Carrier Air Conditioner 30GT User Manual

30GT  
K,HL  
HEATING  
SAFETY CONSIDERATIONS  
INTRODUCTION  
These instructions cover field installation of the Acces-  
Installing, starting-up and servicing air conditioning  
equipment can be hazardous due to system pressures,  
electrical components and equipment location,  
sory Hot Gas  
B y ass Valve and solenoid pilot valve on  
the following chi lers:  
through 060 (50 and 60 Hz)  
Only trained, qualified installers and service techni-  
cians 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.  
(60 Hz), Flotronic’”  
(50 Hz), Flotronic’”  
through 200 (50 and 60 Hz), Flotronic’”  
(60 Hz)  
(50 Hz)  
Follow all safety codes. Wear safety glasses and work  
gloves. Use care in handling equipment.  
On Flotronic chillers with no unloaders or 2 unloaders,  
the accessory hot gas bypass must be added to both  
circuits because of  
automatic lead-lag feature.  
INSTALLATION  
Examine e Contents  
Step 1  
Pack-  
age includes hot gas bypass va ve, solenoid pilot valve  
and instructions. Examine each item. If any part is  
damaged or missing, file a claim immediately with the  
shipping agent.  
Step 2  
Install Piping  
SUCTION LINE  
C O O L E R  
LINE (CIRCUIT  
I
STUB  
I
(SEALED FROM  
FACTORY  
BYPASS VALVE  
SEE N O T E  
2
SEE NOTE I  
FROM FACTORY  
FIELD-SUPPLIED BYPASS LINE  
HOT GAS DISCHARGE  
C O N D E N S E R  
TXV  
TH ER MOSTATI.C EXPANSION VALVE  
FACTORY PIPING  
PIPING  
- - -  
- - - a  
NOTES:  
1. %-in. OD for  
and 30GT;  
this package has %-in. connections and can be used directly on  
to must be made either at the valve or at the stubs.  
OD for 30GB.  
2. The bypass valve  
and 30GT units.  
3. On 30GB units, a change from  
Fig.  
1
Schematic Piping;  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
P C 1 1 1 Catalog No. 533-039  
Replaces:  
Printed in U.S.A.  
Form  
SI  
2-89  
 
UNITS,  
(See Fig. 2.)  
UNITS  
and  
(See Fig. 1.)  
Bypass Line  
Install field-supplied line between the  
Line  
Connect the field-supplied line to the  
header on inlet side of lead coil and the entrance to the  
cooler. Two factory-sealed stubs are provided in each  
circuit, one on the lead coil header and one on the liquid  
line between the Flotronic expansion valve (EXV) and  
the cooler.  
factory-provided stubs in the discharge line  
the  
circuit no. 1 compressor and in the  
no.  
line,  
between expansion valve and cooler (stubs are sealed  
from factory).  
Bypass Valve  
Install the valve in the  
line as  
liquid  
NOTE: The 30GB 1  
units have 2 stubs in the high  
close to the cooler as possible. This  
side of each circuit, one on each lead coil header; it is  
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 of the bypass line, with the pilot  
valve installed vertically (coil on top).  
necessary to connect piping to only one of these stubs.  
Bvpass Valve  
Install the valve in the bypass line as  
close to the cooler as possible. This minimizes liquid  
storage between the valve and cooler when valve is  
closed and prevents flood of liquid refrigerant when the  
valve opens. To ensure proper closing, install the by ass  
Solenoid Pilot Valve Install on the bypass valve at the  
external equalizer  
OD sweat connection). The  
outlet side of the pilot valve is a  
OD tube from this connection to the thermo-  
static expansion valve (TXV) equalizer line, If the  
SAE thread. Run  
valve in  
a
horizontal section of the bypass line, wit the  
a
pilot valve installed vertically (coil on top).  
Solenoid Pilot Valve  
Install on the bypass valve at  
connection is made directly to the TXV, use a  
FL  
the external equalizer. The outlet side of the pilot valve is  
x
female flare tee. If the connection is made into  
a
SAE thread. Run a  
OD tube from this  
the equalizer line, use a standard FL tee.  
connection to the suction valve of the lead compressor  
in the circuit.  
SUCTION LINE VALVE  
EXV- ELECTRONIC EXPANSION VALVE  
TXV- THERMOSTATIC EXPANSION VALVE  
PIPING  
PIPING  
NOTE: Circuit  
2
should be piped same as circuit 1. The  
tube should be connected to the lead compressor in both circuits.  
CKT  
CKT  
CKT  
CKT  
CKT  
CKT  
CKT  
CKT  
0 6 0  
CKT  
q2p☺  
090,100  
110,125  
0 7 5 , 0 8 0  
CKT  
CKT  
qma  
ql2☺lml-g  
200  
Compressor numbers, viewed facing compressor side of unit.  
Fig. 2  
Schematic Piping;  
with Electronic Controls (Flotronic)  
2
 
Step 3  
Dehydrate and Recharge Circuit  
W h e n piping has been completed, leak test the assembly  
and replace the filter drier, or core(s) for circuit no. 1.  
On single-compressor chillers  
for 60 Hz, 020,025 for 50 Hz; 30GT) the filter drier itself  
must be replaced.  
15,025 and 030  
TIME DELAY  
MODULE  
After core (or drier) replacement, evacuate, dehydrate  
and recharge the circuit. Procedures for evacuation,  
dehydration and charging are detailed in Carrier Stand-  
ard Service Techniques Manual, Chapter 1, Refrig-  
erants, Sections 6 and 7.  
6 0 0 K  
RESISTOR  
HGS  
RI  
R2  
TIME DELAY  
MODULE  
Step 4  
Install Control Wiring  
T B 2  
4
I
Be sure all power to the unit is off before proceeding.  
c
l
c
c
l
l
1
T B 2  
2
q
Fig. 4  
Hot Gas Solenoid Wiring, Units with  
No Unloaders or Two Unloaders  
Wires between field-installed components and unit  
control box must be enclosed in conduit. Wire size is  
no. 16 AWG minimum. Wire-end terminals required on  
field wires are indicated in the Combined Legend for  
Fig. 3 8.  
UNITS  
Fig. 3.)  
THROUGH 070 FLOTRONIC (See  
Control logic allows the hot gas bypass to be  
energized only on the first stage of capacity.  
A unit with 2 unloaders has the automatic lead/lag  
feature which allows starting of either circuit, and  
thus must have 2 hot gas bypass packages, one per circuit  
(see Fig. 4).  
On the 040-060 units, R3 should energize with com-  
pressor no. 2. On the 070 unit. R3 energizes with com-  
pressor no. 3. In both instances, it is the lead compressor  
on circuit no. 2 (see Fig. 5.)  
RI and R2 Coil Wiring, All Units  
Fig. 5  
Connect R2 in parallel with lead compressor in circuit 2:  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Comp 2  
. . . . . . . . . . . . . . . . . , . . . . . . . . . .  
. . . . . . . . . Comp 3  
. . . . . . . . . . . . . . . . . . . . . . . . . . . .  
. . . . . . . . Comp 4  
.
. . . . . . . , .  
. . . . . . . . . . . . . . . . .  
.
Comp 5  
(Refer to Fig. 2 for compressor locations.)  
The time delay module must be set for a one-minute  
delay by connecting a  
resistor between the  
center terminals of the module (see Fig. 6). (One second  
of time delay results from each  
of resistance.)  
6 0 0 K  
RESISTOR  
HGS  
NOTES:  
RI  
1. Relays R 1 and R2 apply to all units.  
2. R3 applies only to units with a single unloader. Units  
with no unloaders or 2 unloaders do not require R3.  
3. 30GB 175 and 200 units do not use unloaders.  
Gas Solenoid Wiring,  
Fig. 6  
Hot  
Single Unloader Units  
FLOTRONIC’” UNITS,  
THROUGH 070  
Drill a hole to accommodate a standard conduit fitting  
RELAY  
BOARD  
in bottom of control box at  
entrance hole for control  
end, adjacent to existing  
Locate HGR Gas  
J 6  
FIELD SPLICE  
Bypass Relay) in right side of control box adjacent to  
existing relays. Using the HGR base as a template, mark  
,
,
mountmg hole  
and drill appropriate hole. Run  
PIN 4  
CKT NO.21  
I
conduit from the bypass valve to the control box and wire  
relays into control circuit as shown in Fig. 4. Relays  
and Time  
Module should be installed in the upper  
left corner of the control box, above the transformer.  
TB4  
FLOTRONIC UNITS, THROUGH 200  
2 holes in the bottom right of the control box, next  
to the compressor conduit holes, to accommodate stand-  
ard conduit fittings. Run conduit from the bypass valve  
to the control box and wire relays into control circuit  
as shown in Fig. 4.  
NOTE: 3063175,200  
R3 DOES NOT APPLY.  
Fig. 3  
R3 Coil Wiring (R3 used only with  
units having a single unloader)  
 

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