OJ ELECTRONICS USG5-4000 Power Module

Specifications

Product Usage Instructions

Heating Indicator
The LED on the faceplate indicates when the heater/relay is on, except in case of a GFCI error.

GFCI Checking
It is crucial to test the GFCI upon installation and monthly thereafter. Follow these steps:

1. Press the top button to test the GFCI relay.
2. The red light on the side will flash.
3. Press the side button to reset the GFCI.
4. The red LED will stop flashing, indicating normal operation.

LED States

• LED off: NORMAL
• LED flashing slowly: TRIGGERED
• LED flashing rapidly: ERROR (Turn power off and on again, check all wires)
• LED constantly reads: DEFECTIVE (Replace unit)

WARNINGS:

• To avoid electric shock, disconnect the heating system power supply at the main panel before performing installation and maintenance work on the power module.
• Keep the power module air vents clean and free from obstruction. This power module is an electrical device and must be installed in compliance with national and/or local electrical codes. Installation must be performed by qualified personnel where required by law.
• If a power module with an equipment ground fault protection device (EGFPD) is to be installed where national and/or local electrical codes require a ground fault circuit interrupter (GFCi), a separate GFCi must also be installed.

QUICK START

1. Loosen the screw at the bottom and remove the faceplate. Do not attempt to remove the screw completely.
2. Turn the power source OFF at the breaker panel. Make electrical connections to the power base. See Warnings. AWG between 12 and 20.
   Note! Do not detach the screws from the terminals. When tightening the screws, use a torque of between 0.8 and 1.2 Nm.
3. The signal cable must not come in contact with electrical wires in the wall and must be routed outside the electrical box. Thread the signal cable through the hole in the power base. Push the electrical wires to the back of the electrical box.
4. Push the power base into the electrical box. Secure the power base to the wall.
5. CAUTION
   If the primary and secondary relays are connected incorrectly, the secondary relay will be constantly pulled. The floor might overheat.
   Cable recommendations
   • The maximum distance between the thermostat and power module, or between successive power modules, is 80 ft (25 m). Use field wiring cable; 20 AWG is recommended in two different colors.
   • Only one wire can be connected to any one of the terminals A, B, C or D. Please ensure correct wiring.
   • Any number of power modules can be added to the system.
6. Remount the faceplate. Tighten the screw at the bottom.

Heating Indicator

The LED on the front of the faceplate indicates that the heater/relay is on, except in the event of a GFCI error.

States:

• OFF
  • No power to the unit
• White
  • Unit is powered on – no heat demand
  • If the LED is white whilst the thermostat is calling for heat, one or both of the wires are not connected properly.
• Amber
  • Heat demand from the thermostat – relay activated
  • When GFCI is triggered, the relay is deactivated. The LED still lights up amber if there is a heat demand.
  • If the LED is amber whilst the thermostat is not heating this may indicate that the wiring between the thermostat and the power module has been reversed.

Checking the GFCi

Upon installation, it is important to check the GFCI to ensure that it has been installed properly and functions as intended. This should be done once a month thereafter.

Note: During each power-up, the red GFCI LED on the right side of the unit will briefly light up without flashing.

To check the GFCi:

1. Push the top button to test the GFCi relay
2. The red light on the side flashes
3. Push the side button to reset the GFCi.
4. The red LED stops flashing
5. Normal operation continues.

GFCi LED states:

CLASSIFICATION

The product is a class II device (reinforced insulation) and must be connected to the following leads:

• Phase L1 (L) 120/208/240 V
• Neutral L2 (N)
• Max. load 15 A (resistive load)
• The power module is intended to be used with underfloor heating.
• The heating element must be rated according to the supply voltage.
• The terminals are suitable for field wiring cables of 12 to 20 AWG.
• The USG5-4000 has a built-in two-pole ground fault circuit interrupter (GFCi, Class A).
• The power module is designed for flush mounting into a wall socket.

CERTIFICATION
UL Listed for the US and Canada According to the following standards: UL 60730-1 / UL 60730-2-9 CAN/CSA E60730-1 / CAN/CSA-E60730-2-9 USG5-4000: UL 943 fourth ed. CSA C22.2 No.144.1-06

Disclaimer
OJ cannot be held liable for any errors in the material. OJ reserves the right to alter its products without notice. This also applies to products already on order, provided that such alterations can be made without requiring subsequent changes in specifications already agreed. The contents of this material may be subject to copyright and other intellectual property rights and is either the property of or used under license by OJ Electronics. The OJ trademark is a registered trademark of OJ Electronics A/S.

© 2021 OJ Electronics A/S

For support please contact your installer or retailer.

OJ Electronics
Stenager 13B DK-6400 Sønderborg

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This manual and parts thereof are protected under Danish and international copyright laws.

FAQ

Q: What should I do if the LED is constantly lit?
A: If the LED is constantly lit, it indicates a defective unit. Please replace the unit.

Q: How often should I test the GFCI?
A: It is recommended to test the GFCI once a month to ensure proper functionality.

Documents / Resources

OJ ELECTRONICS USG5-4000 Power Module [pdf] User Guide USG5-POWER-MODULE, USG5-4000 Power Module, USG5-4000, Power Module, Module

References

• User Manual