User Manual

4
CONTROL WIRING
General
• All wiring should conform to the Naonal Electric Code and local
regulaons.
• The total electrical load must not exceed the maximum rang of the
control (see Specicaons).
• Use copper conductors only.
• Electrical leads should not be taut; allow slack for temperature
change and vibraon.
Input and Output Wiring
For typical wiring diagrams, refer to Figures 4, 5 and 6. All connecons
are made to the power (lower) circuit board. When using the 24V AC
powered models, the 24V AC input lines must enter through the
sidewall of the case. Refer to Figure 3 for locaon of the entry hole and
Figure 7 for wiring.
Analog Output
ETC models are available with an oponal 0 to 10 volt analog output.
This signal is a linear representaon of the sensor temperature with
0 volts = -30°F and 10 volts = 220°F. See gure 8 for wiring informaon
and Figure 3 for locaon of the entry hole. The reference for this output
is designated by the ”-” symbol on the wiring diagram. The output
signal is designated by the ”+” symbol.
Figure 3: Dimensions (in Inches)
CONTROL MOUNTING
Mount the ETC to a wall or any at surface using a combinaon of any
two or more of the sloed holes located on the back of the control
case. The control’s components are not posion sensive, but should
be mounted so that they can be easily wired and adjusted. Avoid
excessive condions of moisture, dirt, dust and corrosive atmosphere.
The ETC has provisions for 1/2 inch conduit connecons. The conduit
hub should be secured to the conduit before securing the hub to the
plasc housing of the control. When using the conduit entry in the rear
of the case, a standard plug should be inserted into the conduit hole
in the boom. Cauon should be exercised not to damage the control
circuit board or wiring when installing a conduit connector.
ANTI-SHORT CYCLE COMPRESSOR DELAY
When the unit is congured for cooling and there is a call for cooling,
the relay will not acvate unl the An-short Cycle Compressor
Delay is sased. During an An-short Cycle Compressor Delay, the
temperature will alternate with Cd (Cooling Delay) to indicate the Relay
On is delayed.