Bosch TW Series Specifications download pdf (Page 12)

Subject to change without prior notice Revised 03-11

6 720 220 047

TW Series / Water to Water

For example:

Cooling set point = 45˚F

Differential = 1˚F

The heat pump will cycle on in cooling at 46˚F. If a

two stage machine, stage 2 will come on at 48˚F or

2˚F degrees above set point and one degree differ-

ential. The unit will shut off at set point.

Heating set point = 120˚F

Differential = 1˚F

Stage one will come on at 119˚F and stage 2 will

come at 117˚F. Both stages will remain running

until set point is achieved. Stage 1 and stage 2 will

cycle on and off according to the lead\lag pro-

grammed interval.

Whenever there is a demand for heating and cool-

ing and during the rst stage of operation the

temperature isn’t changing, then the control will

activate the second stage after a three minute delay

from the rst stage activation. This logic will apply

when the control is powered up, on a power inter-

ruption, when the mode function is set to OFF and

then back to either HEAT or COOL and when

switching from heating to cooling or vice versa in

the auto changeover mode.

Heating and cooling set points are adjusted by

selecting each mode on the key pad and then using

the up-down arrows to select the set point. Thus,

push cool mode button and use down arrow to

45˚F. Push heat mode button and use up arrow to

120˚F.

The controller can be set to control heating only,

cooling only, or auto change modes. The mode

button is pushed until the circular LED is lit next to

the chosen control mode.

INITIAL CONFIGURATION

After power up and the steps above are completed

the conguration default settings may be changed.

Holding down the up and down arrow buttons

simultaneously for 10 seconds will put the control-

ler into the conguration mode. This mode will be

exited if no other commands are given within a 10

second period.

Please review all the following steps and enter the

values you want to set at each display eld to avoid

a time out period while conguring. This will also

provide a record of the initial conguration settings.

First display eld

Temperature scale OC or OF. This is selectable by

using the up or down arrows. Once selected hit

“mode” key to advance.

Scale: ______________________

Second display eld

Pump operation: Continuous or cyclic. This is the

load or source or both pumps output relay. This

may be set to continuous pump or cyclic pump

mode to cycle with the compressor by using the up

or down arrows. Once selected hit “mode” key to

advance.

Mode:______________________

Third display eld

Change over dead band setting: This is selectable

from 1 to 6 degrees. This is adjustable from 1-6

degrees by using the up or down arrows. The dead

band setting is only used in the auto change mode

and denes the band where the unit will not oper-

ate. This helps eliminate the possibilities of the unit

cycling from one mode to the other too quickly. For

example, on a heating\cooling residential applica-

tion this could be set as wide as 6 degrees. On a

pool heater application this could be set as tight as

1 degree. Once selected hit the “mode” key to

advance.

Value:______________________

Fourth display eld

Auto change over set point (S2). Adjustable from 55

to 85 degrees. Use up or down arrows to adjust. Hit

the “mode” key to advance. The auto changeover

sensor should be located in an area that will be

indicative of whether the unit should be in the

heating or cooling mode.

Value:______________________

Fifth display eld

Test mode setting, (DE) delay or (ND) no delay: This

is utilized for testing the outputs of the controller

by eliminating the time delays. Use the up or down

arrows to select. The controller will automatically

revert to DE after one cycle to insure safety timings

are restored if installer\commissioner forgets to

Initial Conguration

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Bosch TW Series Specifications Page 12

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