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Part number 550-100-211/0122
– 39 –
220 /29 9/3 00 /39 9
Use two wrenches when tightening water piping
at boiler, using one of the wrenches to prevent
the boiler interior piping from turning. Failure to
support the boiler piping connections to prevent
them from turning could cause damage to boiler
components.
Additionalcontrols,ifrequired
e control uses temperature sensors to pro-
vide both high limit protection and modulating
temperature control. e control module also
provides low water protection by sensing the
temperature of the heat exchanger. Thecontrol’s
high limit function requires manual reset
.
Some codes/jurisdictions may require additional
external controls for high limit and/or low water
cuto protection.
Additionallimitcontrols
Following standard industry practices, if installation is to com-
ply with ASME or Canadian requirements, an additional high
temperature limit may be needed. Consult local requirements
for other codes/standards to determine if needed.
1. Install a manual reset high temperature limit constructed to
prevent a temperature setting above 200°F in system supply
piping between boiler and isolation valve. (Note that the
Control operating limit function shuts the boiler down at
195°F, or lower if set to a lower value.)
Multi-temperature systems — If the heat-
ing system includes circuits that require lower
temperature water (radiant slab circuits, for
example) as well as higher temperature circuits,
it is recommended to protect low-temperature
circuits with limit controls that are wired to a
Control external limit circuit terminals.
2. See instructions beginning on page52 for wiring informa-
tion.
3. When using a manual reset limit control or wiring in
the manual reset circuit, preferably set Max. Boiler Tem-
perature or Supply Max. at least 20°F less than the external
manual reset limit (i.e., set control no higher than 180°F
for a 200°F external limit, for example).
Separatelowwatercutoff
1. A separate low water cuto device is recommended when
the boiler is installed above piping level, and may be
required by certain state or local codes or insurance com-
panies. Consult local requirements to determine. See the
NOTICE above regarding the inherent protection provided
by the Control module. Low water cuto is standard equip-
ment with the Evergreen
®
boilers.
2. The Control’s integral protection is accepted in many
jurisdictions as meeting the requirement for low water
protection. See page56 for details.
3. When required, use a low water cuto designed for water
installations. Electrode probe-type is recommended.
See Replacement parts for the Weil-McLain low water cut-o
kit.
4. Purchase low water cuto and install in a tee in the supply pip-
ing above boiler.
5. See eld wiring instructions beginning on page52 for wiring
additional limit controls.
Backowpreventer
Use backow preventer in the cold water supply piping if required
by local codes.
(Baseboard,convectorsorcastironradiatorsONLY)
For residential space heating applications (other than radiant heat-
ing or unit heaters) ONLY, you can use the sizing suggestions in
Figure47.
Figure47 Suggested pipe sizing for boiler loop
Use at least the MINIMUM pipe size shown in
Figure47 on all boiler loop piping (connecting
boiler to and from the primary/secondary
connection). Use only primary/secondary
piping as shown.
Failure to follow these
guidelines could result in system problems.
Figure48 Pressure drop through the Evergreen
®
heat
exchanger
EVG 220 EVG299/300 EVG 399
Flow
Rate
(GPM)
Head
Loss
(ft. w.c.)
∆T
(°F)
Flow
Rate
(GPM)
Head
Loss
(ft. w.c.)
∆T
(°F)
Flow
Rate
(GPM)
Head
Loss
(ft. w.c.)
∆T
(°F)
10** 0.0 45 13** 0.0 45 18** 0.0 45
12 0.0 37 18 0.3 33 24 0.3 33
14 0.1 31 22* 0.6 27 28* 0.7 29
16 0.2 28 28 1.2 21 32 1.1 25
18* 0.2 24 32 1.7 19 36 1.6 22
20 0.3 22 – – – 40 2.2 20
22 0.5 20 – – – – – –
* Suggested design ow rates based on a 25°F (EVG
220/299/300) and 30°F (EVG 399) temp rise through the
boiler.
** Minimum ow rates.
Model Boiler loop
EVG 220 1¼” or larger
EVG 299, 300 or 399 1½” or larger
Recommendations are based on a 25°F (EVG 220/299/300)
and 30°F (EVG 399) temp rise through the boiler.
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