Central Heating 300L Heat Pump Water Heater Instructions

Central Heating 300L Heat Pump Water Heater

Specifications

• Product Name: Twin Coil Cylinder
• Capacity: 300L
• Coils: Twin coil system
• Heating Element: 2.7kW
• Thermostat: Indirect and Element Thermostat
• Probe Pocket: Dual probe pockets

FAQs

• Q: Where should the element be installed in the Twin Coil Cylinder?
  • A: The element should be moved to the lower housing for optimal performance.
• Q: What is the purpose of the spare probe pocket in the lower housing?
  • A: The spare probe pocket is for installing the DHW sensor for the heat pump.

Installation Detail

When heating a 300L twin coil HWC with a heat pump both coils are used to maximise system performance and reduce pressure drop. The element in the cylinder is then only required to be run once a day or once a week for anti- legionella protection as per the requirements of G12. While the element is factory installed in the upper housing in most scenarios is best for this to be located in the lower housing please move the items in the diagram below as per the following instructions.

Please Note: The element should be installed in the downwards-facing position as shown to ensure complete heating of the tank.

1. 2.7kW Element = move to lower housing
2. Probe pocket = move to the upper housing
3. Indirect Thermostat = discard as not required
4. Solar Thermostat = discard as not required
5. Element Thermostat = move to lower housing

The element (now located in the lower housing) has a spare probe pocket for the heat pump’s DHW sensor to be installed. The element should be wired through a local isolation point and a local or switchboard-mounted time clock (supplied by others).

Twin Coil Cylinder Thermostat Setting

• = MINIMUM TEMP
• = MAXIMUM TEMP
• = APPROX 60 °C

Rotate the Spindle Clockwise to Increase the Temperature Set Point

Wiring Instructions

Twin Coil Cylinder Wiring Instructions

Heat Source with Probe: When installing a single coil cylinder on a heat source that can wire a DHW sensor into it such as our Air to water heat pumps, the cylinder should be wired as per below with the element control stat moved to the bottom port on the cylinder. As noted, the Boiler control thermostat is not required, this along with its capillaries can be removed and discarded. Where the heat source cannot heat the HWC above 60°C as required for legionella prevention, we recommend the element is wired through a time clock.

1. 10K NTC Sensor Wired to Heat Source
2. Power Supply
3. Dual Probe Pocket
4. Boiler Control Stat (Not Required)
   • Twin Coil Cylinder: Heat Source with Probe

Heat Source Without Probe

When installing a single coil cylinder on a heat source that cannot be wired with a DHW sensor, the Signal from the Hot water cylinder will need to be wired through the Indirect Thermal cut-out and Indirect Thermostat as shown on the below Diagram. Typically, this Demand Signal to Turn the Heat source on (and open a Zone valve) would be wired through a time clock to schedule hot water production. Where the heat source cannot heat the HWC above 60°C as required for legionella prevention, we recommend the element is wired through a time clock.

1. On/Off Signal from Time Clock
2. Power Supply
3. Electric Element & Element Thermostat with High Limit Cut Out
4. Dual Probe Pocket
5. Not Required
   • Twin Coil Cylinder: Heat Source Without Probe

CONTACT INFORMATION

• 0800 357 1233
• info@centralheating.co.nz
• centralheating.co.nz.

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