KeepRite KLP Series, Данные о продукте и установка

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K30-KLPD-PDI-4 14/10/20 - 31 -
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DRAIN LINE
The drain line should be run from the drain connection, sloping
at least 1” (25 mm) per foot and should have the size at least as
large as the drain connection. A trap in a warm area outside the
room must be provided to allow proper draining through the tub-
ing. Connection should be made to proper drainage facilities that
comply with local regulations.
To prevent freeze-up when the temperature of the
refrigerated space is 35°F (2 °C) or lower, the drain line should
be heated along its run inside the cold room. The heated drain
line should be insulated. It is recommended that the heater be
energized at all times. A heat input of 20 watts per foot in a 28°F
(-2°C) room and 30 watts per foot for -20°F (-29°C) rooms, is
satisfactory. Drain line heaters are not required for constant room
temperature above 35°F (2°C) .
Always trap evaporator drain line individually to prevent vapor
migration.
Ensure that the drain line has sufficient slope for proper drain -
age (prevention of ice build up/blockage in pan).
PIPING
Refrigeration grade piping must be used for all field refrigeration
piping. Refrigerant line sizes are important and may not be the
same size as the coil connections. Consult ASHRAE handbook or
other similar reference book for proper line sizing.
Refrigerant piping and control system should be designed to
prevent possible liquid slugging (from oil or refrigerant) of the
compressors on start-up after the defrost cycle. Also, it should
prevent oil logging and minimize refrigerant pressure drop.
For hot gas models, refer to pages 45 - 46 for recommended
piping.
WIRING
Wire system in accordance with governing standards and local
codes. Refer to data and wiring diagrams on throughout this pub-
lication for typical wiring arrangement. Electrical wiring is to be
sized in accordance with minimum circuit ampacity rating (MCA).
Size fuses used must not exceed the Maximum Fuse Size ratings.
For ease of identifying the proper wiring terminal, unit wiring is
color coded and terminal block connections are identified.
When fan delay thermostats (combination fan delay and defrost
termination) are installed, on start-up, the fans do not operate un-
til the coil temperature is reduced to approximately 25
o
F (-4°C) . It
is normal for the fans to cycle a few times until the room temper-
ature is brought down. At higher evaporating temperatures this
control may not close and therefore should either be by-passed
temporarily or replaced with an adjustable type. (set for a higher
temperature cut-in point).
MAINTENANCE
The unit should be periodically inspected for any dirt or ice build-
up on the fin surface and cleaned if
necessary with a soft whisk or brush. Also ensure coils inner
(and outer) drain pans do not have any ice build-up from improper
defrost operation. When replacing heater elements first remove
heater retainer brackets and heater clips.
SYSTEM CHECK
Before Start-Up:
1. All wiring should be in accordance with local codes.
2. Refrigerant lines should be properly sized.
3. All systems preferably include a liqud line solenoid valve at
immediately up stream of the expansion valve.
4. Thorough evacuation and dehydration has been performed.
5. The suction, discharge, and receiver service valves must be
open.
6. The system preferably include a liquid line filter 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 oil level to be sure the oil charge is correct.
2. On initial start up the fans do not start until coil temperature
is pulled down to approximately 25°F (-4 °C) on the coil. Also, it
is normal for the fan to cycle a few times until the room tempera-
ture is pulled down.
3. If necessary, temporarily by-pass fan delay control (to run fans
until room temp is lowered).
4. Be sure that the expansion valve is properly set to provide the
correct amount of superheat.
5. After the box temperature is close to reaching the desired tem-
perature, the evaporator superheat mustbe checked and adjust-
ment made if necessary.
In general, evaporators running with a TD of 10°F (5.6 °C )
should have a superheat reading of 6° to 8°F (3.3 °C to 4.4 °C) .
For evaporators with another T.D., the general rule is that the
superheat should be around 60 to 80% of T.D.
6. Heavy moisture loads are usually encountered when starting
the system for the first time. This may cause a rapid build-up of
frost on the evaporator. During the initial pull down, we suggest
that the frost build-up be watched and defrosted manually as
required.
7. Observe that the system goes through at least one
complete DEFROST CYCLE.
INSTALLATION INSTRUCTIONS KLP - LOW PROFILE EVAPORATORS