A specification for the Colt-Caloris Water Source Heat Pump

Manufacturer:
Colt International Limited
New Lane, Havant, Hampshire. PO9 2LY
Tel. 023 9245 1111
Fax. 023 9245 4220

Product Reference: Colt-Caloris Water Source Heat Pump

Complete System:

The air conditioning system shall be Colt-Caloris Reverse Cycle Water Source Heat Pump manufactured by Colt International Limited.

The system shall be capable of providing the relevant duties scheduled whilst operating with a water system temperature between 15°C to 30°C with an optimum efficiency being achieved between 20°C to 25°C.

The water system temperature shall be maintained via a centrally positioned reverse-cycle water source heat pump.

There shall be no limit to the number of room units that can be incorporated in the system.

The water energy transfer system shall use uninsulated plastic pipe supplied and installed by the services contractor.

The system shall comply with PED 97/23/EC.

Local Heat Pump Unit:

The local Colt-Caloris unit shall be completely self contained.

The local Colt-Caloris unit shall be capable of achieving a NR level of 28 / 30 / 32 / 34 (delete as necessary).

The local Colt-Caloris unit shall not exceed a depth of 247mm.

Each unit shall comprise a thermal and acoustic lined galvanised steel chassis up to 2mm thick, enclosing the following items. Double inlet centrifugal type recirculating air fan / fans, directly coupled to a 3 speed electric motor of the permanent split capacitor type with sealed for life bearings and thermal overload protection built in as standard.

Balanced fan / motor assembly is secured through anti-vibration mounts to the fan deck.

Air to refrigerant heat exchanger (air coil) constructed from 32-row (8 x 4) grooved copper tubes with mechanically bonded aluminium fins and expansion through capillary. (This is the specification for horizontal units sizes 1 to 4. For the horizontal unit size 7, the heat exchanger is constructed from 70-row (5 x 14) tubes. For the vertical units, the heat exchanger is constructed from 30-row (10 x 3) tubes).

Water to refrigerant heat exchanger (water coil) constructed from copper with special finned and grooved spiral shell-in-tube to refrigerant heat exchanger.

Horizontal rotary type refrigerant compressor supported on anti-vibration mountings designed to minimise vibration.

Washable, long life recirculation air filter, easily accessible for removal from the rear of the unit. Filter Grade EU3.

The unit shall be supplied complete with an integral acoustically lined discharge plenum and 200mm spigots.

Thermal and acoustic insulation up to 20mm thickness throughout shall be fire rated Class O foam.

Colt-Caloris horizontal units shall be suitable for fitting in the void above a suspended ceiling or beneath a raised floor, via suitable drop rods and AV mountings supplied by the installation contractor. Each unit shall have inbuilt protection controls including HP cut out and LP cut out, low limit water thermostat / automatic reset frost thermostat and thermal current overload protection on the compressor and fan motor.

Each unit shall be supplied with 15mm plain copper tails suitable for compression fitting to the water system by the installation contractor. The contractor shall provide suitable fittings and isolating valves on the water inlet and outlet and a flow setting /regulating device on the return pipe.

Each unit is designed to be self purging. The contractor shall arrange for venting of air from the water system pipework.

Each unit shall be suitable for 220-240V/1/50Hz and shall include an integral start delay timer built into the unit. Each unit is supplied with an electrical noise EMC filter and full width insulated, hygienic stainless steel drainage tray.

The unit shall be energy efficient with an overall cooling Coefficient of Performance of between 4.21 and 5.55 or greater, supported by independent test data according to EN 255.

Central Heat Pump:

A specially designed, low noise, centralised heat pump must be used to maintain the overall system parameters.

The central heat pump must be suitable for maintaining the water system temperature between 15°C and 30°C throughout peak summer and winter periods and include an hydronic module to reduce installation time.

The central heat pump must be optimised for use with R-407C. The central heat pump shall include a suitably sized water pump and expansion vessel with the possibility for a buffer tank.

The central heat pump must also include frost protection, pressure regulating valve, pressure port pump, filter, safety valve, manometer, drain valve, fill valve, air purge, evaporator, flow switch, pressure port evaporator, water temperature sensor in and water temperature sensor out. Shut of valves for easy water filter cleaning must also be provided.

Please contact Colt for full technical selection and performance data.

Water System:

The system shall utilise long life polyethylene piping for the neutral water system with an expected life expectancy in excess of 50 years.

Piping shall comply with BS 7291 and must be BBA Approved made under ISO 9001 quality procedures and listed in the WRAS (Water Regulations Advisory Scheme) and are BBA Approved.

Minimum pressure rating shall be no less than 6 Bar pressure with a resistance of up to 45 Bar. Piping shall be at least 1.9mm thick with an overall diameter of at least 20mm.

Controls:

Analogue or digital controls shall be provided for climate control of the individual space.

Each unit shall be capable of operating independently using manual controls or, in a master / slave group scheme of up to 10 units in conjunction with a digital controller.

Each controller shall incorporate an on-off switch / fan speed selector and temperature control adjustment, mode switch, unit functioning and fault LED indicators. It shall also include an optional comprehensive diagnostic facility, which can be accessed to determine the status of the unit and be fitted with a controller designed to maintain the temperature selected by controlling the compressor to operate in either cooling or heating modes as required.

Manufacture:

All Colt-Caloris units will be manufactured in accordance with BS EN ISO9001:1994, and will be sound tested to EN 3741, and will be capacity tested to EN 255.

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