wiring a thermostat relay

Discussion in 'General Electronics Chat' started by rambosmyth, Apr 25, 2011.

  1. rambosmyth

    Thread Starter New Member

    Apr 25, 2011
    I am building a greenhouse which I purchased used. It came with a Schaefer Exhaust fan (1ph 230v 3p4w Magnatek Century model CS422 motor pn #8-194052-01, serial BU3-235) and controls consisting of a two-stage thermostat (Esapco T15-2) and a Square D class 8501 Type CO16 (16V20) series C relay.

    The t-stat is wired to an enclosure housing the relay. The stat has five wires, 2 - red leads (connected to relay terminals 4 and 1), 2 - black leads (connected to relay terminal 8 and one open lead to connect to ??) and 1 - green (connected to enclosure body).
    There is a red jumper off of relay terminal 4 that is open. There is a red open lead from relay terminal 6 as well.

    So basically I have three open leads as described and open/unused terminals on the relay nos. 2, 5, and 7.

    Based on SQD mfg literature the 16V20 indicates a 120 volt coil.

    I have a 4-wire cable being fed from a 2p 15a circuit breaker. The motor had been wired previously with a 14/3 romex that was still terminated in the wiring junction on the motor.

    can anyone help or point me in the right direction?

    Thank you!!
  2. BillB3857

    Senior Member

    Feb 28, 2009
    Here is the datasheet on the thermostat...... Not sure about the motor.