Thermostat Inputs; Complete C Control - Carrier AQUAZONE 50RHC Operating And Troubleshooting

HEATING STAGE 1 MODE --hi Heating Stage 1 mode, the
fan enable and compressor relays are turned on immediately.
Once the demand is removed, the relays are turned off and the
control reverts to Standby mode. If there is a master/slave or
dual compressor application, all compressor relays and related
functions will operate per their associated DIP switch 2 setting
on S 1.
HEATING STAGE 2 MODE -- In Heating Stage 2 mode, the
Fan Enable and Compressor relays lemain on. The fan speed
relay is turned on immediately and is turned off immediately
once the demand is removed. The control reverts to Heating
Stage 1 mode. If thele is a master/slave or dual compressor
application, all compressor relays and related functions will
operate per their associated DIP switch 2 setting on S 1. If con-
figured as Stage 2 (DIP switch SI position 2 is set to OFF)
then the compressor and fan will not turn until there is a call
for Stage 2.
HEATING STAGE 3 MODE -- In Heating Stage 3 mode, the
fan enable, fan speed and compressor relays will remain on.
The EHI output is turned on immediately. With continuing
Heat Stage 3 demmad, EH2 will turn on after 10 minutes. The
EHI and EH2 output signals _ue turned off immediately when
the Heating Stage 3 demand is removed. The control reverts to
Heating Stage 2 mode.
The EH2 output signal will be off if FPI is gleater than
45 F AND FP2 (when shorted) is greater thma 110 F during
Heating Stage 3 mode. This condition will have a 30-second
recognition time. Also, during Heating Stage 3 mode, EHI,
EH2, fan enable, mad fan speed will be ON if G input is not
active.
EMERGENCY HEAT MODE -- In Emergency Heat mode,
the fan enable mad fan speed rehtys _u'e turned on. The EHI
output is turned on immediately. With continuing Emergency
Heat demmad, EH2 will turn on after 5 minutes. Fan enable mad
fan speed relays are turned off after a 60-second delay. The
control reverts to Standby mode.
The EHI, EH2, fan enable, mad fan speed signals will be
ON if the G input is not active during Emergency Heat mode.
COOLING STAGE 1 -- In Cooling Stage 1 mode, the fan
enable, compressor and RV relays are turned on immediately.
If configured as stage 2 (DIP switch SI position 2 set to OFF)
then the compressor and fan will not tuna on until there is a
stage 2 demmad. The fan enable mad compressor relays are
turned off immediately when the Cooling Stage 1 demand is
removed. The control reverts to Standby mode. The RV relay
remains on until there is a heating demand. If there is a master/
slave or dual compressor application, all compressor relays and
related functions will track with their associated DIP switch 2
on S 1.
COOLING STAGE 2 -- In Cooling Stage 2 mode, the fan
enable, compressor and RV lelays remain on. The fan speed
relay is turned off immediately once the Cooling Stage 2
demand is removed. The control reverts to Cooling Stage 1
mode. If there is a master/slave or dual compressor application,
_fll compressor relays mad related functions will track with their
associated DIP switch 2 on S 1.
NIGHT LOW LIMIT (NLL) STAGED HEATING -- In NLL
staged Heating mode, the override (OVR) input becomes
active mad is recognized as a call for heating and the control
will immediately go into a Heating Stage 1 mode. With an
additional 30 minutes of NLL demmad, the control will go into
Heating Stage 2 mode. With another additional 30 minutes of
NLL demand, the control will go into Heating Stage 3 mode.
Thermostat Inputs
COMPLETE C CONTROL
Y and W Terminals -- Terminals Y and W have l-second
recognition time when being activated or removed.
O and G Terminals -- Terminals O and G are direct pass
through signals monitored by the microprocessol:
R and C Terminals -- Terminals R and C originate from the
trausforlllel:
ALl and AL2 Terminals -- Terminals ALl and AL2 origi-
nate from _darm relay.
Terminal A -- Tenninal A is pmalleled with compressor out-
put for use with well water solenoid valves.
Y 1/4 in. Quick Comaect -- The Y I/4 in. quick connect is for
factory use. It is used for panel mount relays such as loop pump
relay,
DELUXE D CONTROL (see Tables 8-10)
Y I -- Terminal YI is input for compressor stage 1 if DIP
switch 3 on SI is set to ON. If DIP switch is set to OFF, then
YI is input for Cooling Stage 1.
Y2 -- Terminal Y2 is input for compressor stage 2 if DIP
switch 3 on SI is set to ON. If DIP switch is set to OFF. then
Y2 is input for Cooling Stage 1.
W I- If terminals YI and Y2 abe active and DIP switch 3 on
S 1 is set to ON, then WI is input for Heating Stage 3. If YI and
Y2 me NOT active and DIP switch is set to ON, then WI is
input for Emergency Heat mode. If DIP switch is set to OFT,
then WI is input for Heating Stage 1 mode.
O/W2 -- If DIP switches 3 and 4 on S 1 are set to ON, termimd
O/W2 will be input for Reversing Valve (RV) relay. If DIP
switch 3 is OFT and DIP switch 4 is ON, O/W2 will be the
input for Heating Stage 2 mode.
If DIP switch 3 is ON and DIP switch 4 is OFE O/W2 will
be the input for Heat mode. In this mode, the thermostat out-
puts a B call when in Heating mode and does not have an
O output. The D control will employ RV control. This ensures
RV will only switch positions if the thermostat has a call for
heating/cooling mode change.
R and C Terminals -- Terminals R and C originate from the
trausfoHllel:
ALl and AL2 Terminals -- Terminals ALl and AL2 origi-
nate from ;darln relay.
G -- Input for fan enable relay.
NSB and Override -- When digital NSB is selected via the
accessory relay DIP switch and the NSB input is connected to
ground C, the appropriate accessory relay directly tracks the
NSB input.
When digital NSB is NOT selected via the accessory relay
DIP switch and the NSB input is NOT connected to ground C,
then all thermostat inputs me ignored. During this time period,
if OVR is momentarily comaected to 24 vac, then the thermo-
stat outputs are once again monitored for 2 hours. After the
2-hour override period, the Deluxe D control will assume NSB
is again connected to ground C and the control will revert back
to ignoring the thermostat inputs. There will be a random start
timer when coming back from NSB mode.
A maximum of 75 Deluxe D controllers can be
daisy-chained to the NSB terminals. The maximum total wire
resistance is 500 ohms.
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