Wiring Connections Diagram - Beckett NX Manual

Wiring Connections Diagram

Explosion, Fire, Scald, and
Burn Hazard
All heating appliances must have HIGH
LIMIT protection to interrupt electrical
power and shutdown the burner if
operating or safety controls fail and
cause a runaway condition.
Follow the appliance manufacturer's wiring diagrams
and note all required safety controls.
Typical safety controls include high temperature or
pressure limits, low water cutoffs, pressure relief
valves and blocked fl ue sensing switches.
Verify all limit and safety controls are installed
and functioning correctly, as specifi ed by the
manufacturer, applicable safety standards, codes
and all authorities having jurisdiction.
Ensure that the appliance is free of oil and oil vapor
before starting or resetting the burner.
Refer to the appliance manufacturer's wiring diagram
prior to connecting the burner wiring. All wiring must be
in accordance with the latest revision of National Electric
Code NFPA 70 and all local codes and regulations.
The 7505 primary control with
valve-on delay (pre-time) and
burner motor-off delay (post-time) requires a constant
120 volts AC power source supplied to the BLACK wire
on the control. The RED wire goes to the appliance limit
circuit. Please note that other control manufacturers may
use different wire colors for power and limit connections.
○ Make connections to the control's terminals as
shown in Figures 7a and 7b. Refer to the label on
the underside of the control for wiring details.
Motor-off delay on a 7505P will be
disabled if the safety and operating
limits as shown in Figures 7a and 7b interrupt power to
the control terminal L1.
○ Connect thermostat leads to the TR and TW
terminals on the control or jumper the TR and TW
terminals on the control, as directed by the appliance
wiring diagram.
- Thermostat anticipator Current: 0.1 amp
- Thermostat voltage: 24 volts AC
NX Burner Manual
If the thermostat short cycles or
operates improperly, it may require
an isolation relay for proper operation. The Beckett
A/C Ready Kit (part no. 51950U) provides this function.
Wiring instructions are included with the A/C Ready Kit.
Figure 7a. – GeniSys 7505 Control interrupted
ignition, valve-on delay only (no motor-off delay)
L1
L2
SAFETY AND
OPERATING
LIMITS
IGNITER
MOTOR
OIL VALVE
CAD CELL
Figure 7b. – GeniSys 7505 Control Interrupted
ignition, valve-on delay and motor-off delay
L1
L2
SAFETY AND
OPERATING
LIMITS
IGNITER
MOTOR
OIL VALVE
CAD CELL
Section: Wire Burner
W
R
THERMOSTAT
IGNITER
L2 (IGN)
MOTOR
L2 (MTR)
LIMIT
L1
L1 - LIMIT
LIMIT
TR-TW
JUMPER
L2
VALVE TR
L2 (VLV)
TW
CAD TR-TW TERMINALS
LOCATED ON OPPOSITE
CELL
SIDE OF CONTROL
W
R
THERMOSTAT
IGNITER
L2 (IGN)
MOTOR
L2 (MTR)
L1
LIMIT
TR-TW
JUMPER
L2
TR
VALVE
L2 (VLV)
TW
CAD TR-TW TERMINALS
LOCATED ON OPPOSITE
CELL
SIDE OF CONTROL
11