Contractors & Service Technicians

Loved by contractors, service technicians, and customers


Rawal APR Control:

An easier solution for all of your DX HVAC customers

Service Solutions

Keep your service customers comfortable and happy

 As a contractor or service technician, your goal is to build lasting relationships with your facilities customers. A poorly functioning, or disabled HVAC system decreases productivity, and your customer’s bottom line! Keep your customer (and their wallet!) happy by delivering an optimized system, within budget, with the APR Control!

  • Repair or modify existing in-place equipment
  • Reduce call-backs stemming from customer complaints 
  • Maintain lasting relationships with your service contract customers
APR Control helps all of your service customers

Modify any DX system to operate as a modulating variable capacity system

Rawal APR Control is a variable capacity enhancement for new and existing DX (direct expansion) systems in a wide range of commercial and industrial facilities and applications that helps provide:

  • Tight temperature control
  • Better humidity control
  • Improved high-percentage outside air
  • System protection (fewer call-backs)

Common HVAC Challenges

See below to learn more about how the APR Control is a solution for common customer complaints and the underlying causes.


High Humidity


Short Cycling

Outside air impact (Ventilation)


APR Control extends compressor runtime to keep the evaporator active

  • Coil Icing
  • Low entering air
  • Liquid slugging/ floodback

Low airflow from:

  • Improper ductwork
  • Dirty filters, plugged coils, bad belts (Deferred maintenance)

APR Control protects refrigeration circuits by maintaining saturated suction temperature (SST) above freezing


Temperature fluctuations in the space


Short cycling

Outside air impact


APR Control matches capacity to the changing load conditions in the space


Dissatisfied customers

  • Excessive downtime
  • Discomfort from high humidity & temperature swings
  • Frequent callbacks depleting budget

I think you know where this is going…

Request Sizing Assistance

Modulation enables consistent temperature and humidity

For Contractors

Flexible Solutions

Help HVAC systems respond to dynamic load criteria


Rehabilitate instead of replacing units in existing spaces

As much as 80% turndown on standard DX systems

The APR Control delivers true load-matching performance

Continuous dehumidification

Extend compressor run-time and maintain evaporator coil in dehumidifying mode

Draws lower power during modulation

APR Control unloads the compressor, reducing kW/hr

Shorter lead times

Deliver the right solution to your customer in less time

Standard HVAC equipment can be customized for special applications, especially with budget or lead time constraints

Eliminate the need for expensive customized equipment with long lead times

Applicable to a wide variety of systems and solutions:

Spaces with frequent load fluctuation such as schools, offices, and manufacturing facilities

VAV, VVT, make up air, and high percentage outside air applications

Value engineering option

Provide the right solution for your customer’s budget

Reduce up-front equipment costs

Provide variable capacity without use of expensive, complex technology

System protection for variable airflow volume (VAV) applications

APR Control allows for significant airflow reduction across the evaporator coil to provide optimal system performance

Systems with VFD on evaporator fan motors require APR Control to prevent compressor damage and provide consistent discharge air temperature

APR Control protects refrigeration circuit from coil freezing during low airflow operation

For Service Technicians

Complete problem jobs in less time

Service Technicians love the APR Control

Save warranty reserve funds and reduce call-backs

Technician friendly– simplify installation, start-up, and service

For Service Technicians

Correct over-sized equipment by adding APR

Improve designs to enhance performance

Eliminate inconvenient and excessive call-backs

Increase service pull-through work and sales

Provide a comfortable environment for your customer

Protect systems from missed preventive maintenance/service

Strengthen relationships with service / maintenance customers


Contractors & Service Technician Resources

Installing an APR Control on Your System

Rawal Devices only manufactures and sells the APR Control & APR-E Valve. We do not provide any other materials that will be needed for the installation.

Operational Description for APR Control

The APR Control® a capacity-control device that modulates a system’s air conditioning or refrigeration capacity to match variations occurring in the BTU quantity of the existing load

APR Control Selection Criteria

We are pleased to assist both new and long-term customers with selection of the best APR Control model (percentage of modulation) for their particular application.

  1. How to Sell The APR Control

The Rawal APR Control is a variable capacity enhancement to DX HVAC systems.

The dynamic nature of plant growth cycles and cultivation phases demands air conditioning units that can adapt to changing environmental requirements. These HVAC systems play a critical role in maintaining optimal temperature, humidity, and ventilation conditions to support healthy plant development and maximize crop yield.

Industrial manufacturing facilities experience fluctuating occupant loads, demanding robust and adaptable HVAC systems.

The dynamic nature of production processes and workforce activities necessitates air conditioning units capable of adjusting to changing operational demands.

Any commercial retail or office space faces the same challenge – too hot/too cold and too humid being the top complaints. These problems are often driven by varying occupancy across commercial office spaces with  some companies on a regular 5-day in the office schedule while others are on a varied schedule.

The controlled environments within these facilities demand meticulous temperature, humidity, and air quality management. Fluctuating activities, such as experiments or surgeries, necessitate adaptable air conditioning units to maintain optimal conditions.

Restaurants and diners contend with fluctuating occupant loads, demanding adaptable air conditioning (AC) and heat pump (HP) systems. The ebb and flow of customers throughout the day necessitates HVAC units capable of adjusting to changing occupancy levels.

The dynamic nature of healthcare institutions, with varying patient admissions and discharges, requires air conditioning units to constantly adapt to changing occupancy levels. This flexibility is crucial for maintaining a comfortable and healthy environment for patients, staff, and visitors.

Schools face challenges with systems serving classrooms, providing fresh air for a lot of people in a small space.

This often leads to high humidity and equipment failure.