Enable-Off-Remote Contact Switch (Sw1); Emergency On/Off Switch (Sw2); Energy Management Module (Emm) - Carrier AquaForce 30XV140 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Enable-Off-Remote Contact Switch (SW1) —
The position of the Enable/Off/Remote contact switch is
ignored except when the "remote mode" control type is
selected. Refer to the Machine Control Methods section on
page 20 for more details. A selection for Machine Control
Method must also be made along with the correct position of
the Enable-Off-Remote Contact Switch. This switch is
installed in all units. It is a 3-position switch used to control the
chiller. When switched to the Enable position, the chiller will
be under its own control. When switched to the Off position,
the chiller will shut down. When switched to the Remote Con-
tact position, a field-installed dry contact can be used to start
the chiller. The contacts must be capable of handling a 24-
VAC, 50-mA load. In the Enable and Remote Contact (dry
contacts closed) positions, the chiller is allowed to operate and
respond to the scheduling configuration and set point data.
Emergency On/Off Switch (SW2) —
installed in all units. The Emergency On/Off switch should
only be used when it is required to shut the chiller off immedi-
ately. Power to all modules is interrupted when this switch is
off and all outputs from these modules will be turned off.
CH CH CH
17 16
J1
J2A
This switch is
221
221
100K
CH CH CH
CH CH CH
21 22
17 18 19 20
Fig. 18 — Energy Management Module
Energy Management Module (EMM) —
is available as a factory-installed option or as a field-installed
accessory. See Fig. 18. The EMM receives 4 to 20 mA inputs
for the temperature reset, cooling set point and demand limit
functions. The EMM also receives switch inputs for the field-
installed second stage 2-step demand limit and ice done func-
tions. The EMM communicates the status of all inputs with the
Touch Pilot module, and the controls adjusts the control point,
capacity limit, and other functions according to the inputs
received. See Table 10 for EMM board inputs and outputs.
Care should be taken when interfacing with other manufac-
turer's control systems due to possible power supply differ-
ences, full wave bridge versus half wave rectification,
which could lead to equipment damage. The two different
power supplies cannot be mixed. Touch Pilot
half wave rectification. A signal isolation device should be
utilized if a full wave bridge rectifier signal generating
device is used.
GREEN LED - LEN
(Local Equipment Network)
RED LED - STATUS
100K
CH
CH CH
8
24 25
CH
23
J2B J3
15
CAUTION
J9B J9A
100K
100K
100K
CH
CH
CH
11a
10
9
J4
The EMM
™ controls use
J8
J7B
J7A
J6
J5