Honeywell S9371A - Manual (Page 3)

S9360A, S9361A, S9370A, S9371A INTEGRATED BOILER CONTROLLERS
3 69-2076—01
Table 1. Recommended Ignition Cables.
Transformer Requirement:
Add current ratings of module, pilot valve, main valve,
vent damper and any other components of the control
system to determine transformer size requirement.
Approvals:
Varies with control model.
ANSI Z21.20 Automatic Gas Ignition Systems and
Components.
ANSI Z21.23 Gas Appliance Thermostats.
EN298: Automatic Gas Burner Control Systems
ANSI Z21.87: Automatic Gas Shutoff Devices for Hot
Water Supply Systems.
UL353 Limit Controls.
PLANNING THE INSTALLATION
Automatic Ignition Control domestic and commercial
boiler systems are used on a wide variety of equipment.
Some of these applications may make heavy demands on
the controls, either because of frequent cycling, or
because of moisture, corrosive chemicals, dust or
excessive heat in the environment. In these situations,
special steps may be required to prevent nuisance
shutdowns and premature control failures. These
applications require Honeywell Engineering review;
contact your Honeywell Sales Representative for
assistance.
Frequent Cycling
These controls are designed for use on domestic and
commercial boiler systems that typically cycle less than
10,000 cycles per year. In an application with significantly
greater cycling rates, we recommend monthly checkout
because the controls may wear out more quickly.
Water or Steam Cleaning
Once a module or gas control has been wet, it may
operate unreliably and must be replaced. If the appliance
is likely to be cleaned with water or steam, the controls
and associated wiring should be covered so that water or
steam cannot reach them. The controls should be high
enough above the bottom of the cabinet so they will not
be subjected to flooding or splashing during normal
cleaning procedures. If necessary, shield the controls to
protect them from splashing water. A NEMA 4 enclosure
is recommended.
High Humidity or Dripping Water
Over time, dripping water or high ambient humidity can
create unwanted electrical paths on the module circuit
board, causing the module to fail. Never install an
appliance where water can drip on the controls.
In addition, high ambient humidity can cause the control
to corrode and finally fail.
Where the appliance may be installed in a humid
atmosphere, make sure air circulation around the module
and gas control is adequate to prevent condensation. It is
also important to regularly check out the system. A NEMA
4 enclosure may be needed.
Corrosive Chemicals
Corrosive chemicals can also attack the module and gas
control and eventually cause a failure. Where chemicals
may be used routinely for cleaning, make sure the
cleaning solution cannot reach the controls. Where
chemicals are likely to be suspended in the air, as in some
industrial and agricultural applications, protect the module
from exposure with a NEMA 4 enclosure.
Dust or Grease Accumulation
Heavy accumulation of dust or grease may cause the
controls to malfunction. Where dust or grease may be a
problem, provide covers for the module and gas control
that limit environmental contamination. A NEMA 4
enclosure is recommended for the module.
Heat
The controls can be damaged by excessively high
temperatures. Make sure the maximum ambient
temperature at the control locations will not exceed the
rating of the control. If the appliance normally operates at
very high temperatures, insulation, shielding, and air
circulation may be necessary to protect the controls.
Proper insulation or shielding should b provided by the
appliance manufacturer; make sure adequate air
circulation is maintained when the appliance is installed.
INSTALLATION AND CHECKOUT
When Installing This Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure they are suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Cable Type
Voltage
Rating (rms)
Temperature Rating
°C °F
UL Style
3217 10,000 150 302
UL Style
3257 10,000 250 484