DDC controllers
Direct digital controllers that read sensor data and adjust plant, VAV and AHU equipment in real time.

Resco designs and installs HVAC controls in Pakistan, using DDC controllers to manage plant, VAV boxes and air handling units as part of a Honeywell-based building management system.
Overview
HVAC controls sit at the centre of a building automation system. Resco supplies DDC controllers and the plant, VAV and AHU controllers, valves, actuators, dampers and sensors that let a building management system read and adjust a building's heating, ventilation and air conditioning in real time.
These controls are designed to run on open protocols, so DDC controllers, plant equipment and dedicated outdoor air system (DOAS) equipment from different manufacturers can be integrated onto a single Honeywell Building Manager platform rather than operated as separate, disconnected systems.

Components
Scope depends on the building's existing mechanical plant and how much of it needs to be brought under automated control.
Direct digital controllers that read sensor data and adjust plant, VAV and AHU equipment in real time.
Control of variable air volume boxes and air handling units to manage airflow, temperature and ventilation.
Control of chillers, boilers, pumps and associated mechanical plant as part of the wider HVAC system.
Field devices that physically regulate flow and airflow in response to the control system.
Temperature, humidity and pressure sensors that feed real-time data back into the control loop.
Dedicated outdoor air system equipment integrated alongside conventional HVAC control.
Integration
Resco integrates HVAC controls with the building's wider BMS and other systems.
Principals
Resco supplies and integrates HVAC control equipment from these principals.



Across Pakistan
Resco delivers HVAC control projects from its head office in Karachi and regional offices in Lahore and Islamabad.
Karachi's commercial towers and industrial facilities across SITE, Korangi and Port Qasim give Resco's Karachi head office a wide mix of HVAC controls work, from central plant in high-rise towers to ventilation in industrial buildings.
1st Floor, Fasih Villas, Block-4,From its Gulberg office, Resco designs HVAC controls for commercial buildings and industrial estates around Lahore, matched to the mechanical plant already installed on each site.
Leeds Plaza, Main Boulevard,Resco's Islamabad regional office in Blue Area covers HVAC controls for government and institutional buildings in the capital and in Rawalpindi, scoped to each project's plant and requirements.
M-7, M. Gulistan Khan House 82-E,How Resco delivers
Resco follows a consistent delivery approach across its building automation work.
A review of the building's existing mechanical plant, controls and how much automation is required.
DDC controller selection, control logic and network topology engineered for the plant on site.
Installation managed with project oversight and quality checks, followed by commissioning of each control loop.
Integration onto the BMS platform, plus training and optional ongoing maintenance.
A direct digital controller is the device that reads sensor data, such as temperature or pressure, and adjusts HVAC equipment like valves, dampers and fans in response. It is the core building block of an automated HVAC control system.
In most cases, yes. Resco assesses the existing plant, valves, actuators and dampers on site to determine what can be brought under DDC control and what needs upgrading or replacing.
Cost depends on the number of AHUs, VAV boxes and plant items being controlled, the condition of existing field devices, and how much integration with a wider BMS is required. Resco provides a proposal after assessment.
Resco's HVAC controls run on open protocols including BACnet, LonWorks and Modbus, which allows plant and field devices from multiple manufacturers to be integrated onto one control platform in most cases.
Yes. With regional offices in Lahore and Islamabad in addition to its Karachi head office, Resco delivers HVAC controls projects for clients across Pakistan.
Talk to Resco about DDC controls for your building's HVAC plant.