Part number 550-142-058/0811
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
50
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 control module 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).
3. The terminal units in the system must be finned tube base-
board only. (Other terminal units require changes in the
control module setup.)
4. The control is set up to accept up to three inputs from zone
thermostats or end switches.
5. The control module will regulate boiler outlet water tem-
perature as follows:
a. Outdoor sensor installed (recommended):
180°F at 0°F outside temperature
130°F at 70°F outside temperature
b. Outdoor sensor not installed:
180°F fixed target temperature
6. If the system is
zoned with circulators
, follow the guidelines
in Figure 55 and guidelines below the illustration.
7. If the system is
zoned with zone valves
, follow Fig-
ure 56, page 51 or Figure 57, page 51 Figure 55 and guidelines
below each illustration.
Use Figure 57, page 51ONLY if the system meets the
limitations given on page 36 and page 37. Install a
system circulator when applying Figure 56, page 51.
Failure to comply could cause system problems.
Figure 55
Using default control settings (
No DHW
)
CIRCULATOR-zoned systems
primary/secondary piping
Legend and guidelines — Figure 55
1. Wire the circulator outputs (Zone 1, Zone 2 and Zone 3)
to the zone circulators. See Figure 51, page 46.
2. Wire the zone thermostats to the Zone 1, Zone 2 and Zone 3
inputs on the 24-VAC terminal strip. See Figure 52, page 47.
The piping shown is adapted from Fig-
ure 43, page 39,
without DHW connected
.
The control module settings would have to be
changed to allow DHW operation. Follow all
appropriate instructions on page 39.
1
WM97+ boiler
3
Relief valve, supplied with
boiler, field piped — MUST be
piped to boiler supply connec-
tion — see page 10 for informa-
tion
4
Relief valve piping to drain —
see page 33
6
Isolation valves
8
Supplementary expansion tank,
diaphragm type, when 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 34 for infor-
mation — OPEN: Boiler con-
nected as primary/secondary
20
Make-up water supply
23
Backflow preventer, when used
24
Zone circulators
25
Pressure reducing valve, when
used
26
Internal expansion tank,
diaphragm-type
27
Quick-fill valve, when used
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
