Honeywell
Heating & Cooling Appliance Controls
Title: Functional description
S4965A3025
Doc.:
S4965A3025E20
Description Sign.
E.C.N.
Date
Rev.
First issue
M.Matiasko
01-Sep-2015
A
Page
22/22
10.5 - Adjustments and final checkout
WARNING
Adjustments must be made by qualified persons only.
If the appliance manufacturer supplies checkout and/ or service and maintenance instructions carefully follow them.
If these instructions are not provided then use the procedure outlined below.
Checking flame current
The minimum value should be in accordance with specified value.
To check flame current connect a DC micro-Ampere meter between flame sensing wire and flame sensing rod.
Short micro-Ampere meter during ignition to prevent damage of the micro-Ampere meter in single rod applications.
Meter connections polluted with e.g. alkaline substances lying close to earth can cause flame current simulation.
Make sure no false flame current can flow from meter connections to earth.
As in normal operation the flame current is measured during 50 % of the time, the read out value is half of the real
value. The read out value has to be multiplied by 2 to get the real value.
If flame current is insufficient check that the flame sensing rod is fully enveloped by the flame and that the burner
and the boiler control are reliable grounded.
Final checkout
After installation and any adjustment start the appliance and observe a complete cycle to ensure that all burner components
function correctly.
Maintenance and service
Under normal circumstances, no maintenance or service is required.
10.6 - EMC guidelines
The position of the ignition cable has to be determined for lowest emission. In general conduct ignition cable along
metal pipes or shield metal for lowest loop area
Do not lead ignition cable close to other cabling.
To suppress Radio Frequency Interference (RFI) the boiler control including spark ignition cable should be mounted
in sufficient shielded environment.
High frequency radiated emission can be reduced by a 1k spark ignition plug.
Do not lead flame cable close to other cabling.
Do not lead DC fan commutation cable close to other cabling.
Keep high voltage spark wire at least 10 cm away from other wires.
