Xylem MM 704B No. 2 Switch For series 47, 247, 63, 51, and 53 water feeders to add the low water cut-off function - Manual

INSTRUCTION MANUAL
MM-704B
2
B
OR
A
a. Remove the four (4) screws that secure the
cover plate (A) or the existing switch.
b. Mount the new switch on top of the control (B)
using the (4) screws.
The No. 2 switch can be positioned with the conduit
opening facing toward or away from the float chamber.
These are the only positions in which the switch will
function properly. See drawing at right.
SCHEMATIC OF SWITCH OPERATION
Water Level
Normal
Burner On
Alarm Off
Low
Water
Alarm
Terminals
Low Water
Cut-Off
Terminals
C.
N.O.
N.C.
Water Level
Low
Burner Off
Alarm On
C.
N.O.
N.C.
N. O.
N.C.
C.
The No. 2 Switch will help to maintain a minimum
water level in the boiler during normal operation.
The switch will shut off the burner in the event the
boiler water level falls. Once the water level is
restored to its normal level, the switch will allow
the burner to operate.
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver and one (1) 5/16” socket wrench.
STEP 1 - Switch Installation
No. 2 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, instal-
lation, 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 use this low water cut-off to switch currents over 10.2A, 1/2 Hp at
120 VAC or 5.1A, 1/2 Hp at 240 VAC, unless a starter or relay is used in conjunction with it.
Failure to follow this warning could cause property damage, personal injury or death.
WAR NING
CAUT ION
! WARNING
®
OPERATION
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 10.2 61.2 125 VA at
240 VAC 5.1 30.6 120 or 240 VAC
No. 2 Switch
Applications:
For series 47, 247, 63, 51, and 53 water
feeders to add the low water cut-off
function.