KTM105LKTM124LKTM153LKTM188LKTM210LKTM235LKTM265L
Number of Fans2233445
CapacityBTUH (watts)
011240132701637020120224702515028360
(-17.8)(3294)(3889)(4798)(5897)(6585)(7371)(8311)
-1010920129001591019550218402444027560
Evap
Temp
°F (°C)
Air Flow
CFM (L/s)
Refrigerant Charge*
R404A
*R404A @ +25 °F S.S.T. with coil 30% full of liquid
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
(-23.3)(3200)(3781)(4663)(5730)(6401)(7163)(8077)
-1510710126501561019180214202397027030
(-26.1)(3139)(3707)(4575)(5621)(6278)(7025)(7922)
-2010500124001530018800210002350026500
(-28.9)(3077)(3634)(4484)(5510)(6154)(6887)(7766)
2020190030302850370037804630
(953)(897)(1430)(1345)(1746)(1760)(2185)
2.12.83.14.24.25.25.2
Lbs (Kg)
(1.0)(1.3)(1.4)(1.9)(1.9)(2.4)(2.4)
‡ 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.
* For low temp. R-507, refrigerant designation changes from ‘SC’ to ‘PC’.
R404A
R507
Page 15
REVERSE CYCLE DEFROST
ELECTRIC DRAIN PAN HEATER
EVAPORATOR COIL
G
OPT1
FACTORY PIPING
CHECK VALVE SHIPPED LOOSE
CHECK
VALVE
DISTRIBUTOR
TXV
REVERSE CYCLE DEFROST
HOT GAS
ENTERING
ELECTRIC DRAIN PAN HEATER
STD-G
FACTORY PIPING
LEAVING
HOT GAS
WITH CHECK VALVE LOOSE
EVAPORATOR COIL
DISTRIBUTOR
CHECK
VALVE
ENTERING
HOT GAS
WITH DRAIN PAN HEATERWITH DRAIN PAN HEATER
WITH TXV FACTORY INSTALLED
HOT GAS
LEAVING
KTM
K30-KTM-PDI-3
- 15 -
08/14/12
FAN/HEATER CONTROL AND DEFROST
TERMINATION CONTROL POSITION
60Hz
HOT GAS DEFROST (REVERSE CYCLE)
Page 16
KTM
K30-KTM-PDI-3
- 16 -
08/14/12
INSTALLATION INSTRUCTIONS
60Hz
INSTALLATION
The installation and start-up of Two-Way Unit Coolers should only
be performed by qualied refrigeration mechanics.
This equipment should be installed in accordance with all applica-
ble codes, ordinances 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
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 led 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
Two-Way Unit Coolers are designed for use in coolers and freez-
ers such as reach in boxes, 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
peratures no lower than 27
coil will accomplish the defrost (Air Defrost).
At room temperatures 34
frosting 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 unit coolers are for use primarily on R134a, R22
and R404A refrigerants and their approved alternatives / replacements.
o
F (1.1 oC) and evaporating tem-
o
F (-2.8 oC) the air owing through the
o
F and below ( to -10 oF) positive de-
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. Two-Way Unit Coolers draw air
through the fans and discharge air through both coils.
Consideration should be given to the coil location in order to
minimize the piping run length to the condensing unit and oor
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 specic
pressure differential and entering liquid temperature). Since
applications will differ it is suggested the following selection
procedure be followed.
1. Determine actual unit cooler BTUH or KW (thermal).
The nominal rating is based at 10
(Room Temp. minus Evap. Temp.). Note that a higher /
lower operating T.D.will increase / decrease this capacity
rating by their direct ratio.
2. Determine the pressure drop across the valve by
subtracting the suction (evaporating) pressure from the
high side liquid pressure. Note: Also subtract the
distributor pressure loss (use approx. 25 psig (1.1 bar)
for R134a and 35 psig (2.4 bar) for R22, R404A, R507).
3. Estimate entering liquid temperature. Temperatures
lower than 100
ratings. Refer to valve manufacturer’s specs for details.
4. Select valve from the valve manufacturer selection charts
for the appropriate refrigerant, evaporating temp and
pressure drop.
5. After following the manufacturer’s installation instructions
and after the room has reached the desired temperature
the valve superheat should be checked. This will conrm
that the evaporator is operating properly and performing
to maximum efciency. The superheat should be
around 5 (2.7°C) to 8
(5.5 to 6.6°C) T.D. Too high or low a super heat will result
in unsatisfactory system performance and possible
compressor problems.
°
F (37.7 °C) increase valve capacity
O
F (4.4°C) for a 10 to 12 OF
O
F T.D. (5 .5°C)
NOZZLE INSTALLATION
All Two-Way unit coolers have nozzles installed at factory. For
nozzle selection refer to selection table. In case it is required to
install the nozzle at some point in the future, the nozzle retainer
clip (in distributor) must be removed before inserting nozzle.
Re-install clip ensuring nozzle is properly in place.
Page 17
KTM
K30-KTM-PDI-3
- 17 -
08/14/12
INSTALLATION INSTRUCTIONS (cont’d)
60Hz
MOUNTING
Refer to dimensional drawing for recommended mounting ar-
rangements. Formed mounting channels are provided for ush
mounting to the ceiling. Ensure adequate clearance (at least
24” (600 mm)) is provided at each end (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 1/4” (6 mm) per foot. A trap in a warm area outside the
room will allow proper draining through the tubing. 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
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 (-2.2°C)
room, is satisfactory. Drain line heaters are not required for
constant room temperature above 35°F (1.6°C).
Ensure that the drain line has sufcient slope for proper
drainage (prevention of ice build up/blockage in pan).
o
F (1.7 °C) or lower, the drain line should be heated
PIPING
Refrigerant line sizes are important and may not be the same
size as the coil connections. Consult “Recommended refriger-
ant line sizes” charts in any standard 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. On Hot Gas
Defrost Systems the suction accumulator should be at least 2.5
times the coils operating charge.
See Dimensional data for line locations. Reverse Cycle mod-
els include a check valve (unmounted) packaged along with
the nozzle in the refrig. connection compartment end panel.
WIRING
Wire system in accordance with governing standards and local
codes. See data and wiring diagrams on pages 7 to 12 for wir-
ing arrangement. Electrical wiring is to be sized in accordance
with minimum circuit ampacity rating (MCA).
For ease of identifying the proper wiring terminal, unit wiring is
color coded and terminal block connections are identied.
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 and electric defrost systems preferably
must include a liqud line solenoid valve and suction
accumulator.
4. Thorough evacuation and, dehydration has been
performed.
5. The suction, discharge, and receiver service valves must
be open.
6. The system preferably must include a liquid line drier
moisture indicator and suction lter.
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 35 °F (1.7 °C)
on the hot gas coil. Also, it is normal for the fans to cycle a
few times until the room temperature is pulled down.
3. Fan/Heater control and defrost termination control is
factory installed for reverse cycle defrost operation.
4. In general, evaporators running with a TD of 10 °F should
have a superheat reading of 5° to 8 °F (2.7 °C to 4.4 °C).
For evaporators with a higher TD, the superheat should be
8° to 12°F (4.4 °C to 6.6 °C).
5. Heavy moisture loads are usually encountered when
starting the system for the rst time. This will cause a rapid
build-up of frost on the unit cooler. During the initial pull
down, we suggest that the frost build-up be watched and
defrosted manually as required. This may be done by
rotating the inner dial on the timer until the pin in the outer
dial is directly opposite the timer pointer. (Paragon 8145-
20 Timer by others).
6. Observe that the system goes through at least one
complete DEFROST CYCLE.
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. Also ensure coils inner and outer drain pans
do not have any ice build-up from improper defrost operation.
When replacing heater elements rst remove heater retainer
brackets and heater clips.
Terminal Board - 1048825
Fan Delay / Defrost Terminaltion Control - 1071280 ( electric defrost models only)
Fan Delay / Heater Control - 1073640 (hot gas models only)
LOW
TEMP
Motor
115V
Motor
230V
Fan
Blade
Motor
115V
Motor
230V
Fan
Blade
Fan
Guard
60Hz
Wire
Harness
* Drain Pan
Heater
(if appl)
Page 19
Finished Goods Warranty
K30-KTM-PDI-3
- 19 -
08/14/12
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
RefrigerantPhone
Electrical SupplyFax
Page 20
“AS BUILT” SERVICE PARTS LIST
08/14/12
Service Parts List
Label
To Be Attached
HERE
NATIONAL REFRIGERATION &
AIR CONDITIONING CANADA CORP.