Install the Drainpipe for UYB-20 Floor-Ceiling Flex SystemsUpdated an hour ago
Introduction
This article explains how to install the drainpipe for UYB-20 floor-ceiling flex systems.
The drainpipe directs water away from the unit. Improper installation can damage the unit or property.
Prerequisites
Caution
- Insulate all piping to prevent condensation, which could lead to water damage.
- If the drainpipe is bent or installed correctly, water may leak and cause a water-level switch malfunction.
- In Heating mode, the outdoor unit will discharge water. Ensure the drain hose is placed in an appropriate area to avoid water damage and slippage.
- Do not pull the drainpipe forcefully. This could disconnect it.
Installation Notes
- When using an extended drainpipe, tighten the indoor connection with an additional protection tube to prevent accidental disconnection.
- The drainpipe should slope downward at a gradient of at least 1/100 to prevent water from flowing back into the air conditioner.
- To prevent the pipe from sagging, space the hanging wires every 3-feet, 3-3/8-inches to 4-feet, 11-inches (1-1.5 m).
- The drainpipe outlet should be at least 2 inches (50 mm) above the ground. If it touches the ground, the unit may become blocked and malfunction.
- The installation requires a polyethylene tube with an exterior diameter of 1 inch (25 mm). This tube can be obtained at a local hardware store or dealer.
1. Plan the Piping Layout
Before beginning the installation, plan the drainage piping layout and connection.
2. Cut the Piping
Cut the piping according to the intended layout and connection.
3. Insulate the Drainpipe
Insulate each pipe before beginning the connection, excluding the joint sections. These will be insulated at the end of the procedure.
Ensure the insulation material is fitted tightly with no gaps. Do not over-tighten the insulation material. This may compress the air out of the material, causing poor insulation and early aging.
Purpose
Ensure all piping is properly insulated to prevent condensation. Insufficient insulation may allow dew to form due to low condensate temperatures, resulting in potential water damage.
Select the Insulation Material
The insulation material must be made of flame-retardant material. Select a material that complies with local regulations.
The thickness of the insulation material must be more than 3/8 of an inch (10 mm).
Apply specialized adhesive to the insulation seams, then secure them with tape. Ensure the tape is at least 2 inches (51 mm) wide. Make sure the tape is applied firmly to prevent condensation.
4. Install the Drainpipe
Attach the drainpipe to the indoor unit's drain line connection.
Unlike wall-mounted systems, ceiling cassette units and other light commercial air conditioning systems require a PVC drain line. The flexible drain hoses are not suitable for these applications.
Use a rubber coupler to connect the drainpipe to the PVC drain, ensuring a secure, water-tight seal. The rubber coupler and PVC drain line are sold separately from the system. 
This is how the drainpipe assembly should look when attached to the PVC line with the rubber coupler. 
Install the drainpipe assembly as illustrated: 
When connecting multiple drainpipes, install them as illustrated: 
5. Pass the Drainpipe Through the Wall Hole
When passing the drainpipe through the wall hole, make sure the water drains to a safe location where it will not cause water damage or a slipping hazard.
The drainpipe outlet should be be at least 1-7/8 inches (48 mm) above the ground. If it touches the ground, the unit may become blocked, potentially leading to a malfunction.
If the water is discharged directly into the sewer, ensure the drain hose has a U or S pipe to prevent odors from coming back into the house.
6. Complete a Drainage Test
Complete a drainage test for the floor-ceiling flex system.
7. Insulate the Joint Sections
The pipe joint insulation should 2-4 inches (51-102 mm) longer than the gap to ensure a proper seal.
Insert the pipe joint insulation into the gap of the existing insulation.
Ensure the pipe joint insulation is securely fastened to the suction and liquid pipes to prevent gaps. Use glue to paste together the linking part. Do not over-tighten the insulation material. This may compress the air out of the material, causing poor insulation and early aging.