(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.
Summary of Contents for HR93A
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