4
110839-01 - 8/20
AP-U
Installation & Service Manual
WARNING
This boiler contains very hot water under 12 - 15 PSI pressure. DO NOT unscrew any pipe fittings nor attempt
to disconnect any components of this boiler without positively assuring the water is cool and has no pressure.
Always wear protective clothing and equipment when installing, starting up or servicing this boiler to prevent
scald injuries. DO NOT rely on the pressure and temperature gauges to determine the temperature and
pressure of the boiler. This boiler contains components which become very hot when the boiler is operating.
DO NOT touch any components unless they are cool.
• High water temperatures increase the risk of scalding injury. If this boiler is equipped with a tankless heater
for domestic water supply, a flow regulator and automatic mixing valve must be installed properly in tankless
heater piping. See Piping and Trim Sections of this manual for details.
• This boiler needs fresh air for safe operation and must be installed so there are provisions for adequate
combustion and ventilation air.
• This boiler must be connected to an approved chimney or vent system in good condition. Serious property
damage could result if the boiler is connected to a dirty or inadequate chimney or vent system. The interior of
the chimney flue must be inspected and cleaned before the start of the heating season for any obstructions.
A clean and unobstructed chimney flue is necessary to allow noxious fumes that could cause injury or loss of
life to vent safely and will contribute toward maintaining the boiler’s efficiency. DO NOT operate boiler with the
absence of an approved vent system.
• This boiler is supplied with controls which may cause the boiler to shut down and not re-start without service.
If damage due to frozen pipes is a possibility, the heating system should not be left unattended in cold
weather; or appropriate safeguards and alarms should be installed on the heating system to prevent damage if
the boiler is inoperative.
• This boiler is designed to burn No. 2 fuel oil only. DO NOT use gasoline, crankcase drainings, or any oil
containing gasoline. Never burn garbage or paper in this boiler. DO NOT convert to any solid fuel (i.e. wood,
coal). DO NOT convert to any gaseous fuel (i.e. natural gas, LP). All flammable debris, rags, paper, wood
scraps, etc., should be kept clear of the boiler at all times. Keep the boiler area clean and free of fire hazards.
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Summary of Contents for AP-U AP-110U-N
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