Carrier MINIMUM LOAD CONTROL ACCESSORY 30RB060-390 Installation Instructions Manual

SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equip-
ment can be hazardous due to system pressures, electrical com-
ponents 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, on tags, stickers, and labels
attached to the equipment.
Follow all safety codes. Wear safety glasses and work
gloves. Use care in handling equipment.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all discon-
nect locations to alert others not to restore power until work
is completed.
GENERAL
IMPORTANT: This accessory can only be used on units
configured for Cooler Fluid Type (Configuration
 
SERV FLUD = 1 [Water]). The minimum load control
accessory (HGBP) is not allowed on units configured for
Cooler Fluid Type (Configuration
[Brine]).
This control accessory reduces 30RB chiller capacities be-
low the standard lowest capacity step. This capacity reduction
provides more precise control of leaving fluid temperature
during light load conditions.
The solenoid valve limits the amount of gas that can be
bypassed from the condenser without impacting oil return.
One accessory package is required for 30RB060-190 units
and for each module of duplex units 30RB315-390. Two
accessory packages are required for 30RB210-300 units to
accommodate connections for all three refrigerant circuits. See
Table 1 for modular unit combinations.
Table 1 — Modular Unit Combinations
UNIT SIZE MODULE A
30RBA315 30RBA160
30RBA330 30RBA170
30RBA345 30RBA170
30RBA360 30RBA190
30RBA390 30RBA190
NOTE: An "A" in the model number indicates the design series.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53300047-01

Installation Instructions

Part No: 00EFN900000100A
 
SERV FLUD = 2
MODULE B
30RBA160
30RBA160
30RBA170
30RBA170
30RBA190
Printed in U.S.A. Form 30RB-16SI
Minimum Load Control Accessory
INSTALLATION
Examine the package contents for correct part numbers. If
any of the components are damaged, file a claim with the
shipping company and notify a Carrier representative.
See Table 2 for package contents. See Fig. 1 for dimensional
drawings of tubes included in the kit.
The following material is field supplied:
• 1 / in. OD copper tubing
2
• standard 1 / in. copper tube elbows and couplings as required
2
Install the Solenoid Valve
Shut off all power to the unit. Lock out and safety-tag all
disconnects. Remove refrigerant charge from the circuits
using an approved refrigerant recovery device before
proceeding with this installation. Follow good piping
practices. Severe personal injury could result.
1. Shut off power to the unit.
2. Remove refrigerant charge from the unit.
3. Locate the factory-supplied stub on the discharge line for
each circuit. Locate the
blank end of the cooler for 30RB110 circuit B and
for both circuits A and B on 30RB060-300 units. See
Fig. 2.
4. Remove the 1 / in. NPT pipe plugs from the blank end
2
of the cooler. Use an appropriate thread sealing
compound and install one 1 in. — 14 O-ring seal
adapter for each circuit. Lightly lubricate each O-ring
and attach a 5 / in. O-ring seal tube assembly to each
8
adapter. This nut should be torqued to 30 ft-lb (40 N-
m). For 30RB110 circuit A size only, use a tubing cut-
ter to cut off the end of the stub tube. See Fig. 3.
5. Assemble the hot gas bypass line in the following order:
a. Remove the discharge stub tube and braze the cor-
rect beaded tube in place.
b. Braze the ball valve to the beaded tube.
c. Braze the solenoid valve into the line.
d. Using field-supplied tubing, connect the solenoid
valve to the low side connection, either the cooler
or the liquid line.
e. Clamp the 5 / -in. tube to the rail. See Fig. 4 and 5.
8
Use field-supplied
tings (as required) to plumb from the solenoid valve
outlet to either the adapter tube in the cooler or stub
tube in the liquid line depending on unit size. Tube
support brackets and
with the kit. Install brackets to the bottom of the coil
bases to support tubing.
Pg 1
30RB060-390
WARNING
1 / in. NPT pipe plugs at the
2
1 / in. OD copper tubing and fit-
2
/ in. tubing clamps are provided
1
2
3-10 Replaces: 30RB-4SI