Potterton Derwent Compact Plus Installation, Operation & Maintenance Manual page 26

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
DERWENT COMPACT PLUS - CONDENSING
Rheostat
SECTION 6
PAGE 23
Safety burner thermostat
TSB
DGAI Burner control system
TF Flue thermostat
STB Overheat thermostat
Burner reset
ZSB
ZT Burner test switch
F1 Fuse
VSC Overheat indicator light
VSB Flame failure indicator light
MST Mains indicator light
TR Safety mode thermostat
1st stage control
TR1
thermostat
2nd stage control
TR2
thermostat
ZP Pump switch
ION Flame ionisation probe
L Live
Fil bleu Blue wire : neutral
Fil jaune/vert Yellow/green wire : earth
Gas pressure switch
P
Air pressure switch 1st stage
AP1
Air pressure switch 2nd stage
AP2
1st step indicator light
VMB1
2nd step indicator light
VMB2
Boiler pump
P-CH