LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 19)

SUMMIT BOILER OR WATER HEATER Page 19
6.2 Anti-Freeze SMW-200/250 Water
Heater
Summit water heaters are equipped with a Low
Temperature control feature that recognizes when the
water temperature at the outlet of the heater has fallen
below 39°F (4°C). If this condition is recognized, the
Summit pump will run for 5 minutes, or until the
heater outlet temperature reaches 45°F (7°C). If the
heater outlet temperature remains below 45°F (7°C)
for 5 minutes, the appliance will start its ignition
sequence, in hopes of firing the heater and heating the
water. The display will show [ICE] during this time.
This feature is intended to assist in protecting the
heater from freezing conditions, and does not help to
protect any other part of the water heater system. This
feature will only help when there is power to the
heater and when the internal water flow components
in the Summit are working properly. This feature will
not be able to prevent freezing if the low temperature
water condition persists.
Power outage, interruption of gas supply, failure
of system components, activation of safety devices,
etc., may prevent a heater from firing. Any time a
heater is subjected to freezing conditions, and the
heater is not able to fire, and/or the water is not
able to circulate, there is a risk of freezing in the
heater or in the pipes in the system. When water
freezes, it expands. This can result in bursting of
pipes in the system, or damage to the heater, which
could result in leaking or flooding conditions.
Anti-freeze additives, such as glycol, must not be
used in a direct potable water heating system, such as
the Summit SMW.
6.3 Filling the System
1. Open all supply and return valves.
2. Fill system to minimum operating pressure 12
psig.
3. Bleed air from the coin vent on the top of the
mixing valve.
4. Purge all lines by opening vents.
5. Turn off gas shutoff valve located above gas
valve.
6. Switch on 120 volt power, the display will
initially display [---] for five seconds before
displaying [OFF].
7. If the flow (appliance discharge) temperature
sensor is detecting a temperature below 39°F
(4°C) it will display [ICE]. The appliance will
then be in its Low Temperature Feature. The
Summit will call for the pump to run for 5
minutes, or until the discharge temperature
reaches 45°F (7°C). If the water temperature
remains below 45°F (7°C) for 5 minutes, the
Summit will attempt an ignition, in hopes of
warming the water. After three attempts to
6.1 Anti Freeze
SMB-200/250 Boilers
Proper precautions for freeze protection are
recommended for boiler installations in areas where
the danger of freezing exists.
6.1.1 Summit Boiler Low Temperature
Feature
Summit boilers are equipped with a Low
Temperature control feature that recognizes when the
water temperature at the outlet of the boiler has fallen
below 39°F (4°C). If this condition is recognized, the
Summit pump will run for 5 minutes, or until the
boiler outlet temperature reaches 45°F (7°C). If the
boiler outlet temperature remains below 45°F (7°C)
for 5 minutes, the appliance will start its ignition
sequence, in hopes of firing the boiler and heating the
water. The display will show [ICE] during this time.
This feature is intended to assist in protecting the
boiler from freezing conditions, and does not help to
protect any other part of the heating system. This
feature will only help when there is power to the
boiler and when the internal water flow components in
the Summit are working properly. This feature will
not be able to prevent freezing if the low temperature
water condition persists. See section 6.1.2 for
information concerning further freeze protection for
the Summit.
6.1.2 Anti-Freeze Boiler Additives
Power outage, interruption of gas supply, failure
of system components, activation of safety devices,
etc., may prevent a boiler from firing. Any time a
boiler is subjected to freezing conditions, and the
boiler is not able to fire, and/or the water is not
able to circulate, there is a risk of freezing in the
boiler or in the pipes in the system. When water
freezes, it expands. This can result in bursting of
pipes in the system, or damage to the boiler, which
could result in leaking or flooding conditions.
Do not use automotive anti-freeze. Maintaining
a mixture of minimum 65% water and maximum 35%
properly inhibited HVAC glycol, which contains an
anti-foamant, is the preferred method of freeze
protection for Summit boilers. Percentage of glycol
used in the Summit boiler must not exceed 35%.
Typically, this mixture will serve as freeze protection
for temperatures down to approximately 0°F (-18°C),
and will serve as burst protection for temperatures
down to approximately –35°F (-30°C).
IMPORTANT NOTES: Different glycol
products may provide varying degrees of protection.
Glycol products must be maintained properly in a
heating system, or they may become ineffective.
Consult the glycol specifications, or the glycol
manufacturer, for information about specific products,
maintenance of solutions, and set up according to your
particular conditions.