Bosch Geothermal Heat Pumps Applications Manual page 114

1 1 4 | Bosch Geothermal Heat Pumps
Rout the wiring harness through the unit corner post
and assure the wires are inside the unit electrical box.
Terminate the DDC digital output wires on the unit
terminal block according to the provided DDC wiring
diagram. On units with ECM interface boards, cut the
provided terminals and connect the wires on the ECM
control board (Fig. 139).
Terminate the DAT and the LWT sensors according to the
DDC wiring diagram.
THERMOSTAT THERMOSTAT
CONNECTION BLOCK CONNECTION BLOCK
Fig. 139
Data subject to change
FROM DDC CONTROL FROM DDC CONTROL
BLU BLU
C C C C C C O O Y Y R R G G
POWER POWER
G G
STATUS STATUS
R R
FREEZE FREEZE
TEMP TEMP
LOCKOUT LOCKOUT
RESET RESET
ALARM ALARM
TEST TEST
C-GND C-GND
GRN GRN
OR OR
G/Y G/Y
WHT WHT
BLK BLK
LEADS FROM LEADS FROM
BLOWER MOTOR BLOWER MOTOR
COMPRESSOR COMPRESSOR
CONTACTOR CONTACTOR
TRANSFORMER TRANSFORMER
TRANSFORMER TRANSFORMER
PRIMARY LEADS PRIMARY LEADS
LPC2 LPC2 LPC1 LPC1 Y Y Y Y HPC HPC HPC HPC
UNIT PROTECTION MODULE UNIT PROTECTION MODULE
ORG ORG
NO NO YES YES
35F 35F 15F 15F
4 4 2 2 OR OR
R R Y Y
CONT CONT PULSE PULSE RED RED
DRY DRY HOT HOT
YES YES NO NO
ALR ALR
C C C C DRY HOT DRY HOT R R R R CC CC
ORG ORG
OR OR
RED RED
BLK BLK
Applications Manual
Bosch Thermotechnology Corp.