Install Instructions

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies94-7B, Combo Low Water Cut-Off & Pump Controller w/ No. 7B Switch

1

2

3

4

5

6

7

8

9

9

TO BURNER

LINE

13

4

4

3

2

1

COMMON

CLOSING CIRCUIT

OPENING CIRCUIT

NO. 7B

SWITCH

BLUE

RED

Proportional Control, Low Water Cut-Off and Alarm

2 4

1 3

BLUE

BURNER ON–ALARM OFF

VALVE CLOSED

BURNER ON–ALARM OFF

VALVE OPEN

BURNER OFF–ALARM ON

VALVE OPEN

RED

3 1

4

2 4

1 3

BLUE

RED

3 1

4

2 4

1 3

BLUE

RED

3 1

4

NOTE: The 7B switch is a 135 ohm potentiometer slide

wire control for use with an electric valve operator with

the same rating.

For Series 93/193 or 94/194 with 7B or 7B-M

Red terminals 1 and 2 are the burner circuit contacts, terminals 3 and 4 are the low level alarm circuit

contacts.

Blue terminal 3 is the common contact, terminals 1 and 4 are the output contacts.