Install Instructions

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies5M, Electric Switch w/ Manual Reset for 93, 193

Replacement Switch Assembly

5 Burner/Pump Control

5-M Burner/Pump Control – Manual Reset

7B Proportional Control

7B-M Proportional Control – Manual Reset

For Series:

93 94

193 194

Pump Controller/Low Water Cut-Off

Electrical Ratings

Models with 5 and 5-M Switch

Models with 7B and 7B-M Switch

• 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, installation, and maintenance of plumbing, steam, and electrical

equipment and/or systems in accordance with all applicable codes and ordinances.

• To prevent a fire, do not exceed the switch contact rating.

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

death.

WARNING

Replacement Switch

Switch Ratings

Burner Valve

120 VAC

345 VA 0 - 135 ohms @ 24 VAC

240 VAC

Pump and Burner Switch Contact Ratings

Voltage Pilot Duty Only

120 VAC

345 VA

240 VAC

McDonnell & Miller

Installation & Maintenance

Instructions

MM-706(A)

Summary of content (4 pages)

PAGE 1
McDonnell & Miller Installation & Maintenance Instructions MM-706(A) Replacement Switch Assembly 5 5-M 7B 7B-M ® Burner/Pump Control Burner/Pump Control – Manual Reset Proportional Control Proportional Control – Manual Reset For Series: 93 94 193 194 Pump Controller/Low Water Cut-Off Replacement Switch Electrical Ratings Models with 7B and 7B-M Switch Models with 5 and 5-M Switch Voltage 120 VAC Switch Ratings Pump and Burner Switch Contact Ratings Pilot Duty Only 345 VA 240 VAC Burner 120 VAC 3
PAGE 2
STEP 1 - Removal and Replacement of Contacts and Terminal Panels a. Turn power off to boiler and all controls. Allow boiler to cool to 80˚F (27˚C) and reduce the pressure to 0 psi (0 bar). ! ON CAUTION OFF There may be more than one source of power to the boiler. b. Remove and Replace Switch Assembly • Remove two screws (A) and lift off switch cover. A • Identify terminal connections for rewiring and then disconnect all wires from terminal panels.
PAGE 3
STEP 2 - Testing – Dimensions shown are typical. – The following testing procedure is only meant to serve as a verification of proper operating sequence. a. Turn on power to boiler and pump circuits. With the boiler empty, the pump should turn on (5 or 5-M switch models) or the valve open (7B or 7B-M switch models). The burner should remain off and boiler should begin to fill with water. ! CAUTION Immediately turn off all power if the burner turns on with no water in the gauge glass.
PAGE 4
McDonnell & Miller 8200 N. Austin Ave. Morton Grove, IL 60053 tel: 847-966-3700 fax: 847-966-9052 www.mcdonnellmiller.com ©2006 ITT Corporation Printed in U.S.A.