Xylem MM 243D Replacement Head Mechanism 42S HD Instrukcja Użytkownika

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INSTRUCTION MANUAL
MM-243D
2
Approximate
Distance Above
Cast Line Differential
Setting In. (mm) In. (mm)
Pump Off 1
3
/8 (35)
3
/4 (19)
Pump On
5
/8 (16)
Burner On
7
/8 (22)
7
/8 (22)
Burner Off 0 (0)
NORMAL BOILER
WATER LINE
PUMP
OFF
BURNER
OFF
BURNER
“CUT-OFF LEVEL
AT CAST LINE
1 3/8" (35mm)
CUT-OFF 
LEVEL
NORMAL BOILER
WATER LINE
CUT-OFF 
LEVEL
PUMP OFF
PUMP ON
3/4" (19mm)
OPERATION
Maximum Pressure: 50 psi (3.5 kg/cm
2
)
Electrical Ratings
Settings and Differential Pressures
Values are ± 8” (3.2mm).
Series 42S
50 psi
(3.5 kg/
cm
2
)
Pressure
Pump Circuit Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4
345 VA at
240 VAC 3.7 22.2
120 or 240 VAC
NORMAL BOILER
WATER LINE
BURNER
CUT-OFF LEVEL
AT CAST LINE
7/8" (22 mm)
BURNER ON
BURNER OFF
CUT-OFF 
LEVEL
Motor Horsepower
Voltage Hp
120 VAC
1/3
240 VAC 1/3
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 serious burns, the boiler must be cooled to 80˚F (27˚C) and the pressure must be
0 psi (0 bar) before servicing.
To prevent electrical shock, turn off the electrical power before making electrical connections.
This low water cut-off must be installed in series with all other limit and operating controls
installed on the boiler. After installation, check for proper operation of all of the limit and
operating controls, before leaving the site.
To prevent serious personal injury from steam blow down, connect a drain pipe to the
control opening to avoid exposure to steam discharge.
To prevent a fire, do not use this low water cut-off to switch currents over 7.4A, 1/3 Hp at
120 VAC or 3.7A, 1/3 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.
WARNING
CAUTION
!
WARNING
Replacement Head Mechanism
Replacement head mechanisms can be installed without
disturbing existing equalizing connections or disassembly
of components, making repairs simple and easy.
Replacement Head Mechanism
42S-HD
(Snap Switch)
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Podsumowanie treści

Strona 1 - Replacement Head Mechanism

INSTRUCTION MANUAL MM-243D2ApproximateDistance AboveCast Line DifferentialSetting In. (mm) In. (mm)Pump Off 13/8 (35)3/4 (19)Pump On5/8 (16)Burner

Strona 2 - McDonnell & Miller

2ApproximateDistance AboveCast Line DifferentialSetting In. (mm) In. (mm)Pump Off 13/8 (35)3/4 (19)Pump On5/8 (16)Burner On7/8 (22)7/8 (22)Burner

Strona 3 - INSTALLATION –

d. Using a wrench, insert the four (4) bolts andtighten them to approximately 14-20 ft•lb (19-27 N•m) in an alternating star pattern.GFHb. Align the b

Strona 4

d. Using a wrench, insert the four (4) bolts andtighten them to approximately 14-20 ft•lb (19-27 N•m) in an alternating star pattern.GFHb. Align the b

Strona 5 - STEP 3 - Electrical Wiring

WIRING DIAGRAMSLow Water Cut-Off Only1. Main Line Switch - For burner circuits within the switch’s electrical rating.Pump Control Only1. Install a sta

Strona 6

WIRING DIAGRAMSLow Water Cut-Off Only1. Main Line Switch - For burner circuits within the switch’s electrical rating.Pump Control Only1. Install a sta

Strona 7 - MAINTENANCE

ITT8200 N. Austin Ave.Morton Grove, IL 60053tel: 847-966-3700fax: 847-966-9052www.mcdonnellmiller.com©2008 ITT Corporation Printed in U.S.A. 12-08

Strona 8

Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379www.xyleminc.com/brands/mcdonnellmillerMcDonnel

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