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

11
CAUTION
Label all wire prior to disconnection when servicing controls. Wiring errors
can cause improper and dangerous operation. Verify proper operation after
servicing.
CONTACTOR
GROUND
LUG
Refer to electrical data tables
to size the disconnect
Field-supplied disconnect
Single
phase
power
supply
Fig. 6-2 Typical Field Power Wiring Diagram
R
G
Y
W
C
R
G
Y
W1
W2
C
24 volt
transformer
THERMOSTAT
UNIT CONTROL BOARD
THERMINAL STRIP
*** B wire be used with heat pump system only.
** Minimum wire size of 18 AWG wire should be used for all field installed
24 volt wire.
* Only required on units with supplemental electric heat.
Fig. 6-1 Typical Field Control Wiring Diagram
BB
240V
208V
COM
***
*
**

12
Table 6-2: 13 SEER Cooling only W/Without Electric Heat
1. Minimum Circuit Ampacity.
2. Maximum Over Current Protection per Standard UL 1995.
3. Fuse or HACR circuit breaker size installed at factory or field installed.
Table 6-1: 13 SEER Heat Pump W/Without Electric Heat
024T: GMCC compressor
036L/048L/060L: LG compressor
024T: GMCC compressor
036L/048L/060L: LG compressor
OD Fan
Motors
(each)
Supply
Blower
Motor
RLA LRA MCC FLA FLA Model kW Stages Amps
None - - None 14.5 20
EHK-05E 3.8/5 1 18.1/20.8 32.6/40.5 40/45
EHK-08E 5.6/7.5 1 27.1/31.3 41.6/53.6 50/60
EHK-08E 5.6/7.5 1 27.1/31.3 55.2/60.5 60/70
EHK-10E 7.5/10 1 36.1/41.7 50.6/66.6 60/70
None - - None 21.3 30
EHK-05E 3.8/5 1 18.1/20.8 44.0/47.3 50/50
EHK-10E 7.5/10 1 36.1/41.7 66.5/73.5 70/80
EHK-15E 11.3/15 2 54.2/62.5 89.1/99.5 90/100
None - - None 29.1 45
EHK-05E 3.8/5 1 18.1/20.8 47.2/55.1 60/60
EHK-08E 5.6/7.5 1 27.1/31.3 56.2/68.3 70/80
EHK-10E 7.5/10 1 36.1/41.7 65.2/81.3 80/90
EHK-15E 11.3/15 2 54.2/62.5 83.3/107.3 100/110
EHK-20E 15/20 2 72.2/83.3 101.3/133.3 125/150
None - - None 32.4 50
EHK-05E 3.8/5 1 18.1/20.8 50.5/58.4 70/70
EHK-08E 5.6/7.5 1 27.1/31.3 59.5/71.5 80/80
EHK-10E 7.5/10 1 36.1/41.7 68.5/84.5 90/90
EHK-15E 11.3/15 2 54.2/62.5 86.6/110.5 100/125
EHK-20E 15/20 2 72.2/83.3 104.6/136.5 125/150
Electric Heat Option
Max Fuse2/
Breaker3 Size
(Amps)
Compressors (each)
18.7A
0.95A
2.84A
060L
(5.0) 208/230-1-60 21.5A
Volt
Size
(Tons)
MCA1 (Amps)
036L
(3.0)
208/230-1-60
14.0A
70A
024T
(2.0)
208/230-1-60
9.7A
34.8A
15.1A
0.61A
1.71A
048L
(4.0)
208/230-1-60
19.0A
100A
29.6A
1.68A
3.66A
125A 33.5A 1.68A 3.82A
OD Fan
Motors
(each)
Supply
Blower
Motor
RLA LRA MCC FLA FLA Model kW Stages Amps
None - - None 14.5 20
EHK-05E 3.8/5 1 18.1/20.8 24.8/28.2 25/30
EHK-08E 5.6/7.5 1 27.1/31.3 36.1/41.3 40/45
EHK-08E 5.6/7.5 1 27.1/31.3 37.5/42.7 40/45
EHK-10E 7.5/10 1 36.1/41.7 47.3/54.3 50/60
None - - None 21.3 30
EHK-05E 3.8/5 1 18.1/20.8 26.2/29.6 30/30
EHK-10E 7.5/10 1 36.1/41.7 48.7/55.7 50/60
EHK-15E 11.3/15 2 54.2/62.5 71.3/81.7 80/90
None - - None 29.1 45
EHK-05E 3.8/5 1 18.1/20.8 27.2/30.6 30/40
EHK-08E 5.6/7.5 1 27.1/31.3 38.5/43.7 40/45
EHK-10E 7.5/10 1 36.1/41.7 49.7/56.7 50/60
EHK-15E 11.3/15 2 54.2/62.5 72.4/82.7 80/90
EHK-20E 15/20 2 72.2/83.3 94.9/108.7 100/110
None - - None 32.4 50
EHK-05E 3.8/5 1 18.1/20.8 27.4/30.8 30/40
EHK-08E 5.6/7.5 1 27.1/31.3 38.7/43.9 40/45
EHK-10E 7.5/10 1 36.1/41.7 49.9/56.9 50/60
EHK-15E 11.3/15 2 54.2/62.5 75.6/82.9 80/90
EHK-20E 15/20 2 72.2/83.3 95.1/108.9 100/110
Electric Heat Option
Max Fuse2/
Breaker3 Size
(Amps)
Compressors (each)
18.7A
0.95A
2.84A
060L
(5.0) 208/230-1-60 21.5A
Volt
Size
(Tons)
MCA1 (Amps)
036L
(3.0)
208/230-1-60
14.0A
70A
024T
(2.0)
208/230-1-60
9.7A
34.8A
15.1A
0.61A
1.71A
048L
(4.0)
208/230-1-60
19.0A
100A
29.6A
1.68A
3.66A
125A 33.5A 1.68A 3.82A

13
Table 6-3: 13 SEER Physical Data
MRC-24CWN1-M13L
Nominal Tonnage 2.0 2.0 3.0 3.0 4.0 4.0
ARI COOLING PERFORMANCE
Gross Capacity @ ARI A point (Btu)
23,935 23,735 35,963 35,563 48,813 48,313
ARI net capacity (Btu) 23,000 22,800 34,800 34,000 47,000 46,500
EER 10.85 10.85 10.40 10.10 10.90 10.80
SEER 13 13 13 13 13 13
Nominal CFM 730 730 1220 1220 1600 1600
System power (kW) 2.0 2.0 3.2 3.2 4.22 4.22
Refrigerant
type R410A R410A R410A R410A R410A R410A
Refrigerant charge (lb-oz) 3-15 3-15 4-14 5-12 8-3 8-6
ARI HEATING PERFORMANCE
47
O
F Capacity rating (Btu) — 22,000 — 34,800 — 47,500
System power (kW) — 1.85 — 2.80 — 3.95
17
O
F Capacity rating (Btu) — 11,200 — 19,000 — 26,500
System power (kW) — 1.60 — 2.50 — 3.40
HSPF (BTU/Watts-hr.) — 7.7 — 7.7 — 7.7
DIMENSIONS (Inches)
Length 51-25/64 51-25/64 51-25/64 51-25/64 57-61/64 57-61/64 57-61/64 57-61/64
Width 37-23/32 37-23/32 37-23/32 37-23/32 42 42
Height 24-13/16 24-13/16 24-13/16 24-13/16 33-3/64 33-3/64 33-3/64 33-3/64
OPERATING WT. (lbs) 304 309 335 340 445 454
COMPRESSORS
Type Rotary
Quantity 1 1 1 1 1 1
CONDENSER COIL DATA
Face area (Sq. Ft) 10.17 10.17 10.17 10.17 15.77 15.77
Rows 1.5
1.5
2222
Fins per inch 20 20 20 20 20 20
Tube diameter(inch) 9/32 9/32 9/32 9/32 9/32 9/32
Circuitry type interlaced interlaced interlaced interlaced interlaced interlaced
EVAPORATOR COIL DATA
Face area (Sq. Ft) 3.36 3.36 3.36 3.36 6.43 6.43
Rows 3 3 4 4 3 3
Fins per inch 17 17 17 17 17 17
Tube diameter(inch) 9/32 9/32 9/32 9/32 9/32 9/32
Circuitry type interlaced interlaced interlaced interlaced interlaced interlaced
Refrigerant control Orifice Orifice Orifice Orifice Orifice Orifice
CONDENSER FAN DATA
Fan diameter (inch) 22-3/64 22-3/64 22-3/64 22-3/64 23-5/8 23-5/8
Type Prop Prop Prop Prop Prop Prop
Drive type Direct Direct Direct Direct Direct Direct
No.
speeds 1 1 1 1 1 1
Number of motors 1 1 1 1 1 1
Motor HP each 1/12 1/12 1/6 1/6 1/3 1/3
RPM 1075 1075 825 825 1075 1075
Nominal total CFM 1960 1960 2565 2565 3960 3960
DIRECT DRIVE EVAP FAN DATA
Quantity 1 1 1 1 1 1
Fan Size (Inch) 9×9 9×9 9×9 9×9 10×10 10×10
Type Centrifugal Centrifugal Centrifugal Centrifugal Centrifugal Centrifugal
No. speeds 3 3 3 3 3 3
Motor HP each 1/4 1/4 3/4 3/4 3/4 3/4
RPM 1075 1075 1075 1075 1075 1075
Motor frame size 48 48 48 48 48 48
FILTERS
(No.) Size Recommended in. (1) 22×14×1 (1) 22×14×1 (1) 22×14×1 (1) 22×14×1 (1) 22×14×1 (1) 22×14×1
Models
Component
5.0 5.0
58,075 58,075
56,000 56,000
10.55 10.40
13 13
2000 2000
5.27 5.27
R410A R410A
8-13 9-1
— 57,500
— 4.65
— 31,000
— 4.05
— 7.7
42 42
463 472
Scroll 1-spdScroll 1-spdScroll 1-spdScroll 1-spdScroll 1-spd Scroll 1-spd
11
15.77 15.77
2.5 2.5
20 20
9/32 9/32
interlaced interlaced
6.43 6.43
44
17 17
9/32 9/32
interlaced interlaced
Orifice Orifice
23-5/8 23-5/8
Prop Prop
Direct Direct
11
11
1/3 1/3
1075 1075
3960 3960
11
10×10 10×10
Centrifugal Centrifugal
33
11
1075 1075
48 48
(1) 22×14×1 (1) 22×14×1
MRC-36CWN1-M13L MRC-48CWN1-M13L
MRC-60CWN1-M13L
Rotary
MRC-24HWN1-M13L
MRC-36HWN1-M13L
MRC-48HWN1-M13L
MRC-60HWN1-M13L

14
7.0 AIRFLOW PERFORMANCE
Airflow performance data is based on cooling performance with a coil and no filter in place. Use this perfor-
mance table for appropriate unit size, external static applied to unit and allow operation within the minimum
and maximum limits shown in table below for both cooling and electric heat operation.
7.1 AIRFLOW PERFORMANCE DATA
Table 7-1 Duct Application(208v)
0[0] 0.1[.02] 0.2[.05] 0.3[.07] 0.4[.10] 0.5[.12] 0.6[.15] 0.7[.17]
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
Motor
Speed
Model
Number
48
Low
Middle
High
24
Low
Middle
High
External Static Pressure-Inches W.C.[kPa]
CFM(L/S)(Watts)
60
Low
Middle
High
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
36
Low
Middle
High
889(419)
1170(525) 1143(539) 1110(524) 1070(505) 1021(428)
694 752 806 859 902
390 376 360 343 326
1.88 1.81 1.73 1.66 1.58
1251(590) 1206(569) 1148(541) 1080(509) 989(466)
869 910 949 983 1017
436 416 392 368 340
2.11 2.01 1.91 1.8 1.68
1345(634) 1272(600) 1192(562) 1107(522) 980(462)
965 995 1022 1045 1070
499 470 441 413 377
2.43 2.31 2.18 2.07 1.91
460 553 638 710
161 159 156 152
0.78 0.77 0.75 0.73
776 831 884
930
228 220 213
203
1.1 1.06 1.03
0.99
929 970 1004
280 266 253
1.37 1.32 1.26
756(357) 706 (333) 654 (309) 600(283)
842(397) 782(369) 718(339) 625(295)
805(380) 693(327)
1497(706) 1449(683) 1401(661) 1349(636) 1291(609)
676 722 773 816 853
457 448 437 426 413
2.26 2.22 2.18 2.14 2.08
1571(741) 1511(713) 1445(681) 1370(646) 1249(589)
834 872 905 936 972
527 510 493 473 443
2.65 2.59 2.53 2.46 2.35
1685(795) 1610(759) 1527(720) 1428(673) 1192(562)
927 954 980 1003 1041
626 604 580 556 510
3.22 3.15 3.07 2.98 2.83
1865(879) 1822(859) 1770(835) 1712(808) 1643(775)
851 886 919 948 974
641 620 598 578 555
3.08 2.98 2.88 2.79 2.69
1875(884) 1808(853) 1729(816) 1642(774) 1542(727)
961 984 1005 1024
1043
664 639 613 587 558
3.21 3.11 3.0 2.89 2.78
1905(898) 1826(861) 1736(819) 1615(762) 1479(698)
1017 1034 1049 1063 1079
703 677 648 619 585
3.44 3.34 3.22 3.1 2.97

15
* The above airflow data for reference only.
●The air distribution system has the greatest effect on airflow. The duct system is totally controlled by the contractor. For this
reason, the contractor should use only industry-recognized procedures.
●Heat pump systems require a specified airflow. Each ton of cooling requires between 350 and 450 cubic feets of air per minute
(CFM), or 400 CFM nominally.
●Duct design and construction should be carefully done. System performance can be lowered dramatically through bad
planning or workmanship.
●Air supply diffusers must be selected and located carefully. They must be sized and positoined to deliver treated air along the
perimerter of the space. If they are too small for their intended airflow, they become noisy. If they are not located properly, they
cause drafts. Reture air grilles must be properly sized to carry air back to the blower. If they are too small, they also cause
noise.
●The installers should balance the air distribution system to ensure proper quiet airflow to all rooms in the home. This ensures a
comfortable living space.
●An air velocity meter or airflow hood can give a reading of system CFM.
●When installation, installer should select the air speed according to the actual setting static pressure. Please refer to the Table
7-1 AIRFLOW PERFORMANCE DATA.
* In any stituation , the airflow of the unit should be in the range of 80% to 130% of 400CFM/Ton.
Table 7-2 Duct Application(230v)
0[0] 0.1[.02] 0.2[.05] 0.3[.07] 0.4[.10] 0.5[.12] 0.6[.15] 0.7[.17]
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
Motor
Speed
Model
Number
48
Low
Middle
High
24
Low
Middle
High
External Static Pressure-Inches W.C.[kPa]
CFM(L/S)(Watts)
60
Low
Middle
High
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
CFM(L/S)
RPM
Watts
Amps
36
Low
Middle
High
974(459)
1312(619) 1280(604) 1243(586) 1197(565) 1143(539)
770 817 863 902 943
455 442 423 402 380
1.98 1.92 1.85 1.76 1.67
1376(649) 1323(624) 1257(593) 1176(554) 1082(510)
919 951 983 1011 1039
494 470 444 418 388
2.17 2.07 1.97 1.87 1.75
1451(684) 1372(647) 1279(603) 1178(556) 1041(491)
1005 1028 1050 1069 1089
563 533 502 469 434
2.5 2.38 2.26 2.14 2.0
509 591 671 737
195 191 187 183
0.85 0.83 0.81 0.79
812 866 911
949
271 261 251
240
1.18 1.14 1.1
1.06
960 993 1023
328 314 299
1.47 1.41 1.36
847(399) 800 (378) 754 (356) 701(331)
932(440) 878(414) 806(380) 725(342)
889(419) 794(375)
1676(790) 1623(766) 1568(740) 1510(712) 1443(681)
751 793 833 870 903
536 522 508 493 468
2.42 2.37 2.32 2.27 2.21
1721(812) 1669(787) 1593(751) 1516(715) 1429(674)
891 922 948 973 997
608 591 670 550 529
2.82 2.76 2.69 2.62 2.55
1822(859) 1742(822) 1661(784) 1566(739) 1455(686)
966 988 1007 1025 1046
725 701 675 650 623
3.44 3.36 3.27 3.20 3.12
2037(961) 1984(936) 1936(913) 1859(877) 1780(840)
932 957 980 1001 1020
721 700 676 651 625
3.15 3.06 2.96 2.87 2.77
1998(943) 1931(911) 1855(875) 1757(829) 1654(780)
1010 1027 1043 1056
1071
729 706 677 651 623
3.24 3.14 3.04 2.94 2.83
2006(946) 1916(904) 1817(857) 1710(807) 1582(746)
1053 1065 1076 1086 1097
778 753 724 694 661
3.5 3.4 3.3 3.19 3.07

16
Table 7-3 Refrigerant charge for A/C system
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Table 7-4 Refrigerant charge for H/P system
Table 7-5 Refrigerant charge for H/P system
60 62 64 66 68 70 72 74 76 78 80 82
135
128
121
114
107
100
93
86
79
72
65
58
51
44
37
30
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRC-24HWN1-M13T
Heating Charge Chart/Tableau De Charge de Chauffage
Heating Mode
Indoor Dry Bulb Temperature(oF)/Temperature Interieur au Themometre sec(en oF)
MRC-24CWN1-M13T
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(oF)/Temperature Amdiante Exterieure(en oF)
Mode
De Chauffage
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
MRC-24HWN1-M13T
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(oF)/Temperature Amdiante Exterieure(en oF)
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
284 304 325 345 365 385 405 430 455 480 505
282 302 323 343 363 383 403 428 453 478 503
280 300 321 341 361 381 401 426 451 476 501
258 278 298 319 339 359 379 399 424 449 474 499
256 276 296 317 337 357 377 397 422 447 472 497
253 274 295 316 337 355 372 390 416 443 469 495
230 251 272 293 314 335 353 370 388 414 441 467 493
228 249 270 291 312 333 351 368 386 412 439 465 491
226 247 268 289 310 331 349 366 384 410 437 463 489
224 245 266 287 308 329 347 364 382 408 435 461 487
222 243 264 285 306 327 345 362 380 406 433 459 485
220 241 262 283 304 325 343 360 378 404 431 457 483
218 239 260 281 302 323 341 358 376 402 429 455 481
216 237 258 279 300 321 339 356 374 400 427 453 479
214 235 256 277 298 319 337 354 372 398 425 451 477
212 233 254 275 296 317 335 352 370 396 423 449 475
284 305 326 347 367 386 406 431 456 480 505
282 303 324 345 365 384 404 429 454 478 503
280 301 322 343 363 382 402 427 452 476 501
257 278 299 320 341 361 380 400 425 450 474 499
255 276 297 318 339 359 378 398 423 448 472 497
253 274 295 316 337 356 376 395 420 445 470 495
230 251 272 293 314 335 354 374 393 418 443 468 493
228 249 270 291 312 333 352 372 391 416 441 466 491
226 247 268 289 310 331 350 370 389 414 439 464 489
224 245 266 287 308 329 348 368 387 412 437 462 487
222 243 264 285 306 327 346 366 385 410 435 460 485
220 241 262 283 304 325 344 364 383 408 433 458 483
218 239 260 281 302 323 342 362 381 406 431 456 481
216 237 258 279 300 321 340 360 379 404 429 454 479
214 235 256 277 298 319 338 358 377 402 427 452 477
209 230 252 274 295 317 336 356 375 400 425 450 475
341 349 356 361 368 375 383 389 393 398 404 409
330 342 350 356 362 369 375 381 387 391 396 401
316 324 343 349 354 362 367 374 380 385 392 396
305 312 325 339 347 356 361 368 373 378 383 388
297 301 312 327 340 349 354 361 367 372 377 383
283 289 301 316 333 342 348 354 359 363 370 375
274 281 290 301 322 331 339 345 352 358 363 369
261 276 284 290 307 320 325 336 341 350 356 361
256 272 281 290 302 311 317 326 331 340 347 352
241 251 262 272 280 294 310 317 323 331 340 346
231 240 250 262 271 283 296 308 312 320 329 339
261 270 277 298 309 313 318 325
262 271 278 297 302 308 316
262 268 277 289 294 308
259 263 274 288 296

17
Table 7-6 Refrigerant charge for A/C system
Table 7-7 Refrigerant charge for H/P system
Table 7-8 Refrigerant charge for H/P system
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRC-36CWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRC-36HWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
60 62 64 66 68 70 72 74 76 78 80 82
135
128
121
114
107
100
93
86
79
72
65
58
51
44
37
30
Mode
De Chauffage
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRC-36HWN1-M13L
Heating Charge Chart/Tableau De Charge de Chauffage
Heating Mode
Indoor Dry Bulb Temperature(
o
F)/Temperature Interieur au Themometre sec(en
o
F)
289 308 328 347 372 398 423 454 485 516 547
287 306 326 345 370 396 421 452 483 514 545
285 304 324 343 368 394 419 450 481 512 543
264 283 302 322 341 366 392 417 448 479 510 541
262 281 300 320 339 364 390 415 446 477 508 539
260 279 298 318 337 362 388 413 444 475 506 537
238 258 277 296 316 335 360 386 411 442 473 504 535
236 256 275 294 314 333 358 384 409 440 471 502 533
234 254 273 292 312 331 356 382 407 438 469 500 531
232 252 271 290 310 329 354 380 405 436 467 498 529
230 250 269 288 308 327 352 378 403 434 465 496 527
228 248 267 286 306 325 350 376 401 432 463 494 525
226 246 265 284 304 323 348 374 399 430 461 492 523
224 244 263 282 302 321 346 372 397 428 459 490 521
222 242 261 280 300 319 344 370 395 426 457 488 519
220 240 259 278 298 317 342 368 393 424 455 486 517
298 322 345 369 388 408 427 458 488 519 549
296 320 343 367 386 406 425 456 486 517 547
294 318 341 365 384 404 423 454 484 515 545
268 292 316 339 363 382 402 421 452 482 513 543
266 290 314 337 361 380 400 419 450 480 511 541
264 288 312 335 359 378 397 416 447 478 508 539
239 263 286 309 333 356 375 395 414 445 476 506 537
237 261 284 307 331 354 373 393 412 443 474 504 535
235 259 282 305 329 352 371 391 410 441 472 502 533
233 257 280 303 327 350 369 389 408 439 470 500 531
231 255 278 301 325 348 367 387 406 437 468 498 529
229 253 276 299 323 346 365 385 404 435 466 496 527
227 251 274 297 321 344 363 383 402 433 464 494 525
224 247 271 295 318 342 361 381 400 431 462 492 523
222 245 269 293 316 340 359 379 398 429 460 490 521
220 243 267 291 314 338 357 377 396 427 458 488 519
328 341 350 358 364 367 372 378 383 387 393 401
322 331 342 350 357 360 365 371 376 381 386 392
313 320 333 341 346 352 360 365 371 376 379 386
305 314 325 332 340 347 353 359 366 372 377 380
296 306 314 323 330 340 346 352 358 365 372 376
288 294 303 311 319 332 339 345 351 358 364 368
280 285 296 303 311 323 330 337 345 352 357 361
271 278 284 292 303 312 321 328 335 344 353 356
263 267 271 280 291 302 311 319 324 336 341 347
251 256 260 268 279 291 303 310 315 318 329 338
241 245 249 254 261 277 285 292 304 309 318 326
252 265 276 282 296 302 311 318
254 262 268 284 289 301 310
255 260 269 273 288 295
254 261 265 275 282

18
Table 7-9 Refrigerant charge for A/C system
Table 7-11 Refrigerant charge for H/P system
Table 7-10 Refrigerant charge for H/P system
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-48CWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-48HWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
60 62 64 66 68 70 72 74 76 78 80 82
135
128
121
114
107
100
93
86
79
72
65
58
51
44
37
30
Mode
De Chauffage
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-48HWN1-M13L
Heating Charge Chart/Tableau De Charge de Chauffage
Heating Mode
Indoor Dry Bulb Temperature(
o
F)/Temperature Interieur au Themometre sec(en
o
F)
284 307 329 352 372 392 412 439 467 494 521
282 305 327 350 370 390 410 437 464 491 518
280 303 325 348 368 388 408 435 462 489 516
255 278 301 323 346 366 386 406 433 460 487 514
253 276 299 321 344 364 384 404 431 458 485 512
251 274 297 319 342 362 382 402 429 456 483 510
227 249 272 295 317 340 358 376 394 423 451 480 508
225 247 270 293 315 338 358 378 398 425 452 479 506
223 245 268 291 313 336 356 376 396 423 450 477 504
221 243 266 289 311 334 354 374 394 421 448 475 502
219 241 264 287 309 332 352 372 392 419 446 473 500
217 239 262 285 307 330 350 370 390 417 444 471 498
215 237 260 283 305 328 348 368 388 415 442 469 496
211 234 257 280 303 326 346 366 386 413 440 467 494
209 232 255 278 301 324 344 364 384 411 438 465 492
207 230 253 276 299 322 342 362 382 409 436 463 490
282 305 329 352 372 392 412 437 461 486 510
280 303 327 350 370 390 410 435 459 484 508
278 301 325 348 368 388 408 433 457 482 506
253 276 299 323 346 366 386 406 431 455 480 504
251 274 297 321 344 364 384 404 429 453 478 502
249 272 295 319 342 362 382 402 427 451 476 500
223 247 270 293 317 340 358 376 394 420 446 472 498
221 245 268 291 315 338 357 377 396 421 446 471 496
219 243 266 289 313 336 355 375 394 419 444 469 494
219 241 264 287 309 332 352 372 392 417 442 467 492
217 239 262 285 307 330 350 370 390 415 440 465 490
215 237 260 283 305 328 348 368 388 413 438 463 488
213 235 258 281 303 326 346 366 386 411 436 461 486
211 233 256 279 301 324 344 364 384 409 434 459 484
209 231 254 277 299 322 342 362 382 407 432 457 482
207 229 252 275 297 320 340 360 380 405 430 455 480
333 340 348 353 361 368 375 381 388 394 400 408
324 332 339 347 353 360 367 372 379 385 393 401
313 323 329 336 348 353 359 366 371 378 384 395
306 314 322 330 338 347 352 359 363 370 377 386
295 305 313 321 331 339 345 353 358 364 371 378
286 294 304 312 323 332 338 345 351 357 363 370
277 285 293 302 315 325 329 337 344 350 358 362
267 276 285 291 304 312 319 328 338 342 349 356
258 265 271 281 295 303 308 316 323 333 341 347
243 253 260 270 283 294 301 309 317 325 332 340
231 241 247 255 269 281 288 295 310 317 326 333
254 268 275 282 297 308 317 325
255 263 273 283 299 308 316
255 264 274 289 297 307
254 265 276 288 298

19
Table 7-12 Refrigerant charge for A/C system
Table 7-14 Refrigerant charge for H/P system
Table 7-13 Refrigerant charge for H/P system
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-60CWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
55 60 65 70 75 80 85 90 95 100 105 110 115
165
161
157
153
149
145
141
137
133
129
125
121
117
113
109
105
Mode
De Refroidissement
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-60HWN1-M13L
Cooling Charge Chart/Tableau De Charge de Refroidissement
Cooling Mode
Outdoor Ambient Temperature(
o
F)/Temperature Amdiante Exterieure(en
o
F)
60 62 64 66 68 70 72 74 76 78 80 82
135
128
121
114
107
100
93
86
79
72
65
58
51
44
37
30
Mode
De Chauffage
High Pressure Detected Valve(psig)/Vanne Détecté de Pression Haute(en psig)
Low Pressure Detected Valve(psig)
Vanne Détectée de Pression Basse(en psig)
MRB-60HWN1-M13L
Heating Charge Chart/Tableau De Charge de Chauffage
Heating Mode
Indoor Dry Bulb Temperature(
o
F)/Temperature Interieur au Themometre sec(en
o
F)
290 311 333 354 375 396 417 450 482 515 547
288 309 331 352 373 394 415 448 480 513 545
286 307 329 350 371 392 413 446 478 511 543
263 284 305 327 348 369 390 411 444 476 509 541
261 282 303 325 346 367 388 409 442 474 507 539
259 280 301 323 344 365 386 407 440 472 505 537
235 257 278 299 321 342 363 384 405 438 470 503 535
233 254 276 298 319 341 360 379 398 432 466 499 533
231 252 274 296 317 339 358 377 396 430 464 497 531
229 251 272 294 315 337 356 375 394 428 462 495 529
227 249 270 292 313 335 354 373 392 426 460 493 527
225 247 268 290 311 333 352 371 390 424 458 491 525
223 245 266 288 309 331 350 369 388 422 456 489 523
221 243 264 286 307 329 348 367 386 420 454 487 521
219 241 262 284 305 327 346 365 384 418 452 485 519
217 239 260 282 303 325 344 363 382 416 450 483 517
290 311 333 354 377 400 423 450 478 505 532
288 309 331 352 375 398 421 448 476 503 530
286 307 329 350 373 396 419 446 474 501 528
263 284 305 327 348 371 394 417 444 472 499 526
261 282 303 325 346 369 392 415 442 470 497 524
259 280 301 323 344 367 390 413 440 468 495 522
235 257 278 299 321 342 365 388 411 438 466 493 520
228 252 276 300 324 348 368 389 409 436 464 491 518
231 252 274 296 317 339 362 384 407 434 462 489 516
229 251 272 294 315 337 359 382 405 432 460 487 514
227 249 270 292 313 335 357 380 403 430 458 485 512
225 247 268 290 311 333 355 378 401 428 456 483 510
223 245 266 288 309 331 353 376 399 426 454 481 508
223 244 265 286 307 329 351 374 397 424 452 479 506
221 242 263 284 305 327 349 372 395 422 450 477 504
219 240 261 282 303 325 347 370 393 420 448 475 502
333 338 345 354 361 369 375 382 390 397 408 415
321 327 337 346 353 360 368 374 383 391 396 407
312 320 328 338 345 352 361 367 375 384 390 398
301 311 319 329 337 345 353 360 366 375 383 390
289 299 310 318 326 334 346 352 359 366 375 382
276 288 298 309 317 325 335 344 351 358 367 374
266 275 287 297 308 314 326 333 343 350 359 366
257 267 276 289 298 305 315 325 332 342 351 358
249 256 268 277 287 294 306 313 324 333 343 351
240 247 254 269 276 286 295 307 311 325 332 342
256 267 278 287 296 305 314 324 331
258 270 278 286 293 303 315 322
260 267 275 284 295 304 314
261 266 269 285 297 305
258 263 272 280 299

20
8.0 SYSTEM OPERATION
Refrigerant migration during the off cycle can result in a noisy start up. Add
a crankcase heater to minimize refrigeration migration, and to help eliminate
any start up noise or bearing “wash out”.
All heaters are located on the lower half of the compressor shell. Its purpose
is to drive refrigerant from the compressor shell during long off cycles, thus
preventing damage to the compressor during start-up.
At initial start-up or after extended shutdown periods, make sure the heater
is energized for at least 12 hours before the compressor is started.
(Disconnect switch on and wall thermostat off.)
The crankcase heater start-up conditions:
If the outdoor ambient temp. is ＜37.4°F and the compressor stopped for
more than three hours or the unit powered on once more, the crank heater
will be on.
Crankcase heater shut-down conditions:
If the outdoor ambient temp. is ＞44.6°F or the compressor start running ,the
crank heater will be off.
8.2 Protection
8.1 COMPRESSOR CRANKCASE HEATER(OPTIONAL)
Discharge temperature protection :
When discharge temp. is ＞275°F, the compressor will be off,
When discharge temp. is ＜194°F, the compressor will start running.
8.2.1 Protection for AC system
8.2.2 Protection for HP system
When the sensor(T3&T4) was checked open-circuit or short-circuit, the
compressor ,outdoor fan motor and 4-way valve will be off.
Discharge temperature protection:
When discharge temp. is > 275°F, the compressor will be off, When discharge
temp. is < 194°F, the compressor will start running.