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water boiler
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1. Weil-McLain logo plate (standard) or
Remote Display Module (optional)
The Remote Display Module (RDM) is used when the optional
AFM (item 8) is installed. The display shows boiler and system
status and is used to adjust operating parameters.
2. ON/OFF switch
3. Control Pod cover fastener
4. Pressure/Temperature gauge
Displays boiler water pressure and outlet water temperature.
5. Jacket top rear panel
6. Control Pod cover
The
Control Pod cover is hinged to allow easy access
to the aquastat, boiler wiring and optional Advanced Features
Module (AFM).
7. Jacket side panels
jacket side panels are interchangeable.
8. Jacket rear panel, with insulation
9. Terminal strip
Electrical connections, both line and low voltage, connect to the
terminal strip.
10. Front section
11. Intermediate sections
12. Back section
13. EnviraCOM
wire harness
®
Low voltage wire harness from L748 aquastat to the Honeywell
burner primary control's EnviraCOM® connector — a commu-
nications port designed to optionally allow you to add greater
system capability at the time of installation. Examples include
test instruments and dial-in access and, in the future, efficiency
optimization, zoning, and sequencers. Look for products with
the Honeywell EnviraCOM® name indicating products that are
compatible with your new boiler.
14. Burner wire harness
Line voltage wiring to burner, terminated in a Molex connector in
the jacket crosstie (item 19). An additional harness connects from
the crosstie connector to the burner.
15. Burner door hinge bracket
The hinge bracket can be installed on either side to allow for right
or left-hand swing.
16. Swing-away burner door
The
burner door is hinged to provide easy access to the
boiler heat exchanger for inspection and cleaning.
17. Rotating observation port
The
observation port is designed to prevent soot from
depositing on the sight glass. During normal operation the sight
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glass is located at the 1:00 position. To view the burner flame,
loosen the center mounting bolt and rotate so the sight glass is
in the 6:00 position.
18. Overfire pressure tapping
1/8" npt, with plug.
19. Jacket crosstie
20. Sensor wells
Boiler aquastat sensor and P/T gauge capillary and temperature
sensor are installed in the top of the rear section.
21. Outlet tapping
The boiler outlet water tapping is located in the top of the rear
section.
22. Return tapping
The boiler return tapping is located in the bottom of the rear
section.
23. Insulation blanket
24. Boiler drain valve
25. Flue connection
boilers can be chimney or direct vented from the rear
flue opening.
26. Knockouts in jacket rear for electrical conduits
All electrical connections enter in conduits connected to these
knockouts.
27. Boiler relief valve
28. AFM (
Advanced Features Module
The
boiler can be equipped with the Advanced Features
Module (AFM). The AFM is a system control that provides boiler
outdoor reset, a boiler setpoint temperature, domestic hot water
pump operation, and outdoor reset through the use of a mixing
valve or a variable speed injection pump. It also controls staging
and rotation of two boilers.
When equipped with an AFM, the boiler requires a 0-amp
service.
29. Electronic Aquastat
The
boiler is equipped with a Honeywell L748 electronic
aquastat. The L748 senses boiler water temperature and call for
heat from the system thermostat or AFM to operate the burner
and boiler circulator.
30. Burner, with cover
31. Jacket front panel
32. Leveling legs
) — Optional
Part number 550-141-986/1005
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