Bosch Geothermal Heat Pumps User Manual download pdf (Page 15)

Geothermal

All WW Series units come ready for geothermal applications.

Controls And Interface Options

Designed to enhance the unit operation with more ﬂexibility,

accurate control and operating modes, the FHP controllers

and interface options provide an increased level of comfort in

the conditioned space together with solid state reliability and

ease of operation.

Unit Protection Modules

UPM1 And UPM2

The Unit Protection Modules UPM1 and UPM2 are standard

on most FHP units and were developed to enhance their

operation. The UPM1 is designed for single compressor

models while the UPM2 is designed for dual compressor

models have the same features.

The (optional) freeze protection will prevent unit operation

below 35° F (1.7° C) leaving ﬂuid temperature.

Each controller has a random start feature programmed into

its microprocessor ranging from 270 - 300 seconds preventing

the simultaneous starting of multiple units. An anti-short

cycle timer allows a 5 minute delay on break timer to prevent

compressor short cycling. A low pressure bypass timer switch

prevents nuisance lockouts during cold start up. The high

pressure switch delay of one (1) second provides switch

stabilization on start up to prevent nuisance lockouts.

The Unit Protection Modules monitor the operating condition

of the unit by providing:

A Brownout / Surge / Power Interruption

Protection - This allows for the water pumps

to restart and establish water ﬂow to prevent

nuisance lockouts during brief power interruptions.

Malfunction Output - The controller has a set of 24

volt contacts for remote fault indication.

Test / Service pin - A jumper is

provided to reduce all time delay

settings to 6 seconds during

troubleshooting or operation veriﬁcation.

L.E.D. Indicators

Intelligent Reset.

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Bosch Geothermal Heat Pumps User Manual Page 15