Minutes Off Time; Capacity Control Overrides; Deadband Multiplier; First Stage Override/Slow Change Override - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

represents the amount of time to elapse before the unit will start
its initialization routine. This value can be zero without the
machine running in many situations. These can include being
unoccupied, ENABLE/OFF/REMOTE CONTROL switch in
the OFF position, CCN not allowing unit to start, Demand
Limit in effect, no call for cooling due to no load, and alarm or
alert conditions present. If the machine should be running and
none of the above are true, a minimum off time (DELY, see
below) may be in effect. The machine should start normally
once the time limit has expired.
MINUTES OFF TIME — The Minutes Off Time feature
 
(Configuration OPT2 DELY) is a user-configurable time
period used by the control to determine how long unit opera-
tion is delayed after the unit has been enabled. This delay is
initiated following the Enable-Off-Remote Switch being
placed in "Enable" position or "Remote" with remote contacts
closed, or if power is applied/restored to the unit with the En-
able-Off-Remote Switch in a position that would allow the unit
to operate. Typically, this time period is configured when mul-
tiple machines are located on a single site. For example, this
gives the user the ability to prevent all the units from restarting
at once after a power failure. A value of zero for this variable
does not mean that the unit should be running.
CEBD430351-0396-01C
J1
J2
J4 J3
J5
RED LED - STATUS
LEN
STATUS
J6
GREEN LED -
LEN (LOCAL EQUIPMENT NETWORK)
Fig. 13 — Energy Management Module
18
If Minutes Off Time is active, the control will indicate Op-
erating Mode, Minutes Off Time Active (Operating
 
Modes MODE MD10 will indicate YES).
CAPACITY CONTROL OVERRIDES — The
overrides will modify the normal operation of the routine.
Deadband Multiplier — The user configurable Deadband

Multiplier (Configuration
value of 1.0. The range is from 1.0 to 4.0. When set to other
than 1.0, this factor is applied to the capacity Load/Unload
Factor. The larger this value is set, the longer the control will
delay between adding or removing stages of capacity. Figure
14 shows how compressor starts can be reduced over time if
the leaving water temperature is allowed to drift a larger
amount above and below the set point. This value should be set
in the range of 3.0 to 4.0 for systems with small loop volumes.
First Stage Override — If the current capacity stage is zero,
the control will modify the routine with a 1.2 factor on adding
the first stage to reduce cycling. This factor is also applied
when the control is attempting to remove the last stage of
capacity.
Slow Change Override — The control prevents the capacity
stages from being changed when the leaving fluid temperature
is close to the set point (within an adjustable deadband) and
moving towards the set point.
J7
ADDRESS
DIP SWITCH
following

SLCT Z.GN) has a default
TEST 2