The production of hot water can be handled in two different ways. Integrated and free standing. The most common method is to integrate the process completely into the ANK control system.
(1) Integrated Operation
The DHW thermostat sensor is to be installed into the storage tank. The control wires from the DHW thermostat send a signal to a three way diverting valve to switch position and change the flow of the water from the space heating and cooling circuit to the DHW storage tank circuit. When the end switch (dry contacts) on the 3 way diverting valve closes the ANK terminals T-10 and T-11 indicate to the Moducontrol that DHW has priority over all other operations. The ANK will start up and continue to heat DHW until the DHW thermostat sensor is satisfied at which time the diverting valve will return to heating or cooling the space as the end switch opens. As soon as the end switch opens the ANK resumes control of the space conditions.In order to heat domestic hot water the ANK series units must be fitted with an outdoor fan speed controller to eliminate nuisance high pressure cutouts during the summer months.
The set up of an ANK for domestic hot water production requires the following changes to the unit to be made prior to start-up:
1. Install DCPX control as per distributors suggested instructions2. Switch Moducontrol switch position 7 to on3. Change Moducontrol programming for flow switch bypass4. Set password 30 parameter A to 15. Set password 30 parameter E to 1 6. Set password F to 180 seconds. To allow valve to fully open before Domestic hot water production starts7. Set domestic hot water temperature as required. Lowest DHW temperature below 50 deg. C. acceptable by client works best
(2) Stand-a-Lone Operation
In this mode the ANK does not take over the full heating control of the domestic hot water operation. The heating of the storage tank is completed in two stages as the ANK preheats the incoming wiring and a secondary water heater (electric or gas) completes the process. The on board storage tank thermostat is used as a second stage heating control is separate from the ANK system and allows for an independent heating of the DHW in the event stage one heating is not active. Terminals T-12 and T-13 are not connected in this scenario.