Specifications
Part number 550-142-120/0113
WM97+ gas-fired water boiler — Boiler Manual
– 70 –
EXPRESS SETUP — using default settings (continued)
Figure 80 Using default control settings (No DHW)
ZONE VALVE-zoned systems
primary/secondary piping
Figure 81 Using default control settings (No DHW)
ZONE VALVE-zoned systems
direct connection piping (
NOT for WM97+155)
Legend and guidelines — Figure 80 and Figure 81
1. Recommendation: Wire zone thermostats to zone valves. Wire zone
valve end switches to the ZONE 2 input on the 24-VAC terminal strip.
See Figure 76, page 66. Use isolation relays if connecting 3-wire zone
valve end switches. Boiler ZONE 1 and ZONE 3 are not used.
2. Figure 80 ONLY — Wire the CIRC2 circulator output to the system
circulator. See Figure 75, page 65. CIRC1 and CIRC3 are not used.
Use Figure 81 ONLY if the system meets
the limitations given on page 44 and
page 45. Install a system circulator when
applying Figure 80. Failure to comply
could cause heat delivery problems.
1 WM97+ boiler
2 Indirect water heater, if used
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 39
5 DHW circulator
6 Isolation valves
7 System circulator
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
13 Zone valves
14
Primary/secondary by-
pass valve — see page 40 or
page 41 for information —
OPEN: Boiler connected as
primary/secondary
20 Make-up water supply
21 By-pass pressure regulator,
REQUIRED for zone valve
systems
23 Backflow preventer, if used
24 Zone circulators
25 Pressure reducing valve, if
used
26
70/110 only — Internal
expansion tank, diaphragm-
type
27 Quick-fill valve, if used
28
DHW boiler water supply
connection, when used — see
page 13 for information
29
DHW boiler water return
connection, when used — see
page 13 for information
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