Cold slab, outdoor reset and temperature sensing prevent full boiler on – by adding a temporary
jumper between the lower W screw terminal and the upper left "E" tab, all temperature sensing functions
are bypassed and the control board will step in all the stages. Caution: This jumper shall not be a
permanent function, jumper needs to be removed after slab is approaching normal temperature.
Standby Switchover, SOT Timer
This plug-in option device allows a selection from 40 to 80 minute thermostat operating time for
automatic switchover to standby boiler. Order part number SOT-1.
Replacement Parts
WFSB
WFS25F
EB5623WO
UFUSE0440
4038KIT
5127
5535
5537
5453
5456A
5652
5650
EB5526
5541
10/22/2008
Water sensor, 3 ft.
Outdoor sensor (OT)
Controller, temp. sensing
2-amp fuse, fast blow (AGC2)
Triac switch module
Heating relay
Safety hi-limit, manual, 205°
First hi-limit, auto-reset, 185°
Relief valve, 30 PSIG
Gauge press/temp.
60A SQ D circuit breaker
30A SQ D circuit breaker
Electric element, 240, 5 kW
Transformer, 24V, 40VA
12
BI510