Table 22 — Direct Expansion (DX) Cooling Test
KEYBOARD
ENTRY
DISPLAY
RESPONSE
COMMENTS/ACTION
NOTE: Only the configured number of stages are tested and appear on the display.
DX COOL
Entering field test DX cooling coil. (Set the HOA switch to AUTO.)
DXS1 X
STG1 TST
The fan starts. If fan has IGVs, the IGVs open to 30%. After an 11-second delay, the 1st stage of DX cooling
is turned ON.
DXS2 X
The 1st stage of DX cooling is turned OFF.
STG2 TST
After a 2-second delay, the 2nd stage of DX cooling is turned ON.
DXS3 X
The 2nd stage of DX cooling is turned OFF.
STG3 TST
After a 2-second delay, the 3rd stage of DX cooling is turned ON.
DXS4 X
The 3rd stage of DX cooling is turned OFF.
STG4 TST
After a 2-second delay, the 4th stage of DX cooling is turned ON
DXS5 X
The 4th stage of DX cooling is turned OFF.
STG5 TST
After a 2-second delay, the 5th stage of DX cooling is turned ON.
DXS6 X
The 5th stage of DX cooling is turned OFF.
STG6 TST
After a 2-second delay, the 6th stage of DX cooling is turned ON.
DXS7 X
The 6th stage of DX cooling is turned OFF.
STG7 TST
After a 2-second delay, the 7th stage of DX cooling is turned ON.
DXS8 X
The 7th stage of DX cooling is turned OFF.
STG8 TST
After a 2-second delay, the 8th stage of DX cooling is turned ON.
EXIT TST
The fan and preceding DX cooling stage shut OFF.
TST CMPL
Test is complete. The unit is back under automatic control.
Electronic Valve Actuator Field Test —
The elec-
trically operated valve actuators supplied with
1
⁄
2
-in. to
1
1
⁄
4
-in. valve assemblies are a hydraulic, linear-piston type.
The actuators supplied with the 1
1
⁄
2
-in. to 3-in. valve assem-
blies are an electro-mechanical type. Both types of actuators
contain a spring as part of the valve assembly. The spring
returns the stem to its normal position whenever there is a
loss of power or signal. Both actuators contain an internal
solid-state drive which accepts a proportional 4 to 20 mA
signal generated by the controller.
An increase in signal proportionally extends the actuator
shaft and pushes the valve stem down. A decrease in signal
retracts the actuator shaft and lifts the valve stem up. Valve
construction determines normal valve flow, either stem-up
open, or stem-up closed. On 3-way mixing valves, stem-up
allows flow from port B to port AB.
Perform field test for actuator as follows:
1. Verify actuator is powered by 24 vac at the WHITE/
BLUE and BLACK actuator wires.
2. Use a digital milliamp meter to verify the mA signal and
proper polarity at the input signal leads,
1
RED and
−GREEN. A digital volt meter with a minimum of 2-place
accuracy may be used to determine signal value, see
Table 23.
3. Enter the heating coil valve or cooling coil valve Quick
Test, retract the actuator shaft and completely lift valve
stem.
4. While still in Quick Test, press
. The actuator shaft
should extend completely, pushing valve stem down. Exit
Quick Test procedure.
Table 23 — Digital DC Volt Meter vs
DC Milliamp Meter
DC MILLIAMPS
DC VOLTAGE
4
.33
8
.57
12
.99
16
1.32
20
1.65
NOTE: The internal solid-state drives of the factory-supplied elec-
tronic actuators impose a 82.5 ohm impedance to the signal current
loop. A proportional voltage, ranging from 0.33 vdc at 4 mA to to 1.65 vdc
at 20 mA will be present.
CONTROL LOOP CHECKOUT
Checkout and adjustment of control loops should only
be performed by certified Carrier Comfort Network tech-
nicians. The following checkout procedure is offered as
a guide and presumes the user has obtained basic knowl-
edge of controls through CCN training.
To Check Operation of Analog Outputs —
The
control algorithms of the 39L and 39NX use the master/
submaster loop concept. The master loop monitors the mas-
ter sensor (the sensor which tries to maintain the desired set
point), and calculates the submaster reference required to do
so. The submaster loop monitors the submaster sensor and
controls the output to the controlled device. These algo-
rithms require a number of gain values to function properly.
The 39L and 39NX come with preset default values. How-
ever, it may be necessary to adjust several of these values to
achieve stable control. These values are submaster loop gain
(SMG), submaster loop center value (SCV), master loop pro-
portional gain (MPG) and, in some cases, master loop in-
tegral gain (MIG).
108
Summary of Contents for 39L Series
Page 9: ...Fig 6 PIC Section Control Box Component Arrangement 39NX Sizes 07 21 9...
Page 10: ...Fig 7 PIC Section Control Box Component Arrangement 39NX Sizes 26 92 10...
Page 13: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical 13...
Page 14: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 14...
Page 15: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 15...
Page 16: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 16...
Page 17: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 17...
Page 18: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 18...
Page 19: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical 19...
Page 20: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 20...
Page 21: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 21...
Page 22: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 22...
Page 23: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 23...
Page 24: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 24...
Page 25: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical 25...
Page 26: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 26...
Page 27: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 27...
Page 28: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 28...
Page 29: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 29...
Page 30: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 30...
Page 31: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box 31...
Page 32: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 32...
Page 33: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 33...
Page 34: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 34...
Page 35: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 35...
Page 36: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 36...