Los Angeles County Internal Services Department PO-IS-26007875

Contract to Replace DDC Controllers on Four AHU Units for Los Angeles County Internal Services Department

Los Angeles County Internal Services Department awarded a purchase order (PO-IS-26007875) to ORRAVAN MECHANICAL, INC. for $110,644.00 to remove and replace the existing Direct Digital Controllers (DDC) on four water-cooled packaged air handling units (AHU 1 through AHU 4). The scope includes furnishing and installing new DDC controllers with local display interfaces and expansion modules, developing a custom sequence of operations specific to mechanical design and operational requirements, performing point-to-point checkout and functional performance testing, and fully integrating the units into the existing Building Automation System (BAS). The contract covers both labor and materials for each of the four AHUs. Notable contract requirements include thorough verification of existing wiring before removal, complete documentation of checkout sheets, and the inclusion of alarms, safeties, and interlock logic to ensure proper operation. The department contact is Leopoldo Munguia (email: LMUNGUIA@ISD.LACOUNTY.GOV, phone: 323-351-4722).

Description

AHU 1 LABOR Scope of work: - Remove and replace the existing DDC controllers on (4) water-cooled packaged units, including proper labeling and verification of all existing field wiring prior to removal. - Furnish and install new DDC controllers, complete with local display interfaces and required expansion modules to accommodate all existing and future I/O points. Controllers will be mounted, powered, and wired in accordance with manufacturer standards and project requirements. - Develop and implement a custom sequence of operations for all (4) units, tailored specifically to the mechanical design intent and operational requirements. Sequences will include unit enable/disable logic, cooling control, safeties, alarms, and any interlocks required for proper system operation. - Perform a complete point-to-point checkout for all (4) units, verifying correct termination, signal integrity, and proper operation of all inputs and outputs. Point-to-point checkout sheets will be completed and documented for record and commissioning purposes. - Conduct functional performance testing on all (4) units to confirm proper operation per the approved sequence of operations. This includes testing unit modes, control responses, safeties, alarms, and verifying stable operation under normal and simulated fault conditions. - Fully integrate all (4) units into the existing Building Automation System (BAS), including database setup, point mapping, graphics integration (if applicable), alarm configuration, and verification of communication with the existing system. Quote #30062817-1 Requestor: Leopoldo Munguia 818-686-0180; AHU 1 MATERIAL; AHU 2 LABOR; AHU 2 MATERIAL; AHU 3 LABOR; AHU 3 MATERIAL; AHU 4 LABOR; AHU 4 MATERIALS DEPARTMENT CONTACT: LEO MUNGUIA EMAIL: LMUNGUIA@ISD.LACOUNTY.GOV PHONE# 323-351-4722