ELECTRONIC CLIMATE CONTROL II
SERVICE MANUAL Part No’s. 00-00855-000 / 00-00856-000
Intellitec
1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
www.Intellitec.com
- 4 -
P/N 53-00855-856 Rev. C 080819
THE ECC CONTROL MODULE:
The control module performs the timing, sequencing, switching, and load shedding functions for the furnace/s, air
conditioner fans and compressors. It is often located under the refrigerator. The circuitry in this module decodes the
control signals sent to it via the multiplexed communication link, IPX, from the ECC Thermostat.
4
8
J1
J2
J3
J5
J7
1
5
J4
HE
A
T
AC
2
AC
2
AC
1
AC1
AU
X
3
HI-POT TEST
PWR UP
BYPASS
POWER
TEST SW
IPX IPX WIRING
FAULT OK FAULT
The control module includes three diagnostic LED’s for ease of servicing. These LED’s are located on the center of the
board, near the edge. They are labeled “IPX FAULT”, “IPX OK, and “WIRING FAULT”.
The control module operates the furnace/s by closing a set of relay contacts which are wired to the furnace. The relay
contacts for the front furnace are connected to pins 1 and 2 of connector J4, and the contacts for the rear furnace are
connected to pins 4 and 5 of the same connector.
The relay contacts are electrically isolated from all other circuitry on the Control Module. The contacts are functionally
equivalent to the contacts on a wall mounted thermostat and are wired to the blue and black thermostat leads from each
furnace. The coach may be equipped with one or two furnaces. On coaches equipped with one furnace, the furnace
should be wired to pins 1 and 2 of connector J4.
The pigtail connector supplied with the system (PC4) utilizes the following color codes:
PC4/J4 pin
FUNCTION
COLOR
1 FRONT
FURNACE
THERMOSTAT (BLUE)
WHT/BLUE
2
FRONT FURNACE THERMOSTAT (BLACK)
WHT/BLK
3
KEYED – NOT CONNECTED
4
REAR FURNACE THERMOSTAT (BLACK)
BLK
5
REAR FURNACE THERMOSTAT (BLUE)
BLU
The control module operates the air conditioner compressors and fans via three relays with 12 VDC coils supplied by the
A/C manufacturer and mounted in their equipment. The contacts on these relays are internally wired by the A/C
manufacturer to the 120 VAC supply line for each unit and connect the compressor with the low, or high speed taps on the
fan motor to that supply line when operated. The wiring between the Control Module and these relays is low voltage (12
