Bosch SM070 Specifications download pdf (Page 36)

100

36 | Options SM Series Heat Pump

SM Series Heat Pump6 720 220 406 (2013/9) Subject to change without prior notice

The heat exchanger is rated for use with potable

water and is acceptable for use as a domestic

water heating device in most building codes.

The pump circulates water between the domestic

hot water tank and HRP heat exchanger in the Heat

Pump. The control circuit ensures that the HRP

only operates when there is available heat from the

compressor and when the water is within a safe

temperature range of below 140 deg F.

When the heat pump compressor operates, the

HRP will monitor the temperature of the discharge

gas from the compressor. Once discharge gas is

hot enough to provide useful heat to the domestic

water tank, the circulating pump will be enabled,

drawing water from the tank, through the HRP heat

exchanger and then depositing the heated water

back into the tank. If the water temperature

reaches 140 deg F, the circulating pump is

disabled to prevent over heating of the domestic

water. The HRP is provided with an on/off switch

in case the end user desires that the HRP be

inactivated (typically during the winter months

when space heating is most important).

Constant Airflow Motor

The Constant Airflow Motor is an Electronic

Commutated Motor (ECM) that provides a

constant air flow over a wide range of external

static pressures, while optimizing the power

consumption of the motor.

This option allows the unit to have different air

flow settings depending on the mode that the unit

is operating; i.e heating, cooling, fan only, hot gas

reheat, etc. Refer to the ECM Interface Board

section (pg. 34) for more information.

DPS Water Flow Proving

The DPS water flow proving switch is a factory

installed option available for the SM series. The

DPS prevents compressor operation if there is

inadequate water flow through the water to

refrigerant heat exchanger in the heat pump.

The DPS operates by monitoring the water side

pressure drop across the water to refrigerant heat

exchanger. When the pressure drop between the

water in and water out lines reaches a pre-set

value, compressor operation is enabled.

Pump Relay

The factory installed pump relay can be used to

energize a supply pump or solenoid valve when

there is a call for compressor operation. This relay

can be used to switch either high or low voltage

power.

Comfort Alert Module

The Comfort Alert diagnostics module (CADM) is a

breakthrough innovation for troubleshooting heat

pump system failures. (Figure #100)

Figure # 100

By monitoring and analyzing data from the

compressor and the thermostat demand, the

module can accurately detect the cause of

electrical and system related failures without any

sensors. A flashing LED indicator communicates

the ALERT code and guides the service technician

more quickly and accurately to the root cause of a

problem.

When an abnormal system condition occurs, the

Comfort Alert module displays the appropriate

ALERT and/or TRIP LED.

The yellow ALERT LED will flash a number of times

consecutively, pause and then repeat the process.

To identify a Flash Code number, count the

number of consecutive flashes.

Every time the module powers up, the last ALERT

Flash Code that occurred prior to shut down is

displayed for one minute.

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.

This module does not provide safety protection!

The Comfort Alert module is a monitoring device

and cannot shut down the compressor directly.

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Bosch SM070 Specifications Page 36

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