Operation

T-pack1 package

Includes a low pressure switch, low pressure bypass timer (described above) and fan cycle control.

Fan Cycle Control—Condenser Fan Cycling Control; allows the InteleCool2 unit to provide cooling to the space when the outdoor ambient temperature is lower than 50°F (10°C) and down to -20°F (-28.9°C). The control uses a reverse acting pressure switch mounted on the discharge line that cycles the condenser fan in response to the discharge pressure. On a call for cooling, when the discharge pressure increases to 250 PSIG (1723 kPa), the switch will close and start the condenser fan. When the pressure drips below 170 PSIG (1172 kPa) the switch will open and stop the condenser fan. Dur- ing low outdoor temperatures, the pressure switch cycles the condenser fan to maintain discharge pressure that will allow the system to function.

NOTE

During normal operation in low ambient conditions, the condenser fan will cycle frequently.

T-pack2 package

Includes a low pressure switch, low pressure bypass timer and an adjustable fan cycle control. See descriptions above.

5.4.4Anti-Short Cycle Timer - Standard

The anti-short cycle timer protects the compressor from continuous ON-OFF operation and restarts after momentary power failures. The timer used is adjustable and is set to a minimum of 3 minutes. On start-up, or any call for cooling after an off cycle of more than 3 minutes, the compressor will start immediately.

5.4.5Heater Protection - With Optional Heat

On units supplied with resistance heating, an auto reset heater safety and a one time (replaceable) thermal link protects the unit wiring and prevents excessive heat conditions caused by a dirty air fil- ter or fan failure.

5.4.6Lockout Relay - Optional

The lockout relay latches the detection of a high-pressure condition in the refrigeration circuit and prohibits operation of the compressor until the abnormal pressure conditions are acknowledged. The lockout relay is reset by cycling the unit main power or by changing the setpoint on the thermostat to temporarily eliminate a call for cooling. A normally open set of contacts is provided to terminals 2 and 3 of the customer terminal strip for monitoring the status of the lock out relay when this option is sup- plied without the Common Alarm option.

5.4.7Common Alarm - Optional

Alarm components are an evaporator air sail switch, evaporator high temperature switch, control relays and an adjustable time delay relay with two normally open and two normally closed alarm con- tacts. The alarm contacts will activate in the event of a loss of airflow across the evaporator blower, high evaporator temperature or in the event that the compressor is not functioning due to an abnor- mal pressure condition. The adjustable time delay relay can be adjusted for a delay of up to 90 sec- onds to eliminate nuisance tripping of the alarm contacts. To detect low pressure, the optional low pressure switch with bypass, T-pack1 or T-pack2 must also be selected.

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Emerson user manual Pack1 package, Pack2 package, Anti-Short Cycle Timer Standard, Heater Protection With Optional Heat

2 specifications

Emerson 2 is an advanced automation and control technologies platform designed to enhance operational efficiencies across various industries. This next-generation system builds upon its predecessor, incorporating cutting-edge technologies that facilitate seamless integration and data-driven decision-making.

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