Xylem MM 714C User Manual

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Replacement Pump and Burner Switch Arm Contacts with Terminal Panel
SA91-30B SA91-30P
INSTRUCTION MANUAL
MM-714C
For installation on 5, 5-M, 7B or 7B-M Switch Assemblies
Electrical Ratings
Models with 5 or 5-M Switch
Pump and Burner Switch Contact Ratings
Voltage Pilot Duty Only
120 VAC
345 VA
240 VAC
Models with 7B or 7B-M Switch
Switch Ratings
Burner Valve
120 VAC
345 VA 0 - 135 ohms @ 24 VAC
240 VAC
Terminal Panel
Switch Arm Contact
WARNING
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.
O
FF
O
N
STEP 1 - Removal and Replacement of Contacts and Terminal Panels
BURNER
SWITCH
LEVER
STOPS
A
C
E
TOWER
TUBE
FITTIN
G
H
U
B
S
WITC
H
H
O
U
S
IN
G
T
E
RMINA
L
CO
NNE
CT
IO
NS
S
WIT
C
H
C
O
V
E
R
P
U
MP
T
E
R
MIN
A
L
P
A
N
E
L
B
U
R
N
E
R
T
E
R
MIN
A
L
P
A
N
E
L
C
O
N
D
U
I
T
C
O
N
N
E
C
T
O
R
N
AM
EPLAT
E
NA
ME
P
L
A
TE
BASE
PLAT
E
B
D
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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).
CAUTION
There may be more than one source of power to the boiler.
b. Remove Switch Assembly, Terminal
Panels and Switch Housing
• Remove two screws (A) and lift off switch
cover.
• Identify terminal connections for rewiring and then disconnect all wires from terminal
panels.
• Remove conduit connector and wire from integral fitting hub.
• Remove four hex nuts (B) and carefully lift switch assembly up and off tower tube.
• Remove two screws (C) and remove
nameplate.
• Loosen and remove four screws (E) that hold pump and burner terminal panels in place. Do not remove terminal panels at
this time.
• Reach through nameplate opening and hold burner switch lever about midway between upper and lower stops to move contact arms into correct (upright) position. With contact arms in upright position, carefully remove burner terminal panel.
• Reach through nameplate opening and hold pump switch lever about midway between upper and lower stops to move contact arms into correct (upright) position. With contact arms in upright position, carefully remove pump terminal panel.
• Loosen four screws (E) and carefully lift switch housing up off base plate.
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