe wrenches, pipe dope, assorted fittings and lengths of 3/4” pipe. STEP 1 - Preparation This Water Feeder mounts directly on the tank or vessel. The tank or vessel is to be manufactured with a mating flange (A) and opening large enough for the float. The flange can be either welded flush on the side or head and have pre-tapped mounting holes (preferred), or a necked or nozzle flange with plain mounting holes.
PAGE 4
McDonnell & Miller INSTALLATION (cont.) 21 Series - Replacement Valve Assembly (SA21-6) a. Remove Feeder from Tank. Turn off the water supply and drain the tank below the level of the feeder flange. If fluid is heated, allow system to cool to 80°F (27°C) before disassembly. Disconnect the piping above the strainer assembly. Remove the six (6) mounting bolts and lift off the feeder from the tank. b. Remove Valve Assembly. Remove float and rod from the float arm of the valve linkage.