Honeywell R4795A Manual page 5

IMPORTANT: Do not run high voltage ignition trans-
former wires in the same conduit with the flame
detector wiring.
5. For ignition installations in a contaminating environ-
ment, use Honeywell Specification no. R1239001 High Ten-
sion Ignition Cable or equivalent. This wire is very resistant
to severe conditions of oil, heat, and corona, and is tested to
withstand high voltages up to 25,000V rms in a salt bath for
one minute without breakdown. It is rated at 200°F (93°C)
for continuous duty and up to 350°F (75°C) for intermittent
use.
Wiring Hookups
The typical wiring hookups in Fig. 2 and 3 show the
internal line voltage schematic. Contact 3K2 closes when the
controller calls for heat. 1K4 closes when prepurge is com-
plete. 2K2 breaks and 2K3 makes when flame is proven.
Also see the Operation section.
Fig. 2—Wiring hookup of gas system with
interrupted ignition and intermittent pilot.
BURNER
8
MOTOR
AIR FLOW
7
SWITCH
6
1K4
F
TO FLAME
DETECTOR
FLAME
(FLAME ROD
AMPLIFIER
OR UV
G
DETECTOR)
R4795A
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FOR INTERMITTENT IGNITION, CONNECT IGNITION TO TERMINAL 3.
3
REFER TO SPECIFICATIONS SECTION FOR RECOMMENDED LIMITS.
MAIN FUEL
5
VALVE(S)
2K3
2
4
IGNITION
2K2
PILOT
3
VALVE
3K2
1
CONTROLLER
2
3
LIMIT(S)
1
L1
L2
(HOT)
M8682
Fig. 3—Wiring hookup of oil system with
interrupted ignition.
BURNER
8
MOTOR
AIR FLOW
7
SWITCH
6
F
TO FLAME
FLAME
DETECTOR
AMPLIFIER
(PHOTOCELL
G
OR UV)
R4795A
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
FOR INTERMITTENT IGNITION,CONNECT IGNITION TO TERMINAL 3.
3
IMMEDIATE OPENING OIL VALVE V4046B.
4
OPTIONAL DELAYED OPENING OIL VALVE V4046A OR V4046B WITH
ST70A ELECTRONIC TIME DELAY.
5
REFER TO SPECIFICATIONS SECTION FOR RECOMMENDED LIMITS.
Retrofitting R4795
CAUTION
Make wiring connections as specified in Fig. 2, 3,
or 4. Do not simply plug the R4795 into the old
subbase without first changing the wiring at the
subbase.
Observe the following when retrofitting the R4795:
1. Requires a line voltage controller capable of switching
the entire connected electrical load.
2. Delayed opening oil valve may be retained but its
delay is not necessary. Integral ST71A Purge Timer meets
the intent of a delayed opening valve.
3. Refer to Fig. 2, 3 or 4 for proper wiring connections.
5
INSTALLATION
4
2ND STAGE
5
OIL VALVE(S)
2K3
2
4
IGNITION
2K2
3
1ST STAGE
3
OIL VALVE(S)
1K4
3K2
1
CONTROLLER
2
5
LIMIT(S)
1
L1
L2
(HOT)
M8683
60-2285—7
R4795A