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 11/22
5.3.4 - Low Voltage Connections
Connector
name
Pin Type of Connection Description
X3 1 Molex Microfit
Heat Demand (LV) switch input
X3 2 Molex Microfit
External Reset switch input
X3 3 Molex Microfit
Error Output (to Esys 2)
X3 4 Molex Microfit
High Limit switch input
X3 5 Molex Microfit
NC
X3 6 Molex Microfit
Alarm LED / GAS Error (to ELS*) [out]
X3 7 Molex Microfit
Error Input (from Esys 2)
X3 8 Molex Microfit
NC
X3 9 Molex Microfit
NC
X3 10 Molex Microfit
GAS Reset (from ELS*) [in]
X3 11 Molex Microfit
GND – External Reset switch
X3 12 Molex Microfit
High Limit switch – supply (24V)
X3 13 Molex Microfit
NC
X3 14 Molex Microfit
GND
X3 15 Molex Microfit
GND
X3 16 Molex Microfit
GND – (from Esys 2)
X3 17 Molex Microfit
GND – Heat Demand (LV) switch
X3 18 Molex Microfit
GND – (from ELS*)
NOTE: *ELS - External Lockout System / Switch
5.3.5 - Specification
Nominal data Value
Supply voltage 230 VAC +10%, -15%, 47 – 65 Hz
Power consumption 2,5 VA
Humidity 90% RH max at 40°C (no condensing)
Ambient temperature -20°C – +60°C
Communication Value
Bit rate 2400 or 19200 Baud
Byte format 1 start, 8 data, 1 stop, no parity
Bit value “1” low line level at connector
Bit value “0” high line level at connector