For 070 and 075 units | Carrier 48/50P2, 48/50P4, 48/50P3 guide

f.Run the FR cable through the 1/2-in. connector of the MMV enclosure (do not tighten connector screws at this time). Connect black wire to MMV terminal 2 and red wire to MMV terminal 1, 13A, or 13C (see Table 4). Place 1 small varnish cloth 38C24601 around both cables at the point they enter the 1/2-in. connector. Tighten down connector screws being careful not to damage the cables.

8.Bundle excess wire and dress harnesses with wire ties.

9.Re-attach control box, MMV enclosure, and cable tray covers.

48/50P070-100 UNITS — For 48/50P070-075 units, two Motormaster controls are used to control two independent out- door-fan motors (OFM). The refrigerant circuit-A Motormas- ter® controlled OFM is the no. 3 OFM. The refrigerant circuit- B Motormaster controlled OFM is the no. 1 OFM (see Fig. 3). The no. 2 and 4 OFMs are controlled by the ComfortLink™ head pressure control routine.

For 48/50P090-100 units, the two Motormaster controls are used to control two independent outdoor-fan motors. The re- frigerant circuit-A Motormaster controlled OFM is the no. 6 OFM. The refrigerant circuit-B Motormaster controlled OFM is the no. 2 OFM (see Fig. 3). The no. 1, 3, 4, and 5 OFMs are controlled by the ComfortLink head pressure control routine.

Use the following procedure to mount and connect the MMV controllers to this unit:

1.Disconnect power to the unit. Lockout and tag power dis- connect.

2.Remove control box covers.

3.Remove fan decks to gain access to each circuit’s respec- tive Motormaster controlled OFM, as shown in Fig. 9 and 10.

4.Mount accessory fuse blocks HY11UT035 (label 1 as MMF-A and the other as MMF-B) and fan relay bases HN79KK035 (label 1 as FR-A and the other as FR-B) in- side control box as shown in Fig. 7. Secure components with ½-in. sheet metal screws.

a.Insert fuses into fuse blocks and relays into relay bases.

b.Install harnesses 48EJ402454 from load side of CCB (control circuit breaker terminals 21, 22, 23) to line side of MMF-A and MMF-B fuse blocks as shown in Fig. 11. Note that it may be easier to pickup the load side of CCB from the ¼-in. male quick connect terminals on the line side (terminals 11, 12, 13) of the OFC contactors (see power sche- matic on control box door).

c.For 070 and 075 units:

Connect FR-A coil to OFC3 coil and FR-B coil to OFC1 coil using the 72 in. long 16 gage white and gray wires (stripped end goes to FR) as shown in Fig. 11.

For 090 and 100 units:

Connect FR-A coil to OFC3 coil and FR-B coil to OFC2 coil using the 72 in. long 16 gage white and gray wires (stripped end goes to FR) as shown in Fig. 11.

5.Mount the MMV controller enclosures 30RA500381on the bulkhead, as shown in Fig. 9 (sizes 070 and 075) and Fig. 10. (sizes 090 and 100) using the mounting brackets 50EJ500656 installed on the enclosures (label 1 as MMV- A and the other as MMV-B). Remove the enclosure cov- ers and install the ½-in. HW60EA001 and 1-in. HW60HH006 connectors in the holes in the lower right hand side of the enclosures.

6.Connect transducers HK05ZZ001 to the liquid line ser- vice Schrader ports, located under the V-coils of the con- denser fan sections, of refrigerant circuit A and B. Circuit A is the one closest to the Indoor Fan Motor section, and circuit B is the one closest to the control box, (label cir- cuit A transducer as MMPT-A and circuit B transducer as MMPT-B).

7.Plug transducer cables 48EJ403240 into transducers (la- bel stripped end of circuit A cable as MMPT-A and the stripped end of circuit B cable as MMPT-B). Run cables along inside of unit base rail and up the corner post to the MMV enclosures, as shown in Fig. 9 and 10.

8.Run MMPT-A cable through 1/2-in. connector of MMV- A enclosure, and MMPT-B cable through 1/2-in. connec- tor of MMV-B enclosure (do not tighten connector screws at this time). Connect red, green, and black wires to MMV-A and MMV-B terminals 6, 5, and 2 as shown in Fig. 11. Terminate drain wire of transducer cables un- der one of the lower MMV mounting screws.

9.Make remaining electrical connections to MMV-A and MMV-B (see Fig. 11).

a.For 070 and 075 units:

In the main control box, disconnect black, red, blue, and green wires from load side (terminals 21, 22, 23) of OFC1 and OFC3 contactors (label cable from OFC1 as OFM1 and cable from OFC3 as OFM3). Pull wires out through the hole in the bot- tom of the control box and run them up the corner post to the opening of the cable tray on the side of the control box, as shown in Fig. 9. Run the cable through the wire tray to the MMV enclosures.

Run the OFM1 cable through the 1-in. connector of the MMV-B enclosure (do not tighten connector screws at this time). Remove ring terminals from black, red, and blue wires and strip insulation back 3/8-in. Connect black, red, and blue wires to MMV-B terminals T1, T2, and T3. Connect green ground wire to MMV-B ground screw.

Run OFM3 cable through 1-in. connector of MMV-A enclosure (do not tighten connector screws at this time). Remove ring terminals from black, red, and blue wires and strip insulation back 3/8-inch. Connect black, red, and blue wires to MMV-A terminals T1, T2, and T3. Connect green ground wire to MMV-B ground screw.

For 090 and 100 units:

In Main Control box, disconnect black, red, blue, and green wires from load side (terminals 21, 22,

23)of OFC2 and OFC3 contactors (label cable from OFC2 as OFM2 and cable from OFC3 as OFM3). Pull wires out through the hole in the bot- tom of the control box and run them up the corner post to the opening of the cable tray on the side of the control box, as shown in Fig. 10. Run the cable through the wire tray to the MMV enclosures.

Run the OFM2 cable through the 1-in. connector of the MMV-B enclosure (do not tighten connector screws at this time). Remove ring terminals from black, red, and blue wires and strip insulation back 3/8-in. Connect black, red, and blue wires to MMV- B terminals T1, T2, and T3. Connect green ground wire to MMV-B ground screw.

Run OFM6 cable through 1-in. connector of MMV-A enclosure (do not tighten connector screws at this time). Remove ring terminals from black, red, and blue wires and strip insulation back 3/8-in. Connect black, red, and blue wires to MMV-A terminals T1, T2, and T3. Connect green ground wire to MMV-B ground screw.

48/50P5030-100, 48/50P3, 48/50P2, 48/50P4 specifications

The Carrier 48/50P5030-100, 48/50P4, 48/50P3, and 48/50P2 series represent a range of highly efficient air conditioning and heating solutions developed by Carrier. Designed for commercial and industrial applications, these units combine advanced technology with robust features to deliver reliable performance and comfort.

One of the standout features of the Carrier 48/50P series is their energy efficiency. These units are equipped with high-efficiency compressors and fans that optimize energy use while maintaining superior cooling and heating capabilities. The models often meet or exceed ASHRAE efficiency standards, providing significant energy savings over traditional systems. This makes them not only cost-effective over their lifespan but also a responsible choice for energy-conscious businesses.

The 48/50P5030-100 model is notable for its ability to deliver precise temperature control, thanks to its sophisticated microprocessor control panel. This control system allows for easy adjustments and provides valuable diagnostic information, ensuring operational reliability and maintenance efficiency. The advanced controls also support variable-speed technology, which adjusts the system’s output based on real-time demands, enhancing both comfort and energy savings.

In terms of construction, these units are designed for durability. With a rugged, weather-resistant cabinet and high-quality components, they can withstand harsh environmental conditions, making them suitable for a variety of settings. The units typically include high-efficiency filters that improve indoor air quality by reducing airborne particles and allergens.

Another key characteristic of the Carrier 48/50P series is their versatility. These units can be configured for various applications, including rooftop installations and ground-mounted setups. Their modular design allows for easy integration into existing systems, accommodating different space requirements while providing optimal performance.

Carrier also emphasizes noise reduction in the design of these units, incorporating sound-dampening technologies that minimize operational noise. This is particularly valuable in environments where quiet operation is essential, such as schools and offices.

Overall, the Carrier 48/50P5030-100, 48/50P4, 48/50P3, and 48/50P2 series represent a commitment to quality, efficiency, and innovation in climate control solutions. With their advanced features, energy-saving technologies, and robust design, these models are well-suited to meet the diverse needs of modern commercial and industrial facilities. Carrier continues to lead the industry by integrating cutting-edge technology with a focus on performance and sustainability, ensuring that their systems provide long-term comfort and efficiency.