2
INTRODUCTION
These instructions cover installation of 30XW liquid chillers with
electronic controls and units with factory-installed options
(FIOPs).
System Design
SYSTEM PIPING
Proper system design and installation procedures should be fol-
lowed closely. The system must be constructed with pressure tight
components and thoroughly tested for installation leaks.
Installation of water systems should follow sound engineering
practice as well as applicable local and industry standards. Im-
properly designed or installed systems may cause unsatisfactory
operation and/or system failure. Consult a water treatment special-
ist or appropriate literature for information regarding filtration,
water treatment, and control devices.
MINIMUM LOOP VOLUME
The preferred minimum loop volume is dependent on the type of
application. In order to obtain leaving water temperature stability
for comfort cooling applications, a minimum of 3 gallons per ton
(3.25 liters per kW) is required on all unit sizes. For process cool-
ing applications or applications where high stability is critical, the
loop volume should be increased to 6 to 10 gallons per ton (6.46 to
10.76 liters per kW) of cooling. In order to achieve this volume, it
may be necessary to add a water storage tank to the water loop. If
a storage tank is added to the system, it should be installed on the
return/entering fluid side and properly vented so that the tank can
be completely filled and all air eliminated. Failure to do so could
cause lack of pump stability and poor system operation. Any stor-
age tank that is placed in the water loop should have internal baf-
fles to allow thorough mixing of the fluid. See Fig. 1.
Fig. 1 — Tank Baffling
INSTALLATION
Step 1 — Inspect Shipment
Inspect unit for damage upon arrival. If damage is found, immedi-
ately file a claim with the shipping company. Verify proper unit
delivery by checking unit nameplate data and the model number
nomenclature shown in Fig. 2. Do not store units in an area ex-
posed to weather because of sensitive control mechanisms and
electronic devices. Chiller should be stored indoors, protected
from construction dirt and moisture and with temperatures be-
tween 40°F (4.4°C) and 120°F (48.9°C) and relative humidity be-
tween 10% and 80% (non-condensing).
Step 2 — Prepare Installation Site
Locate unit indoors. When considering unit location, consult Na-
tional Electrical Code (NEC, U.S.A.) and local code requirements.
Allow sufficient space for wiring, piping, and service. Install unit
in an area which will not be exposed to ambient temperatures be-
low 50°F (10°C).
Be sure surface beneath unit is level and is capable of supporting
the operating weight of the unit. See Tables 1 and 2 and Fig. 3-7
for unit mounting and operating weights and dimensions.
If necessary, add supporting structure (steel beams or reinforced
concrete slabs) to floor to transfer weight to nearest beams. See
Fig. 3-5 for clearance details.
Allow the following clearances for service access:
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft (914 mm)
Rear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft (914 mm)
Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ft (610 mm)
Ends . . . . . . . . . . . . . . . . . . . . . . . . tube length at one (either) end;
. . 3 ft (914 mm) at opposite end.
CAUTION
This unit uses a microprocessor control system. Do not short
or jumper between terminations on circuit boards or modules;
control or board failure may result.
Be aware of electrostatic discharge (static electricity) when
handling or making contact with circuit boards or module con-
nections. Always touch a chassis (grounded) part to dissipate
body electrostatic charge before working inside control center.
Use extreme care when handling tools near boards and when
connecting or disconnecting terminal plugs. Circuit boards can
easily be damaged. Always hold boards by the edges and
avoid touching components and connections.
This equipment uses, and can radiate, radio frequency energy.
If not installed and used in accordance with the instruction
manual, it may cause interference to radio communications. It
has been tested and found to comply with the limits for a Class
A computing device pursuant to International Standard in
North America EN 61000-2/3 which are designed to provide
reasonable protection against such interference when operated
in a commercial environment. Operation of this equipment in
a residential area is likely to cause interference, in which case
the user, at his own expense, will be required to take whatever
measures may be required to correct the interference.
Always store and transport replacement or defective boards in
anti-static shipping bag.
