Table of Contents
Advertisement
20
Fixed anticipator thermostats are not adjustable.
Adjustable anticipator thermostats, depending on thermostat
model, may be adjustable from a .18 to a .9 setting by moving
a pointer on the anticipator.
The higher the anticipator setting (towards .9) the longer it will
take for the thermostat to respond to a change in room tem-
perature. Too high a setting and the boiler will be slow to
respond to a temperature change in the room. This can cause
the room temperature to drop to an uncomfortable level before
the boiler starts. This may generate homeowner complaints.
Recent investigations of boilers which were installed in hard
water areas, revealed that mineral deposits had accumulated
at the bottom of the heat exchanger. In addition, sludge,
scale and other solid contaminants were present in boilers
installed in older systems or where the water was supplied
from a well. This accumulation creates an insulating layer
that drastically affects boiler efficiency by reducing the
transmission of heat through this primary transfer surface
and causes extreme metal temperatures that eventually
crack the heat exchanger.
THE TERMS OF THE BOILER WARRANTY WILL NOT
APPLY TO FAILURES ENCOUNTERED UNDER THESE
CIRCUMSTANCES.
The boiler warranty does not cover leaks resulting from
corrosion caused by the use of underfloor plastic tubing
without an oxygen diffusion barrier. Systems must have
the non-oxygen diffusion barrier tubing separated from the
APPENDIX C
Thermostat Heat Anticipator Settings
APPENDIX D
Accumulation of Foreign Deposits in Heat Exchanger
APPENDIX E
Use of non-oxygen diffusion barrier underfloor tubing
SLANT/FIN LTD/LTEE, 6450 Northam Drive, Mississauga, Ontario L4V 1H9
• Phone: (905) 677-8400 / FAX: (905) 677-1829 / Order Desk Fax: (905) 677-9015
www.slantfin.ca / E-mail: orderdesk@slantfin.ca / info@slantfin.ca
The lower the anticipator setting (toward .18) the faster the
thermostat will respond to a change in room temperature. Too
low a setting and the boiler will short cycle. Boiler short cycling
will cause unnecessary wear on the equipment and in the case
of oil boilers it can lead to poor combustion and more frequent
cleaning of the combustion area.
It is important to understand what the thermostat is controlling
and then determine the amp rating of that relay, gas valve,
zone valve or control. This information is usually stamped
somewhere on the component. A properly set anticipator will
allow the system to operate at its maximum effectiveness.
RECOMMENDATIONS:
On all installations in hard water areas:
1. The system should be thoroughly inspected for leaks which
must be repaired however minor they may be.
2. The initial water charge of the system must be treated to
reduce its hardness to an acceptable level.
In addition to the aforementioned, older systems and those
supplied from wells may require that a filter or strainer be incor-
porated in the circuit at some point on the return line closest to
the boiler. Suitable water treatment filters are commercially
available for this purpose.
WE STRONGLY RECOMMEND THAT YOU CONVEY THIS
VITAL INFORMATION TO ALL PARTIES CONCERNED.
boiler with a heat exchanger, Slant/Fin recommends the
use of underfloor plastic tubing with an oxygen diffusion
barrier. Other system components may also require
protection from oxygen permeation.
Sentinel
Hide quick links:
Advertisement
Table of Contents
