“As Built” Service Parts..................................................................................................
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Page 2
NOMENCLATURE
04/08/16
T30-TMP-PDI-12
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T MP 3 48 L E - T5 A
T = Trenton
Medium Prole Evaporator
Number of Fans
Nominal Capacity:
x 1000 @ 10°F TD, Btu/H, R404A
Application Range:
M = Medium to High Temp 6 FPI (10°F to 45°F Evap Temp) *
L = Low Temp 6 FPI (-40°F to 0°F Evap Temp)
V = Low Temp 4 FPI (-40°F to 0°F Evap Temp)
W = Fluid Air Cooler (with water or glycol)
* except “488M”, which is 8 FPI
A = Air E = Electric
T = 3 Pipe Hot Gas w/ Electric Heater Pan
or Warm Fluid w/ Electric Heater Pan for Fluid Air Coolers
H = 3 Pipe Hot Gas w/ Hot Gas Loop Pan (optional)
G = Reverse Cycle w/ Electric Heater Pan
R = Reverse Cycle w/ Hot Gas Loop Pan (optional)
st
• Adjustable Fan Delay on medium temp.
Electric Defrost units
• Lower heater wattage
• High eciency and high strength fan guard
• Hinged doors
• Compact
• Internally enhanced tubing
• More uniform air ow
• Reverse cycle & 3 pipe hot gas available
• Ample electrical and header compartments
OPTIONAL FEATURES
• EC motors with patented SmartSpeed® Technology.
See page page 19
• Hot gas loop pan with hot gas defrost models
• Proven motor/fan/motor mount design
• Liquid line solenoid valve wire harness factory
installed
• Schrader valve on suction header
• Positive slope, hinged drain pan
• Central drain connections (approximate)
• Universal drain tting
• Large 3/4” ID (3/4” MPT) drain hole
• Wire fan guard
• Factory installed expansion valve,
solenoid valve and room thermostat
• 230/460V Variable Speed EC Motors
Page 3
TMP
04/08/16
T30-TMP-PDI-12
- 3 -
CAPACITY DATA - ALL MODELS
60Hz
Medium Temperature Models - Capacity @ 6 F.P.I. *
Medium Temp. Models118M122M228M236M245M355M368M480M488M *
Number Of Fans112223344
Low Temp. 4 FPI Models113V117V222V228V234V339V350V459V
Number Of Fans11222334
R407A
R407C
R404A
R507
R22
Capacity
BTUH
(WATTS)
Evap
Temp.
-20°F
(-29°C)
R134a
Air Flow CFM (L/S)
Refrigerant **
Charge
Capacities rated using 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.
For capacities at TD outside of range 8 to 15 °F (4.4 to 8.3°C), or liquid temperature lower than 75°F (24°), consult factory .
Capacities for R407A and R407C are based on mean temperature. Mean temperature is the average temperature between the saturated suction
temperature and the temperature feeding the evaporator. For dew point ratings, consult factory.
* CAPACITY CORRECTION FACTORS FOR LOW TEMPERATURE UNITS
NO CORRECTION FACTOR REQUIRED FOR MEDIUM TEMP. UNITS
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.
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 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
MP evaporators are designed for walk-in cooler, walk-in
refrigerated warehouse and food processing plant
applications used with a wide variety of refrigerants. For
room temperatures 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 models 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.
For other types of refrigerant, contact factory.
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).
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 product does not obstruct the
free circulation 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 oor drain.
based at a specic pressure dierential and entering liquid
temperature). Since applications will dier 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 T emp.
minus Evap. Temp.) Note that a higher / lower
T.D.will increase / decrease this capacity rating by their
direct ratio within a range of
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 manufacturer’s specs for details.
4. Select valve from the valve manufacturer selection
charts or software 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 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 eciency.
The superheat should be around 60 to 80% of T.D. Too
high or low a super heat will result in unsatisfactory system
performance and possible compressor problems.
8 to 12°F (4 .4 to 8.3°C) T.D.
operating
NOZZLE INSTALLATION
For common applications (Medium temp. R404A, R22,
R407A, 8 to 12°F (4 .4 to 6.7°C) T.D.; low temp. R404A/
R407A, 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 31. Ensure
the hole must be accurately centered and smooth. A lathe
is preferred for the drilling.
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
Page 34
TMP60Hz
04/08/16
T30-TMP-PDI-12
- 34 -
INSTALLATION INSTRUCTIONS (cont’d)
MOUNTING
Refer to dimensional drawing for recommended mounting
arrangements. Ensure adequate clearance is provided behind the coil as well as each end. The evaporators may be
mounted ush with ceiling 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.
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 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 35oF (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 sucient slope for
proper drainage (prevention of ice build up/blockage
in pan).
PIPING
Refrigeration grade piping must be used for all eld
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, see pages 38 to 39 for recommended
piping.
WIRING
Wire system in accordance with governing standards and
local codes. See data and wiring diagrams on pages 4 to
29 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
identied.
When fan delay thermostats (combination fan delay and
defrost termination) are installed, on start-up, the fans do
not operate until the coil temperature is reduced to approximately 25oF (-4°C). It is normal for the fans to cycle
a few times until the room temperature 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 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.
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 lter 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 25°F
(-4°C) on the coil. Also, it is normal for the fan to
cycle a few times until the room temperature 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 temperature, the evaporator superheat
must be checked and adjustment 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 rst 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.
Page 35
WITH HOT GAS DRAIN PAN LOOP
WITH CHECK VALVE LOOSE
HOT GAS
LEAVING
DEFROST LOOP
HOT GAS DRAIN PAN
VALVE
CHECK
REVERSE CYCLE DEFROST
EVAPORATOR COIL
DISTRIBUTOR
STD-R
FACTORY PIPING
HOT GAS
ENTERING
LEAVING
HOT GAS
WITH CHECK VALVE LOOSE
REVERSE CYCLE DEFROST
ELECTRIC DRAIN PAN HEATER
EVAPORATOR COIL
DISTRIBUTOR
STD-G
FACTORY PIPING
CHECK
VALVE
WITH DRAIN PAN HEATER
WITH CHECK VALVE LOOSE
WITH HOT GAS DRAIN PAN LOOP
STD-H
DEFROST LOOP
HOT GAS DRAIN PAN
HOT GAS
LEAVING
VALVE
CHECK
EVAPORATOR COIL
3-PIPE DEFROST
DISTRIBUTOR
FACTORY PIPING
ENTERING
HOT GAS
WITH CHECK VALVE LOOSE
VALVE
CHECK
STD-T
EVAPORATOR COIL
ELECTRIC DRAIN PAN HEATER
3-PIPE DEFROST
ENTERING
HOT GAS
DISTRIBUTOR
LEAVING
HOT GAS
FACTORY PIPING
WITH DRAIN PAN HEATER
TMP60Hz
04/08/16
T30-TMP-PDI-12
- 35 -
HOT GAS PIPING SCHEMATICS
STANDARD CONFIGURATIONS
Refer to Nomenclatuere for details
Standard Oering: All Models
Check Valve is included with the coil shipped loose as it is a must have component for system operation.
Check Valve & TXV - See next page (OPT 1)
When a TXV is ordered with a HG defrost coil: Its only option will be Factory Installed. The bypass check
valve will be factory installed as well as part of the same option.
• Reverse Cycle PanHeater (G Models) when ordered with TXV & Check Valve: o TXV, Check Valve and bypass Tee are factory installed
• Reverse Cycle PanLoop (R Models) when ordered with TXV & Check Valve: o TXV, Check Valve and bypass Tee are factory installed
• 3-Pipe PanHeater (T Models) when ordered with TXV & Check Valve: o TXV and Check Valve are factory installed
• 3-Pipe PanLoop (H Models) when ordered with TXV & Check Valve: o TXV and Check Valve are factory installed
Page 36
COMPLETE ASSY PROVIDED WHEN TXV IS MTD
WITH HOT GAS DRAIN PAN LOOP
CHECK VALVE MOUNTED
CHECK
DEFROST LOOP
HOT GAS DRAIN PAN
VALVE
REVERSE CYCLE DEFROST
EVAPORATOR COIL
DISTRIBUTOR
TXV
OPT1
FACTORY PIPING
R
LEAVING
HOT GAS
CHECK VALVE MOUNTED
COMPLETE ASSY PROVIDED WHEN TXV IS MTD
REVERSE CYCLE DEFROST
ELECTRIC DRAIN PAN HEATER
EVAPORATOR COIL
DISTRIBUTOR
CHECK
VALVE
TXV
G
OPT1
FACTORY PIPING
LEAVING
HOT GAS
WITH DRAIN PAN HEATER
ASSEMBLED OUTSIDE CABINET
WITH HOT GAS DRAIN PAN LOOP
CHECK VALVE MOUNTED
COMPLETE ASSY PROVIDED WHEN TXV IS MTD
HOT GAS DRAIN PAN
DEFROST LOOP
& SHIPPED SEPARATELY
REVERSE CYCLE DEFROST
EVAPORATOR COIL
CHECK
VALVE
DISTRIBUTOR
TXV
R
FACTORY PIPING
FIELD PIPING
ENTERING
HOT GAS
OPT2
LEAVING
HOT GAS
CHECK
VALVE
VALVE
OPT1
HOT GAS DRAIN PAN
DEFROST LOOP
(SUCTION LINE)
LEAVING
HOT GAS
ENTERING
HOT GAS
FACTORY PIPING
H
WITH HOT GAS DRAIN PAN LOOP
WITH TXV BY OTHERS OR FACTORY INSTALLED
WITH CHECK VALVE MTD. & CONNECTED TO LOOP
3 PIPE DEFROST
EVAPORATOR COIL
DISTRIBUTOR
TXV
CHECK
OPT1
WITH CHECK VALVE MOUNTED
WITH TXV BY OTHERS OR FACTORY INSTALLED
EVAPORATOR COIL
3 PIPE DEFROST
ELECTRIC DRAIN PAN HEATER
HOT GAS
(SUCTION LINE)
DISTRIBUTOR
LEAVING
CHECK
VALVE
TXV
FACTORY PIPING
T
ENTERING
HOT GAS
TMP60Hz
04/08/16
T30-TMP-PDI-12
- 36 -
HOT GAS PIPING SCHEMATICS
OPTIONAL CONFIGURATIONS
Refer to Nomenclatuere for details
Drain pan Loop Kit - See below (OPT 2)
Drain pan loop kit is an assembly that is fully assembled and shipped loose for eld installation outside the
cabinet. Two check valves are included, depending on the model size, one or both are factory installed.
• Reverse Cycle PanLoop (R Models) when ordered with TXV & Check Valve: o Suction line piping shipped as a pre-piped assembly for eld installation
Solenoid Valve
Solenoid valves are available as a shipped loose item
due to limited space inside the cabinet
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 normal 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 eective
date of the warranty, failing which, the eective 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 eect. 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 aecting 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 40
“AS BUILT” SERVICE PARTS LIST
04/08/16
Service Parts List
Label
To Be Attached
HERE
NATIONAL REFRIGERATION &
AIR CONDITIONING CANADA CORP.