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 Heat Pump manufactured by Colt International Limited, New Lane, Havant, Hampshire, PO9 2LY.

The system shall be capable of providing the relevant duties scheduled whilst operating with a water loop temperature between 20°C to 25°C.

The water loop temperature shall be maintained via centrally positioned reverse cycle heat pumps. There shall be no limit to the number of room units that can be incorporated in the system.

The water loop energy transfer system shall be un-insulated plastic pipe supplied and installed by the services contractor.

The air conditioning system units shall be energy efficient with an overall cooling Coefficient of Performance of between 4 or greater, supported by independent test data according to EN 14511.

The local heat pump unit

The Colt Caloris unit shall be CE marked and comply with PED 97/23/EC, and be successfully EMC tested. The unit shall be completely self-contained and capable of achieving a typical NR level of (select) 23-28 / 26-32 / 27-32 / 25-30.

The unit shall comprise a thermal and acoustic lined galvanised steel chassis enclosing the following
items:
- Double inlet centrifugal type recirculating air fan/fans, directly coupled to a 5 speed electric motor of the permanent split capacitor type with sealed for life bearings, or an EC motor.
- Thermal overload protection shall be built in as standard.
- The fan / motor assembly is balanced and secured through anti-vibration mounts to the fan deck.
- 32-row (8 x 4) air to refrigerant heat exchanger (air coil); copper tube with mechanically bonded aluminium fins and expansion through capillary.
- Water to refrigerant heat exchanger (water coil) constructed from copper with special finned and grooved spiral shell-in-tube to refrigerant heat exchanger.
- Rotary or scroll type refrigerant compressor supported on anti-vibration mountings designed to minimise vibration. Suitable for permanent split capacitor operation.
- Washable, long life recirculation air filter, easily accessible for removal from the unit. Filter grade EU2/3.

The unit is supplied complete with an integral acoustically lined discharge plenum and spigots. Thermal and acoustic insulation throughout shall be fire rated Class "O" foam (except for Q models).

The Colt Caloris unit is suitable for fitting in the void above a suspended ceiling or beneath a raised floor, via suitable drop rods and AV mountings supplied by Colt.

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 switches on compressor and fan motor.

Each unit shall be supplied with 15mm or 22mm plain copper tails suitable for compression fitting to the water loop 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/1/50 Hz as appropriate to the electrical supply and shall include an integral random start delay timer built into the unit. The electrical contractor shall provide all site wiring connections to the unit terminals and remote supply circuit overload protection and control/sequence start system as necessary to satisfy temperature, safety and electric current limiting space requirements.

Controls

Each unit shall be capable of operating independently using manual controls or, in a master/ slave group scheme of up to 16 units in conjunction with a digital controller. Each controller shall incorporate on-off switch/fan speed selector and temperature control adjustment, mode switch, unit functioning and fault LCD indicators. It shall also include an optional comprehensive diagnostic facility for service which can be accessed to determine the status of the unit and be fitted with a USB controller designed to maintain the settings and parameters selected.

Central heat pump

A specially designed, low noise, centralised heat pump shall be used to maintain the overall system parameters. The central heat pump shall be suitable for maintaining the water system temperature between 15°C and 30°C throughout peak summer and winter periods and include a hydronic module to reduce installation time.

The central heat pump shall 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 shall 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 shall 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 shall 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.

Manufacture

All Caloris units will be manufactured in accordance with BS EN ISO9001:1994. All units comply with EN 3741 as regards acoustic performance, and will be capacity tested to EN 14511.
The system shall be supplied by Colt International Limited, New Lane, Havant, Hampshire, PO9 2LY, UK.

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