KeepRite KLP Series, Данные о продукте и установка

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K30-KLPD-PDI-4
14/10/20 - 30 -
INSTALLATION
The installation and start-up of evaporators should only be
performed by qualified refrigeration mechanics. This equipment
should be installed in accordance with all applicable codes, ordi-
nances and local by-laws.
INSPECTION
Inspect all equipment before unpacking for visible signs of dam-
age 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 car-
rier, 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.
APPLICATION
LP evaporators are designed for walker-in cooler and freezer ap-
plications used with wide range of refrigerants. For room tempera-
tures above 35°F (2 °C) AND evaporating temperatures above 26°F
(-3 °C) , positive defrosting means (with electric or hot gas) may not
be required, otherwise, electric defrost or hot gas defrost mod-
els should be used. Electric defrost models come with defrost
termination and fan delay as standard to control the defrost cycle
termination and fan delay, while defrost initiation means (e.g.
defrost timer) is not included.
The coil must not be exposed to any abnormal atmospheric or
acidic environments. This may result in corrosion to the cabi-
net and possible coil failure (leaks). (Consult manufacturer for
optional baked on phenolic protective coatings).
LOCATION
The unit location in the room should be selected to ensure
uniform air distribution throughout the entire space to be refriger-
ated. Be sure that the product does not obstruct the free circula-
tion of air. Allow a minimum of 24” clearance at each end. Do not
locate evaporators over doors. Consideration should be given to
the coil location in order to minimize the piping run length to the
condensing unit and floor drain.
EXPANSION VALVE (TXV) SELECTION
All units require the use of an externally equalized expansion
valve. (A 1/4” (6 mm) O.D. equalizer line has been provided on the
coil) TX valves should not be selected strictly by their nominal ton
rating. (This rating is based at a specific pressure differential and
entering liquid temperature). Since applications will differ it is
suggested the following selection procedure be followed.
1. Determine actual evaporator capacity.
The nominal rating is based at 10°F T.D. (5 .6°C) (Entering Air
Temp. minus Evap. Temp.) Note that a higher/lower operating
T.D.will increase / decrease this capacity rating by their direct
ratio within a range of 8 to 12°F (4 .4 to 8.3°C) T.D.
2. Determine the pressure drop across the valve by subtracting the
evaporating pressure and distributor pressure drop from the high
side liquid pressure.
The distributor pressure drop is typically in the range of 20 to
35 psig (1.4 to 2.4 bar) depending on the type of refrigerant and
operating conditions.
3. Estimate entering liquid temperature. Temperatures lower than
100
°
F (38 °C) increase valve capacity ratings. Refer to valve manu-
facturer’s specs for details.
4. Select valve from the valve manufacturer selection charts for
the appropriate refrigerant, evaporating temp and pressure drop.
For best performance, the outlet of the expansion valve should be
installed directly to the distributor body. If this is not possible, a
straight tube up to 12 inches may be used for the connection.
Locate the expansion valve bulb on a horizontal length of suction
line preferably 3 to 6 inches from the suction header. Locate the
bulb at 4 or 8 clock position and insulate with a waterproof type
of insulation. Clamp the bulb to ensure 100% contact of the bulb
with the suction line.
Ensure appropriate nozzle has been installed in the distributor
before installing valve. After following the manufacturer’s instal-
lation instructions and after the room has reached the desired
temperature the valve superheat should be checked. This will
confirm that the evaporator is operating properly and performing
to maximum efficiency. The superheat should be around 6 (3.3 ° C)
to 8°F (4.4 ° C) for a 10 to 12°F T.D (5.6 to 6.7 ° C) . Too high or low
a super heat will result in unsatisfactory system performance and
possible compressor problems.
NOZZLE INSTALLATION
For common applications (Medium temp. R404A/R22/ R407A/
R448A, 8 to 12°F (4 .4 to 6.7°C) T.D.; low temp. R404A/R407A/
R448A, 8 to 12°F (4 .4 to 6.7°C) T.D.) the nozzle for all models
has been factory installed. For other applications, refer to nozzle
manufacturer’s selection guide. To replace a nozzle, the nozzle
retainer clip (in distributor) must be removed before inserting
nozzle. Re-install clip ensuring nozzle is properly in place. A small
nozzle can be drilled larger using the drill size listed in table
on page 35 . Ensure the hole must be accurately centered and
smooth. A lathe is preferred for the drilling.
MOUNTING
Refer to dimensional drawing for recommended mounting arrange-
ments. Ensure adequate clearance is provided behind the coil as
well as each end. The evaporators may be mounted flush with ceil -
ing with bolts, or hanging down with rod hangers. When using rod
hangers, allow adequate space between the top of the unit and
the ceiling for cleaning to comply with NSF Standard 7.
Ensure that the ceiling is level since the drain pan has been
sloped for drainage during the defrost cycle.
INSTALLATION INSTRUCTIONS KLP - LOW PROFILE EVAPORATORS