Heat Recovery Package - Bosch TW Series Installation And Maintenance Manual

14 TW Series / Water to Water

HeaT reCovery paCkaGe

The Heat Recovery package is a factory mounted
option. It consists of a forced pumped unit that em-
ploys a circulating pump to move water through a
double wall/vented heat exchanger and returns the
heated water to the water tank. The water is heated by
superheated refrigerant discharge gas from the
compressor. This waste heat of the cooling mode
captured by the heat recovery increases the capacity
and efficiency of the heat pump unit. If the air tempera-
ture is uncomfortable coming from the air vents in the
heating mode the heat recovery may need to be turned
off. In the heating mode the heat recovery captures
heat that would normally be used for space heating.
If heat recovery unit is installed in an area where
freezing may occur, the unit must be drained
during winter months to prevent heat exchanger
damage. Heat exchanger ruptures that occur due
to freezing will void the heat recovery package
warranty along with the heat pump warranty.
6 720 220 047
TypICal ConneCTIon pIpInG
WaTer Tank preparaTIon:
1. Turn off electrical or fuel supply to the water heater.
2. Attach garden hose to water tank drain connection
and run other end of hose out doors or to an open
drain.
3. Close cold water inlet valve to water heater tank.
4. Drain tank by opening drain valve on the bottom
of the tank, then open pressure relief valve or
hot water faucet.
5. Once drained the tank should be flushed with
cold water until the water leaving the drain hose
is clear and free of sediment.
6. Close all valves and remove the drain hose.
7. Install HR water piping.
Hr WaTer pIpInG:
All hot water piping should be a minimum of 3/8t
O.D. copper tube to a maximum distance of fifteen
(15) feet. For distances beyond fifteen feet but not
exceeding sixty (60) feet use 1/2" copper tube.
Separately insulate all exposed surface of both
connecting water lines with 3/8" wall closed cell
insulation. Install isolation valves on supply and
return to the heat recovery. (Figure #5)
figure #5
Subject to change without prior notice
Heat recovery package
Revised 03-11