FAW Logic Assembly For Air Conditioning And Heating Pipework: Decoding 9 Essential Comfort Components

Welcome to this critical “comfort logic” analysis of the FAW Logic Assembly For Air Conditioning And Heating Pipework (Assembly 716). This is the complete, 9-component-type, “circulatory system” for the *heating* half of the HVAC system on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tractor. This assembly is the “logic” system that safely transports hot engine coolant (antifreeze) from the engine block to the in-cab ‘Heater Core’ (Assembly 709).

The “logic” of the FAW Logic Assembly For Air Conditioning And Heating Pipework is to act as a durable, leak-proof, and heat-resistant “plumbing” network. It is designed to withstand 90-100°C temperatures, 15-20 PSI of pressure, and constant, high-frequency engine vibration. This system is the key to providing reliable cab heat for driver comfort and vital defrosting capabilities for the ‘Front Windscreen’ (Assembly 630).

This in-depth guide is essential for HVAC technicians and parts managers. We will deconstruct the entire FAW Logic Assembly For Air Conditioning And Heating Pipework into its 9 distinct serviceable component types. We will analyze the “multi-layer” logic of the main ‘Inlet/Outlet Hoses’, the “fume-seal” logic of the ‘Joints’, and the critical “anti-chafe” logic of the 17-piece clamp, bracket, and fastener system.

Core 1: The “Heat Transport” Logic (Components 1 & 2) (The “Longer” Module)

The “arteries” of the FAW Logic Assembly For Air Conditioning And Heating Pipework are its two main hoses. These are the primary serviceable components in this system.

1. Component 1: ‘Inlet hose’ (8116711-90U)

This is the “supply” line. Its “logic” is to tap into the engine’s cooling system (e.g., at the cylinder head or water pump) and transport *hot* (90°C+) coolant *to* the ‘Heater Core’ (Assembly 709) inside the cab.

“Multi-Layer” Logic: This is not a simple rubber tube. It is a “multi-layer” composite hose, typically made of an inner EPDM (Ethylene Propylene Diene Monomer) rubber, a central “rayon” or “aramid” fiber reinforcement braid, and a tough, abrasion-resistant outer EPDM cover. This “logic” is critical for:

• Pressure: The fiber braid allows the hose to withstand the 15-20 PSI of the cooling system without swelling or bursting.
• Chemical: The EPDM inner lining is chemically inert, preventing it from being degraded by the ethylene glycol (antifreeze) in the coolant.

2. Component 2: ‘Outlet hose’ (8116712-90U)

This is the “return” line. After the coolant has “dumped” its heat into the ‘Heater Core’ (709), this hose’s “logic” is to transport the (now cooler) coolant *back* to the engine’s cooling system (e.g., to the radiator or water pump) to be re-heated.

3. The “Molded-Fit” Logic (Both Hoses):

The most critical “logic” of these hoses is their shape. They are not straight. They are “pre-molded” at the factory into a specific, 3D shape. This “logic” is essential for a safe, reliable installation. The pre-molded bends are designed to *perfectly* route the hose around the hot ‘Exhaust Manifold’ (Assembly 132), the moving steering column, and the vibrating engine block.

Serviceability: Hoses are the #1 failure point in a heating system. After 5-10 years, the EPDM rubber hardens, becomes brittle, and “cold-leaks” at the ‘Clamps’ (Component 3), or develops “soft spots” and bulges, which can lead to a catastrophic burst. A burst heater hose will rapidly drain the engine of coolant, leading to overheating. This makes these hoses a critical, high-wear serviceable part.

Core 2: The “Interface & Anchor” Logic (Components 5, 7, 8)

This group of components is the “infrastructure” of the FAW Logic Assembly For Air Conditioning And Heating Pipework.

Components 5 & 7: ‘Water pipe joint’ (8116061-90U & 8116703-590): These are the “interface” logic. These are the “firewall pass-throughs.”

Their “logic” is to provide a “bulkhead” connection, allowing the rubber ‘Inlet/Outlet Hoses’ to safely pass through the cab’s metal firewall (‘Welded Cab Assembly’ 617). They are made of corrosion-proof polymer or brass. Their most critical “logic” is the integrated “grommet,” which creates a 100% airtight seal. This “fume-seal” logic is a safety feature that prevents engine bay fumes (CO) from being “sucked” into the cab’s HVAC intake.

Component 8: ‘Heater water pipe fixed bracket’ (8116074-91W): This is the “anchor” logic. A long, 1-meter hose, full of heavy water and vibrating with the engine, is an “uncontrolled” component. This bracket’s “logic” is to be the “anchor,” securely fastening the hoses (via clamps) to the chassis. This “anti-chafe” logic prevents the hoses from rubbing against the frame, which would eventually wear a hole.

Core 3: The “Anti-Leak” & “Anti-Chafe” Logic (Components 3, 4, 6, 9)

This final group of 11 components is the “fastening logic” for the FAW Logic Assembly For Air Conditioning And Heating Pipework.

Components 3 & 6: ‘Worm-drive hose clamp’ (CQ67627B / CQ67635B) – Qty 4 total: This is the “high-pressure seal” logic. These are *not* simple spring clamps. A “worm-drive” (screw-type) clamp provides a 360-degree, high-torque “clamping” force. This “logic” is what seals the rubber ‘Hoses’ (1 & 2) onto the metal/plastic ‘Joints’ (5 & 7), ensuring a leak-proof fit under 15+ PSI of pressure.

Component 4: ‘Plastic retaining strap’ (T67427946) – Qty 6: This is the “anti-chafe” logic. These 6 straps (zip-ties) are critical serviceable parts. Their “logic” is to bundle the “inlet” and “outlet” hoses together and/or secure them *away* from other components (like the steering shaft). A missing strap is a primary cause of a “rub-through” hose leak.

Component 9: ‘Combination bolt’ (CQ1460620) – Qty 1: This is the “anti-vibration” logic. This single bolt is used to mount the ‘Fixed Bracket’ (Component 8) to the chassis. The “Combination” (组合) logic is its *captive lock washer*, which prevents the bracket from vibrating loose.

FAW Logic Assembly For Air Conditioning And Heating Pipework Parts List

The following table provides the complete, detailed breakdown of all 9 component types identified in the FAW Logic Assembly For Air Conditioning And Heating Pipework for the FAW CA4251P66K24T1A3E5 tractor.

Specifications

The specifications for the FAW Logic Assembly For Air Conditioning And Heating Pipework are defined by its function as the high-pressure, high-temperature “circulatory system” for the cab heater.