Cable Requirements 3.3.1 Line Power Supply

ROBERTS GORDON® ULTRAVAC™ CONTROLLER INSTALLATION MANUAL

3.3Cable Requirements: 3.3.1 Line Power Supply:

As per individual building specification for class of cable to be used. Use copper conductors only. To size the cable, use the amperages of the burners given on Page 13, Section 3.4.1, for each individual zone.

3.3.2 Control Wiring

All control wiring (sensor, VFD control (0 - 10 Vdc), pressure switch and RS-485 communication wiring) may be plenum or non-plenum rated depending on installation requirements, consult the National Elec- tric Code® (NEC). Regardless of the code or its inter- pretation, the local Fire Marshall makes the final decision, contact the local Fire Marshall if you have questions.

Do not run control (low voltage) wiring together with power (line voltage) wiring in the same conduit. Electrical signal interference or induced current could occur and cause communication problems.

VFD (0-10 V) control wiring and all RS-485 com- munication wiring must be shielded. Shielded wire provides noise and interference isolation and reduces the possibility of communication problems.

Pressure switch wiring is not required to be shielded. If electrical interference from machinery or other sources cannot be avoided, shielded wire must be used. All control cable specification diagrams shown will refer to shielded cable.

3.3.3 Indoor Sensor Cable:

Shielded cable (four twisted pairs of stranded 24 AWG min. wire) is required for use with indoor sensors. See Page 12, Figure 5 for an illustration of the shielded cable specification to be used. See Page 12, Section 3.3.2 to see if unshielded cable may be used.

Unshielded Cable: AMP #57248, #219538, #219513; Belden # 1585A, #1583A;

General Cable #C6015 or equivalent. Shielded Cable:

Madison Cable #08CFJ10001, #08CFJ00004; Belden #9681;

General Cable #2131673, #C1676 or equivalent.

FIGURE 5: Indoor Sensor Cable Detail

Insulation

Shield Wire

Foil	24 AWG
Shield	Minimum

3.3.4Outdoor Air Sensor VFD (0-10 V) signal, Pressure Switch Cable and PC RS-485 converter wiring:

Shielded cable (one twisted pair of 22 AWG min. wire) is required for the outdoor air sensor, VFD signal wiring, pressure switch wiring and RS-485 con- verter wiring between controller #1 and PC (RS-485 converter wiring to PC is only used if controller is using an RS-485 Converter Communication Package). See Page 12, Figure 6 for an illustration of the cable specification to be used. Shielded Cable: Belden #8451, #1503A, #8760; General Cable #C2514 or equivalent.

FIGURE 6: Outdoor Sensor, VFD (0-10 V) Signal, RS-485 Communications Cable and Pressure Switch Cable Detail

Uninsulated

Shield Wire

Insulation

Foil	22 AWG Minimum
Shield	conductor

22 AWG Minimum

conductor

3.3.5RS-485 Communication Wire Between Controllers:

Shielded cable (one twisted triad or two twisted pairs of 22 AWG min. wire) is required for RS-485 commu- nications between controllers. See Page 12, Figure 6 for an illustration of the shielded cable specification to be used. Shielded Cable: Belden #1902, #8770 General Cable #C1670 or equivalent.

NEMA 4 specifications

The Roberts Gordon NEMA 4 is a leading example of industrial heating technology, specifically designed for demanding environments. Known for its ruggedness and efficiency, it meets the needs of various industries, including manufacturing, warehousing, and food processing. The robust design ensures that it can operate efficiently in harsh conditions, making it a popular choice for facilities where moisture, dust, and other contaminants are common.

One of the standout features of the Roberts Gordon NEMA 4 is its weatherproof and dust-tight enclosure, which adheres to the NEMA 4 classification. This means that the unit can withstand water splashes and rain, making it suitable for outdoor installations or areas where water exposure is likely. The housing is constructed from durable materials that resist corrosion, ensuring longevity and reliability.

In terms of technology, the Roberts Gordon NEMA 4 utilizes advanced infrared heating, which provides direct and efficient heat transfer. This type of heating warms objects and surfaces rather than the surrounding air, allowing for faster heat-up times and enhanced energy efficiency. The units are equipped with high-output infrared emitters, which are designed to maximize radiant heat output while minimizing energy consumption.

The operational characteristics of the Roberts Gordon NEMA 4 are also noteworthy. The units are designed to be user-friendly, featuring intuitive controls that allow for easy temperature adjustments and monitoring. Furthermore, they come equipped with automatic safety features, including over-temperature protection and fail-safe shutdown mechanisms, which enhance operational safety.

Another advantage of the Roberts Gordon NEMA 4 is its versatility. It can be configured for various applications, including ceiling-mounted installations or wall-mounted setups, depending on the specific heating needs of a facility. This adaptability allows for efficient space utilization in warehouses and production areas.

The energy efficiency of the Roberts Gordon NEMA 4 translates into cost savings for businesses. By providing targeted heating where it is needed most, the units help reduce overall energy expenditures. Additionally, the longevity of the unit minimizes the frequency of replacements, contributing to long-term value.

In summary, the Roberts Gordon NEMA 4 is a highly effective industrial heating solution characterized by its robust design, advanced infrared technology, versatility, and energy efficiency. It is well-suited for challenging environments and has been embraced by industries that demand reliable and efficient heating solutions.