ACCESSORY REMOTE CONTROL PANEL Ð This central- station control can be set to override zone thermostat mode settings to lock out heating or cooling for the entire unit. The DAY/NIGHT switch and damper position knob provide in- space, central control of damper position. Panel also houses the ®lter light to indicate reduced air¯ow and need for clean ®lters. See Fig. 29. Install remote control panel in accor- dance with instructions shipped with this accessory.

Reheat Humidity Control Ð Control is achieved in any module by wiring a humidistat in parallel with the cool- ing thermostat. If zone thermostat drops below setting of heat- ing thermostat because the humidistat is closed (cooling coil is energized), the heating mode will be energized to reheat the air in order to maintain zone space temperature. A typi- cal humidistat hookup is shown in Fig. 30.

Optional Economizer Ð Adjust optional economizer as described in Optional Economizer section on page 42.

Optional Exhaust Damper Ð Adjust optional ex- haust damper as described in Optional Exhaust Damper sec- tion on page 42.

START-UP

After unit is installed, perform the following checks and procedures, and complete Start-Up Checklist on page CL-1.

Evaporator Fan Ð Fan belt and pulley are shipped at- tached to fan assembly. The factory-installed pulley pro- vides fan speeds as shown in Table 1. Adjust fan belt(s) as described in Evaporator Fans and Motor section on page 41. Also see Zone Air¯ow Adjustment section on page 38.

Compressor Rail Shipping Bolts Ð Loosen ship- ping bolts beneath compressor rails so that rails ¯oat freely. Do not loosen or remove bolts that attach compressors to rails.

Refrigerant Valves Ð Open compressor discharge serv- ice valve. Check that the suction service, hot gas shutoff, and the liquid line shutoff valves are also open. See Fig. 31.

Zone Module Gas Valves (48MA) Ð Each zone mod- ule has its own combination gas valve and pressure regula- tor to which gas is supplied by one of the 2 main manual gas valves (Fig. 32).

 

 

LEGEND

 

APS

Ð Air Pressure Switch

OR

Terminal (Circuit Board,

MCR Ð Master Cooling Relay

Field or Accessory Conn.)

 

MHR Ð Master Heating Relay

 

 

Accessory or Field Wiring

MUR

Ð Master Unit Relay

 

 

Factory Wiring

NC

Ð Normally Closed

 

NO

Ð Normally Open

 

Circuit Board Run

Fig. 29 Ð Remote Control Panel Accessory Connections

34

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Image 34
Carrier 48MA/50ME016-040 specifications Start-Up, Aps
Page 33 Page 35

48MA/50ME016-040 specifications

The Carrier 48MA/50ME016-040 series represents a significant advancement in the field of commercial HVAC systems, designed to provide reliable, efficient, and effective climate control solutions for various applications. These units are widely recognized for their durability and performance, making them a top choice for building owners and managers seeking optimal comfort and energy efficiency.

One of the main features of the Carrier 48MA/50ME series is its advanced scroll compressor technology. The scroll compressors are known for their reliability and efficiency, which leads to reduced energy consumption and lower operating costs. This high-efficiency design not only contributes to significant energy savings but also minimizes noise levels, enhancing the overall comfort of the environment.

The units are equipped with a unique microprocessor-based control system that offers precise temperature control and flexibility. This technology allows for easy integration with building management systems, enabling users to monitor and control their HVAC systems remotely, thereby optimizing performance and energy use. The programmable thermostats help to tailor the operation of the units to meet the specific needs of the users, ensuring maximum comfort at all times.

In addition to its robust performance features, the Carrier 48MA/50ME series also boasts a comprehensive line of options for customization. These options include various cooling capacities ranging from 16 to 40 tons, allowing the equipment to cater to different building sizes and requirements. The series is also designed with a compact footprint, making it suitable for rooftop installations where space is at a premium.

Another important characteristic of the series is its environmentally friendly refrigerant options. Carrier prioritizes the use of refrigerants with low global warming potential, contributing to a more sustainable approach to HVAC solutions. This commitment to environmental responsibility not only complies with regulations but also meets the increasing demand for greener technologies.

Furthermore, the robust construction of the Carrier 48MA/50ME series ensures long-lasting performance in even the harshest conditions. The units are designed to withstand various environmental factors, making them ideal for both commercial and industrial applications. Overall, the Carrier 48MA/50ME016-040 series stands out as a reliable choice for efficient and effective heating and cooling solutions, equipped with innovative technologies that prioritize performance, sustainability, and user comfort.
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