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Xylem MM 273E Model 750-HW-MT-120 Probe Type High Water Bedienungsanleitung

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Model 750-HW-MT-120
Probe Type High Water
Manual Reset Control Unit
Applications:
Conductance type control for steam boilers
when a manual reset high water alarm or
cut-off is required.
5-1/2"
M
odel
7
5
0
-
HW
-MT
-
12
0
P
r
ob
e
T
y
pe
H
i
gh
W
a
t
er
Con
t
r
o
l
Uni
t
Model 750-HW-MT-120
Control Unit
• Before using 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 and electrical equipment and/or systems in accordance with all
applicable codes and ordinances.
• Boiler manufacturer schematics should always be followed. In the event that the boiler
manufacturer’s schematic does not exist, or is not available from the boiler manufacturer,
refer to the schematics
p
rovided in this document.
• To prevent serious burns, allow the control and surrounding equipment to cool to 80˚F (27˚C)
and allow
p
ressure to release to 0
p
si
(
0 bar
)
before servicin
g
.
• To prevent an electrical fire or equipment damage, electrical wiring insulation must have a
rating of 167˚F (75˚C) if the liquid's temperature exceeds 180˚F (82˚C).
• This control can be installed in series with all other limit and operating controls installed
on the boiler. After installation, check for proper operation of all the limit and operating
controls, before leaving the site.
• When using mixed voltages, do not jumper from terminal 1 to terminal 3.
• To prevent electrocution, when the electrical power is connected to the control, do not touch
the terminals
,
or electrical wires.
• To prevent electrical shock, turn off the electrical power before making electrical connections.
WA
R
N
IN
G
CA
U
T
I
O
N
!
WARNING
INSTRUCTION MANUAL
Failure to fo
llow this warning could cause property damage, personal injury or death.
California Proposition 65 warning! This product contains chemicals known to the
state of California to cause cancer and birth defects or other reproductive harm.
Previous controls should never be installed on a new system. Always install new
controls on a new boiler or system.
CAUTION:
A more frequent replacement interval may be necessary based on the condition of
the unit at time of inspection. McDonnell & Miller's warranty is one (1) year from date
of installation or two (2) years from the date of manufacture.
•
•
•
MM-273E
Seitenansicht 0
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Inhaltsverzeichnis

Seite 1 - Manual Reset Control Unit

Model 750-HW-MT-120Probe Type High WaterManual Reset Control UnitApplications:Conductance type control for steam boilerswhen a manual reset high water

Seite 2 - SPECIFICATIONS

Motor Switch Rating (Amperes)Model Voltage Full Load Locked Rotor Pilot Duty120 VAC 7.2 43.2125 VA at120 VAC240 VAC 3.6 21.6120 or 240 VAC50 or 60 Hz2

Seite 3

Determine where to install the remote sensor (sold separately) based on the following requirements:Option Aa. The Remote Sensor can be installed direc

Seite 4 - 1/4" MIN. (6.4 mm)

41/4" MIN. (6.4 mm)1/4" MIN. (6.4 mm)B BMc. Insert the remote sensor (B) into the boilertapping (M) as determined in Step 1.NBPd. Using a w

Seite 5 - IMPORTANT

5CDE(x2)Model 750-HW-MT-120Probe Type High WaterControl Unita. Using the flatblade screwdriver or nut driver (C),loosen the two (2) screws (D) and r

Seite 6 - Wiring Diagram Legends

6Wiring Diagram Legends1. Bold lines indicate action to be taken in Step shown.2. Dotted black lines indicate internal wiring.PROBE123 4 5WHITENEUTRAL

Seite 7 - Start-Up

7RD(x2)Model 750-HW-MT-120Probe Type High WaterControl Unitd. Secure the control housing cover by using theflatblade screwdriver or nut driver (R) t

Seite 8 - McDonnell & Miller

TroubleshootingMAINTENANCESCHEDULE:• Inspect probe annually or more frequently for scale build-up and clean or replace if necessary.Make certain there

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