APPLICATION
High Temp Unit Coolers are designed for use with R12, R22,
R134a, R404A, R407A/B/C, R507 or R502 refrigerants.
At room temperatures above 34°F and evaporating temps no
lower than 27°F the air flowing through the coil will accomplish
the defrost. Temperatures of 34°F and below (to -40°F) require
positive defrosting. (either Electric or Hot Gas).
The coil must not be exposed to any abnormal atmospheric or
acidic environments. This may result in corrosion to the cabinet
and possible coil failure (leaks). (Consult manufacturer for
optional baked on phenolic protective coatings).
INSTALLATION
The installation and start-up of Unit Coolers should only be
performed by qualified refrigeration mechanics.
This equipment should be installed in accordance with all
applicable codes, ordinances and local by-laws.
INSPECTION
Inspect all equipment before unpacking for visible signs of
damage or loss. Check shipping list against material received
to ensure shipment is complete.
IMPORTANT: Remember, you, the consignee, must make any
claim necessary against the transportation company. Shipping
damage or missing parts, when discovered at the outset, will
prevent later unnecessary and costly delays.
If damage or loss during transport is evident, make claim to
carrier, as this will be their responsibility, not the
manufacturer’s.
Should carton be damaged, but damage to equipment is not
obvious, a claim should be filed for “concealed damage” with
the carrier.
IMPORTANT: The electrical characteristics of the unit should be
checked at this time to make sure they correspond to those
ordered and to electrical power available at the job site.
Save all shipping papers, tags and instruction sheets for
reference by installer and owner.
LOCATION
The unit location in the room should be selected to ensure
uniform air distribution throughout the entire space to be
refrigerated. Be sure that the unit does not draw air in, or blow
directly out, through an opened door and that the product does
not obstruct the free circulation of air. Allow a minimum of 24”
clearance at each end and behind the unit.
The Unit Coolers draw air through the coil and discharge air
from the fan side.
Consideration should be given to the coil location in order to
minimize the piping run length to the condensing unit and floor
drain.
MOUNTING
Mounting brackets with 7/16” dia holes are provided for flush
mounting to the ceiling. For details refer to dimensional data on
page 5. Ensure adequate clearance (at least 24”) is provided
behind the coil as well as each side (to enable access to the
electrical and refrig. compartments).
Ensure that the ceiling is level since the drain pan has been
sloped for drainage during the defrost cycle.
DRAIN LINE
The drain line should be run from the drain connection, sloping
at least 4” per foot. A trap outside the room will prevent warm air
from entering through the tubing. Connection should be made
to proper drainage facilities that comply with local regulations.
Ensure that the drain pan has sufficient slope for proper
drainage (prevention of ice build up/blockage in pan).
PIPING
Refrigerant line sizes are important and may not be the same
size as the coil connections. (depends on the length of run) If in
doubt, consult “Recommended refrigerant line sizes” charts.
(Engineering Manuals or other recognized sources of
information).
WIRING
Wire system in accordance with governing standards and local
codes. See data and wiring diagrams on pages 2 and 3 for
wiring arrangement. Electrical wiring is to be sized in
accordance with minimum ampacity rating.
SYSTEM CHECK
Before Start-Up:
1. All wiring should be in accordance with local codes.
2. Refrigerant lines should be properly sized.
3. Off-cycle defrost systems should include a liquid line
solenoid valve.
4. Thorough evacuation and, dehydration has been performed.
5. The suction, discharge, and receiver service valves must be
open.
6. The system should include a liquid line drier moisture
indicator and suction filter.
7. Pour enough water into the drain pan to allow a good check
on drainage and seal the trap.
After Start-Up:
1. Check the compressor oil level to ensure the correct oil
charge.
2. Be sure that the expansion valve is properly set to provide
the correct amount of superheat.
3. Heavy moisture loads are usually encountered when starting
the system for the first time.
4. Check for proper evaporator fan blade rotation.
MAINTENANCE
The unit should be periodically inspected for any dirt or build-up
on the fin surface and cleaned if necessary with a soft whisk or
brush.
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