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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 533-00067 Printed in U.S.A. Form 30GT/38AKS-1SI Pg 1 1-05 Replaces: 30GT-35SI
Book124
Tab 3a 5c 2a
Installation Instructions
Part No. 30GT911054
GENERAL
These installation instructions cover field installation of the
accessory hot gas bypass valve, pilot valve, and hot gas sole-
noid. For 30GT units, these instructions are intended for units
with a starting serial number of 2294F--- or higher. The hot gas
bypass package is not required on 30GT015, 50 Hz units or on
30GT020, 60 Hz units, since these 2 units have hot gas bypass
installed as standard from the factory. See table below for a list-
ing of package contents.
NOTE: Since the 30GT015-035 and 38AKS014-024 units are
single-circuit units, only one accessory package is required per
unit.
ACCESSORY PACKAGE CONTENTS
In addition, the following parts will need to be
field-supplied:
•
1
/
4
-in. refrigerant grade copper tubing (amount will vary
with application)
•
3
/
8
-in. refrigerant grade copper tubing (amount will vary
with application)
•
5
/
8
-in. refrigerant grade copper tubing (amount will vary
with application)
• For 30GT units, one manual shut-off valve for
5
/
8
-in. line
• One 3-way-tee with an internal branch OR one standard
3-way tee (depending on application - see Pilot Valve
and Hot Gas Solenoid section for more information)
• For 38AKS/indoor coil split system, an auxiliary side
connector may be required.
Examine Package Contents — Examine each item
in the package. If any part is damaged or missing, file a claim
immediately with the shipper. See table above for accessory
package contents.
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equip-
ment 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 pre-
cautions in the literature and on tags, stickers, and labels at-
tached to the equipment.
Follow all safety codes. Wear safety glasses and work
gloves. Use care in handling equipment.
INSTALLATION IN 30GT
AIR-COOLED CHILLERS
Step 1 — Install Piping
See Fig. 1 for a schematic of the unit piping.
BYPASS LINE — Install the
5
/
8
in., field-supplied line
between the factory-supplied stubs in the discharge line (from
the compressor) and in the liquid line between the expansion
valve and cooler. See Fig. 2.
NOTE: The stubs are sealed as shipped from the factory.
Install the field-supplied shut-off valve in the bypass line as
close to the discharge line as possible. The shut-off valve will
aid in the pumpdown of the low side when closed.
HOT GAS BYPASS VALVE — Install the valve in the bypass
line near the shut-off valve installed in the Bypass Line section
above. The bypass valve has
5
/
8
in. ODF inlet and outlet (one
each), and a
3
/
8
in. ODM equalizer port (sweat connection). To
ensure proper operation, the valve should be installed in a hori-
zontal section of the bypass line and the pilot valve should be
installed above bypass valve body.
PILOT VALVE AND HOT GAS SOLENOID — Install the
hot gas solenoid onto the pilot valve. The solenoid fits over the
stem of the valve and attaches with the supplied clip on the top
(over the coil).
Install the pilot valve/solenoid assembly in the external
equalizer line of the bypass valve (
3
/
8
in. ODF equalizer port).
The pilot valve has a
3
/
8
in. ODF inlet and a
1
/
4
in. SAE
(Society of Automotive Engineers, U.S.A.) connection to the
TXV (thermostatic expansion valve) equalizer line.
ITEM QUANTITY PART NO.
Pilot Valve 1 EF11BS038
Hot Gas Solenoid
With Clip
1 EF19XS024
Hot Gas Bypass
Valve
1 EA52DC421
Be sure power to equipment is shut off before performing
maintenance or service functions. Electrical shock may
cause personal injury.
Shut off all power to the unit and remove refrigerant charge
before continuing with this accessory installation. Failure
to do so may result in personal injury.
IMPORTANT: Be sure the sweat connection on the hot gas
bypass valve is facing the pilot valve/solenoid assembly in
the equalizer line (See Fig. 1).
38AKS014-024
30GT015-035
Accessory Hot Gas Bypass
50/60 Hz