Unigas RX90 Installation Manual page 55

Key
A limit contact switch for damper OPEN position
AI block remote signal
AR main relay (working network) with contacts "ar"
AS Monitor fuse
BR block relay with "br" contacts
BV fuel valve
EK reset button
FE detector electrode of ionisation circuit
FR flame relay with "fr" contacts
G ventilator motor or burner motor
GP gas pressure switch
H main interruptor switch
L block stoppage LED
LK air damper
LP air pressostat
LR safety regulator
M auxiliary contact switch for damper "MIN" position
QRA UV detector
QRE ignition spark detector
R thermostat or pressostat
S fuse
SA damper servo-motor
SM synchronous programmer motor
V flame signal amplifier
V in case of servo-motor: auxiliary contact for response to fuel
valve with regard of damper position
W safety pressostat or thermostat
Z ignition transformer
Z in case of servomotor: end of limit contact switch for damper
CLOSED position
ZBV pilot burner fuel valve
° for mono-tube burners
°° for twin-tube burners
(1) input for raising QRA detector voltage to test level
(2) input for excitation of flame relay during flame detector test
circuit (contact XIV) and during safety time (contact IV)
(3) Do not press EK for more than 10 seconds
Programmer diagram
t1 pre-ventilation time
t2 safety time
*t2 '1st safety time
t3 pre-ignition time
*t3 'pre-ignition time
t4 interval for creating current between terminals 18 and 19
*t4 'interval for creating current between terminals 17 and 19
t5 interval for creating current between terminals 19 and 20
t6 post-ventilation time
t7 interval between startup consent and current created at
terminal 7
t8 duration of start-up
*t9 2nd safety time
t10 interval before air pressure monitoring begins
t11 damper opening travel time
t12 damper closure travel time
t13 permissible post-combustion time
t16 initial delay of damper OPEN response
t20 interval before programmer automatically stops
* These times are valid with the use of a series 01 safety device for moni-
toring burners with intermittent pilot lighter.