User Manual for Temperzone VPA 160RKTG-DP Air Cooled Packaged Unit

Quick guide from the manual

The Temperzone VPA 160RKTG-DP is an air cooled packaged unit featuring a digital scroll compressor and UC8 controller. Important: Before starting the compressor, a 4-hour crankcase heater delay is required. Ensure mains power is switched on during this period. The unit must be installed by a qualified professional in accordance with local regulations.

Installation

The unit should be fastened to a firm, flat horizontal base using the mounting channels. If installing on a roof, use a substantial structure with vibration-isolating mounts. Flexible duct connections are recommended.

• Clearances: Maintain at least 1000mm at the front, 100mm at the sides and rear. If units are side-by-side, allow at least 2m between coil faces.
• Condensate Drain: The drain is U-trapped inside the unit. Direct the outlet to a suitable disposal site.
• Vertical Discharge Grille: If using the optional grille, secure it using the supplied screws and pre-drilled holes.

Wiring and Controls

Electrical work must be performed by a qualified electrician. The unit requires a direct connection from a distribution board via a circuit breaker and mains isolator.

• Control Options: The unit supports TZT-100 wall thermostats, 24V AC/0-10V external signals, remote on/off switches, Modbus RTU, and BACnet-IP (with optional gateway).
• Capacity Control: Managed via the UC8 controller. DIP switch 14 selects between Standard (OFF) and Close (ON) capacity control modes.
• Modbus RTU: For monitoring and control, daisy-chain connections using shielded twisted pair cable. Ensure each UC8 controller has a unique device address.

Start-Up Procedure

Before commissioning, ensure the 4-hour crankcase heater delay has passed. To commission:

1. Place the UC8 Controller in commissioning mode by holding the push button until the display shows 'c'.
2. Start the compressor in cooling mode and check for correct rotation.
3. Measure current draw on each phase and verify against specifications.
4. Test heating mode operation.
5. Adjust indoor fan speed if necessary using the UC8 display and push button.

Operation

The UC8 controller manages safety timers and protection functions. If the compressor is held off or on by a safety timer, the display shows 'H-O-L-d'. The unit features a single variable capacity digital scroll compressor.

Maintenance

Monthly: Check air filter (vacuum or wash), check condensate drain, inspect compressor compartment for oil stains, and check system operating pressures via UC8.

Six Monthly: Check tightness of electrical connections, inspect for corrosion in high salt atmospheres, check fan/motor mountings, and check/replace indoor air filter.

Yearly: Check refrigerant piping for chafing/vibration, test electric heaters, check air supply at diffusers, inspect for excessive noise, and clean outdoor coil fins with a soft brush or low-pressure water spray.

Troubleshooting

If the unit displays an error code, refer to the UC8 Controller label or the Temperzone website. Common issues include water leaks (check drain trap/slope), heating performance (check for de-icing cycles), and unit lock-out (reset via power cycle or Modbus command).