MrCool GeoCool : Install Manual : Page 21

9.0 DHW Tank Preparation

The DHW coil i s a vented double-wall copper heat exchanger and i s suitable for potable water.

The DHW pump is installed inside the unit and connected to a fused terminal.

1. Turn off the power supply or the fuel supply to the DHW tank. I F THE POWER IS NOT TURNED

OFF PRIOR TO DRAINING THE TANK, THE ELECTRIC HEATING ELEMENTS WILL BURN

OUT!!

2. Close the cold water supply valve to the DHW tank.

3. Attach water hose to the tank drain connection at the bottom of the tank and empty the tank to a

drain or outside l ocation.

4. Open the pressure relief valve or faucet nearby to break the vacuum i nside the hot water tank to

speed up the draining process.

5. After the tank has been drained disconnect the hose and remove the DHW tank drain fitting. 9.1

Desuperheater Option Installation

Install the desuperheater circuit similar as shown i n Fig. 5.2. Include i solation valves and two boiler

drain valves for tank draining and DHW system purging. The valves shown i n the drawing below

allow for pump service without draining the DHW tank. A horizontal swing check valve must be

used to prevent water i n the tank from flowing backwards when the pump i s not running. Use 3/4

inch copper pipe for l ower DHW pressure drop. Remove existing drain port from the hot water tank

and

i nsert a standard dielectric fitting (thread the male end of the fitting i nto the water heater drain

port using a P. T. F. E. based thread sealer) and continue with the installation as shown. Insulate all

desuperheater circuit piping with pipe i nsulation.