Laars FT Series, Инструкция по установке и эксплуатации, Страница: 75 / 92

The FT Series Wall Mounted, Combination Boiler
Page 75
SECTION 9 Installation Check
9.1 Quick View
Before Installing
- Make sure that there is enough space for installing
Water and gas line.
Verify vent/air termination is located as required.
- All models need for propane Conversion which
requires a separate gas conversion manual.
Install Water Piping
- Boiler loop piping must be sized to the minimums
listed in the Boiler manual. Using smaller piping will
cause performance problems.(page 34)
Install Vent & Air Piping
- Slide the air inlet pipe and vent pipe into the Boiler
pipe connector.
- Make sure the terminations are placed as required
in the manual and that air intakes are at least 12
inches above normal snow line.
- Refer to the material check list in this guide for a list
of items needed.
Install Condensate Piping / Tubing & Components
- Fill out the material check list in this guide to
ensure you have the tubing or PVC pipe and all
components needed for the condensate piping.
- Connect internal components that are supplied with
the Boiler.
Install Gas Piping
- Install a union and shutoff valve.
Wire the Boiler
- Connect power wiring and control wiring per boiler
manual wiring diagram.(Section 4.19)
Start up, Adjust & Test
- Follow the Boiler manual instructions to clean
the system if needed, then fill and check water
chemistry.
Some items to consider are
• Consider the effects of reduced heat transfer and
an increase in head pressure against the system
circulator. For example: A 30% mixture of glycol will
result in a BTU output loss of 15% with a 5% increase
in head against the system circulator.
• Glycol mixtures should not exceed 50%. A 50%
mixture of glycol will result in a BTU output loss of
30% with a 50% increase in head against the system
circulator.
• The glycol solution should be tested as recommended
by the glycol manufacturer but not less than annually.
Some items of concern are pH additive breakdown,
inhibitor reduction, etc.
• Glycol/antifreeze solutions expand more than water;
therefore, system design must take this into account.
For example: a 50% by volume solution expands
4.8% in volume for a temperature increase from 32◦F
to 180◦F, while water expands 3% over the same
temperature rise.
Do NOT use automotive antifreeze or ethylene
glycol. Use only inhibited propylene glycol solutions
which are specially formulated for hydronic
systems. Ethylene glycol is toxic and can attack
gaskets, seals, and metallic components used in
hydronic systems. A correct glycol concentration
and inhibitor level is critical.
WARNING
CAUTION
It is highly recommended to follow the manufacturers
recommended concentrations, expansion requirements,
and maintenance recommendations. You must carefully
calculate the additional friction loss in the system as
well as the reduction in the heat transfer coefficients.
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Freeze Protection (continued)