Midea MRC-24CWN1-M13L User manual

INSTALLATION INSTRUCTIONS
PACKAGE HEAT PUMP & AIR CONDITIONER
WARNING
These instructions are intended as an aid to qualified,
licensed service personnel for proper installation,
adjustment and operation of this unit. Read these
instructions thoroughly before attempting installation
or operation. Failure to follow these instructions may
result in improper installation, adjustment, service or
maintenance possibly resulting in fire, electrical shock,
property damage, personal injury or death.
RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY INFORMATION
DO NOT DESTROY THIS MANUAL
Please read carefully and keep in a safe place for future reference by a serviceman.
FEATURING R-410A
13 SEER SERIES - (2-5Tons)

TABLE OF CONTENTS
LIST OF TABLES
LIST OF FIGURES

3
This document is customer property and is to remain with this unit.
These instructions do not cover all the different variations of systems nor
does it provide for every possible contingency to be met in connection with
installation.
All phases of this installation must comply with NATIONAL, STATE and
LOCAL CODES. If additional information is required please contact your local
distributor.
1.0 SAFETY
WARNING
These instructions are intended as an aid to qualified, licensed service
personnel for proper installation, adjustment and operation of this unit. Read
these instructions thoroughly before attempting installation or operation.
Failure to follow these instructions may result in improper installation, adjust-
ment, service or maintenance possibly resulting in fire, electrical shock, prop-
erty damage, personal injury or death.
WARNING
The manufacturer’s warranty does not cover any damage or defect to the
heat pump caused by the attachment or use of any components, accesso-
ries or devices (other than those authorized by the manufacturer) into, onto
or in conjunction with the heat pump. You should be aware that the use of
unauthorized components, accessories or devices may adversely affect the
operation of the heat pump and may also endanger life and property. The
manufacturer disclaimer any responsibility for such loss or injury resulting
from the use of such unauthorized components, accessories or devices.
WARNING
Disconnect all power to the unit before starting maintenance. Failure to do
so can result in severe electrical shock or death.
WARNING
Do not, under any circumstances, connect return ductwork to any other heat
producing device such as a fireplace insert, stove, etc. Unauthorized use of
such devices may result in fire, carbon monoxide poisoning, explosion,
property damage, severe personal injury or death.
WARNING: This is a safety alert symbol indicating a potential hazard-
ous situation, which could result in personal injury, property and/or
product damage or death.
CAUTION: This is a safety alert symbol indicating a potential hazard-
ous situation, which could result in moderate personal injury, property
and/or product damage.
When you see the symbols below on the labels or in the manuals, be alert to
the potential or immediate hazards of personal injury, property and/or product
damage. It is the owner’s or installer’s responsibility to comply with all safety
instructions and information accompanying these symbols.

4
WARNING
The unit must be permanently grounded. A grounding lug is provided. Failure to
ground this unit can result in fire or electrical shock causing property damage,
severe personal injury or death.
WARNING
Only electric heater kits supplied by this manufacturer as described in this
publication have been designed, tested, and evaluated by a nationally recog-
nized safety testing agency for use with this unit. Use of any other manufac-
tured electric heaters installed within this unit may cause hazardous conditions
resulting in property damage, fire, body injury or death.
WARNING
Proposition 65: This appliance contains fiberglass insulation. Respirable
particles of fiberglass are known to the state of California to cause cancer.
As soon as unit is received, it should be inspected and noted for possible shipping
damage during transportation. It is carrier’s responsibility to cover the cost of
shipping damage. Manufacturer or distributor will not accept the claims from dealer
for any transportation damage.
1.1 INSPECTION
Refer to Fig. 2-2, 2-3 for unit physical data and to Table 6-1 & 6-2 for electrical
data.If components are to be added to a unit they must meet local codes, they are
to be installed at the dealer’s and /or the customer’s expense.
Size of unit for proposed installation should be based on heat loss / heat gain
calculations made in accordance with industry recognized procedures identified
by the Air conditioning contractors of America.
1.2 LIMITATIONS
2.0 INSTALLATION
2.1 PRE-INSTALLATION
Before installation, carefully check the following:
1. Unit should be installed in accordance with national and local safety codes,
including but not limit to ANSI/NFPS No. 70 or Canadian Electrical Code Part 1,
C22.1, local plumbing and wastewater codes and any other applicable codes.
2. For rooftop installation, be sure the structure has enough strength to support
the weight of unit. Unit should be installed on roof curb and leveled.
3. For ground level installation, a level slab should be used.
4. Condenser airflow should not be restricted.
5. On applications when a roof curb is used, the unit must be positioned on the
curb so the front of the unit is tight against the curb.

* The above figure for reference purpose only.
5
2.2 CLEARANCE
All units require certain clearance for proper operation and service. Refer to
Table 2-1 for the clearances required for construction, servicing and proper
unit operation.
2.3 RIGGING AND HANDING
Exercise care when moving the unit. Do not remove any packaging until the
unit is near the place of installation. Rig the unit by attaching chain or cable
slings to the lifting holes provided in the base rails. Spreader bars, whose
length exceeds the largest dimension across the unit, MUST be used across
the top of the unit.
CAUTION
Before lifting, make sure the unit weight is distributed equally on the rigging
cables so it will lift evenly.
Units may be moved or lifted with a forklift. Slotted openings in the base rails
are provided for this purpose.
All panels must be secured in place when the unit is lifted.
The condenser coils should be protected form rigging cable damage with
plywood or other suitable material.
CAUTION
Fig. 2-1 Component Location
Compressor
Highly efficient enhanced
copper tube / aluminum fin
indoor coil
Compressor
contactor
Low voltage
terminal block
Blower motor with
slide-out blower assembly
Decorative
protective coil
guard
Heavy gauge removable
base rails
Condenser fan motor
Electric heater assembly (optional)
Highly efficient enhanced copper
tube/Aluminum fin outdoor coil

6
Electrical service access
compapartment panel Condensate drain
connection 3/4” NPTI
(Trap required)
Left
Condenser coil
Front
Fig. 2-2 Unit Dimensions
Low vlotage entrance 7/8” Dia.
High voltage conn. 1-23/64” Dia.
Unit size：
024, 036
* The above figure for reference purpose only.
Hi./Lo. pressure
detected valve
1/4’’ SAE
Side supply
air opening
Side return
air opeing
14-1/2"
3-55/64"
14-1/2"
2-31/32"
14-1/2" 4-17/64"
51-29/64"
24-13/16"
2-3/8"
3-23/32"
5-1/2"
2-31/32"
18-29/32"
37-23/32"
19"

7
Fig. 2-3 Unit Dimensions
Electrical service access
compapartment panel
Condensate drain
connection 3/4” NPTI
(Trap required)
Front
Left
Unit size：
048, 060
Condenser coil
Side supply
air opening
Side return
air opeing
* The above figure for reference purpose only.
Low vlotage entrance 7/8” Dia.
High voltage conn. 1-23/64” Dia.
Direction Distance (in.)
Direction Distance (in.)
Top
Front
Rear
Right
Left
Bottom
30
60
18
12
24
0
Duct clearance: 1 inch clearance for all sides of air supply duct.
1. Units must be installed outdoors. Over hanging structure or shrubs should not obscure condenser air discharge outlet.
2. The minimum clearance without economizer/fresh air damper. For distance with Economizer/fresh air damper, please refer to the
relevant Install requiremnt.
3. Units may be installed on combustible floors made from wood or class A, B or C roof covering materials.
Table 2-1: Unit Clearance
NOTE
For units applied with a roof curb, the minimum clearance may be reduced from 1 inch to 1/2 inch between
combustible roof curb material and this supply air duct.
1
32
Hi./Lo. pressure
detected valve
1/4’’ SAE
14-1/2"
33-3/64"
2-3/8"
5-1/2"
2-31/32"
21-7/8" 57-61/64"
4-17/64"
14-1/2" 14-1/2" 4-49/64"
19"
42"
5-11/16"
3-23/32"

8
3.0 DUCTWORK
NOTE
On ductwork exposed to outside air conditioning space, use at least 2” of
insulation and a vapor barrier. Flexible joint may be used to reduce noise.
4.0 CONDENSATE DRAIN CONNECTION
1. Use female NPT threaded fitting for outside connection and make sure that
drain holes are not blocked.
2. Insulation may be needed for drain line to prevent sweating.
3. Drain pan has two drain connections on each side to provide flexibility of
connection and drainage. Make sure proper pitch and plugging if second
connection is not used.
4. Use a sealing compound on male pipe threads. Install the condensate
drain line (NPT) to spill into an open drain.
A closed return duct system shall be used. This shall not preclude use of
economizers or ventilation air intake. Flexible joints may be used in the
supply and return duct work to minimize the transmission of noise.
When fastening duct work to the side duct flanges on the unit, insert the
screws through the duct flanges only. DO NOT insert the screws through
the casing. Outdoor duct work must be insulation and waterproofed.
CAUTION
NOTE
Be sure to note supply and return openings. Refer to Fig. 2-2 and 2-3
for information concerning supply and return air duct openings.
Consult local codes for special requirements.
To provide extra protection from water damage, install an additional drain pan,
provided by installer, under the entire unit with a separate drain line. Manufac-
turer will not be responsible for any damages due to the failure to follow these
requirements.
4.1 INSTALL DRAIN PIPE
Duckwork should be made and sized by installer and in accordance with Air
Manual from Conditioning Contractors of America and local codes.

9
6.1 POWER WIRING
1. Proper electrical power should be available at unit. Voltage tolerance should not
be over 10% from rating voltage.
2. If any of the wire must be replaced, replacement wire must be the same type
as shown in nameplate, wiring diagram and electrical data sheet.
3. Install a branch circuit disconnect of adequate size to handle starting current,
located within sight of, and readily accessible to the unit.
4. ELECTRIC HEATER - If the Electric Heater is installed, unit may be equipped
with 30~60A. circuit breakers or fuse. These breaker(s) protect the internal wiring
in the event of a short circuit and serve as a disconnect. Circuit breakers installed
within the unit do not provide over-current protection of the supply wiring and
therefore may be sized larger than the branch circuit protection.
• Supply circuit power wiring must be 221 °F minimum copper conductors only.
See Electrical Data in this section for ampacity, wire size and circuit protector
requirements. Supply circuit protective devices may be either fuses or “HACR”
type circuit breakers.
• Two 1-3/8” knockouts on the back panel are provided for connection of power
wiring to electric heater.
• Power wiring is connected to the power terminal block in unit electric heater
cabinet.
See Electrical Heater Installation Instruction for details.
6.0 ELECTRICAL WIRING
Field wiring must comply with the National Electric Code (NEC) or Canadian
Electrical Code (CEC) and any applicable local ordinance.
WARNING
Disconnect all power to unit before installing or servicing. More than one
disconnect switch may be required to de-energize the equipment. Hazard-
ous voltage can cause severe personal injury or death.
Units are shipped without a filter or filter racks. It is the responsibility of the
installer to secure a filter in the return air ductwork or install a filter/frame Kit.
Filter must always be used and must be kept clean. When filter become dirt
laden, insufficient air will be delivered by the blower, decreasing your units
efficiency and increasing operation costs and wear-and tear on the unit and
controls.
Filters should be checked monthly; this is especially important since this unit is
used for both heating and cooling.
5.0 FILTERS

10
• Make sure, after installation, separation of control wiring and power wiring
has been maintained.
6.2 GROUNDING
WARNING
The unit must be permanently grounded. Failure to do so can result in
electrical shock causing personal injury or death.
• Grounding may be accomplished by grounding metal conduit when installed in
accordance with electrical codes to the unit cabinet.
• Grounding may also be accomplished by attaching ground wire(s) to ground
lug(s) provided in the unit wiring compartment.
6.3 CONTROL WIRING
IMPORTANT: Class 2 low voltage control wiring SHOULD NOT be run in
conduit with main power wiring and must be separated from power wiring,
unless class 1 wire of proper voltage rating is used.
• Low voltage control wiring should be 18 AWG color-coded. For lengths
longer than 50 ft, 16 AWG wire should be used.
• Two 7/8” holes can be used for control wires going into the unit, one on left
side and one at the bottom.
Thermostat should be mounted on an inside wall about 58” from floor and
will not be affected by unconditioned air, sun and/or heat exposure. Follow
the instruction carefully because there are many wiring requirements.
See Fig. 6-1 ~ 2, Table 6-1 ~ 2