Operating instructions
THERMOSTAT
LOW WATER
n
HONEYWELL PA 404A
CUTOFF PRESSURE LIMIT
CONTROL
IGNITION-
TRANSFORMER
HOT
1
LlNE
'
I
NEUTRAL
E$go'S:D
SWITCH
I I
,
I,(/I IMC
UtLAT
VALVE
HONEYWELL R8184
PRIMARY CONTROL
'
1
.,-...a-
,.-.
...
=
0
-
;
W-
VO
-
Fig.
11
?o
TFOI.
FO
OIL BURNER
SEQUENCE OF OPERATION
When the thermostat calls for heat, it energizes the cad cell protectorelay, bringing on the burner. The burner
will
operate until the thermostat is satisfied or the limit setting on ,the high limit is reached. When the high limit control
restores the circuit on a drop in pressure, the burner will start if the thermostat is still calling for heat. The low water
cut-off will stop the burner if the water level in the boiler drops too low.
On burner start, if the cad cell does not see flame within approximately
45
seconds, protectorelay will lock out on safety
and must be reset before burner can be restarted.
No.
1
Wiring
Diagram
for
Steam
Boilers
Less
Heater
TRANSFORM
IMMERSION
OPERATING CONTROL
OIL BURNER
SEQUENCE OF OPERATION
When the thermostat calls for heat, it energizes the cad cell protectorelay, bringing on the burner. The burner will oper-
ate until the thermostat is satisfied or the limit setting on the high limit is reached. When the high limit control re-
stores the circuit on a drop in pressure, the burner will start if the thermostat is still calling for heat. The low water
cut-off will stop the burner if the water level in the boiler drops too low.
On burner start, if the cad cell does not see flame within approximately
45
seconds, protectorelay will lock out on safety
and must be reset before burner can be restarted.
When there is no demand for heat, the operating con,trol will maintain the boiler water temperature at the selected setting
for the proper operation of the domestic water heater.
HONEYWELL PA 404A THERMOSTAT
PRESSURE LIMIT
CONTROL
LOW WATER
CUTOFF
Fig.
12
-
HOT
-
-
0
-
LlNE
I
NEUTRAL
E~~oS<O
SWITCH
I
I
b
Q?
No.
2
Wiring
Diagram
for
Steam
Boilers
with
Tankless
Heater
10