51
5. Hi-Limit Controller
The dryer utilizes six (6) channel controller (HLC-1) to monitor various locations on the dryer for over
temperature faults. The hi-limit controller enables the dryer to continually monitor up to six (6) Resistive
Temperature Devices (RTD's) at one time. Each channel is individual with set points. The hi-limit controller
scans each channel, and in the event of an alarm, the scanning will halt (stop), and the Single-Pole-Double-
Throw (SPDT) will change states signaling a fault. The hi-limit controller will remain in alarm until the reset
button is pushed and the temperature has fallen below the set-point temperature. The scan rate can be
adjusted from 4 to 12-seconds per channel.
• Channel #1 is used to monitor the exhaust for an over temperature situation.
• Channel #2 is used as an over burner monitor
(for Gas Models Only)
.
• Channel #3 is used to monitor intake temperature
(for Gas Models Only)
.
• The remaining channels are spares that can be used for future expansion.
a. Hi-Limit Controller Replacement
1) Discontinue electrical service to the dryer.
4) Disconnect the plug going to the hi-limit controller.
5) Remove the two (2) screws holding the mounting slides.
6) Remove the two (2) slides.
7) To install new hi-limit controller, reverse
Step #6 thru Step #2
.
8) Reestablish electrical service to the dryer.
2) Loosen the four (4) screws hold the hi-limit mounting
bracket.
3) Slide the mounting bracket off of the screws through the
keyhole.
H
I
-L
IMIT
C
ONTROLLER
T
EMPERATURE
S
PECIFICATIONS
G
AS
S
TEAM
ºF
ºC
H
I
-L
IMIT
N
AME
ºF
ºC
H
I
-L
IMIT
N
AME
RTD 1
225
107
Exhaust Temp. Limit
225
107
Exhaust Temp. Limit
RTD 2
200
93
Over Burner Temp.
650
343
Intake Temperature
RTD 3
650
343
Intake Temperature
500
260
N/A*
RTD 4
500
260
N/A*
500
260
N/A*
RTD 5
500
260
N/A*
500
260
N/A*
RTD 6
500
260
N/A*
500
260
N/A*
* Not applicable...controller channels
must be
set to 500º F (260 ºC).
Current
Production
Past
Production