Dunkirk DWB Series - Manual (Page 11)

11
5 - HYDRONIC PIPING
5.1 General
• Install piping in accordance with authority having jurisdiction.
NOTICE
Use two (2) wrenches when tightening and fi tting
pipe to boiler's threaded fi ttings. Boiler's internal
piping can be damaged if subjected to excessive
torque.
• Support system piping and safety relief valve discharge
piping. Boiler's internal piping and wall mount bracket
can be damaged if subjected to excessive weight.
• Size central heating pump (and domestic hot water
pump, if used) for system requirements only. Internal
heat exchanger pump compensates for pressure drop
through boiler internal piping and heat exchanger.
• Thoroughly clean and fl ush system before connecting to boiler.
• If oil is present in system water, use approved detergent to
wash system.
• Flush system to remove any solid objects such as metal chips,
fi bers, or Tefl on tape, etc.
5.2 Water System Characteristics
• Water in the heating system must have protection of
metallic materials against corrosion.
• Filling water and subsequent replenishing, must be
clear, with hardness under 150 ppm CaCO3,
A. treated with approved conditioning chemicals
to ensure prevention of corrosion and attack on
metals and plastics, that gases do not form,
B. and bacterial or microbial masses do not proliferate
in low temperature systems.
• Hardness exceeding 150 ppm CaCO3, appropriate water
softening treatment and/or use of suitable anti-fouling
agents must be provided.
Water contained in the system must be checked at least
yearly and have:
A. pH above 7 and under 8.5 (under 8 with presence
of components in aluminum or light alloys),
B. iron content (Fe) less than 0.5 mg/l,
C. copper content (Cu) less than 0.1 mg/l,
D. total content of chlorides, nitrates and sulfates less
than 50mg/l,
E. must contain conditioning chemicals in
concentration suffi cient to protect system for a
year.
There must be no microbial or bacterial loads in low
temperature systems.
Conditioners, additives, inhibitors and anti-freeze fl uids can
be used only if manufacturer guarantees they are suitable
for use in heating systems and they do not cause damage
to heat exchanger or other components and/or materials of
boiler and system.
Use of generic chemicals not specifi cally suitable for use in
heating systems and/or incompatible with boiler materials
and system is forbidden.
Conditioning chemicals must ensure complete deoxygenation
of water and contain specifi c protective agents for yellow
metals (copper and its alloys), anti-fouling agents for
limescale at least up to 150 ppm CaCO3, pH neutral
stabilizers and, in low temperature systems, specifi c biocides
for use in heating systems.
In systems with continuous intake of oxygen (e.g. fl oor
systems without anti-diffusion pipes, open expansion
vessels), or intermittent (e.g. in case of frequent
replenishing), a separator must be provided. Regarding
domestic hot water (DHW), no type of treatment which
could prevent its possible food use can be provided for.
WARNING
• Poison hazard. Ethylene glycol is toxic. Do not
use ethylene glycol.
• Never use automotive or standard glycol antifreeze,
even ethylene glycol made for hydronic systems.
• Ethylene glycol can attack gaskets and seals used
in hydronic systems.
• Use only inhibited propylene glycol solutions
certifi ed by fl uid manufacturer as acceptable for
use with closed water heating system.
• Thoroughly clean and fl ush any system that used
glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet
(MSDS) on fl uid used.
NOTICE
Do not expose boiler to freezing temperatures.
5.3 Special Conditions
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certifi ed by fl uid
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
• Boiler installed above radiation level (or as required by
authority having jurisdiction) shall have low water cutoff
protection.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation. Install
fl ow control valves or other automatic means to prevent
gravity circulation of boiler water during cooling cycle.
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