Lennox ZHA series heat pump complete set (507257-01b)

Lennox ZHA series heat pump complete set (507257-01b)

Core Security and Basic Instructions

1. Safety warning (highest priority)

Operation qualification: It is explicitly required that installation, commissioning, and maintenance must be carried out by licensed HVAC professionals or equivalent service organizations. Improper operation may result in property damage, personal injury, or even death.

Electrical safety: power-off operation is a prerequisite - the power supply of the unit must be turned off during any maintenance to avoid the risk of electric shock or explosion; Before powering on, it is necessary to confirm that the voltage meets the range indicated on the nameplate, and the three-phase power supply must ensure phase balance (especially for models with frequency converters).

Refrigerant compliance: In accordance with the 1990 Clean Air Act, intentional discharge of CFCs and HCFCs refrigerants is prohibited, and compliant methods such as recycling, regeneration, or reuse must be adopted. Violation may result in fines or imprisonment.

Roof protection: The unit contains refrigerant and engine oil, and some rubber roof materials may absorb engine oil, causing expansion and leakage. During installation and maintenance, the roof surface should be protected to avoid direct contact.

2. Basic parameters and applicable scope

Unit specifications: Cooling capacity covering 7.5-10 tons, optional distribution heating module; Some models support air supply frequency converters, which can automatically adjust the fan speed according to the load during cooling (low load low speed, high load high speed). When the fan runs alone, it is at low speed, and when heating, it is at high speed.

Installation restrictions: It is prohibited to use the unit as temporary heating/cooling equipment during the construction phase. Low temperature return air, harmful gases, or clogged filter elements can damage the unit; If used in violation of regulations, specific conditions must be met (such as thermostat control, installation of pre filters, etc.), otherwise the warranty will be invalidated.

Core installation process and technical requirements

1. Preliminary preparation: Packaging inspection and installation clearance

Packing list: A single package contains one assembled unit. Upon receipt, it is necessary to immediately inspect for transportation damage. If there are any issues, contact the final carrier.

Installation clearance (key dimensions): It is necessary to strictly follow the operation and operation clearance around the unit to ensure heat dissipation and maintenance space, as shown in the following table:

|Gap Type | A (inches/millimeters) | B (inches/millimeters) | C (inches/millimeters) | D (inches/millimeters) | Top Gap|

|Maintenance gap | 36 (914) | 36 (914) | 60 (1524) | 36 (914) | unobstructed|

|Minimum operating clearance | 36 (914) | 36 (914) | 60 (1524) | 36 (914) | unobstructed|

2. Unit support and fixation

According to the direction of air supply (downward air supply/horizontal air supply), the support requirements vary, and the core is to ensure that the unit is level, leak proof, and corrosion-resistant:

Down air supply application: can only be installed on non flammable surfaces; If installed on flammable surfaces, it is necessary to use Z1CURB roof installation frame, which should be horizontal (with an error of ≤ 1/16 inch per linear foot, or ≤ 5 millimeters per meter) and sealed and fixed to the roof.

Horizontal air supply application: The top of the support platform should be about 4 inches (102 millimeters) above the ground to avoid water accumulation; The supporting structure needs to be built along the four sides of the unit base, made of steel or anti-corrosion treated wood, with a recommended minimum height of 14 inches (356 millimeters) to prevent moisture from entering.

General requirements: The air duct should be connected to the roof frame rather than the unit itself, and the return air static pressure box should be installed before the unit is in place.

3. Lifting and positioning (to avoid structural damage)

Lifting parameters: The maximum weight of the unit (including all accessories) is 1270 pounds (576 kilograms), and 4 cables need to be used to connect the base track holes, along with the "H-shaped lifting device" provided on site to prevent deformation of the unit.

Key steps:

Remove the wooden base protection board before lifting;

Connect the two holes at each corner of the cable base to ensure that all panels are installed in place before hoisting;

After partially lifting the unit, remove 5 L-shaped brackets that fix the protective substrate;

The new roof curb (length 89-3/8 inches) requires the removal of 3 positioning brackets, while the old curb (length 81-3/4 inches) needs to be positioned with positioning brackets as shown in the diagram.

4. Connection between condensate discharge and air duct

Condensed water drainage: The unit is equipped with a 1-inch NPT drainage interface, and the drainage pan is made of fiberglass reinforced engineering plastic. When connecting, the pipe joint needs to be manually tightened and then an additional 1/4 turn should be added to avoid damage caused by excessive force; A trap must be installed, and the drainage pipeline must have a slope of 1 inch (25 millimeters) every 10 feet (3 meters), in accordance with local drainage regulations.