Preferred JC-22D2 User Manual

SDI-JC-22D2 rev. 11-1-21 page 4 of 22
Standard Sequence
Sequence
Steps
Burner Flame Safeguard Sequence
(Typical)
JC-22D2 Draft Controller
Sequence
1. Shutdown Operating Limits, Fan and Fuel Valve
inputs = OFF
Fan Delay relay output = OFF
2. Fan Start
Delay
“Call for Heat “ Operating Limits make and
energize JC-22D2 term. 15.
Burner fan starts after JC-22D2 Fan Delay
relay energizes.
The JC-22D2 commands the outlet damper to start opening and
also starts the 15 sec. (adjustable.) When the timer expires, the
Fan Delay relay closes, which completes the Burner Limits input
which starts the Burner fan. By then the outlet damper should be
open enough to prevent pressurizing the furnace with the burner
fan running.
3. Purge When both burner and outlet damper
actuators limit switches make, the Purge
starts. When Purge is complete the burner
actuator returns to low fire for Ignition.
The outlet damper continues to fully open position. The outlet
damper remains wide open.
4. Release To
Modulate
Delay
Burner main flame trial period The outlet damper remains wide open. The 15-sec. (adjustable)
release to modulate timer holds the outlet damper wide open during
the flame safeguard main flame trial period and longer if desired.
5. Modulate Burner Modulates Outlet damper modulates when the JC-22D2 is in Auto.
In Manual the operator sets the damper position.
6. Post Purge No Call for Heat
(Operating Limits and Fuel Valve inputs =
OFF, Fan remains on for post-purge)
The JC-22D2 commands the outlet damper to wide open for post
purge.
7. Damper
Close Delay
Burner completes post-purge and stops
the Fan
(Operating Limits, Fan and Fuel Valve
inputs = OFF)
Cooldown Delay timer (0 seconds, field adjustable) starts. This
timer is typically only used with refractory lined furnaces that need
an extended cooldown period. It keeps the outlet damper open for
a time delay after the Fan stops. When this timer expires, if the JC-
22D2 is in AUTO, the outlet damper moves to the fully closed.
Fan Delay Relay Output
Terminals 9-10
Operating Limit Input
Terminal 15
Fan Starter Input
Terminal 8
Fuel Valve Input
Terminal 13
Outlet Damper
1 2 5 6 73 1
Shutdown
Fan Start
Delay
Purge
and
Ignition
Modulation
Delay
Modulate
Post-Purge
Damper Close
Delay
Shutdown
4
open
closed
on
off
on
off
on
off
on
off
Fan Start Delay
Cooldown
Delay
Draft Modulation Delay

Preferred JC-22D2 Specifications

General

Brand	Preferred
Model	JC-22D2
Category	Controller
Language	English