Carrier 50KQA Product Data page 37

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 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.
g. The unit shall be provided with a factory-
wired cord and plug set conforming to
NEMA (6-20P, 7-20P, or 6-30P).
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,
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 heat-
ing 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.
terminal block for
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
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 mem-
ory, 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.
9. PremierLink™ accessories:
PremierLink accessories shall provide a fully
integrated DDC system. Accessories include
supply air temperature sensors, communicating
room sensors, CO sensors, and linkage ther-
2
mostats.
Thermostat offers
37