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

Enable-Off-Remote Switch (SW1)

The position of the Enable-Off-Remote switch is ignored except
when the Remote control type is selected. Refer to the Machine
Control Methods section on page 25 for more details. A selection
for Machine Control Method must also be made along with the
correct position of the Enable-Off-Remote 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 ig-
nore the field-supplied Remote Contacts, enabling the unit all of
the time. When switched to the Off position, the chiller will shut
down if running. This allows for local (at the unit) override of the
Remote Contact input. When switched to the Remote position, a
field-installed dry contact can be used to start and stop 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 con-
figuration and set point data.

Emergency On/Off Switch (SW2)

This switch is installed in all units. The Emergency On/Off switch
should only be used when it is required to shut the chiller off im-
mediately. Power to all modules is interrupted when this switch is
off and all outputs from these modules will be turned off.

Energy Management Module (EMM)

The EMM is available as a factory-installed option or as a
field-installed accessory. See Fig. 21. When the EMM module
is field-installed, the Carrier Controller must be set up to com-
municate with the EMM module (Main Menu

tion Menu Factory Parameters

Module Yes). The Energy Management Module allows the
following functions:
• Chilled Water Temperature Reset — Resets the chilled wa-
ter set point by the following methods:
a. 4 to 20 mA Input: A field-supplied signal generator
and 1 / -watt, 250-ohm resistor are required.
2
b. Space Temperature: A field-supplied space tempera-
ture sensor is required.
• Demand Limit — Limits the capacity of the machine from
unit capacity by the following methods:

Configura-

Energy Management
221 221
CH CH CH
CH CH CH CH
17 18 19 20
17 16
J1
J2A
Fig. 21 — Energy Management Module
a. 4 to 20 mA Input: A field-supplied signal generator
and 1 /
b. 2 or 3-Step Switch Control: A field-supplied dry con-
tact switch is required. (One-Step Demand Limit does
not require the EMM.)
• Occupancy Override — Extends the occupied period for
machine operation. A field-supplied dry contact switch is
required.
• Remote Chiller Lockout — Disables the chiller when
closed. A field-supplied dry contact switch is required.
• Ice Done Control Switch — Signals the machine to exit
the Ice Build mode and enter an unoccupied time period. A
field-supplied dry contact switch is required.
The following status functions are available with the EMM board:
• Capacity Output Signal — A 0 to10 vdc analog output sig-
nal indicating chiller capacity is available.
• Shutdown Status Relay — A 24 vac output signal indicat-
ing that the machine is shutting down.
• Alert Relay — A 24 vac output signal indicating the unit
has an active alert.
• Compressor Run Status — A 24 vac output signal (one for
compressor A, one for compressor B), indicating the com-
pressor is on.
The EMM communicates the status of all inputs with the Carri-
er Controller module, and the controls adjusts the control point,
capacity limit, and other functions according to the inputs re-
ceived. See Table 12 for EMM board inputs and outputs.
Care should be taken when interfacing with other manufactur-
er's control systems due to possible power supply differences,
full wave bridge versus half wave rectification, which could
lead to equipment damage. The two different power supplies
cannot be mixed. Carrier Controller controls use 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
J9B
100K
100K
100K
CH
CH CH
CH
8 9
24 25
CH CH CH
21 22 23
J2B J3
18
-watt, 250-ohm resistor are required.
2
CAUTION
J9A
100K
J8
J7B
J7A
100K
J6
J5
CH
CH
11a
10
J4