Water-Cooled Units (30Hxc); Condenserless Units (30Hxa) - Carrier ComfortLink 6 Series Controls, Start-Up, Operation, Service, And Troubleshooting

The control will use the higher of the 2 Saturated Condens-
ing Temperature values for 30GXN,R080-160 units. For the
30GXN,R153, 163-350 units, each circuit's fan stages are
independently controlled based on the circuit's Saturated
Condensing Temperature. Refer to Table 9 for condenser fan
staging information.
WATER-COOLED UNITS (30HXC) — The 30HXC chiller
can be configured to control direct acting water valves that are
controlled by a 4 to 20 mA (2 to 10 vdc) signal. A 0 to 20 mA
(0 to 10 vdc) or 20 to 0 mA (10 to 0 vdc) can also be config-
1
ured. Installing a 500-ohm /
terminals of the mA signal enables the use of the vdc signal.
Set this configuration (VHPT, configuration mode under
sub-mode OPT1) to 1 (4 to 20 mA or 2 to 10 vdc), 2 (0 to
20 mA or 0 to 10 vdc), or 3 (20 to 0 mA or 10 to 0 vdc) as
desired depending on valve type. Signal connections are made
at terminal block TB2, terminals 14 and 15. The control
scheme reads the saturated condensing temperature and uses a
PID (proportional integral derivative) loop to control the head
pressure. Proportional, Integral and Derivative gain parameters
for the water-cooled controls are adjustable and can be found in
the SERV sub-mode under the Configuration mode. Only certi-
fied Carrier Comfort Network technicians should perform
checkout and adjustment of the PID loop.
CONDENSERLESS UNITS (30HXA) — The 30HXA unit is
often applied with an 09DK air-cooled condenser. The remote
condenser fans are controlled by 2 relay outputs. These
connections are in the 30HXA control box. See Field Wiring
section on page 72 for wiring details. The 30HXA control must
be configured to turn the 09DK fans on and/or off. To set the
30HXA control for this configuration, Unit Type (TYPE,
Configuration mode under sub-mode UNIT) must be config-
ured to 3 (Split System). The Head Pressure Control Type
UNIT CONFIGURATION OPTION
Head Pressure Control Type Method of controlling head
Fan Staging Select
Variable Head Pressure
30GX
Select
Head Pressure Control Type Method of controlling head pres-
Variable Head Pressure
30HXC
Select
Head Pressure Control Type Method of controlling head
30HXA
Variable Head Pressure
Select
*A vdc signal can be generated by installing a 500-ohm
watt resistor across the 2 output
2
Table 6 — Field Configured Head Pressure Control Options
DESCRIPTION
pressure
Method of controlling fan staging
Method of controlling variable head
pressure
sure
Method of controlling variable head
pressure
pressure
Method of controlling variable
head pressure
1
/ -watt resistor across the 2 output terminals of the mA signal.
2
(HPCT under sub-mode OPT1) must be configured to 1 (air-
cooled), and Condenser Pump control must be set to 0 (CNPC
must be set to No control, Configuration mode under sub-mode
OPT1).
Low ambient head pressure control can be accomplished
with fan cycling pressure switches (09DK054-094), tempera-
ture switches (09DK044, 074-094), and Motormaster®
control. The Motormaster control requires a temperature sensor
input to control condenser fan cycling. The Motormaster V
control also requires a temperature sensor input or the 4 to
20 mA output signal from the Comfortlink™ control system.
See accessory installation instructions for further information.
The Head Pressure Control Type (HPCT under sub-mode
OPT1) may be set to control various types of head pressure
control devices. HPCT may be set to 0 (No Control), 1
(Air Cooled), 3 (Common Condenser), or 4 (Independent
Condenser).
The 30HXA chillers also support the use of a 4 to 20 mA
(2 to 10 vdc), 0 to 20 mA (0 to 10 vdc), or 20 to 0 mA (10 to
0 vdc) for fan speed control. Installing a 500-ohm
resistor across the 2 output terminals of the mA signal enables
the use of the vdc signal. Set this configuration (VHPT, config-
uration mode under sub-mode OPT1) to 1 (4 to 20 mA or 2 to
10 vdc), 2 (0 to 20 mA or 0 to 10 vdc), or 3 (20 to 0 mA or 10
to 0 vdc) as desired depending on control type. For common
output applications (single output for both circuits), the signal
connections are made at terminal block TB2, terminals 14 and
15. For independent (one output for each circuit) applications,
the signal connections are made at terminal block TB2, termi-
nals 14 and 15 for circuit A, and terminals 12 and 13 for
circuit B.
POINT NAME
HPCT Air Cooled (30GX Default, Do not modify)
FAN.S See Table 7
VHPT 0 = None (Default)
1 = 4 to 20 mA (Default if Motormaster FIOP is
installed.)
Set to 4 to 20 mA if Motormaster accessory is
installed.
HPCT Water Cooled (30HXC Default, Do not modify)
VHPT 0=None
1 = 4 to 20 mA (*2 to 10 vdc)
2 = 0 to 20 mA (*0 to 10 vdc)
3 = 20 to 0 mA (*10 to 0 vdc)
HPCT No Control
Air Cooled (30HXA Default)
Common Condenser
Independent Condenser
VHPT 0=None
1 = 4 to 20 mA (*2 to 10 vdc)
2 = 0 to 20 mA (*0 to 10 vdc)
3 = 20 to 0 mA (*10 to 0 vdc)
12
1
FACTORY CONFIGURATION
/ watt
2