Beckett CF2500 manual Standby, Cad Cell Resistance Measurement

Section: Wire the Burner

Figure 11 - Typical Burner Sequence of Operation - 7505

		1	Standby	9	Pump
					Prime
2		3		4
	Valve-on		Trial for
					Lockout
	Delay		Ignition

5

Ignition

Carryover

8		6		7
	Motor-Off
			Run
					Relight
	Delay

Table 4 - 7505 Flame Detection

Flame Detection Range

Normal = 0 to 1600 ohms

Limited = 1600 ohms to lockout

Cad Cell Resistance Measurement:

If the Beckett 7505 control is equipped with the GeniSys Display Module, part 52067U, the cad cell resistance can be selected and read on the LCD screen. Also, the GeniSys Contractor Tool, part 52082U, can be used for this purpose.

If these are not available, the cad cell leads can be unplugged from the control and the resistance measured with a meter in the conventional way. Conduct these tests with flame present.

Table 5 - 7505 Status Light Explanation Table

Light	On Continuously	Flashing
Color
Red	Restricted (Hard) Lockout	Soft Lockout
Green	Flame Sensed during normal	Recycle
	operation (Could be stray light
	during standby)
Yellow	Control is in Pump Prime mode	N/A
	or Reset button currently held
	for 15+ seconds.

Figure 12 - GeniSys 7505 Control with Optional Components

Reset Button	Wiring
	Connections
with Red Light
Yellow Light
Green Light

Cad Cell

Connections

Thermostat Terminals	Communication Port 2
	Communication Port 1

Optional Components:

Contractor’s Tool:

Hand-held device for

programming and diagnostics

Display Module: Permanent device for programming and diagnostics

Alarm Module:

For adding isolated low voltage alarm contacts to the base control. See Alarm Module Instructions for specifications.

CF2500/CF3500 Burner Manual 13