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Each desk control relay requires approximately 10 VA of
power•
Terminal numbers are marked on the desk control relay.
Desk control relay
• If PTAC/PTHP is 265 volt, see "Make Electrical Connections
265 Volt Power Supply."
• Determine whether PTAC/PTHP is equipped with standard or
remote thermostat controls, and see the appropriate section•
Standard Controls (no remote wall thermostat installed)
1. Disconnect power•
2. Remove the ribbed power cord lead from the L2 terminal on
the unit switch, and connect it to terminal #2 on the desk
control relay.
3. Connect the black wire, included with the desk control kit, to
the L2 terminal on the unit switch and to terminal #1 on the
desk control relay.
4. Remove the smooth power cord lead from the L1 terminal on
the unit switch, and connect it to terminal #5 on the desk
control relay.
5. Connect the white wire, included with the desk control kit, to
the L1 terminal on the unit switch and terminal #4 on the desk
control relay.
6. Remove and discard the hole plug in the bottom of the
control box next to the heat anticipator wires.
7. Run the harness wire ends with the quick connectors through
the hole and connect them to the coil terminals of the desk
control relay coil.
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1. White wire
2. Slack wire
8. Snap the strain relief bushing (provided) over the wire harness
and insert it into the hole in the control box. Be sure that there
is enough wire slack inside the control box to rotate the
control box fully opened.
Remote Thermostat Control (on some models) (remote
wall thermostat installed)
1. Disconnect power•
2. Remove the ribbed power cord lead from the 230 volt
terminal on the unit transformer, and connect it to terminal
#2 on the desk control relay.
3. Connect the black wire, included with the desk control kit, to
the 230 volt terminal on the unit transformer and terminal
#1 on the desk control relay.
4. Remove the smooth power cord lead from the COM terminal
on the unit transformer, and connect it to terminal #5 on the
desk control relay.
5. Connect the white wire, included with the desk control kit, to
the COM terminal on the unit transformer and terminal #4 on
the desk control relay.
6. Remove and discard the hole plug in the bottom of the
control box.
1 2
1. Thermostat bulb
2. Heat anticipator
3. Strain relief bushing
3 4 5 6
4.24 volt wire harness (supplied)
5.24 volt wires (field supplied) to front desk
6. Hole plug
1. Strain relief bushing
2. 24 volt wire harness
(supplied)
1 2 3 4
3.24 volt wires (field supplied) to front desk
4. Hole plug
35
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