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Tray heaters
General Information
The tray heater accessory is designed for heat pump units
with one and two compressors. The purpose of this acces-
sory is to prevent freezing of the water in the tray and the
formation of ice inside the outdoor coil. A flexible cable heater
is fitted between the bottom of the outdoor coil and the drain
tray. There are two connecting accessories: tray heater 1 for
units with one single compressor, and tray heater 2 related
to the board of the second compressor. These heaters are
enabled only if the following conditions arise:
Condition 1. The operating mode of the air conditioning unit
is in heat.
Condition 2. The compressor is in operation.
Condition 3. The temperature detected by the liquid probe
is below -2° C.
The heater is disconnected when the temperature detected
by the liquid probe is above -2° C.
Technical Specifications
This accessory includes the following components:
- Tray heater connecting board. If the unit is equipped with 2
compressors, two boards are provided; tray heater 1 and
tray 2.
- 300 mm. long cable for interconnecting the accessory
board. Accessory communication cable.
- Cable for connecting to 230 VAC of the heating cable.
- Heating cable, ref. AKO-71035 (35W/m).
- Fastening flanges.
Assembly
Install on the electric panel of the outdoor unit and fasten the
board of the accessory by means of the holes drilled next to
the electrical connections.
Installation
Install the tray heater accessory as follows:
1. Disconnect power supply to the outdoor unit.
2. Remove the control panel electrical connection covers
of the unit.
3. Remove the access covers to the outdoor unit coil.
4. Install the tray heater along the condenser within the
tray. Prevent the end protection and the connection from
being in contact with the tray of the unit (see installation
of the electric heater).
5. Avoid the cable for connecting to 230 VAC from being in
contact with the tray of the unit (see installation of the
electric heater).
6. Install the board of the accessory in the outdoor unit by
means of the holes drilled next to the electrical connec-
tions. Connect the hose cables to 230 VAC. Then connect
the operating cable provided, between connector J1 on
the auxiliary board A3 and connector J10 on the control
board A1 of the air conditioning unit (length of the cable
300 mm.). If the unit is equipped with 2 compressors,
connect to connector J2 or J8 on A2.
7. Re-establish power supply to the air conditioning unit.
8. To configure this accessory, press the test button on
control boar A1 for over 2 seconds, until the red LED on
the board goes on. Configuration will be completed once
this LED goes off.
9. Check operation of the accessory by selecting heat mode
on the ambient control thermostat of the air conditioning
unit. Have the outdoor fan go off so that the liquid probe
may detect a temperature of below -2° C and the tray
heater may be enabled. Once the temperature detected
by the liquid probe rises to over 2° C, the heater is turned
off.
10. Reassemble the air conditioning unit covers.
Note:
Should the system produce an incorrect response,
please see YKloon Board Technical Information.
General Dimensions mm.
Summary of Contents for SCOH-070K
Page 7: ...SCOH 090 and 120K General dimensions mm...
Page 8: ...SCOH 150K General dimensions mm...
Page 9: ...SCOH 180K General dimensions mm...
Page 10: ...10 SCOH 240 and 300K General dimensions mm...
Page 11: ...11 SICH 070 and 076B SICH 090 and 120B SICH 150B General dimensions mm...
Page 12: ...12 SICH 180B SICH 240B and 300B General dimensions mm...
Page 14: ...14 Variant chart...
Page 23: ...23 Wiring diagram SCOH 070K 076K 090K and 120K 400 3 50...
Page 24: ...24 Wiring diagram SCOH 120K 180K 240K and 300K 400 3 50...
Page 25: ...25 Wiring diagram SCOH 150K 180K 240K and 300K 400 3 50...
Page 26: ...26 Configuration of switches failures lock outs and incidents...
Page 30: ...30 Assembly and general dimensions mm SICH 240B to 300B...
Page 33: ...33 Wiring diagram Heater 10 15kW 400 3 50 SICH 070 to 180B...
Page 34: ...34 Wiring diagram Heater 20 30kW 400 3 50 SICH 090 to 300B...
Page 37: ...37 Location of the heater SICH 070 and 076B...
Page 38: ...38 Location of the heater SICH 090 to 300B...
Page 39: ...39 Wiring diagram Heater 10 15kW 400 3 50 SICH 070 and 076B...
Page 40: ...40 Wiring diagram Heater 20 30kW 400 3 50 SICH 090 to 300B...
Page 48: ...www johnsoncontrols com...