Weil-McLain WM97+110, Manual, Page: 67 / 132

Part number 550-142-085/0712
– 67 –
WM97+
gas
-
fired water boiler
— Boiler Manual
EXPRESS SETUP — using default settings
MANDATORY CONTROL SETTINGS
— The
following settings must be checked and adjusted
if necessary: BOILER MODEL and HIGH AL-
TITUDE in BOILER SETTINGS menu. Also
enter information at the MAINTENANCE INFO
screen. See instructions on the following pages
for menu access and control settings.
1.
The WM97+ control is factory set to supply three zones of
space heating ONLY. Control settings must be changed
to operate a DHW circuit
.
2. All zones use the same temperature settings (or outdoor reset
curve if outdoor sensor is connected — see page 129).
3. The terminal units in the system must be finned tube base-
board only. (Other terminal units require changes in the
WM97+ control setup.)
4. The control is set up to accept up to three inputs from zone
thermostats or end switches.
5. The WM97+ control will regulate boiler outlet water tem-
perature as follows:
a. Outdoor sensor installed (see page 129):
180°F at 0°F outside temperature
130°F at 70°F outside temperature
b. Outdoor sensor not installed (see page 129):
180°F fixed target temperature
6. If the system is
zoned with circulators
, follow the guidelines
in Figure 75 and guidelines below the illustration.
7. If the system is
zoned with zone valves
, follow Fig-
ure 76, page 68 or Figure 77, page 68 Figure 75 and guidelines
below each illustration.
Use Figure 77, page 68
ONLY
if the system meets the
limitations given on page 42 and page 43. Install a
system circulator when applying Figure 76, page 68.
Failure to comply could cause system problems.
Figure 75
Using default control settings (
No DHW
)
CIRCULATOR-zoned systems
primary/secondary piping
Legend and guidelines — Figure 75
1. Wire the circulator outputs (CIRC 1, CIRC 2 and CIRC 3)
to the zone circulators. See Figure 71, page 63.
2. Wire the zone thermostats to the Zone 1, Zone 2 and Zone 3
inputs on the 24-VAC terminal strip. See Figure 72, page 64.
The piping shown is adapted from Fig-
ure 51, page 46,
without DHW connected
.
The WM97+ control settings would have to be
changed to allow DHW operation. Follow all
appropriate instructions on page 46.
1
WM97+ boiler
3
Relief valve, supplied with
boiler, field piped — MUST
be piped to boiler supply
connection — see page 13 for
information
4
Relief valve piping to drain —
see page 37
6
Isolation valves
8
Supplementary expansion
tank, diaphragm type, if used
9
Air separator
10
Flow/check valves
11
Purge/drain valves (one drain
valve is supplied loose with
the boiler)
12
Boiler circulator, with inte-
gral flow/check valve, factory
installed in boiler
14
Primary/secondary by-
pass valve — see page 38 or
page 39 for information —
OPEN: Boiler connected as
primary/secondary
20
Make-up water supply
23
Backflow preventer, if used
24
Zone circulators
25
Pressure reducing valve, if
used
26
Internal expansion tank,
diaphragm-type
27
Quick-fill valve, if used
28
Install pipe cap supplied with
boiler (see Figure 7, page 13)
27
Install drain valve supplied
with boiler (see Fig-
ure 7, page 13)
30
Pressure/temperature
gauge, supplied with boiler,
field piped
31
Heating circuits
32
Additional heating circuits, if
any
= Items supplied with boiler
— all other items supplied by
installer