Operation; Power Up Mode; Units With Aquazone Complete C Control; Units With Aquazone Deluxe D Control - Carrier Aquazone 50RHE 006 Installation, Operation And Maintenance Instructions

7 - OPERATION

7.1 - Power up mode

The unit will not operate until all the inputs, terminals and
safety controls are checked for normal operation.
NOTE: The compressor will have a 5-minute anti-short cycle
upon power up.

7.2 - Units with Aquazone Complete C control

7.2.1 - Standby
Y and W terminals are not active in standby mode, however the
O and G terminals may be active, depending on the application.
The compressor will be off.
7.2.2 - Cooling
Y and O terminals are active in cooling mode. After power up, the
first call to the compressor will initiate a 5 to 80 second random
start delay and a 5-minute anti-short cycle protection time delay.
After both delays are complete, the compressor is energised.
NOTE: On all subsequent compressor calls the random start
delay is omitted.
7.2.3 - Heating stage 1
Terminal Y is active in heating stage 1. After power up, the first
call to the compressor will initiate a 5 to 80 second random start
delay and a 5-minute anti-short cycle protection time delay.
After both delays are complete, the compressor is energised.
NOTE: On all subsequent compressor calls the random start
delay is omitted.
7.2.4 - Heating stage 2
To enter stage 2 mode, terminal W is active (Y is already active).
Also, the G terminal must be active or the W terminal is dis-
regarded. The compressor relay will remain on and EH1 is
immediately turned on. EH2 will turn on after 10 minutes of
continual stage 2 demand.
NOTE: EH2 will not turn on (or if on, will turn off) if FP1 tem-
perature is greater than 7.2
7.2.5 - Emergency heat
In emergency heat mode, terminal W is active while terminal Y is
not. Terminal G must be active or the W terminal is disregarded.
EH1 is immediately turned on. EH2 will turn on after 5 minutes
of continual emergency heat demand.

7.3 - Units with Aquazone Deluxe D control

7.3.1 - Standby/fan only
The compressor will be off. The fan enable, fan speed and reversing
valve (RV) relays will be on if inputs are present. If there is a fan 1
demand, the fan enable will immediately turn on. If there is a fan 2
demand, the fan enable and fan speed will immediately turn on.
NOTE: DIP switch 5 on S1 does not have an effect upon fan 1
and fan 2 outputs.
7.3.2 - Heating stage 1
In heating stage 1 mode, the fan enable and compressor relays
are turned on immediately. Once the demand is removed, the
24
°
C and FP2 is greater than 43.3
relays are turned off and the control reverts to standby mode. If
there is a master/slave or dual compressor application, all com-
pressor relays and related functions will operate per their asso-
ciated DIP switch 2 setting on S1.
7.3.3 - Heating stage 2
In heating stage 2 mode, the fan enable and compressor relays are
remain on. The fan speed relay is turned on immediately and
turned off immediately once the demand is removed. The control
reverts to heating stage 1 mode. If there is a master/slave or dual
compressor application, all compressor relays and related func-
tions will operate per their associated DIP switch 2 setting on S1.
7.3.4 - Heating stage 3
In heating stage 3 mode, the fan enable, fan speed and compressor
relays remain on. The EH1 output is turned on immediately. With
continuing heat stage 3 demand, EH2 will turn on after 10 minutes.
EH1 and EH2 are turned off immediately when the heating stage 3
demand is removed. The control reverts to heating stage 2 mode.
Output EH2 will be off if FP1 is greater than 7.2°C and FP2
(when shorted) is greater than 43.3°C during heating stage 3
mode. This condition will have a 30-second recognition time.
Also, during heating stage 3 mode, EH1, EH2, fan enable and
fan speed will be ON if G input is not active.
7.3.5 - Emergency heat
In emergency heat mode, the fan enable and fan speed relays
are turned on. The EH1 output is turned on immediately. With
continuing emergency heat demand, EH2 will turn on after 5
minutes. Fan enable and fan speed relays are turned off after a
60-second delay. The control reverts to standby mode.
Output EH1, EH2, fan enable and fan speed will be ON if the G
input is not active during emergency heat mode.
7.3.6 - 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
set to OFF) then the compressor and fan will not turn on until there
is a stage 2 demand. The fan enable and compressor relays are
turned off immediately when the cooling stage 1 demand is re-
°
C. moved. 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 S1.
7.3.7 - Cooling stage 2
In cooling stage 2 mode, the fan enable, compressor and RV relays
remain on. The fan speed relay is turned on immediately and
turned off immediately once the cooling stage 2 demand is re-
moved. The control reverts to cooling stage 1 mode. 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 S1.
7.3.8 - Night low limit (NLL) staged heating
In NLL staged heating mode, the override (OVR) input becomes
active and is recognised as a call for heating and the control will
immediately go into a heating stage 1 mode. With an additional
30 minutes of NLL demand, 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.