Units With Aquazone Deluxe D Control; Standby/Fan Only; Heating Stage 1; Emergency Heat - Carrier Aquazone 50HQP Series Installation, Start-Up And Service Instructions Manual

Units with Aquazone Deluxe D Control

STANDBY/FAN ONLY

The compressor will be off. The Fan Enable, Fan Speed, and re-
versing valve (RV) relays will be on if inputs are present.
NOTE: DIP switch 5 on S1 does not have an effect upon Fan 1
and Fan 2 outputs.

HEATING STAGE 1

In Heating Stage 1 mode, the Fan Enable and Compressor relays
are turned on immediately. Once the demand is removed, the re-
lays are turned off and the control reverts to Standby mode.

EMERGENCY HEAT

In Emergency Heat mode, the Fan Enable and Fan Speed relays
are turned on. The EH1 output is turned on immediately.

COOLING STAGE 2

In Cooling Stage 2 mode, the Fan Enable, compressor and RV re-
lays 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 when the thermo-
stat removes all Y2 call.

Retry Mode

In Retry mode, the staus LED will flash the code for the corre-
sponding fault. If the fault clears and the thermostat call (Y) is still
present the Complete C or Deluxe D control will run the compres-
sor once the ASC (anti-short cycle) timer has expired and will try
to satisfy the call. If the call is satisfied, the unit will resume its
normal operation.
If 2 or 4 consecutive faults occur (depending on the DIP switch
setting) within 1 hour, the controller will lock the compressor op-
eration out and will flash the alarm code on the status LED as well
as alarm dry contact output. When the Complete C or Deluxe D
control enters lockout mode, the alarm will also be shown on the
panel mounted LED.

Units with WSHP Open Controls with UPM Board

Units with WSHP Open still feature a UPM board (see Fig. 32) for
unit operation, so the operation will be similar to the sequence for
the Complete C and Deluxe D package. WSHP Open does feature
advanced functionality, such as automatic fan speed control and
intelligent alarming, which will differ from the Complete C and
Deluxe D packages. Below is an overview of the different features
for the WSHP Open controls. For more details of the WHSP Open
operation, please refer to the WSHP Open Integration Guide and
the WSHP Points/Properties Manual.

COOLING

The control will operate 1 or 2 stages of compression to maintain
the desired cooling setpoint. To improve dehumidification and re-
duce noise, the control operates the fan at the lowest speed possi-
ble to satisfy the load conditions. If cooling is active and should
the SAT approach the minimum SAT limit, the fan will be indexed
to the next higher speed. Should this be insufficient and if the SAT
falls further (equal to the minimum SAT limit), the fan will be in-
dexed to the maximum speed. If the SAT still continues to fall 5
degrees below the minimum SAT limit, all cooling stages will be
disabled.
During Cooling, the reversing valve output will be held in the
cooling position (either B or O type as configured) even after the
compressor is stopped. The valve will not switch position until the
opposite mode is required.

REVERSE CYCLE HEATING

The control will operate 1 or 2 stages of compression to maintain
the desired heating setpoint. To reduce noise, the control operates
the fan at the lowest speed possible. If the heating is active and
should the SAT approach the maximum SAT limit, the fan will be
indexed to the next higher speed. Should this be insufficient, then
if the SAT rises further and reaches the Maximum Heating SAT
limit, the fan will be indexed to the maximum speed. If the SAT
still continues to rise 5°F above the maximum limit, all heating
stages will be disabled.
During Heating, the reversing valve output will be held in the
heating position (either B or O type as configured) even after the
compressor is stopped. The valve will not switch position until the
opposite mode is required.

TWO POSITION OA DAMPER

The control can be configured to operate a two-position ventila-
tion damper to provide the minimum ventilation requirements
during occupied periods.

MODULATING OA DAMPER WITH DCV

The control can be configured to operate a modulating ventilation
damper during occupied periods that responds to changing CO
levels from an optional sensor. The control monitors the CO
and compares it to the configured setpoints and adjusts the ventila-
tion rate as required. The control provides proportional ventilation
to meet the requirements of ASHRAE specifications by providing
a base ventilation rate and then increasing the rate as the CO
increases. The control has 3 user adjustable setpoints; start ventila-
tion, maximum ventilation, and maximum damper position. The
control will begin to proportionally increase ventilation when the
CO level rises above the start ventilation setpoint and will reach
2
the full ventilation rate (maximum damper position) when the
CO level is at or above the maximum setpoint. A user configu-
2
rable minimum damper position insures that proper base ventila-
tion is delivered when occupants are not present.

AUXILIARY MODULATING HOT WATER / STEAM

HEATING REHEAT

The control can modulate a hot water or steam valve connected to
a coil on the discharge side of the unit and supplied by a boiler in
order to maintain the desired heating setpoint should the compres-
sor capacity be insufficient or a compressor failure occurs. Unless
the compressor fails, the valve will only operate to supplement the
heat provided by the compressor if the space temperature falls 2
degrees or more below the desired heating setpoint. The valve will
be controlled so the SAT will not exceed the Maximum Heating
SAT limit.
TWO-POSITION HOT WATER/STEAM
HEATING REHEAT
The control can operate a two-position, NO or NC, hot water or
steam valve connected to a coil on the discharge side of the unit
and supplied by a boiler in order to maintain the desired heating
setpoint should the compressor capacity be insufficient or a com-
pressor failure occurs. Unless the compressor fails, the valve will
only open to supplement the heat provided by the compressor if
the space temperature falls 2 degrees or more below the desired
heating setpoint. The valve will be controlled so the SAT will not
exceed the Maximum Heating SAT limit and subject to a 2 minute
minimum OFF time to prevent excessive valve cycling.
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