®
Series 3
WATER
BOILER
— Boiler Manual
T
HE
®
WATER
BOILER
– H
OW
IT
WORKS
. . .
1.
Weil-McLain logo plate (standard) or
Remote Display Module (optional)
The Remote Display Module (RDM) is used when the optional
AFM (item 28) 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 limit temperature sensor, 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. Burner wire harness
Line voltage wiring to burner, terminated in a Molex connector
in the jacket cross tie (item 19). An additional harness connects
from the cross tie connector to the burner.
14. Burner door hinge bracket
The hinge bracket can be installed on either side to allow for right
or left-hand swing.
15. Swing-away burner door
The
®
burner door is hinged to provide easy access to the
boiler heat exchanger for inspection and cleaning.
16. Rotating observation port
The
®
observation port is designed to prevent soot from
depositing on the sight glass. During normal operation the sight
glass is located at the 12:00 position. To view the burner fl ame,
loosen the center mounting bolt and rotate so the sight glass is
in the 6:00 position.
17. Overfi re pressure tapping
1/8” npt, with plug.
18. Jacket cross tie
19. Sensor
wells
Boiler limit temperature sensor and P/T gauge capillary and tem-
perature sensor are installed in the top of the rear section.
20. Outlet
tapping
The boiler outlet water tapping is located in the top of the rear
section.
21. Return
tapping
The boiler return tapping is located in the bottom of the rear
section.
22. Insulation
blanket
23. Leveling
legs
24. Boiler drain valve
25. Flue connection
®
boilers can be chimney or direct vented from the rear
fl ue 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
) —
Optional
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 20-amp
service.
29. Temperature Limit/LWCO Control with Thermal
Targeting
TM
The Ultra Oil boiler is equipped with a Hydro-
level 3250 HydroStat®, LWCO and temperature limit control
with energy saving technology. The 3250 senses the presences
of water, water temperature and monitors calls for heat and
activates the boiler pump and circulator. The control logic will
delay pump or burner operation and adjust them for the target
water temperature to optimize effi ciency.
30.
Burner, with cover
31. Jacket front panel
Part number 550-142-182/1014
2