Carrier | 30GTN015-035 | Specifications | Carrier 30GTN015-035 Specifications

30GN,GT,GTN,GTR,GUN,GUR,HK,HL
38AH,AKS
Accessory Hot Gas Bypass Packages
50/60 Hz
Installation Instructions
30GA900161 (60 Hz — 115-v Control)
30GA900171 (50 or 60 Hz — 230-v Control)
CONTENTS
INTRODUCTION
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION IN
30GN,GT,GTN,GTR,GUN,GUR,HK,HL. . . . . . . . . 2-8
Step 1 — Examine Package Contents . . . . . . . . . . . . 2
Step 2 — Install Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
• 30GN,GT,GTN,GTR,GUN,GUR040-420 UNITS
• 30GTN015-035, 30HK040-060, AND
30HL050,060 UNITS
Step 3 — Dehydrate and Recharge Unit . . . . . . . . . . 3
Step 4 — Install Control Wiring. . . . . . . . . . . . . . . . . . . 4
OPERATION AND ADJUSTMENT . . . . . . . . . . . . . . .8-11
30GN Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
30GT Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
All ComfortLink™ Units . . . . . . . . . . . . . . . . . . . . . . . . . 11
INSTALLATION IN 38AKS, AH/INDOOR FAN COIL
(CONSTANT VOLUME/SPLIT SYSTEM
COMBINATION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-15
Step 1 — Install Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 2 — Install Control Wring . . . . . . . . . . . . . . . . . . 12
Step 3 — Restore Refrigerant Charge . . . . . . . . . . . 13
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
These instructions cover field installation of the accessory hot
gas bypass (HGBP) valve and solenoid pilot valve on specific
models. These models include the 30GT Flotronic™ chillers
and 30GN Flotronic II chillers in sizes 040-420. Also included
are all 30GTN,GTR,GUN,GUR040-420, 30GTN015-035 and
30HK,HL040-060 ComfortLink chillers. See Table 1.
On Flotronic chillers (30GT) with either no unloaders or
2 unloaders, the accessory hot gas bypass must be added to
both circuits because of an automatic lead-lag feature. On
ComfortLink chillers (30GTN,GTR,GUN,GUR040-070 sizes),
the addition of a compressor unloader solenoid coil must also be
added to compressor B1 to use the configurable lead-lag feature.
On 30GN,GT,GTN,GTR,GUN,GUR130-210 sizes, 2 hot
gas bypass packages must be installed, one on each circuit. On
30GN,GT,GTN,GTR,GUN,GUR230-420 sizes, 4 hot gas bypass packages must be installed, 2 on each unit module (Modules A and B).
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equipment can be hazardous due to system pressures, electrical components, and equipment location.
Only trained, qualified installers and service technicians
should install, start up, and service this equipment.
When working on air-conditioning equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work
gloves. Use care in handling equipment.
Be sure power to equipment is shut off before performing
maintenance or service.
IMPORTANT: When removing refrigerant, use an
approved refrigerant recovery device. Do not vent refrigerant into the atmosphere.
IMPORTANT: The following 2 combinations ARE NOT
ALLOWED on 30GN,GT,GTN,GTR,GUN,GUR230420 units.
• Two unloaders and hot gas bypass on one circuit.
• Four compressors, 1 unloader, and hot gas bypass
on one circuit.
For 30GT units, hot gas bypass will be activated only if the
lead compressor on a circuit is active. For 30GN,
30GTN,GTR, 30GUN,GUR and 30HK,HL units, hot gas bypass will be activated only if the lead compressor on a circuit is
both active and unloaded.
NOTE: The lead compressor in circuit A is compressor A1.
The lead compressor in circuit B is compressor B1. For location of lead compressor, refer to component arrangement in
wiring schematic on unit.
Table 1 — Accessory Application
UNITS
UNIT
TYPE
CONTROL
VOLTAGE
HOT GAS
PART NO.
30GA900-
30HK040-060
30HL050,060
50/60 Hz
115 v
161
60 Hz
60 Hz
50 Hz
60 Hz
60 Hz
50 Hz
60 Hz
60 Hz
50 Hz
60 Hz
60 Hz
50 Hz
115 v
230 v
230 v
115 v
230 v
230 v
115 v
230 v
230 v
115 v
230 v
230 v
161
171
171
161
171
171
161
171
171
161
171
171
30GTN015-035
30GTN020-030
30GN,GT,GTN,
GTR,GUN,
GUR040-420
38AK,AKS
38AH
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 2
PC 903
Catalog No. 563-020
Printed in U.S.A.
Form 30G,H/38A-2SI
Pg 1
9-00
Replaces: 30G,H/38A-1SI
Tab 3a 5c
INSTALLATION IN
30GN,GT,GTN,GTR,GUN,GUR,HK,HL CHILLERS
30GN,GT,GTN,GTR,GUN,GUR040-420 UNITS — See Fig. 1.
NOTE: For 30GN,GT,GTN,GTR,GUN,GUR230-420 units,
install bypass line, bypass valve, solenoid pilot valve, and
manual shutoff in each circuit of each unit module.
Bypass Line — Install field-supplied copper tubing between
the hot gas discharge line and the entrance to the cooler. Two
factory-sealed stubs are provided in each circuit, one on the
factory-sealed stubs are provided in each circuit, one on the
discharge line after the compressors and before the vertical
riser, and one on the liquid line between the expansion valve
and the cooler. See Fig. 1 and 2.
Bypass Valve — Install the bypass valve as close to the cooler
as possible. This minimizes the amount of liquid that can be
stored in the line. The bypass valve has a 5/8-in. ODF inlet and
outlet, and a 3/8-in. ODM equalizer port. To ensure proper
operation, install the bypass valve in a horizontal section of the
bypass line, with the solenoid pilot valve installed directly
above the body.
Step 1 — Examine Package Contents — Package includes hot gas bypass valve, solenoid pilot valve, and instructions. Examine each item. If any part is damaged or missing, file a claim immediately with the shipper. See Table 2 for
accessory package contents and field-supplied material.
Step 2 — Install Piping
Shut off all power to the unit and remove refrigerant charge
from circuit(s) using an approved refrigerant recovery
device before proceeding with installation.
Table 2 — Accessory Package Contents and Field-Supplied Material
ITEM
HGBP Relay, 115-v
Control Power
HGBP Relay, 230-v
Control Power
HGBP Relay,
20 vdc ckt
HGBP Relay,
24-v ckt
Time-Delay Relay
Resistor, (1/2 W;
620,000 ohm)
Filter Drier Cores†
Copper Tubing, Wiring,
Fittings**, Connectors**,
Filter Driers, Conduit, and
Manual Shutoff Service Valve
30GT040-420*
30GN040-420*
30GTN015-035
30HK,HL
38AK,38AKS,38AH/
INDOOR COIL
30GTN,GTR,
30GUN,GUR040-420
HN61KK912
—
—
—
—
HN61KK913
—
—
—
—
—
HK35AB001
—
—
—
—
—
—
HN67ZA001
—
—
HN61KK324††
HN61KJ510
—
30GT511259
—
—
—
—
—
—
KH29EZ050
KH29EZ050
—
—
Field Supplied
LEGEND
HGBP — Hot Gas Bypass
*One relay required per circuit.
†Two are needed for 040-090 and Modules 230B. Four are needed for 100,110 and
Modules 255B-315B. All other units require field-supplied filter driers (one per circuit).
**38AK/Indoor Coil only.
††38AKS 028-044 only.
EXV
TXV
LEGEND
— Electronic Expansion Valve
— Thermostatic Expansion Valv
Factory Piping
Field Tube (Copper)
NOTE: Pipe circuit 2 the same as circuit 1
(as applicable). Connect the 1/4-in. tube to
the lead compressor of the circuit.
Fig. 1 — Schematic Piping; 30GN,GT,GTN,GTR,GUN,GUR040-420
2
of the bypass line, with the solenoid pilot valve installed vertically (coil on top).
Solenoid Pilot Valve — Install the solenoid pilot valve in the
bypass valve at the external equalizer (3/8-in. OD sweat connection). The outlet side of the pilot valve is a 1/4-in. SAE
(Society of Automotive Engineers, U.S.A.) thread. Run a
1/4-in. OD, copper, field-supplied tube from this connection to
the thermostatic expansion valve (TXV) equalizer line. If the
connection is made directly to the TXV, use a 1/4-in. flare x
1/4-in. female flare tee. If the connection is made into the equalizer line, use a standard 1/4-in. flare tee.
Manual Shutoff — Connect a field-supplied manual shutoff
service valve in circuit A discharge line, avoiding traps in piping to hot gas bypass valve. Repeat for circuit B on 30HK,HL
units.
Solenoid Pilot Valve — Install the solenoid pilot valve in the
external equalizer line of the bypass valve. The solenoid valve
has a 3/8-in. ODF inlet and a 1/4-in. SAE (Society of Automotive Engineers, U.S.A.) outlet. Install field-supplied 1/4-in. OD
copper tubing from the SAE connection to the suction service
valve of the lead compressor in the circuit.
Manual Shutoff — Connect a field-supplied manual shutoff
service valve in discharge line, avoiding traps in piping to hot
gas bypass valve.
30GTN015-035, 30HK040-060, AND 30HL050,060
UNITS — See Fig. 3.
Bypass Line — Connect the field-supplied copper tubing to
the factory-provided stubs (see Fig. 2) in the hot gas discharge
line from the circuit A compressor and in the circuit A liquid
line between expansion valve and cooler (stubs are sealed from
factory). Repeat for circuit B on 30HK,HL units.
Bypass Valve — Install the bypass valve in the bypass line as
close to the cooler as possible. This minimizes liquid storage
between valve and cooler when valve is closed and prevents
flood of liquid refrigerant when the valve opens. To ensure
proper closing, install the bypass valve in a horizontal section
Step 3 — Dehydrate and Recharge Circuit —
When piping has been completed, leak test the assembly and
replace the filter drier or core(s) (field supplied) for the circuit.
After core (or drier) replacement, evacuate, dehydrate, and
recharge the circuit, using approved refrigerant recovery
device.
CIRCUIT B SIDE
CIRCUIT A SIDE
DISCHARGE
STUB TUBES
SUCTION PORT
OF SERVICE
VALVE
Fig. 2 — Factory-Sealed Discharge Line Stub Locations
(30GN,GT,GTN,GTR,GUN,GUR100 Shown)
3
TXV
LEGEND
— Thermostatic Expansion Valve
Factory Piping
Field Tube (Copper)
Fig. 3 — Schematic Piping; 30GTN015-035; 30HK040-060; 30HL050,060
Wire in the solenoid valves. Terminal blocks are provided
for easy field wiring. Wires external to the control box must be
run in field-supplied conduit. Use one of the predrilled holes in
the control box with a strain relief to run the wires to the solenoid valve from the box. Connect the hot gas bypass solenoid
A (HGBPS-A) between TB3-5 and TB3-8. Connect hot gas
bypass solenoid B (HGBPS-B) between TB3-6 and TB3-8.
See Fig. 6. Check all electrical connections for tightness and
proper location.
30GN HGBP Configuration — Once field-supplied relays are
mounted in the control box, the microprocessor must be configured for the hot gas bypass option. to do this, enter the service function using the LID (local interface device). Before
any changes can be made, move the LOCAL/ENABLESTOP-CCN switch to the STOP position. The service technician must also log on to the microprocessor. To do this, press
. The LID will display the word PASSWORD. Press
, and the LID will display LOGGEDON.
Step 4 — Install Control Wiring
Be sure all power to the unit is off before proceeding. Tag
all disconnects.
Wires between field-installed components and unit control
box must be enclosed in field-supplied conduit. Follow all local
codes and NEC (National Electrical Code U.S.A.). Wire size is
no. 16 AWG (American Wire Gage) (1.5 mm2) minimum. See
Fig. 4-12 for field wiring.
30GN,GT040-420 UNITS — Open the control box door.
Mount the field-supplied hot gas bypass relays A and B
(HGBPR-A, HGRPR-B) in the control box as shown on the
component arrangement label diagrams (Fig. 4). On 30GT
units, mount the field-supplied TDR (time-delay relay) as
shown on the component arrangement label on the unit.
To change the configuration: Press
, and the LID will
display FLD CFG. Press
until HGB 0 appears in the LID
display screen. Then press
for the hot gas bypass
option. The display now reads HGB 1. Once the configuration
is complete, press
, and the LID display will now
read LOGGEDON. Press
until the LID display reads
LOG OFF. Press
and the display will read EXIT LOG.
When mounting relays, be careful to avoid damaging electrical components and wiring in the mounting area.
30GN Units — Using the wires provided in the harness, wire
the coil of HGBPR-A in series between J6-18 and J6-19 of the
4 IN/4 OUT module. Wire the coil of HGRPR-B in series between J6-21 and J6-22 of the 4 IN/4 OUT module. See Fig. 5.
Locate a black wire in the control harness with the label
HGRPR-A-COM, which originates at TRAN 5. Connect this
wire to the HGBPR-A terminal COM. Connect the wires,
HGBPR-A-NO and TB3-5 to the appropriate terminals per
Fig. 6. For hot gas bypass on circuit B, connect the appropriate
wires to HGBPR-A-COM, HGBPR-B-COM, HGBPR-A-NO,
and TB3-6. See Fig. 6.
Using the test function, check the output of the relays. Press
and the display will read OUTPUTS. Press
until
the display reads HGBRA 1. Press
and the relay energizes. Press
and the relay deenergizes. When the check has
been performed, return the LOCAL/ENABLE-STOP-CCN
switch to the proper position. Close and secure the control box
door.
4
30GN UNIT: 040-110; 230B-315B MODULES
30GT UNIT: 040-110; 230B-315B MODULES
30GN UNIT: 130-210; 230A-315A,
330A/B-420A/B MODULES
30GT UNIT: 130-210; 230A-315A,
330A/B-420A/B MODULES
LEGEND
C
CB
CHT
CLHR
COM
CR
GRI-CO
—
—
—
—
—
—
—
GND
HGA
HGB
HGBPR
—
—
—
—
Contactor
Circuit Breaker
Cooler Heater Thermostat
Cooler Heater Relay
Communication
Control Relay
Ground Fault Interrupter —
Convenience Outlet (Accessory)
Ground
Hot Gas Circuit A
Hot Gas Circuit B
Hot Gas Bypass Relay
(Field Supplied)
NC
NEC
NO
PRI
SEC
SW
TB
TDR
TRAN
—
—
—
—
—
—
—
—
—
Normally Closed
National Electrical Code, U.S.A.
Normally Open
Primary
Secondary
Switch
Terminal Board
Time-Delay Relay (Field Supplied)
Transformer
Field Wiring
Factory Wiring
Accessory
*And Modules 315A, 390A, and 420A/B.
†And Modules 230A-315A, 330A/B-420A/B.
**And Modules 270A-315A, 330A/B-420A/B.
Fig. 4 — 30GN,GT Hot Gas Bypass Relay Locations (Field Supplied)
5
LEGEND
COMM — Communication
HGBPR — Hot Gas Bypass Relay (Field Supplied)
PWR
— Power
Fig. 5 — 30GN, 20-v Hot Gas Bypass Wiring
HGBPR
HGBPS
SNB
TB
TRAN
—
—
—
—
—
LEGEND
Hot Gas Bypass Relay (Field Supplied)
Hot Gas Bypass Solenoid
Snubber (Electrical Noise Suppressor)
Terminal Block
Transformer
Fig. 6 — 30GN, 115/230-v Hot Gas Bypass Wiring
6
HGBPR-A-4, HGBPR-A-5, HGBPR-B-4, HGBPR-B-6,
TDR-HGB-1, TDR-HGB-4, and TB5-6 to their correct terminals. See Fig. 7 (bottom section). Connect the 620,000-ohm,
1/2-w, field-supplied resistor across terminals 2 and 3 of the
time-delay relay. Repeat this procedure for the other time-delay
relay.
Wire in the solenoid valves. Terminal blocks are provided
for easy field wiring. Wiring external to the control box must
be run in field-supplied conduit. Use one of the 7/8-in. (22-mm)
holes in the control box with a strain relief to run the wires to
the solenoid A (HGBPS-A) between TB5-5 and TB5-8. Connect hot gas bypass solenoid B between TB5-6 and TB5-8. See
Fig. 7. Check all electrical connections for proper location and
tightness. Close and secure control box door.
30GT Units — All control box internal wiring is supplied
from the factory in a harness assembly. Connect the coil of
HGBPR-A in series between TB5-3 and TB5-7. (Connect
the wires marked HGBPR-A-C1, HGBPR-A-C2 to the appropriate terminals.) See Fig. 7 (top section). Wire the coil of
HGBPR-B in series between TB5-4 and HGBPR-A-C2. (Connect the wires marked HGBPR-B-C1 and HGBPR-B-C2 to the
appropriate terminals.) See Fig. 7 (top section).
For hot gas bypass on circuit A, locate a black wire in the
control harness with the label HGBPR-A-1, which originates at
TRAN 1. Connect the wires to the HGBPR-A-B, HGBPR-B-1,
HGBPR-B-2, TDR-HGA-1, TDR-HGA-4, and TB5-5 to the
correct terminals. See Fig. 7 (bottom section). For hot gas
bypass on circuit B, connect the wires labeled HGBPR-A-1,
LEGEND
HGA
HGB
HGBPR
HGBPS
LLSV
—
—
—
—
—
TB
TDR
TRAN
TXV
Hot Gas Circuit A
Hot Gas Circuit B
Hot Gas Bypass Relay
Hot Gas Bypass Solenoid
Liquid Line Solenoid Valve
—
—
—
—
Terminal Block
Time-Delay Relay (Field Supplied)
Transformer
Thermostatic Expansion Valve
Fig. 7 — 30GT040-420 HGBP (Hot Gas Bypass) Wiring
7
arrow keys to illuminate the LED). Press the Enter key and
then the down arrow key to display ‘OPT1’. Press the Enter
key again and use the down arrow key until ‘HGB.S’ is displayed. Press the Enter key twice. The words ‘PASS’ and
‘WORD’ will flash. Press the Enter key 4 times for the standard ‘1111’ password. Use the arrow keys if necessary to correctly enter unique passwords. Once the password is entered,
press the Enter key so that ‘NO’ flashes. Use either arrow key
to change the value to ‘YES’ and press Enter.
30GTN015-035 and 30HK,HL Configuration with Service
Tool — Using the Service Tool, select the Carrier Controls option from the menu. Select the chiller to be configured or Add,
Upload and then Select the chiller. Once selected, choose Modify, controller and then the OPTIONS1 table. Press the ‘F2’ key
and choose Upload for the current configurations. Select Save
and then Edit. Highlight the second item in the table, ‘Hot Gas
Bypass Select’ and use the spacebar to change its value to
‘Yes’. Press the ‘F2’ key, Save and then Download. Select Upload and then Enter to verify that the configuration was successfully received by the chiller.
Testing Solenoid Operation on ComfortLink™ Units — Using the Scrolling Marquee display or Navigator display, follow
the instructions given in the Controls Start-Up, Operation Service and Troubleshooting manual and use the Service Test
mode to verify proper operation of the solenoid(s) (illuminate
the Service Test LED, enable the Test mode using the ‘TEST’
sub-mode and enter the ‘COMP’ sub-mode to test the output
‘HGBP’). Note that both solenoids (30HK,HL units) are wired
in parallel and will be energized at the same time. When the
test has been completed, disable the ‘TEST’ mode and return
the Enable/Off/Remote Contact switch to the proper position.
Close and secure the control box door.
30GTN,GTR,GUN,GUR040-420 Units — Open the control
box door. Locate terminal block TB5. See Fig. 8. Using fieldsupplied wiring, conduit and fittings wire both solenoid valves.
Wires external to the control box must be run in field-supplied
conduit. Use one of the predrilled holes in the control box to
run the wires to pilot the solenoid valves from the control box.
Connect one lead from each of the solenoids to terminal block
TB5-9. Connect the other lead from each solenoid to TB5-12.
See Fig. 9.
30GTN,GTR,GUN,GUR040-420 Configuration — Once the
installation and wiring of both solenoid valves is complete, the
control must be configured for the hot gas bypass option. To do
this, place the Enable/Off/Remote Contact switch in the Off
position. Using the Scrolling Marquee display or Navigator
display, select the Configuration mode LED (press the Escape
key until the screen is blank and use the arrow keys to illuminate the LED). Press the Enter key and then the down arrow
key to display ‘OPT1’. Press the Enter key again and use the
down arrow key until ‘HGB.S’ is displayed. Press the Enter
key twice. The words ‘PASS’ and ‘WORD’ will flash. Press
the Enter key 4 times for the standard ‘1111’ password. Use the
arrow keys if necessary to correctly enter unique passwords.
Once the password is entered, press the Enter key so that ‘NO’
flashes. Use either arrow key to change the value to ‘YES’ and
press Enter. Follow the instructions given in the Control StartUp, Operation, Service and Troubleshooting manual and use
the Service Test mode to verify proper operation of the solenoids (illuminate the Service Test LED, enable the Test mode
using the ‘TEST’ sub-mode and enter the ‘COMP’ sub-mode
to test the output ‘HGBP’). Note that both solenoids are wired
in parallel and will be energized at the same time. When the
test has been completed, disable the ‘TEST’ mode and return
the Enable/Off/Remote Contact switch to the proper position.
Close and secure the control box door.
30HK040-060, 30HL050-060 Units — Open the control box
door. Locate terminal block TB2. See Fig. 10. Using fieldsupplied wiring, conduit and fittings wire both pilot solenoid
valves. Wires external to the control box must be run in fieldsupplied conduit. Use one of the predrilled holes in the control
box to run the wires to the solenoid valves from the control
box. Connect one lead from each of the solenoids to terminal
block TB2-3. Connect the other lead from each solenoid to
TB2. See Fig. 11.
30HK040-060, 30HL050-060 Configuration — Once the installation and wiring of both solenoid valves is complete, the
control must be configured for the hot gas bypass option. To do
this, place the Enable/Off/Remote Contact switch in the Off
position. The Scrolling Marquee display or Navigator or a
CCN device such as Service Tool must be used.
30GTN015-035 Units — Open the control box door. Remove
the inner panel. Remove the compressor junction box cover.
Locate the capped orange and white wires labeled ‘HGBP’.
The wire nuts are to be removed and these wires should be
removed from the junction box strain relief and routed to the
solenoid coil. Using field wire nuts, connect one lead of the
solenoid to the orange wire and connect the other lead of the
solenoid to the white wire. See Fig. 12.
30GTN015-035 Configuration — Once the installation and
wiring of the solenoid valve is complete, the control must be
configured for the hot gas bypass option. To do this, place the
Enable/Off/Remote Contact switch in the Off position. The
Scrolling Marquee, Navigator or a CCN device such as Service
Tool must be used.
30GTN015-035 and 30HK,HL Configuration with Scrolling
Marquee Display or Navigator — Using the Scrolling Marquee or Navigator display, select the Configuration mode LED
(press the Escape key until the screen is blank and use the
OPERATION AND ADJUSTMENT
(30GN,GT,GTN,GTR,GUN,GUR,HK,HL
CHILLERS)
The bypass valve is factory set to begin opening when suction pressure drops to about 62 psig (427 kPa). This pressure
corresponds to a chilled fluid controller set point of approximately 44 F (7 C). For R-134a systems (30GUN,GUR) the
valve will need to be adjusted. Recommended setting for 44 F
(7 C) leaving water is approximately 30 psig (206 kPa). If the
chilled fluid set point is lower than 44 F (7 C), it will be necessary to decrease the bypass valve setting for proper operation.
Conversely, for chilled fluid set points above 44 F (7 C), the
bypass valve setting must be increased. A change in condensing temperature will also require a change in bypass valve set
point. As condensing temperature decreases, decrease the bypass valve set point until it opens at the desired conditions. A
5/16-in. hex wrench is required. Remove the cap and turn the
adjustment nut with the hex wrench. A clockwise rotation increases the setting, and counterclockwise rotation decreases the
setting.
30GN Units — When the lead compressor is started, the
HGBPR (hot gas bypass relay) is energized if the compressor
unloader is active, completing a circuit to the appropriate
HGBPS (hot gas bypass solenoid) and opening the solenoid
valve. The time delay for the circuit pressures to stabilize is accomplished by the microprocessor. If the circuit suction pressure is below the setting of the hot gas bypass valve, the valve
begins to open. The valve continues to open until it either
reaches an equilibrium, or the maximum open position is
reached. Discharge gas is bypassed into the mixed phase line
between the expansion valve and the cooler. This condition
continues until the suction pressure rises above the setting or
the unit cycles off.
8
30GTN,GTR,GUN,GUR040-110; 230B-315B MODULES
(080-110, 230B-315B SHOWN)
30GTN,GTR,GUN,GUR130-210; 230A-315A; 330A/B-420A/B MODULES
Fig. 8 — Hot Gas Bypass Component Locations
30GTN,GTR,GUN,GUR040-420
Fig. 9 — Hot Gas Bypass Wiring
9
Fig. 10 — 30HK,HL with ComfortLink™ Controls
Fig. 11 — 30HK,HL Hot Gas Bypass Field Wiring
Fig. 12 — 30GTN015-035 Hot Gas Bypass Field Wiring
10
30GT Units — With a call for the first compressor, the
HGBPR (hot gas bypass relay) is energized, completing a circuit to the appropriate TDR-HG (time delay relay-hot gas). The
field-supplied 620,000 ohm, 1/2-w resistor permits approximately a one-minute time delay for the circuit pressures to stabilize. After the time delay has completed its cycle, the HGBPS
(hot gas bypass solenoid) opens. If the circuit suction pressure
is below the setting of the hot gas bypass valve, the valve begins to open. The valve continues to open until it either reaches
an equilibrium, or the maximum open position is reached. Discharge gas is bypassed into the mixed phase line between the
expansion valve and the cooler. This condition continues until
the suction pressure rises above the setting or the unit cycles
off.
Using the Scrolling Marquee or Navigator display, follow
the instructions given in the Controls Start-Up, Operation,
Service and Troubleshooting manual and use the Service Test
mode to verify proper operation of the solenoids (illuminate
the Service Test LED, enable the Test mode using the ‘TEST’
sub-mode and enter the ‘COMP’ sub-mode to test the output
‘HGBP’). Note that both solenoids are wired in parallel and
will be energized at the same time. When the test has been
completed, disable the ‘TEST’ mode and return the Enable/
Off/Remote Contact to the proper position. Close and secure
the control box door.
INSTALLATION IN
38AKS, AH/INDOOR FAN COIL
(CONSTANT VOLUME)
SPLIT SYSTEMCOMBINATION
All ComfortLink™ Units — When the lead compressor is started, the HGBP (hot gas bypass) solenoids are energized. The unloader(s) on the lead compressor is also energized
when the compressor is started. If the circuit suction pressure is
below the setting of the hot gas bypass valve, the valve begins
to open. The valve continues to open until it either reaches an
equilibrium, or the maximum open position is reached. Discharge gas is bypassed into the mixed phase line between the
expansion valve and the cooler. This condition continues until
the suction pressure rises above the setting. The hot gas bypass
solenoid(s) are only used at the first stage of capacity when
starting the lead compressor and as the last stage of capacity
before shutting down the lead compressor. The solenoids are
not energized when the lag circuit starts even if the lead compressor in the lag circuit is the only compressor running in the
circuit. The hot gas bypass solenoid(s) are deenergized when
the unit cycles off.
30HK040-060, 30HL050-060 CONFIGURATION — Once
the installation and wiring of both solenoid valves is complete,
the control must be configured for the hot gas bypass option.
To do this, place the Enable/Off/Remote Contact switch in the
Off position. The Scrolling Marquee, Navigator or CCN device
such as Service Tool must be used.
30HK, HL CONFIGURATION WITH SCROLLING
MARQUEE OR NAVIGATOR — Using the Scrolling Marquee or Navigator display, select the Configuration mode LED
(press the Escape key until the screen is blank and use the arrow keys to illuminate the LED). Press the Enter key and then
the down arrow key to display ‘OPT1’. Press the Enter key
again and use the down arrow key until ‘HGB.S’ is displayed.
Press the Enter key twice. The words ‘PASS’ and ‘WORD’
will flash. Press the Enter key 4 times for the standard ‘1111’
password. Use the arrow keys if necessary to correctly enter
unique passwords. Once the password is entered, press the Enter key so that ‘NO’ flashes. Use either arrow key to change the
value to ‘YES’ and press Enter.
30HK,HL CONFIGURATION WITH SERVICE TOOL —
Using the Service Tool, select the Carrier Controls option from
the menu. Select the chiller to be configured or Add, Upload
and then Select the chiller. Once selected, choose Modify, Controller and then the OPTIONS1 table. Press the ‘F2’ key and
choose Upload for the current configurations. Select Save and
then Edit. Highlight the second item in the table, ‘Hot Gas Bypass Select’ and use the spacebar to change its value to ‘Yes’.
Press the ‘F2’ key, Save and then Download. Select Upload
and then Enter to verify that the configuration was successfully
received by the chiller.
NOTE: Application of hot gas bypass to 38AKS VAV (variable air volume) systems is addressed in 38AKS/39E application literature.
Step 1 — Install Piping (See Fig. 13)
Shut off all power to the unit and remove refrigerant charge
using an approved refrigerant recovery device before proceeding with installation.
1. In applications where the air handler refrigerant distributor is not equipped with a side outlet connection, it is recommended that a Sporlan in-line auxiliary side connector
with standard distributor be used. Refer to the installation
instructions for the indoor fan coil to obtain nozzle size
and distributor connection size. Select the auxiliary side
connector based on this information. The side connector
must be installed on refrigerant circuit no. 1 (first stage of
cooling) of the fan coil being used.
2. Install a field-supplied 1/4-in. NPT to 1/4-in. flare fitting on
the gage connection port of the compressor suction service valve.
3. Sweat the pilot solenoid valve supplied in the hot gas accessary package directly to the hot gas bypass valve on
the 3/8-in. ODF external equalizer port.
4. Install field-supplied 1/4-in. copper tube (flared with a nut
on each end) between the compressor suction valve and
the hot gas pilot solenoid valve.
5. Connect a field-supplied 5/8-in. OD copper tube between
the discharge line process tube (hot gas stub) and a fieldsupplied manual shutoff service valve, avoiding any traps
in piping.
6. Connect another field-supplied 5/8-in. OD copper tube between the manual shutoff valve outlet and the hot gas bypass valve inlet.
7. Connect a field-supplied 5/8-in. OD copper tube between
the leaving side of the hot gas bypass valve and the Sporlan
auxiliary side connector (distributor-side connector).
11
LEGEND
TXV — Thermostatic Expansion Valve
*Pilot valve connects directly to bypass valve per sketch A.
Fig. 13 — Hot Gas Bypass Piping
3. SOLENOID WIRING
a. Add a field-supplied wire between TB3-2 and
HGR-4.
b. Connect one leg of the hot gas bypass solenoid to
HGR-5.
c. Connect the other wire from the hot gas bypass
solenoid to terminal TB3-1.
38AH044-084 SINGLE CIRCUIT APPLICATIONS
1. Install a field-supplied relay with a 115-v coil
(HN61KJ510 suggested) and normally closed contacts
rated for 20 va at 125 vac inductive load. Mount this relay
near the control relay (CR1) in the 38AH control box.
NOTE: This relay is identified in Fig. 16 as HGR (hot gas
relay).
2. COIL WIRING
Connect a field-supplied wire between TB3-3 and
HGR-1 (L1 side of coil). Connect a field-supplied wire
between TB3-7 and HGR-3 (L2 side of coil).
3. SOLENOID WIRING
a. Add a field-supplied wire between TB3-5 and
HGR-4.
b. Connect one leg of the hot gas bypass solenoid to
HGR-5.
c. Connect the other wire from the hot gas bypass
solenoid to terminal TB3-7.
38AH044-104 DUAL CIRCUIT APPLICATIONS
1. Install a field-supplied relay with a 115-v coil
(HN61KJ510 suggested) and normally closed contacts
rated for 20 va at 125 vac inductive load. Mount this relay
near the control relay (CR1) in the 38AH control box.
Step 2 — Install Control Wiring (See Fig. 14-17)
38AKS028-044
1. Install a field-supplied relay with a 24-v coil
(HN61KK324 suggested) and normally closed contacts
rated for 20 va at 125 vac inductive load. Mount this relay
near the control relay (CR1) in the 38AKS control box.
NOTE: This relay is identified in Fig. 14 as HGR (hot gas
relay).
2. COIL WIRING
Connect a field-supplied wire between TB3-3 and
HGR-1 (L1 side of coil). Connect a field-supplied wire
between TB3-7 and HGR-3 (L2 side of coil).
3. SOLENOID WIRING
a. Add a field-supplied wire between TB2-2 and
HGR-5.
b. Connect one leg of the hot gas bypass solenoid to
HGR-6.
c. Connect the other wire from the hot gas bypass
solenoid to terminal TB2-3.
38AH024-034
1. Install a field-supplied relay with a 115-v coil
(HN61KJ510 suggested) and normally closed contacts
rated for 20 va at 125 vac inductive load. Mount this relay
near the control relay (CR1) in the 38AH control box.
NOTE: This relay is identified in Fig. 15 as HGR (hot gas
relay).
2. COIL WIRING
Connect a field-supplied wire between TB3-3 and
HGR-1 (L1 side of coil). Connect a field-supplied wire
between TB3-1 and HGR-3 (L2 side of coil).
12
b. Connect one leg of the hot gas bypass solenoid to
HGR-5.
c. Connect the other wire from the hot gas bypass
solenoid to terminal TB3-7.
NOTE: This relay is identified in Fig. 17 as HGR (hot gas
relay).
2. COIL WIRING
Connect a field-supplied wire between TB4-2 and
HGR-1 (L1 side of coil). Connect a field-supplied wire
between TB3-8 and HGR-3 (L2 side of coil).
3. SOLENOID WIRING
a. Add a field-supplied wire between TB3-5 and
HGR-4.
Step 3 — Restore Refrigerant Charge — Charge
unit in accordance with 38AKS/38AH Charging Chart found
on unit.
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
1. Dirt or foreign material in valve.
2. Equalizer passageway clogged.
3. External equalizer not connected or
equalizer line is pinched shut.
1. Dirt or foreign material in valve.
2. Diaphragm failure.
Hot gas bypass valve fails to open.
Hot gas bypass valve fails to close.
SOLUTION
1. Disassemble and clean valve.
2. Disassemble and clean valve.
3. Connect or replace equalizer line.
Check solenoid valve.
1. Disassemble and clean valve.
2. Replace element only.
TB3
TC2
TB3
LLS
LLSV
2
1
HGR
7
3
TB2
TB2
2
3
HOT GAS
HGR
5
6
SOLENOID VALVE
LLSV
HGR
LLS
LLSV
TB
TC
—
—
—
—
—
LEGEND
Hot Gas Relay
Liquid Line Solenoid
Liquid Line Solenoid Valve
Terminal Block
Temperature Controller
NOTE: Hot Gas Relay (HGR) uses P/N HN61KK324.
Fig. 14 — 38AKS028-044 HGBP Wiring Modifications
13
LLSV-1
TB3
CR1
TB3
2
3
1
1
HOT GAS
HGR
4
5
SOLENOID VALVE
LLSV-2
TB3
3
1
CR
HGR
LLSV
TB
—
—
—
—
HGR
3
LEGEND
Control Relay
Hot Gas Relay
Liquid Line Solenoid Valve
Terminal Block
NOTE: Hot Gas Relay (HGR) uses P/N HN61KJ510.
Fig. 15 — 38AH024-034 HGBP Wiring Modifications
3
1
LLS-A1
TB3
SDR2
LINE 255
TB3
5
7
HOT GAS
HGR
4
5
SOLENOID VALVE
LINE 257
TB3
3
SDR2
4
6
1
HGR
LLS
SDR
TB
—
—
—
—
HGR
3
LEGEND
Hot Gas Relay
Liquid Line Solenoid
Solenoid Drop Relay
Terminal Block
NOTE: Hot Gas Relay (HGR) uses P/N HN61KJ510.
Fig. 16 — 38AH044-084 Single Circuit HGBP Wiring Modifications
14
LINE 224 (044-084)
240 (094,104)
SDR2
3
1
LLS-A1
TB3
TB3
5
7
HOT GAS
HGR
4
5
SOLENOID VALVE
LINE 315/350 (044-084)
340/345 (094,104)
TB4
2
SDR4
3
1
TB3
1
HGR
LLS
SDR
TB
—
—
—
—
HGR
3
LEGEND
Hot Gas Relay
Liquid Line Solenoid
Solenoid Drop Relay
Terminal Block
NOTE: Hot Gas Relay (HGR) uses P/N HN61KJ510.
Fig. 17 — 38AH044-104 Dual Circuit HGBP Wiring Modifications
15
8
Copyright 2000 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 563-020
Printed in U.S.A.
Form 30G,H/38A-2SI
Pg 16
9-00
Replaces: 30G,H/38A-1SI
Book 1 2
Tab 3a 5c
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