Weil-McLain Ultra Installation Manual page 2
Commercial gas-fired water boilers
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Also See for Ultra:
- Installation and start-up manual (113 pages) ,
- Manual (108 pages) ,
- Manual addendum (28 pages)
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V V e
Vent, 6"
en
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a
Boiler loop circulator, by installer
b
Boiler loop piping, minimum 2"
c
Flow/check valve in boiler loop
d
Strap-on system supply and return
temperature sensors, supplied
with boiler
e
System circulator, typical, by
installer
f
Air separator, by installer
Material checklist — piping and other
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Air, 6"
A
ir, 6"
Electrical
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Su
Supply, 2"
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Gas, 1¼"
Ga
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Return, 2"
Re
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Co
Condensate
dr
drain, 1"
g
Expansion tank and make-up
water components, by installer
h
Install a union near boiler on sup-
ply and return connections
i
Boiler relief valve, field installed on
2-inch tee (supplied with boiler)
j
Install bibb valves for purging
k
Install a ¾-inch boiler drain valve
(by others) on the boiler return
connection
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Boiler loop piping and components
The piping must be installed as primary/secondary, with the boiler on its own loop as
The pipin
shown in the Ultra boiler manual and in this guide. Use the pipe sizes listed below.
Pipe, valves, (2) unions and other fittings:
(include flow/check valve)
Boiler loop circulator (by installer) — Recommended sizing is for a 30°F temperature
rise (= 35 GPM for Ultra-550 or 45 GPM for Ultra-750) — Allow 11 feet w. c.
head loss through boiler at recommended flow rates (Taco 1400-50 or equivalent)
Boiler drain valve, ¾"
System, DHW and zone piping and other piping
System circulator and zone circulators (or zone valves)
DHW circulator
Pipe, valves and fittings for system, DHW and zone piping
Air separator and expansion tank
Fresh water make-up piping and components
Gas piping, valves and fittings; union & manual valve for boiler connection
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Install a lock-up regulator if gas pressure can exceed 14" w.c.
Relief valve — ¾" pipe and elbows for discharge piping
Pipe or tubing for condensate line — 1" PVC pipe connection
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Condensate neutralizing kit when req' d (W-M part # 383-500-076)
Condensate pump (required if condensate cannot drain by gravity)
Antifreeze, when required — Use only antifreeze listed in Ultra boiler manual
as suitable for use with Ultra Gas boilers — Ask your Weil-McLain distributor for
information or visit us online at www.weil-mclain.com to review Ultra literature.
Special applications
Propane — Propane conversion kit is supplied with the boiler. See boiler manual.
High altitude — High altitude (over 5,500 feet) requires only changing the altitude
setting on the U-Control.
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Electrical connections
Wiring materials, fuses/breakers and shut-off switches
Wiring m
Boiler line voltage power — Boiler load is 18 amps. Provide a fused disconnect or
service switch (25- or 30-ampere rated recommended) as required by codes.
Boiler circulator line voltage power — Provide and install a fused disconnect
or service switch (15-ampere rated recommended) as required by codes for circulator
with maximum load of 10 amps.)
Zone valves and other system control devices, as required
Carbon monoxide detector, when required
Recommended equipment
Use a combustion analyzer to verify boiler operation, see the Ultra boiler manual.
U-tube manometer for checking gas line pressure
Volt-ohmmeter may be required for troubleshooting
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Ultra-550
2" or larger
Ultra-750
Other
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