Specifications

Alarm output: 1 A max, 240 Vac max., 50/60 Hz, SPDT (form C) relay output configured for "fail-safe" operation.

Approvals: CSA "C" - "US" for ordinary locations.

Enclosure: Nema 4, grey painted steel with clips.

Indicator light: Nema 4 multi-function three color LED.

Input voltage range: 208, 480 or 600 Vac, 50/60 Hz, 3-phase / 4-wire as specified.

Monitoring and alarming: The electronics monitor low temperature, ground fault current, open / shorted temperature sensor(s) and high cable temperature.

Operating ambient: -40 to +40°C (-40 to +104°F).

Power output: 3-pole contactor output rated 60 A - 600 Vac.

Terminal blocks:

Valid temperature range: -40 to +100°C (-40 to +212°F).

Factory programmable:

Note: You can use the default settings of the following features by seleccioneing the appropriate program code as shown in tables 5 and 6 (program codes are listed here).

Auto-cycle : When the temperature controller is energised, and then at 24 hours intervals, the controller performs an auto-cycle test by turning on the load to measure the ground fault leakage current. If the measured ground fault current is above the set level, the ground fault current alarm is activated. Can be disabled at the factory upon special request.

Ground fault detection : Factory adjustable to trip and alarm or alarm only. Setting @ 30 or 100 ma.

Remote override : The user may force the unit on/off via a remote dry contact. Factory adjustable to operate in timed (1-48 hours) or continuous mode.

Temperature control : three 3-wire 100 W @ 0°C Platinum RTD (alpha=0,00385 W/W/°C), lead compensated to 20 W per lead. or three 2-wire 2 252 W @ 25°C NTC Thermistor.

Deadband : 1 to 5°C (1.8 to 9°F).

Control temperature setpoint range : -5 to 75°C (23 to 167°F).

Low temperature alarm : Feature can be enabled to provide low temperature alarm on TS1 and TS2.

Low temperature setpoint range : -10 to 75°C (14 to 167°F).

High cable temperature : The third temperature sensor (referred to as TS3) is used as a high cable temperature limit for plastic piping system protection. When TS3 is enabled, the high limit feature will override demand for heat and shut off the load when a high cable temperature condition is reached.

High temperature setpoint range : 25 to +100°C (77 to +212°F).

Installation:

• The wide ambient operating temperature range of the temperature controller allows installation in any convenient location. Considerations should include exposure to weather elements and accessibility for maintenance and testing.
• Backplate should be removed from the enclosure before any holes are drilled or cut to prevent damage due to flying debris.
• Conduit/cable entries should be made on the bottom of the enclosure to reduce the possibility of water entry. Avoid having holes drilled on the sides adjacent to the electronic components.

Wiring:

• A wiring diagram for the controllers is shown here.
• Use only 90°C rated power cable.
• Use shielded, twisted, three-conductor wire for the extension of the RTD leads.
• Use shielded, twisted, two-conductor wire for the extension of the thermistor leads.
• Grounding terminals are provided for connection of system ground leads. Proper system grounding is required for safe and correct operation of the controller's protection feature.
• Shields on the temperature sensor wiring should be grounded only at the controller end using the appropriate terminals provided (# 4, 8 and 15).
• To minimize the risk of damages to the controller due to a cable fault, the integrity of the heating cable should be verified by:
  • Performing a high voltage insulation test.
  • Measuring the load resistance with an ohmmeter.
  • In both cases, the results should be recorded for future reference.
    (refer to Urecon's commissioning log).

Temperature sensor location:

• Install the temperature sensor(s) on the pipe wall and cover with aluminum foil tape to enhance heat transfer.
• The controlling sensor(s) is (are) to be taped directly to the pipe wall, 180° away from the heating cable.
• The controlling sensor(s) TS1 and TS2 (when enabled) should be located at the expected coldest point(s) of the piping system.
• If controlling a pipe which enters a heated building, the sensor(s) must be located at least 3m (10 ft) away from the outside wall to avoid inaccurate temperature sensing.
• The high cable temperature sensor (TS3) is to be taped to an active heating zone of the heating cable (not to the cold lead) within the heat trace channel.
• Loop resistance should not exceed 40 ohms.
• Verify that the temperature sensor(s) is(are) wired correctly. Refer to the wiring diagram here.