Wiring connections diagram, Nx burner manual – Beckett NX User Manual

Page 11

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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.

Section: Wire Burner

Wiring Connections Diagram

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

○

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.

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.

Explosion, Fire, Scald, and
Burn Hazard

SAFETY AND

OPERATING

LIMITS

LIMIT

L2 (VLV)

VALVE

MOTOR

L2 (MTR)

L2 (IGN)

IGNITER

CAD
CELL

MOTOR

IGNITER

OIL VALVE

CAD CELL

THERMOSTAT

TR-TW

JUMPER

TR-TW TERMINALS

LOCATED ON OPPOSITE

SIDE OF CONTROL

L1
L2

LIMIT

L1 - LIMIT

Figure 7a. – GeniSys 7505 Control interrupted
ignition, valve-on delay only (no motor-off delay)