53
Section C - Components, cont’d.
Two through Eight Wire Cables
The Bi-Metal, Analog and Comfort Control Center controls
require a 18 to 22 AWG cable for DC power and control of
various components. The cable can be two through eight
wires. This is supplied by the installer at the time of the
original installation.
If a problem is suspected in the cable, it should be checked
with an ohmmeter. Both ends of the cable must be discon-
nected from the control box and thermostat. Check conti-
nuity between all wires. If a continuity reading is present
the cable has a short (staple in cable) and it will require
repair.
Check each individual wire from each end of the cable for
continuity. No continuity shows the wire is open and needs
to be repaired or replaced.
Communication Type Cable
A flat communication type extension cable must be routed
from the unit to the Comfort Control Center. It must be 26
gauge, stranded copper wire, four (4) conductor (yellow,
green, red and black). The cable must be terminated with
a four (4) position (telephone) RJ-11 connector.
Note:
Do Not use a pre-made telephone extension cable.
The polarity of the connectors is reversed and will cause a
failure of the system.
The Cable assembly should be made in the following man-
ner: Cut the modular cable to the desired length. When
cutting, make sure ends are cut straight, not diagonally.
Next, use an RJ11 connector crimping tool.
Use the stripper section of the tool’s blade to remove the
outer insulation from each end of the cable. Be careful not
to remove or break the colored insulation on the inner con-
ductors.
Note:
Fully insert the cable into the stripper slot, holding
cable in one hand and tool in the other hand. Squeeze down
on tool and pull away. This will remove the correct amount
of outer insulation for insertion into RJ-11 modular plug.
Now you are ready to insert the prepared cable into the RJ-
11 modular plug. When inserting cable into plug, you
MUST
be sure that the black wire is on your left as you look at the
top of the plug (with the spring clip facing you) and that the
conductors are flush with the tip of the plug and touching
the small teeth-like gold conductors. Insert the RJ-11 modu-
lar plug with the cable into the tool’s cavity, squeeze down
to the STOP and hold for a few seconds. This completes
connections for one end of the cable. To prepare the other
end of the cable, repeat this procedure.
Note:
Be sure polarity is the same on each plug. Example:
Black on left (viewing plug from top, spring clip side).
FIG. C55
FIG. C56
Model 39224.601 (Air Conditioner)
The cable assembly is a five-wire assembly. The thermo-
stat end has a five-pin flat connector:
Pin 1 = Yellow Wire
Pin 2 = White Wire
Pin 3 = Orange Wire
Pin 4 = Blue Wire
Pin 5 = Black Wire
The unit end has a six-pin square connector.
Pin 1 = Yellow Wire
Pin 2 = White Wire
Pin 3 = Orange Wire
Pin 4 = Blue Wire
Pin 5 = Black Wire
To check the cable assembly, first unplug each end of the
cable assembly. Next, check for continuity on each wire
such as Pin 1 to Pin 1, etc. Continuity should be present
from Pin 1 to Pin 1, etc.
Next, check for continuity from one wire to each of the other
wires, such as Pin 1 to Pin 2; the Pin 1 to Pin 3, etc. No
continuity should be present from one wire to any other
wire in the assembly. Be sure to check each wire.
FIG. C57
Manual
Compliments
of
Northwest
RV
Supply
Printed
From
http://www.nwrvsupply.com
