Carrier AQUAZONE 50KQL-1PD - Manual (Page 35)

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7. Optional Controls:
a. Unit-mounted ACO (automatic changeover)
thermostat operating controls shall consist of
temperature setting dial knob, push button
switches for Stop, Fan only, Hi fan, Lo fan.
Unit-mounted thermostats shall have a remote
sensor for sensing the return-air temperature.
b. Units designed for connection to remote wall
mounted thermostat shall be wired such that
the operating controls are at the thermostat.
The controller shall be provided with a low
voltage field wiring terminal block. The con-
trol scheme shall accommodate MCO or
ACO heat pump thermostats with Y, G, and
O outputs. An alternate controller shall be
available from the factory to accommodate
the Heat/Cool thermostats.
c. Motorized (2-way) water valves shall be
factory installed and wired. The valve shall
remain open when there is a cooling or
heating demand and the compressor is
running. The valve shall close when the
compressor stops after satisfying the
demand or due to lockout condition.
d. Fresh air dampers shall be motorized with a
spring return. The damper shall open when
Cooling or Heating mode selection is made
from the unit-mounted switches. With a
remote thermostat, the damper shall open
any time the fan is in operation.
e. Night low limit thermostats shall include a
unit-mounted thermostat sensing space tem-
perature. Should the space temperature fall
below the limit, the night low limit thermo-
stat shall start the fan and compressor oper-
ation in Heating mode.
f. Units with the unit-mounted thermostat shall
include a 2-hour override function. The
override switch shall be readily accessible. In
override mode the unit operation shall be
the same as in occupied mode. Override
mode shall be terminated automatically at
the end of a 2-hour period.
F. Electrical Requirements:
1. A control box shall be located within the unit
compressor compartment and shall contain a
50 va transformer, 24-volt activated, 3-pole
compressor contactor, terminal block for
thermostat wiring and solid-state controller for
complete unit operation. Electro-mechanical
operation WILL NOT be accepted.
2. Units shall be nameplated for use with time-
delay fuses or HACR circuit breakers.
3. Unit controls shall be 24-volt and provide heating
or cooling as required by the remote thermostat.
G. Special Features:
1. Aquazone™ Thermostat Controls (for use with
remote thermostat units):
a. Programmable multi-stage thermostat with
7-day clock, holiday scheduling, large backlit
display and remote sensor capability.
b. Programmable 7-Day Light-Activated Ther-
mostat offers occupied comfort settings with
lights on, unoccupied energy savings with
lights off.
c. Programmable 7-Day Flush-Mount Thermo-
stat offers locking coverplate with tamper
proof screws, flush to wall mount, dual point
with adjustable deadband, O or B terminal,
and optional remote sensor.
d. Programmable 5-Day Thermostat offers
2-stage heat, 2-stage cool, auto changeover,
5-minute built-in compressor protection, lock-
ing cover included.
e. Non-programmable Thermostat with 2 heat
stages, 2 cool stages, auto changeover,
5-minute built-in compressor protection, lock-
ing cover included.
2. Aquazone System Control Panel:
The panel shall coordinate, monitor, and con-
trol all WSHP units and ancillary equipment
including cooling towers, boilers, and system
pumps.
3. Fire-Rated Hose kits:
Hoses shall have a fixed MPT on one end and a
swivel with an adapter on the other end. Hose
kits shall be either stainless steel or galvanized.
4. Ball Valves (Brass Body):
Ball valves shall be for shutoff and balancing water
flow. Valves shall be available with memory,
memory stop, and pressure temperature ports.
5. Y Strainers (Bronze Body):
Strainers shall have “Y” type configuration with
a brass cap. Strainers shall have a maximum
operating pressure rating of 450 psi. Strainer
screen shall be made of stainless steel.
6. Solenoid Valves (Brass Body):
Valves shall provide slow operation for quiet
system application.
7. Hose Kit Assemblies:
Hose kits shall include a ported ball valve with
pressure temperature (P/T) plug ports, flexible
stainless steel hose with swivel and nipple.
Return hose includes a ball valve, preset mea-
sure flow (gpm) with two P/T ports, flexible
stainless steel hose with a swivel and nipple.
8. Remote Sensors:
Sensors for Aquazone flush-mount thermostats
shall be available.