Trane RTHC-SVN02C-EN User manual

© 2003 American Standard Inc. All rights reserved.
Installation
RTHC
Condenser Water Regulating Valve Option
Order Number: RTHC-SVN02C-EN Date: June 2003
Pueblo Built Units Only
Introduction
To satisfy system oil protection safeties and to maximize energy efficiency, adequate
condenser water control on the RTHC units is necessary. The required system
differential (condensing pressure minus evaporator pressure) is 25 psid for all RTHC
units. This differential must be maintained at all load conditions and must be achieved,
following a start-up, within 2 minutes.
On start-up, the system differential must be at least 8 psid within 20 seconds, which
generally equates to the condenser leaving water temperature being equal to or
greater than the evaporator leaving water temperature. The system also must achieve
a leaving condenser water temperature 25 F higher than the evaporator leaving water
temperature within 2 minutes from start-up and maintain thereafter.
To maintain proper oil flow to the compressor, strict condensing water control is
necessary. One method of achieving this control is through the installation of an
optional water regulating valve.
NOTICE: Warnings and Cautions appear at appropriate sections
throughout this literature. Read these carefully.
WARNING: Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
 CAUTION: Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may also be used to
alert against unsafe practices.
CAUTION: Indicates a situation that may result in equipment or property-
damage only accidents.

2RTHC-SVN02C-EN
Discussion
The purpose of this manual is to outline the installation and setup procedures for the
regulating valve and the associated controller for optimal condensing water control.
The condenser water regulating valve option can be ordered with or without the water
regulating valve. Just the controls and pressure transducers can be ordered if an valve
and electric actuator are already available . This manual will cover installation of the
water regulating valve, the controller and the pressure transducers.
Condenser Water Regulating Valve
The optional condenser water regulating valve is produced by Center Line. Below is a
basic installation procedure for installing the valve. For detailed instructions, refer to
the “Center Line Installation and Maintenance Instructions for UL Approved Valves”
found on the internet at http://www.cranevalve.com.
Water Valve Rating
Confirm that the correct valve was shipped by referring to the Center Line nameplate
attached to the valve body. Refer to Table 1 for the list of valves available.
Installation Tools
A hoist will be necessary to manipulate the valve into place and a wrench suitable for
tightening the flange bolts and/or nuts. Temporary pipe supports maybe used to keep
flange faces parallel during installation.
Table 1 Valves Available
Trane Part Number Crane Series Number
Rating
(PSIG)
Actuator
Voltage (AC)
Valve Size
(inches)
VAL06912 06B1021319-44300M-20A 200 115 6
VAL06913 08B1021319-44300M-20B 200 115 8
VAL06914 06B1021319-44300M-20A-220VAC 200 220 6
VAL06915 08B1021319-44300M-20B-220VAC 200 220 8
VAL06916 06M2521319-44300M-20A 300 115 6
VAL06917 08M2521319-44300M-20B 300 115 8
VAL06918 06M2521319-44300M-20A-220VAC 300 220 6
VAL06919 08M2521319-44300M-20B-220VAC 300 220 8

RTHC-SVN02C-EN 3
Condenser Water Regulating Valve
Installation
It is recommended that the valve be installed downstream of the condenser to insure
undisturbed flow into the condenser. Also insure that the condenser does not drain
when the valve is shut off and or when the water pump is off. Drainage of the
condenser will increase tube fouling.
 WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power before servicing could
result in death or serious injury.
1. Inspect the valve for the proper rating.
2. Remove the protective flange covers from the valve.
3. Ensure the valve is free of shipping defects.
4. Be certain the waterway is free of all debris.
5. Almost close the valve prior to installing to avoid damage to the disc or seat of
the valve. Refer to Figure 1.
6. The valve can be installed at any angle; therefore it is recommended that the
indicator and controller be positioned so that it can be read and adjusted, if
necessary.
7. Place the valve between the flanges. Do not use any gasketing material. The
elastomer seat extends beyond the valve seat and provides a leak proof seal
between the valve and the mating pipe flange faces.
Important: Gaskets are not needed and should not be used when the valve is
installed between standard weld neck or slip-on type flanges.
8. Install all bolts between the valve and the mating flanges. Hand tighten all bolts
as necessary.
9. Torque the bolts in the sequence outlined in Figure 2 and to the value listed in
Table 2.
10. Verify full stroke operation with the manual crank and rotation indicator.
Figure 1 Correct Position of the Valve Seat

4RTHC-SVN02C-EN
CAUTION
Equipment Damage!
Do not manually crank the valve with power applied. Damage will occur to the
valve or the actuator.
Table 2 Water Regulating Valve Installation Information
Valve
Size
Valve psig
Rating
Number of Bolts
Required
Thread Size
(inches)
Bolt Length
(inches)
Required Torque
(ft-lbs)
6 200 8 3/4 - 10 2 25-100
8 200 8 3/4 - 10 2 25-100
6 300 12 3/4 - 10 2 1/2 25-100
8 300 12 7/8 - 9 2 3/4 50-200
NOTE: Bolting and Torquing recommendations are made without a warranty, and apply only to steel weld-neck or slip-on flanges. The use of lock
washers and/or lubrication with the bolting will affect stated torque values.
Figure 2 Bolt Torquing Sequence
15
9
3
7
11
2
6
10
4
8
12
1
2
3
4
5
6
7
81
2
3
4

RTHC-SVN02C-EN 5
Set-up of Electric Valve Actuator
The electronic actuator supplied with the water regulating valve is produced by Crane.
The actuator will come already mounted on the valve and factory set. For detailed
instructions, refer to the “Electronic Control Actuator, Series 44000M, Operation
Manual” released by Crane.
Factory Settings
CAUTION
Equipment Damage!
The actuator is intended for indoor use. Special precautions must be taken if
the actuator will be exposed to rainwater or direct sunlight. Failure to
adequately protect actuator may result in equipment damage.
Several potentiometers are factory set. The settings should not need adjusting in
most applications but are field adjustable if required. Refer to Figure 3.
Figure 3 Valve Actuator
123123123123123123
123123123123123123
OPEN STOP CLOSE
DIRECT
ACTION
REVERSE
ACTION
+--
+
INPUT AC xxx V OUTPUT
++++++
123123
Zero
Span
Sensitivity

6RTHC-SVN02C-EN
The actuator is factory set with a “close limit” of 15 degrees open. The “open limit” is
factory set for 90 degrees open.
NOTE: The “close limit” of 15 degrees open is a nominal opening for a typical system
with typical pressure drops.
“Zero” and “Span” are used to adjust the corresponding mA signal. “Zero” is factory
set such that 4 mA corresponds to 15 degrees open and 20 mA corresponds to 90
degrees open.
The “Sensitivity” is factory set to allow the valve to operate with the largest allowable
number of steps. If the valve appears to sluggish the sensitivity may need to be
decreased.
CAUTION
Equipment Damage!
Valve should be adjusted such that overheating of the condenser water pump
does not occur at reduced flows. It is recommended that the flow rates remain
above 25% of the flow at the best efficiency point. Failure to properly adjust
regulating valve may result in equipment damage.
Important: An improperly sized water valve can result in unstable operation and
throttling difficulties. Follow the valve manufacturer’s guidelines when sizing the
valve.

RTHC-SVN02C-EN 7
Mounting the 4U1 (ASM) Module
UCP2 does not have software capabilities to operate a water regulating valve;
therefore an additional controller is required to monitor the system pressures and
adjust the position of the water valve accordingly. The 4U1 controller is the additional
controller required. It is an adder subtractor module (ASM) manufactured by Moore
Industries Inc. and is a special design for Trane. It is not Moore’s standard ASM
module.
On factory installations, the 4U1 controller is mounted on the bracket between the
evaporator and condenser, above the system differential pressure switch.
This module is mounted in a sheet metal box and is labeled “ASM Adder Subtractor
Module”. The module will accept the input from two pressure transmitters, one on the
evaporator and one on the condenser. It subtracts the two values to determine the
system differential. The module will then produce either a 4-20 mA or 1-5 VDC signal
output to be wired to the actuator on the water valve.
If the controller is not factory installed, use the procedure below to mount the
controller.
Installation
1. Locate the factory mounted pressure differential switch for detecting low
system differential. It is located on the left side of the unit while facing the
control panel, between the evaporator and condenser.
2. Above the switch, mount the 4U1 module to the bracket, facing outward. Use
four 10-32 x 1" screws and four 10-32 nuts.
3. On the left side of the 4U1 box, press out one of the electrical knock-outs and
install one of the bushing strain reliefs (X1910-0028-350) in the opening.
4. On the right side of the 4U1 box, press out one of the electrical knock-outs and
install one of the bushing strain reliefs (X1910-0028-350) in the opening. This
should be level with the knock-out on the left side.
5. On the right side of the 4U1 box, above the strain relief already installed, press
out one of the electrical knock-outs and install the final bushing strain relief
(X1906-0094-010) in the opening.
6. The module is shipped with a resistor between (+) Out and (-) Out terminals to
supply a 1 to 5 VDC output signal. If a 4-20 mA output signal is required, the
resistor between (+) Out and (-) Out must be removed and discarded.

8RTHC-SVN02C-EN
Mounting of the Pressure Transducers
A Danfoss pressure transmitter needs to be installed on the evaporator and the
condenser to feed the system pressures to the 4U1 module.
Installation
To install the transmitters to both the evaporator and the condenser, follow the
procedures below.
1. Locate the two transducers, X1379-0359-010.
2. Locate the two 1/4” flare unions, X1719-0047-010.
3. Tighten one union to each transducer.
4. Close the service valve on the evaporator and condenser where the transducers
will be installed.
5. Install one of the transmitters to condenser service valve located on the top of
the shell.
NOTE: Install a schrader tee prior to the transducer, if an access port is desired.
6. Install one of the transducers on the evaporator service valve located on top of
the shell.
NOTE: Install a schrader tee prior to the transducer, if an access port is desired.
7. Open all service valves and insure all connections are leak free.
8. Run the electrical leads of the transducers to the 4U1 controller. Wire according
to the next section.
Figure 4 4U1 (ASM) Mounting and Wiring

RTHC-SVN02C-EN 9
Wiring
Wiring can be completed once all of the components are installed.
 WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power before servicing could
result in death or serious injury.
Connecting Supply Voltage to the 4U1
The controller requires 24 VAC to operate.
Note: If the module is factory installed, the power supply wiring will already be
connected.
1. To connect the power to the module, use four-lead conductor wire, (X1906-0094-
010).
2. Connect the red lead to the J2-4 on the 1U2 starter module.
3. Connect the black lead to the J2-3 on the 1U2 starter module.
4. Connect the other end of red lead to ACC in the 4U1 controller.
5. Connect the other end of the black lead to AC in the 4U1 controller.
NOTE: Conduit is not required. Four-lead conductor wire is to be used X1906-
0094-010. Trim the two additional wires.
Wiring the Pressure Transducers to the 4U1 Module
1. The transducer ships from the supplier with a four-wire cable and a ground. Only
2 wires and the ground will be used. Install a fork connector to the black lead,
red lead and the ground. The white and green leads are not used and can be cut
back out of the way.
2. Prepare the wire leads for both transducers.
3. Feed the leads through the lower bushing strain reliefs installed in the sheet
metal box.
4. Connect the black lead of the transducer installed on the condenser to S1 - 4U1.
5. Connect the red lead of the transducer installed on the condenser to TX1 - 4U1.
6. Connect the ground of the transducer installed on the condenser to GND - 4U1.
7. Connect the black lead of the transducer installed on the evaporator to S2 - 4U1.
8. Connect the red lead of the transducer installed on the evaporator to TX2 - 4U1.
9. Connect the ground of the transducer installed on the evaporator to GND - 4U1.
Connect the 4U1 Output to the Water Valve
The wiring between the 4U1 controller and the water valve is customer supplied. It is
class 2 wiring. It should not be run in conduit with higher voltage wire.
Important: To avoid erratic control of the valve, do not run the signal wire between
the 4U1 controller and the water valve in conduit with voltages higher than 30 volts.

10 RTHC-SVN02C-EN
4-20 mA Signal
1. Remove the 250 ohm resistor, factory mounted on the 4U1 module between
the -Output and +Output.
2. Connect the first wire between the +Output on the 4U1 controller and the
Input (+) on the actuator.
3. Connect the second wire between the -Output 4U1 controller and Input (-) on
the actuator.
Note: If the water valve and actuator were not ordered, the signal can also be
used by a BAS system.
1-5 VDC Signal
1. Confirm the connection of the 250 ohm resistor, factory mounted on the 4U1
module between the -Output and +Output.
2. Connect to +Output on the 4U1 controller and Input (+) on the actuator.
3. Connect the second lead to -Output 4U1 controller Input (-) on the actuator.
Note: If the water valve and actuator were not ordered, the signal can also be
used by a BAS system.
Connecting Supply Voltage to the Water Valve
Actuator
The power supply for the valve actuator is customer supplied. For 115 VAC
applications, #14 AWG 600V wire is needed.
Connect the customer supplied voltage to terminal points labeled “XXX” ACV on the
right side of the actuator. Refer to Figure 5.
Figure 5 Wiring Schematic
1U2 Starter
Module J2
1
2
3
4
4U1 ASM Module
S1
S2
-S
ACC
AC
GND
S3
TX1
-S
TX2
+OUT
-OUT
Valve Actuator
INPUT ACxxxV OUTPUT
+-+-
Customer Supplied
115 VAC or 230 VAC
condenser
pressure transducer
4R1
(red)
(blk)
evaporator
pressure transducer
4R2
(red)
(blk)
(braided)
(braided)

RTHC-SVN02C-EN 11
Start-up
It is recommended that the steps below are followed once the installation is
complete to insure proper operation.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power before servicing could
result in death or serious injury.
1. Remove line power from valve. Manually crank condenser valve wide open. Set
condenser flow valve to obtain max water flow (correct pressure drop) per IOM.
2. Configure with chiller OFF, condenser pump ON. Apply line power to valve, it
should move to 15% open. Remove power from valve.
3. Measure water pressure drop across condenser. It should be 0.7 ft to 2.0 ft for
C1, C2, D1, D2, E1, E2, F2 and F3 condensers and 0.4 ft to 1.0 ft for BI, B2, E3,
Fl, Gl, G2 and G3 condensers. Go to step 7, if water side pressure drop is
correct.
4. If pressure drop is not as described in step 2, remove line power from valve,
manually adjust valve opening with attached crank until proper condenser
pressure drop is obtained. Mark pointer location. Reset closed limit microswitch
to trip at this location / pressure drop.
5. Leave transducer 4R1 connected to condenser pressure and arrange so
transducer 4R2 can be connected to either atmospheric or above 70 psi. Apply
24 VAC to 4U1 and line power to valve. Stroke valve open and closed by applying
and removing pressure to 4R2.
6. Adjust valve closed position with zero adjustment so it coincides with closed
limit switch trip point that was adjusted in step 4. Cycle valve open by increasing
pressure to 4R2. It should be full open at 60 to 70 psid. Adjust span if not.
Recheck zero, if span is adjusted.
Warning
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it
may be necessary to work with live electrical components. Have a qualified
licensed electrician or other individual who has been properly trained in
handling live electrical components perform these tasks. Failure to follow all
electrical safety precautions when exposed to live electrical components could
result in death or serious injury.
7. Let condenser pump run for at least 15 minutes with motorized valve in closed
position. Verify that pump doesn't overheat when throttled. Check that
condenser flow switch makes with this low flow. Disconnect flow switch or use
a pressure switch if flow switch can't be adjusted low enough.
8. Verify operation during a normal start. If valve overshoots and then re-closes,
increase damping on the 4U1 module. Valve should open and close as shown in
Figure 6.

12 RTHC-SVN02C-EN
Troubleshooting Procedures
This section offers some basic troubleshooting for the modules and components
associated with the condenser water regulating valve option.
4U1 ASM Module Checkout
Warning
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it
may be necessary to work with live electrical components. Have a qualified
licensed electrician or other individual who has been properly trained in
handling live electrical components perform these tasks. Failure to follow all
electrical safety precautions when exposed to live electrical components could
result in death or serious injury.
During installation, testing, servicing and troubleshooting of this product, it may be
necessary to work with live electrical components. Have a qualified licensed
electrician or other individual who has been properly trained in handling live electrical
components perform these tasks. Failure to follow all electrical safety precautions
when exposed to live electrical components could result in death or serious injury.
1. To perform this checkout, leave all power applied and all pressure transducers
connected.
2. First, check the power supply to the 4U1 module. Measure the VAC across AC
and ACC on the 4U1 board. It should be 24 VAC.
3. Measure the voltage between “TX1” and “-S” on the 4U1 module. The voltage
should be 25 VDC.
4. Measure the voltage between “TX2”and “-S” on 4U1 module. The voltage
should be 25 VDC.
5. If the supply voltages are out of range, check and tighten all the connections
between the 4U1 module and the 1U2 module.
6. If the voltages are still out of range, check the 1U2 module. Replace the 1U2
module if necessary.
7. Once the supply voltage is within range, the 4U1 module can be checked.
Figure 6 4U1 Output Signal
0
4
20
mA
VDC
5
1
0035 70 PSID

RTHC-SVN02C-EN 13
8. The 4U1 - ASM Module subtracts the signal from the evaporator transducer
from the signal from the condenser transducer. Record the actual evaporator
and condenser pressures of the unit.
9. Subtract and record the actual pressures to determine the system differential
(psid).
10. A 250 ohm resistor should be connected between “+OUT” and “-OUT” for 1 to
5 VDC signal. This resistor needs to be added it using the 4-20 mA signal to
control the valve
11. Record the VDC output signal by measuring across “+OUT” and “-OUT”.
12. Refer to the graph to compare the recorded values in steps 8 and 9. Refer to
Figure 6.
13. If the values are out of range, check the 250 ohm resister and then proceed with
the “Pressure Transducer Checkout”.
Pressure Transducer Checkout
1. Manually read and record the actual pressure of the either the condenser or
evaporator.
2. With the transducer connected to the 4U1, measure the voltage across S1 and
-S, for the condenser transducer. Measure across S2 and -S, for the evaporator
transducer.
3. Compare the voltage reading to the graph in figure 7. The converted pressure
should be + 5% of the reading recorded in step 1.
4. If the reading is out of range, disconnect the transducer from the condenser or
the evaporator and attach a tank of nitrogen with a pressure regulator to the
transducer. Increase the pressure to 50 psi and hold the pressure.
5. With pressure applied to either transducer, the output voltages, measured
between S1 and -S for the condenser or S2 and -S for the evaporator, should be:
50 psi applied should equal an output voltage of 1.96 VDC
75 psi applied should equal an output voltage of 2.48 VDC
100 psi applied should equal an output voltage of 2.95 VDC
The voltage can vary ±10%. The input resistor should be 250 ohms.
6. If the voltage is out of range, replace the transducer.
7. If the voltages are within range but the valve is not responding properly, check
the mechanical operation of the water regulating valve and the operation of the
electrical actuator.

14 RTHC-SVN02C-EN
Figure 7 Pressure Transducer Graph
0
20
40
60
80
100
120
140
7.1
7.84 8.65 9.35 9.66 10.9
11.48 12.36 13.06
mA
Pressure
Table 3 Troubleshooting Table
Problem Possible Causes
Water valve won’t modulate • mechanical failure of valve
• failure of valve actuator
• incorrect signal sent by 4U1 (ASM) module
• failure of one or both of the pressure transducers
• incorrect power supply
• loose connections
Valve opening unstable • noise on signal line
• potentiometer loose on 4U1 module (tighten set screws)
• system water pressure incorrect
• factory settings on valve actuator need to be adjusted
Valve opening does not match
input signal
• incorrect signal
• improper adjustment to the Zero/Span settings on the valve actuator
• loose connections

RTHC-SVN02C-EN 15
Parts Information
This bulletin is informational only and does not authorize any parts or labor. Various
components can be ordered for controlling the condenser water side of the system.
Refer to the table below for the various parts available through your local Trane Parts
Center.
Table 4 Parts
Trane Part Number Qty needed Description
MOD00983 1 Adder Subtractor Module - 4U1 Controller with enclosure
TDR00301 2 Pressure Transducer (4R1 and 4R2)
BUS00363 2 Strain relief bushings
BUS00184 1 Strain relief bushing
CAB00906 144 inches Conductor cable
UNN00040 2 1/4” flare union, internal
BRK02884 1 Bracket
NUT00148 4 10-32 nut
SCR01557 4 10-32 x 1” screw
Table 5 List of Water Regulating Valves (one required)
Trane Part Number Description
VAL06912 6", 200 psi, water regulating valve with 115 VAC actuator
VAL06913 8", 200 psi, water regulating valve with 115 VAC actuator
VAL06914 6", 200 psi, water regulating valve with 220 VAC actuator
VAL06915 8", 200 psi, water regulating valve with 220 VAC actuator
VAL06916 6", 300 psi, water regulating valve with 115 VAC actuator
VAL06917 8", 300 psi, water regulating valve with 115 VAC actuator
VAL06918 6", 300 psi, water regulating valve with 220 VAC actuator
VAL06919 8", 300 psi, water regulating valve with 220 VAC actuator

Trane has a policy of continuous product data and product improvement and reserves the right to
change design and specifications without notice. Only qualified technicians should perform the
installation and servicing of equipment referred to in this bulletin.
Literature Order Number RTHC-SVN02C-EN
File Number SL-RF-RLC-RTHC-SVN02C-EN-0503
Supersedes RTHC-SVN02B-EN
Stocking Location Inland
Trane
A business of American Standard Companies
www.trane.com
For more information contact your local district
office or e-mail us at [e-mail]
Questions
Contact the Product Technical Service department in Pueblo, Colorado with questions
regarding this Service Bulletin. They can be reached at techser[email protected]
or 888-244-5537.