11
Table 6 — Field Configured Chiller Options
Table 7 — Fan Staging Settings for Air Cooled (30GX) Units
LEGEND
SCT — Saturated Condensing Temperature
WATER-COOLED UNITS (30HXC) — The 30HXC chillers
can be configured to control direct or reverse-acting water
valves that are controlled by a 4 to 20 mA signal. A 2 to10 vdc
signal can be used by installing a 500-ohm
1
/
2
watt resistor
across the 2 output terminals of the 4 to 20 mA signal. The 4 to
20 mA control scheme reads the saturated condensing temper-
ature and uses a PID (proportional integral deriative) 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 Service subfunction. Checkout and
adjustment of the PID loop should only be performed by certi-
fied Carrier Comfort Network technicians.
CONDENSERLESS UNITS (30HXA) — The remote con-
denser fans are controlled by 2 relays with the 30HXA control
box. See Field Wiring section on page 73 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 under
must be changed to 3 (Split System).
Next, under
, Head Pressure Control Type must be
changed to 1 (Air Cooled), and Condenser Pump control must
be set to 0 (Not Controlled).
The 30HXA control does not support a 4 to 20 mA or a 2 to
10 vdc output for fan speed control. Instead, head pressure con-
trol is accomplished with fan cycling pressure switches
(09DK054-094), temperature switches (09DK044, 074-094)
and Motormaster control. Motormaster and Motormaster III
control is used with temperature sensor input to control con-
denser fan speed. See accessory installation instructions for
further information.
09DK CONDENSING UNITS
09DK044 Units — The 09DK044 units have accessory provi-
sion for fully automatic intermediate-season head pressure
control through condenser fan cycling. Fan number 2 and 3
cycling is controlled by outdoor-air temperature through air
temperature switches (ATS) 1 and 2.
The air temperature switches are located in the lower divid-
er panel underneath the coil header. The sensing element is ex-
posed to air entering the no. 1 fan compartment through a hole
in the panel. Fan no. 1 is non-cycling.
The air temperature switch controls the fans as shown in
Table 9.
09DK054-094 — The capacity of an air-cooled condenser in-
creases with increased temperature difference (defined as satu-
rated condenser temperature minus entering outdoor-air tem-
perature) and decreases with decreased temperature difference.
A drop in entering outdoor-air temperature results in a lower
saturated condensing temperature. When outdoor-air tempera-
ture drops below the minimum temperature for standard units,
additional head pressure control is required.
Model 09DK units have fully automatic intermediate-
season head pressure control through condenser fan cycling
using electromechanical fan cycling controls. Standard head
pressure controls regulate the 100 and 50/50% condenser
capacity applications. Head pressure can also be controlled
by fan cycling controls supplemented by the accessory
Motormaster III solid-state head pressure control. See Motor-
master
III installation instructions for more information.
In the standard control scheme, fans 1 and 2 are on when
there is a call for cooling from the respective coil circuits. Fans
1 and 2 are non-cycling. On 054 and 064 units, fans 3 and 4 are
controlled by using a fan cycling pressure switch on each of the
primary coil circuits in response to condensing pressure. On
074-094 units, fans 3 and 4 are controlled using a fan cycling
pressure switch in each of the primary coil circuits in response
to condensing pressure. Fans 5 and 6 are controlled by using
two air temperature switches, which respond to the outdoor
ambient temperature. The air temperature switches are located
on the control box shelf.
UNIT
CONFIGURATION OPTION
DESCRIPTION
HSIO LOCATION
FACTORY CONFIGURED?
30GX
Fan Staging Select
Air cooled staging method
Yes. See Table 7
Motormaster® Control Select
Applies to air cooled units only
Yes. 0 = None
Set to 1 to enable (Motormaster only)
30HXC
Water Valve Type
Applies to water cooled unit only
Yes. 0 = None
Set to 1 = 4 to 20 mA, 2 = 2 to 10 V,
3 = 20 to 4 mA, 4 = 10 to 2 V
UNIT 30GX
DESCRIPTION
OPTION NUMBER
HSIO DISPLAY
080-105
1st stage compressor status and SCT set point
2nd stage common control based on highest SCT
12
Com_1cmp
106-125
1st stage compressor status and SCT set point
2nd and 3rd stage common control based on highest SCT
14
Com_2cmp
136, 150, 160
1st stage compressor status and SCT set point
2nd through 4th stage common control based on highest SCT
16
Com_3cmp
151, 161, 175,
205, 225
1st stage each circuit, compressor status
2nd stage Circuit B independent
2nd and 3rd stage Circuit A independent
7
A2B1_stg
176
1st stage each circuit, compressor status
2nd and 3rd stage each circuit independent
3
Ind_2stg
206, 226, 250
1st stage each circuit, compressor status
2nd stage Circuit B independent
2nd, 3rd and 4th stage Circuit A independent
9
A3B2_cmp
251-350
1st stage each circuit, compressor status
2nd, 3rd and 4th stage each circuit independent
5
Ind_3stg
