• Easily accessible system component.
• Ample space for easy access to power and control panels.
• Heavy duty mounting chassis for the whole unit with lifting lugs
• Anti-vibration, mounted Compressor (rubber type)
• Weatherproof, polyester epoxy electrostatic paint oven baled finish for sheet metal and multi epoxy polyester coating for case frame.
• All units are shipped out from factory tested and protecting devices seated against client requirement.
• Variable pitch pulley for evaporator motor (for motors of 5 .5 KM and less).
• Single skin evaporator side with one inch fibre glass installation.

Electrical Features

• Control and power panels include the direct on line starting contactors for the compressors and condenser fan motor
• Internal thermal motor protector for condenser and evaporator fan motor
• Compressor internal thermal protection.
• Anti-recycling protection for compressors (time delay) - through microprocessor.
• Crankcase heater for each compressor.
• Control circuit breaker.
• 220 Volt control voltage
• Microprocessor controller for model PPH 85 and above, with the following main function
• Compressor lead - lag operation to ensure longer life for the compressors and equal running hours between compressors.
• External remote ON / OFF button for remote operation of the unit using external ON / OFF switch or connection to building management system.
• Volt - free terminals available for general alarm indication signal to remote monitoring station.
• One power supply input.
• High and low pressure safety switches (capsule type factory pre-set) from 25Z and up to 12Z.

Refrigerant Features

• Hermetic reciprocating suction gas cooled compressor motor.
• Filter drier.
• Charging points.
• Service valve on liquid line.
• Thermostatic expansion valve.
• Fully charged unit with Freon R407C or R22.
• Solenoid valve.

Construction options:

• Plastic mesh on condenser section perimeter
• Mixing box with manually operated fresh and return air dampers.
• Rooftop arrangement (bottom discharge and return unit)
• Roof-curb mounting.
• Bag filter.
• Anti-corrosion protection for coils for copper/aluminium coils only.
• Copper coils.
• Hot water coil (built inside unit)
• Synthetic fibre media for flat filter
• 2.0" or 4.0" thick flat filter.
• Double skin evaporator side.
• Different evaporator side insulation material.
• 12.0" thick insulation for evaporator side only.
• Economizer option with fresh, return and exhaust air dampers with actuators. If this option is installed in the unit the unit has the ability to work with free cooling or free heating mode allowing it to exploit the external environmental condition as much as possible. Since it avoids turning on the heaters and the compressors. This function can be achieved by controlling the opening / closing of the external air damper. With reference to the difference between the outdoor air temperatures (std) / enthalpy and the indoor air temperature (std) / enthalpy.

Electrical options:

• Power circuit breaker for each motor.
• Main power mould case circuit breaker for the while unit (can also be available with an external handle as an option).
• Low ambient control
• The refrigeration systems in all units are inherently designed to operate efficiently, without extra controls or modifications. To permit the unit to operate in low ambient condition a head pressure contro1 can be installed either by:
• ON / OFF Condenser fans sequencing (for models with 2 condenser tans).
• Varying the speed of * the * condenser fan motor using a speed controller
• Disconnect service switch = a unit mounted non - fused disconnect service switch with external handle to isolate unit from power voltage for servicing.
• Ampere meter and voltmeter Installed on the electric control panel door.
• Earth leakage relay for each compressor.
• Earth leakage relay fort he whole unit.
• External overload relay for each motor.
• Power factor correction capacitor
• Auto pr manual provision for pump down operation of each compressor stop
• Building automation system interface. Interfacing with other building management systems can be achieved by an optional card, which can communicate with other devices using serial communication port.
• Electric heater for heating purposes (built inside unit for cooling units only).
• Electric heater (build inside unit) to supplement unit operation in case of heat pump.
• Special microprocessor controller with additional features such as:
• Economical operation and control with free cooling function.
• Display additional function (condenser pressure, ambient temperatures, return temperature, defrost control, low ambient control, buzzer alarm. etc.)
• Motor actuator for fresh, return and exhaust air dampers.
• Voltage monitor controller (phase failure .etc) for monitoring the main incoming power supply for the unit which provides protection from single phase, low voltage, phase sequence error, etc.

Refrigeration Options

• The unit of heat pump package with 4-way reversing valve, and suction accumulator is a standard feature in heat pump option.
• Pressure gauge for each refrigeration circuit (high / low pressure gauges).
• New refrigerant application (R407c).
• Hot gas bypass (where local situation occurs and where it is necessary avoid low suction pressure and “compressor cycling”)
• Extra refrigerant accessories such as suction accumulator (for cooling units only), refrigerant liquid receivers, and oil separates etc.
• Solenoid valve for heat pump mode.
• High and low pressure switches for models 12z, 16Z and 20Z