Capacities rated using R404A with 10° F (5.6°C) TD & 100°F (38°C) liquid temperature.
Capacities at other TD within a range of 8 to 15°F (4.4 to 8.3°C) are directly proportional to TD, or use formula:
CAPACITY = (RATED CAPACITY / 10) x TD
* Derate capacity by 5% when using EC Motors
‡ When using R407C, the factor above is to be used when matching to condensing units with Dew Point ratings. This factor will ensure that proper
system balancing will occur to compensate for glide to t the application. If the system is sized correctly, one may expect a slight increase in system
capacity, along with slightly higher saturated suction temperatures.
Careful inspection of all parts when received for
loss or damage in transit is very 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.
Electrical characteristics should also be checked at
this time to ensure that they are as ordered.
APPLICATION
Two-Way evaporators are designed for use in
coolers and freezers such as reach in boxes, dis-
play cases, back bars, walk-in rooms and any other
cooler applications where a low velocity, uniform air
ow is required. The compact and low height unit
provides maximum useable product storage space.
At room temperatures above 34 °F (1.1
evaporating temperatures no lower than 27 °F (-2.8
°C) the air owing through the coil will accomplish
the defrost (Air Defrost).
At room temperatures 34
positive defrosting is required (Electric defrost).
These will require the use of :
1. Time Clock (to initiate and terminate the defrost
cycle),
2. Defrost termination thermostat (to prevent
unnecessary prolonged heating and steaming of the
coil once all the frost and ice has melted). And if a
freezer,
3. Fan delay thermostat (to prevent evaporator fans
starting up right away and blowing water on to the
fan blades, guards and oor).
This evaporator coil must not be exposed to any
abnormal environments (acidic or caustic) that can
result in coil corrosion and leaks. Consult factory
for optional baked on phenolic protective coatings.
These evaporators are for use primarily on R22 and
R404A refrigerants and their approved alternatives /
replacements.
INSTALLATION
The installation and start up of evaporators should
only be performed by qualied refrigeration
mechanics. This equipment should be installed in
accordance with all applicable codes, ordinances,
and local by-laws.
o
F and below (to -10
o
C) and
o
F)
LOCATION
The evaporator is designed to be mounted to the
ceiling of the box or cabinet. Refrigeration piping and
electrical connections are routed to the rear sides
(through the knock-outs). The unit must be mounted
to a level ceiling to ensure complete drainage from
the condensate pan to the drain tting. Refer to the
dimensional drawings for the drain tting and
mounting location details.
On freezer applications it is important that warm,
humid inltrated air is not drawn directly towards
the evaporator. Keeping the evaporator away
from the door, using strip curtains, and using door
switches to lock out and de-energize the liquid solenoid valve are all effective methods to minimize any
unnecessary frost build -up of the fan guard. (Air
enters the fan and discharges out each side of the
coil).
TXV SELECTION (thermostatic expansion valve)
For normal operating conditions refer to the TXV
selection chart. When selecting valves ensure they
are sized to meet the capacity at the actual evaporating temperature, liquid temperature and operating
TD of the system . All these conditions can greatly
affect the size and selection. Consult the factory or
valve manufacturer for assistance. All models that
use a distributor (larger models) must use a nozzle.
Smaller models do not have distributors or nozzles.
The TXV superheat setting should NOT be initially
adjusted . After the room has reached or is close to
the required operating temperature the TXV super-
heat should then be checked and only adjusted if
necessary. Refer to Section on SYSTEM CHECK.
To avoid overheating the valve or distributor
wrap a wet cloth around the valve diaphragm
and body.
MOUNTING
Mounting brackets with 7/32 - 5/16” diameter holes
are provided for ush mounting to the ceiling.
Ensure the evaporator is located correctly with
the air owing in the two desired directions. Avoid
discharging the air directly on to glass doors or door
openings.
After mounting the coil check the slope of the
drain pan with a level. If the ceiling is not level the
drain pan slope may not be correct which can result
in defrosting (ice-up) problems.
Page 14
INSTALLATION INSTRUCTIONS (CONT’D)
K30-KTL-PDI-3
- 14 -
06/01/12
KTL
DRAIN LINE
The drain line should be run from the drain
connection, sloping at least 4” vertical drop for
every foot of horizontal distance . A trap outside
the room will allow proper draining throughout the
line. Connection should be made to proper drainage
facilities that comply with local codes and regulations.
In freezers, to prevent drain line freeze up prob-
lems, the line must be heated and insulated. A heat
input of 20 W per foot in a 0 °F room and 30 W
per foot in a -20 °F room is usually satisfactory.
Once the line has been completed , double check
the slope in the drain pan to ensure proper drainage
(prevention of ice build-up on pan).
PIPING
Refrigerant line sizes are important and are not
necessarily the same size as the connections at the
condensing unit or evaporator. If in doubt refer to
a recognized source. (Manufacturer’s Engineering
Manual, Ashrae Manuals, etc.)
WIRING
Wire system in accordance with local codes and
regulations. A 36” cord is provided for single fan air
defrost models (AD). Multiple fans have a junction
terminal box for conduit connections.
60Hz
When fan delay thermostats are installed the fans
may not start up until the coil temperature
reaches approximately 26 °F. On initial start up it may
be necessary to bypass (jumper) this control
temporarily until the coil is cold enough.
SYSTEM CHECK
Before Start Up:
1. Ensure wiring is in accordance with codes.
2. Refrigerant lines are properly sized and routed.
3. Thorough leak check, evacuation and dehydration
has been performed.
4. Drain line has been checked for free ow.
After Start Up:
1. Fan has been checked for correct air ow and no
obstructions.
2. Expansion valve superheat has been checked for
proper operation. (Superheat of the coil should be
around 5 to 6 °F for a 10 °F TD.)
MAINTENANCE
The unit should be periodically inspected for any dirt
or build up on the n surface and cleaned if
necessary with a soft whisk or brush.
The fan motor is permanently lubricated and should
The terms and conditions as described below in the General Warranty Policy cover all products
manufactured by National Refrigeration.
GeneraL Warranty PoLiCy
Subject to the terms and conditions hereof, the Company warrants all Products, including Service
Parts, manufactured by the Company to be free of defects in material or workmanship, under nor-
mal use and application for a period of one (1) year from the original date of installation, or eighteen
(18) months from the date of shipment from the Company, whichever occurs rst. Any replacement
part(s) so supplied will be warranted for the balance of the product’s original warranty. The part(s) to
be replaced must be made available in exchange for the replacement part(s) and reasonable proof
of the original installation date of the product must be presented in order to establish the effective
date of the warranty, failing which, the effective date will be based upon the date of manufacture plus
thirty (30) days. Any labour, material, refrigerant, transportation, freight or other charges incurred in
connection with the performance of this warranty will be the responsibility of the owner at the cur-
rent rates and prices then in effect. This warranty may be transferred to a subsequent owner of the
product.
this Warranty does not CoVer
(a) Damages caused by accident, abuse, negligence, misuse, riot, re, ood, or Acts of God (b) damages
caused by operating the product in a corrosive atmosphere (c) damages caused by any unauthorized
alteration or repair of the system affecting the product’s reliability or performance (d) damages caused
by improper matching or application of the product or the product’s components (e) damages caused by
failing to provide routine and proper maintenance or service to the product (f) expenses incurred for the
erecting, disconnecting, or dismantling the product (g) parts used in connection with normal maintenance,
such as lters or belts (h) products no longer at the site of the original installation (i) products installed
or operated other than in accordance with the printed instructions, with the local installation or building
codes and with good trade practices (j) products lost or stolen.
No one is authorized to change this WARRANTY or to create for or on behalf of the Company any
other obligation or liability in connection with the Product(s). There is no other representation, warranty
or condition in any respect, expressed or implied, made by or binding upon the Company other than
the above or as provided by provincial or state law and which cannot be limited or excluded by such
law, nor will we be liable in any way for incidental, consequential, or special damages however caused.
The provisions of this additional written warranty are in addition to and not a modication of or subtraction
from the statutory warranties and other rights and remedies provided by Federal, Provincial or State laws.
PROJECT INFORMATION
System
Model NumberDate of Start-Up
Serial NumberService Contractor
Page 16
“AS BUILT” SERVICE PARTS LIST
06/01/12
Service Parts List
Label
To Be Attached
HERE
NATIONAL REFRIGERATION &
AIR CONDITIONING CANADA CORP.