ICE AIR ccHPWH Series Manual

Installation and
Maintenance Manual HPWH
ccHPWH Series
Cold Climate Heat Pump
Water Heaters
for domestic hot water applications

Content
I. Foreword.................................................................................................................................................. 1
II. Working principle................................................................................................................................... 7
III. Product specification............................................................................................................................ 8
1. Dimensions............................................................................................................................................... 8
2. Technical parameter .............................................................................................................................. 10
IV. Installation........................................................................................................................................... 12
1. Product handling .................................................................................................................................... 12
2. Installation site selection........................................................................................................................ 12
3. Installation foundation............................................................................................................................ 13
4. Hydronic piping layout............................................................................................................................ 14
4.1. Pipe size....................................................................................................................................... 14
4.2. Water tank selection..................................................................................................................... 14
4.3. Installation requirements.............................................................................................................. 15
4.4. Water quality requirements.......................................................................................................... 15
5. Water system piping for atmospheric (open) tank................................................................................. 16
6. Winter freeze protection......................................................................................................................... 16
V. Unit operation....................................................................................................................................... 17
VI. Electrical wiring diagram................................................................................................................... 21
1. Notice ..................................................................................................................................................... 21
2. Wiring diagram....................................................................................................................................... 23
VII. Control function................................................................................................................................. 25
1. Controller panel...................................................................................................................................... 25
2. Interface overview.................................................................................................................................. 25
3. Interface introduction.............................................................................................................................. 27
3.1. Overview....................................................................................................................................... 27
3.2. Countdown interface.................................................................................................................... 27

3.3. Main interface............................................................................................................................... 28
3.4. Fault inquiry.................................................................................................................................. 28
3.5. Timing set..................................................................................................................................... 29
3.6. Status inquiry................................................................................................................................ 30
3.7. Version inquiry.............................................................................................................................. 31
3.8. Historical fault Inquiry................................................................................................................... 31
4. Password operation ............................................................................................................................... 32
4.1. Password input............................................................................................................................. 32
4.2. Password change......................................................................................................................... 33
5. Parameter setting................................................................................................................................... 33
5.1. Parameter level............................................................................................................................ 33
5.2. Parameter setting......................................................................................................................... 34
6. Atmospheric Tank Control.................................................................................................................... 37
7. Control instructions of the lower return pump........................................................................................ 37
8. Module control and linkage wiring.......................................................................................................... 38
VIII. Trial running and maintenance....................................................................................................... 41
1. Trial running ........................................................................................................................................... 41
2. Trouble shooting..................................................................................................................................... 42
2.1. Control protection function list...................................................................................................... 42
2.2. Fault analysis and elimination of electric control panel display................................................... 42
2.3. Trouble shooting........................................................................................................................... 43
3. Maintenance........................................................................................................................................... 45

1
I. Foreword
Please read this instruction carefully before installation and use. This instruction includes required messages
for installation, adjustments, and maintenance.
Ice Air heat pump products are produced to strict design standards to ensure safe, efficient, and reliable
operation.
Ice Air is not responsible for damage to people or property caused by improper installation, adjustment,
maintenance, or operations contrary to this instruction manual.
The DANGER sign indicates potential harm that could result in personal injury or death.
The WARNING sign indicates potential harm that could result in personal injury or death.
The CAUTION sign indicates dangers that can cause damages to unit, other devices, or air
pollution.
The NOTE sign indicates important items to take note of. The NOTE indicates items that may
affect the operation of the units.
Apart from factory provided options, additional external wires are not allowed to be connected to the power or
control wiring cabinets. Third party relays, switches, sensors, and controllers are not allowed to be installed in
the power or control wiring cabinets. External wiring cannot cross over the power or control wiring cabinets. All
the wiring work must follow specifications and be installed by professionals.
Lethal high voltage DC and AC is present in the power wiring control cabinet. Make sure the
power supply is off before opening the cabinet.

2
To avoid injury or damages to the units, please observe these notes:
•The supply power wiring must be selected according to the maximum overcurrent protection (MOCP) or
maximum power.
•Power must be ground in accordance with the National Electrical Code.
•Confirm the fastening of power wiring prior to start-up
•Connect the supply wiring in accordance with the wiring diagram.
•Installation professionals are advised to wear protective gear, such as anti-static gloves during electrical
operations, etc.
•Check the parts, integrity, and insulation of wiring, and repair if needed.
•This unit is intended to operate within the ranges specified.
•It is strictly prohibited to refit the unit or modify the parameters.
Water system installation
•Isolation valves and drains shall be installed at the inlet and outlet of the water pipes; strainers are
recommended on the inlet piping.
•Gauges and thermometers are recommended to be installed on the inlet and outlet pipes to monitor the
operation of the system and equipment.
•The temperature difference of water inlet and outlet are suitable between 7°F (4℃) and 11°F (6℃) when
operating at full load.
•The water quality should meet the requirement below：
pH value（25℃）
6.5 − 8.0
Chloridion（Cl（mg/L）
＜50
Electrical conductivity
（25℃）(μs/cm)
＜250
Silver sulfate（SO
42
−
）（mg/）
＜50
TFe（mg/L）
＜0.3
Total alkalinity
＜50
Total hardness（mg/L）
＜50
Silicon dioxide（SiO2）
＜30
Compressor shipping brackets are mounted to the bottom of the compressors to prevent the
vibration isolation mounts from damage during shipment. REMOVE the compressor shipping
brackets prior to start-up.
Warning
•Prior to start-up, the compressor should be powered on to preheat the system. Recommended preheat
cycle is 8 hours prior to initial start-up. Completing the recommended preheat improves the temperature of
the compressor lubricating oil. Failing to properly preheat the system can result in poor operation or damage
to the compressor.
•CFC’s can destroy the ozone layer in the atmosphere and pollute the environment. Utilize recovery devices
to recover refrigerant when servicing the system.
•If the operation of this system has the potential for power loss and has the potential to experience ambient
temperatures below freezing [32°F (0°C)], then the user should utilize one of three strategies: A) Order the
unit with factory mounted heat trace, then provide field heat trace on external piping and an emergency
power source for the heat trace, or B) Utilize glycol (anti-freeze) solution within all external hydronic piping.

3
C) Drain the water from the system prior to any ambient temperature dropping below freezing [32°F (0°C)].
•Ensure supply wiring is free of defects and properly protected.
•It is prohibited to disconnect or short circuit any safety devices.
•Ensure three-phase power is connected properly to avoid reverse rotation or phase loss. Operation with
reverse phase will cause serious damage to the unit.
•Power wiring must be protected by a rubber gasket, otherwise water could damage electrical components
and result in risk of electric shock.
Detailed explanation of structure
ccHPWH series is composed of compressor, evaporator (hydrophilic finned heat exchanger), condenser
(brazed plate heat exchanger), throttling device (electronic expansion valve), liquid injection enthalpy increase
system, sheet metal parts of box structure, refrigerant system copper pipe, temperature sensors, pressure
switch, electronic control system and other main components. The explosion diagram of the product is as
follows:

4
1
Chassis component
10
Wire controller
19
Solenoid 2-way valve
2
Compressor
11
Transformer
20
Brazed plate heat exchanger
3
Crankshaft electric heater
12
Grounding device
21
40mm insulated cotton
4
Liquid-vapor separator
13
Inductor
22
Hydronic electric heater
5
4 way valve
14
Pressure gauge
23
Single disc ball valve
6
Electric box
15
Fan
24
Water outlet pipe
7
Mounting plate
16
Hydrophilic finned heat exchanger
25
Water inlet pipe
8
Motherboard
17
Chassis electric heater
26
Water flow switch
9
AC contactor
18
EEV component
27
Name
Specification
Detailed information
Water inlet temp.
sensor
A.S.W.01.N-10K-5X25-
06-ROHS
Ф5X25,copper shell,4000mm,With white color TV
connector,NTC,R25=10K±1%,B25/50=3950
±1%
Water outlet temp.
sensor
A.S.W.01.N-10K-5X25-
06-ROHS
Ф5X25,copper shell,4000mm,With white color TV
connector,NTC,R25=10K±1%,B25/50=3950
±1%
Ambient temp.
sensor
A.S.W.01.N-10K-5X25-
06-ROHS
Ф5X25,copper shell,4000mm,With white color TV
connector,NTC,R25=10K±1%,B25/50=3950
±1%
Coil temp. sensor
A.S.W.01.N-10K-5X25-
24-ROHS
Ф5X25,copper shell,4000mm,With blue color TV
connector,NTC,R25=10K±1%,B25/50=3950
±1%
Suction temp.
sensor
A.S.W.01.N-10K-5X25-
25-ROHS
Ф5X25,copper shell,4000mm,With green color TV
connector,NTC,R25=10K±1%,B25/50=3950
±1%,-30～+105℃
Exhaust temp.
sensor
BP-A.S.W.01.N-10K-
5X25-21-ROHS
Ф 5 x25, copper plating nickel shells, black PVC and lines,
line 4 m, with a red color TV connectors, NTC, diode
type,R25=10K±
1%,B25/50=3950±1%/high temperature resistance150℃
Water tank temp.
BP-A.S.W.01.N-10K-
5X25-21-ROHS
Ф 5 x25, copper plating nickel shells, black PVC and lines,
line 4 m, with a red color TV connectors, NTC, diode
type,R25=10K±
1%,B25/50=3950±1%/high temperature resistance150℃
Water level
common end
A.S.T.002-ROHS
RoHS,Electrode type water level sensor probe, stainless
steel, line length 10m,blue
Low water level
A.S.T.003-ROHS
RoHS,Electrode type water level sensor probe, stainless
steel, line length 10m,yellow
Middle water level
A.S.T.004-ROHS
RoHS,Electrode type water level sensor probe, stainless
steel, line length 10m,black
High water level
A.S.T.001-ROHS
RoHS,Electrode type water level sensor probe, stainless
steel, line length 10m,red

5
The HPWH refrigeration circuit shall contain scroll compressor(s) with a maximum of 15-hp per circuit, factory
charged with R-410A refrigerant, air-source evaporator(s), water-source condenser(s), EEV regulated flow, EEV
regulated vapor injection circuit, and 4-way valve to reverse the refrigeration circuit during defrost cycles.
The water-source condenser circuit shall be provided with one of two factory options:
A. Double wall, brazed plate heat exchanger with airgap and leakage ports. This option to be utilized with
direct heating of potable hot water. When this feature is selected, factory mounted heat-trace will be
provided on all internal hydronic components, wired to a unit mounted 115v/1ph/60hz terminal strip
intended for field provided emergency power source.
B. Single wall, brazed plate heat exchanger. This option to be utilized with indirect heating of potable hot
water. Typical applications include glycol circuits for exterior piping that transfer heat via an interior
mounted double wall heat exchanger that services the domestic hot water circuit. Heat-trace is not
provided with this option because glycol operation is assumed.
Supply and return piping shall be 316L stainless steel with flanged supply and return connections. Clean out
ports (1” NPT) shall be provided on the supply and return headers to allow for preventive maintenance of the
heat exchanger circuits. Pipes and heat exchangers to be insulated with 40mm rubber cotton insulation.
Operation guidelines for defrosting and drainage in winter
In winter, when the temperature is lower than 32°F (0℃), if the unit is powered off for any reason, then water
must be drained from the unit to prevent damage to the hydronic components. Draining the system of water
shall be carried out as follows:
Operational guideline：
Isolate the inlet and outlet water connections external to the unit. Ensure the internal isolation valves on each
heat exchanger are open. Open the drain cap at the bottom of inlet water pipe to drain water. Keep the drain
port open until the next use. Open the vent valve to facilitate complete draining of water from the heat
exchangers. Using compressed air or a wet/dry vacuum to assist water removal is recommended.

6
When flushing the piping system prior to start-up, ensure this heat pump is bypassed to prevent
pipe debris from entering the heat exchangers. Only after the piping has been cleaned, should
the heat pump be pressure tested.

7
II. Working principle
This heat pump water heater gathers heat from the environment (refrigerant-to-air HXR), compresses refrigerant
vapor to a higher temperature, then heats the working fluid (domestic water or glycol depending on the
application) in the condenser section (refrigerant-to-water HXR). The condensed high pressure and warm fluid
is rapidly expanded through the EEV to introduce cold liquid into the evaporator (ambient air side) to be boiled
off and complete the circuit. A reversing valve is utilized during the defrost cycle.
The condenser with double-wall plate heat exchanger has a protective air gap between the refrigerant and the
water circuit to prevent the refrigerant from entering the potable water side should a leak occur. In addition, it
greatly reduces the difficulty of maintenance. Each heat exchanger is equipped with water side isolations valves
and unions, as well as internal electrical disconnects. If a single system fails, the maintenance can be completed
without affecting the operation of refrigeration circuits in the system.
The electronic expansion valve is installed upstream of the evaporator and downstream of the condenser. It is
used to throttle the medium-temperature and high-pressure refrigerant to the low-temperature and low-pressure
gas-liquid mixture. The EEV is digitally controlled to accurately meter the refrigerant flow and control the phase
change.
The EVI systems (enthalpy vapor injection) utilizes an EEV to tightly control head pressure and discharge
temperature by bypassing the condenser coil and injecting cool vapor into the suction side of the compressor..

8
III. Product specification
1. Dimensions
Unit: inch
ccHPWH275-S, ccHPWH275-D

9
ccHPWH550-S, ccHPWH550-D

10
2. Technical parameter
Model
ccHPWH275-S
ccHPWH550-S
Performance
Specifications
Power Supply (V/Ph/Hz)
208-230V/3Ph/60Hz
208-230V/3Ph/60Hz
Refrigerant Circuits
2
4
Refrigerant
R410A
35.4-lbs (17.7-
lbs/circuit)
R410A
70.8-lbs (17.7-
lbs/circuit)
Max H/W Temperature
140°F
140°F
Dry Bulb Temperature (68°F);
Wet Bulb Temperature (59°F);
Inlet Water Temperature (59°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
341,263
563,003
Input Power(kW)
22.2
37
COP
4.41
4.42
Dry Bulb Temperature (45°F);
Wet Bulb Temperature (43°F);
Inlet Water Temperature (48°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
270,645
495,600
Input Power(kW)
18.6
39.2
COP
3.70
3.71
Dry Bulb Temperature (10°F);
Wet Bulb Temperature (7°F);
Inlet Water Temperature (43°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
175,396
304,500
Input Power(kW)
17.3
37.8
COP
2.57
2.36
Max. Input Power (kW)
29.8
62
FLA (A)
140
252
MCA (A)
154
266
MOCP (A)
210
322
Sound Level (dBA)
≤71
≤76
Water Data
Condenser Type
Brazed Plate HXR
(Single wall)
Brazed Plate HXR
(Single wall)
Water Side Pressure Loss (psig)
8.1
7.25
Rated Water Flow (gpm)
73.4
129.6
Piping Position
Right Hand
Right Hand
Piping Sizes
2" (Flange)
3" (Flange)
Minimum Ambient Operating Temperature (°F)
-13
-13
Overall Dimensions [L x W x H] (inches)
81 x 39 x 92
95 x 51 x 95
Net Weight (Lbs)
1,500
2,850
* The “-S” in the model number indicates single wall heat exchanger construction. The “-S” version is intended
for indirect DHW heating applications, glycol systems, etc. For direct potable water heating, use the “-D” version
which provides for double wall heat exchanger construction.
Due to Ice Air’s ongoing development programs, the information in this document is subject to change without
notice.

11
Model
ccHPWH275-D
ccHPWH550-D
Performance
Specifications
Power Supply (V/Ph/Hz)
208-230V/3Ph/60Hz
208-230V/3Ph/60Hz
Refrigerant Circuits
2
4
Refrigerant
R410A (30.8 Lbs /
15.4 Lbs per circuit)
R410A
70.8-lbs (17.7-
lbs/circuit)
Max H/W Temperature
140°F
140°F
Dry Bulb Temperature (68°F);
Wet Bulb Temperature (59°F);
Inlet Water Temperature (59°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
327,246
532,287
Input Power(kW)
22.7
37.3
COP
4.23
4.18
Dry Bulb Temperature (45°F);
Wet Bulb Temperature (43°F);
Inlet Water Temperature (48°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
262,360
470,820
Input Power(kW)
21.72
44.8
COP
3.54
3.48
Dry Bulb Temperature (10°F);
Wet Bulb Temperature (7°F);
Inlet Water Temperature (43°F);
Outlet Water Temperature (131°F).
Heating Capacity (Btu/h)
170,027
289,275
Input Power(kW)
20.28
43.2
COP
2.46
2.22
Max. Input Power (kW)
29.8
62
FLA (A)
140
252
MCA (A)
154
266
MOCP (A)
210
322
Sound Level (dBA)
≤71
≤76
Water Data
Condenser Type
Brazed Plate HXR
(Double wall)
Brazed Plate HXR
(Double wall)
Water Side Pressure Loss (psig)
16.51
13
Rated Water Flow (gpm)
58.9
122.5
Piping Position
Rear
Right Hand
Piping Sizes
2" (Flange)
3" (Flange)
Minimum Ambient Operating Temperature (°F)
-13
-13
Overall Dimensions [L x W x H] (inches)
81 x 39 x 92
95 x 51 x 95
Net Weight (Lbs)
1,555
2,950
* The “-D” in the model number indicates double wall heat exchanger construction. For direct potable water
heating, use the “-D” version. The “-S” version is single wall and intended for indirect DHW heating applications,
glycol systems, etc.
Due to Ice Air’s ongoing development programs, the information in this document is subject to change without
notice.

12
IV. Installation
1. Product handling
•Confirm the unit has sufficient space for safely rigging it into place.
•Remove the protective packaging just prior to installation.
•During handling, the inclination of the unit shall not be more than 15° to prevent the unit from overturning.
•When rolling transportation is used, the same size rollers shall be placed under the base of the unit. Each
roller must be a little longer than the outer frame of the base and suitable for the balance of the unit.
•When hoisting, the hoisting cable shall be rated for minimum of 3 times the weight of the unit. Check and
ensure that the lifting hook is fastened to the unit, and the hoisting angle is greater than 60°. Add cloth or
hard paper between the unit and the wire rope to prevent damage to the unit. Hoisting diagram is as follows:
2. Installation site selection
•The unit shall be installed in a location with ample space to allow for sufficient air flow and maintenance of
all components.
•If the unit is in a place accessible to unauthorized personnel, isolation safety measures should be taken,
such as setting up protective fence, etc.
•Select locations where the sound from the unit and cool air leaving the coils will not affect the surrounding
environment including nearby building occupants.
•The location shall facilitate the installation and maintenance of pipes and electrical connections.
•Ensure a sound foundation if mounted on grade and sufficient vibration isolation if roof mounted.

13
•Ensure sufficient drainage for rain and condensate discharge.
•Roof mounted units shall consider local codes regarding wind and seismic restraints, mounting heights
above the snow line, and ensure properly grounding protection to mitigate damage from lighting strikes.
Recommended unit spacing：
Air flow clearances:
Installation space（ft）
A
B
C
D
E
≥ 6.5-ft
≥ 6.5-ft
≥ 6.5-ft
≥ 6.5-ft
≥ 26.5-ft
3. Installation foundation
•Supporting platforms must be able to bear the operating weight of the equipment and all associated piping,
accessories, maintenance personal, and weather-related components such as snow, water, etc. The units
should be installed level. For the operating weight, please refer to the table of performance and specification
parameters.
•The units must be installed on a level surface (with an inclination level not to exceed 2-degrees). Vibration
isolation pads are recommended. Units should be fixed to surface with bolts. Condensate should drain away
from the unit.
If the unit is installed indoors, a means of mitigating static pressure build-up must be
implemented.

14
The installation base of concrete of the unit is as follows:
Unit: inches
Model
A
B
C
ccHPWH275-S
43.3
36.90
18.5
ccHPWH275-D
ccHPWH550-S
51.75
49.375
21.65
ccHPWH550-D
4. Hydronic piping layout
4.1.Pipe size
Please refer to the performance specification for inlet and outlet pipe diameters.
4.2.Water tank selection
Pressurized Tank Applications: A pressure relief valve should be installed on the water tank and selected to
relieve pressure at no more than 10% less than the rated working pressure of the water heater and all other
system components. If there is no pressure relief device installed on the water tank, the water system must be
equipped with a pressure relief value (PRV).
The PRV should be piped to a drain and open to atmosphere. To ensure proper operation of the PRV, it should
be checked on a regular basis to ensure it is free of sediment or calcium carbonate deposits.
The working pressure of the system should be set for a minimum of 30-psig.
Atmospheric Tank Applications: The unit is equipped with high, medium, and low water level, automatic water
replenishment control function, which allows for integration with an open (atmospheric) tank. When the unit is
applied to a pressurized tank, the output line of the high, medium, and low water level control will require a jumper
to complete the circuit. This jumper should be factory installed.

15
4.3.Installation requirements
A means of isolating the unit from the main system flow is required for service. A bypass value is recommended
to allow the system piping to be cleaned without introducing sediment into the heat pump heat exchangers.
Install a 40 mesh or finer filter near the inlet of the unit. Pressure gauge and temperature sensor on the inlet
and outlet pipes are recommended to allow for ease of monitoring operation.
The water flow must be properly balanced to ensure the water flow does not exceed the maximum flow rate.
When operating at full load, the temperature difference between inlet and outlet should be between 7°F and
11°F (4°C and 6°C).
External piping should be properly supported. The unit’s pipe connections should not carry the weight of the
piping.
All low points of the water system must be provided with drainage interfaces to facilitate the drainage of water
in the water system. All high points must be provided with vent valves to facilitate the evacuation of air in the
pipeline. Vent and drain ports should be left uninsulated for ease of maintenance.
The pipe should be thoroughly flushed and free of debris prior to start-up. Care must be taken
during installation to ensure no foreign debris enters the waterside or air-side heat
exchangers.
4.4.Water quality requirements
A. Water quality considerations
If the unit is applied to a closed (HVAC) loop then scale build up is unlikely; and single wall heat exchangers
are permissible. For units directly heating potable water, double wall heat exchangers are required, and the
quality of the supply water and means of filtration and softening the water will affect the amount of potential
scale and sediment build-up within the heat exchangers. Care should be taken to mitigate scale and sediment
building up. Scale and sediment build up will derate performance and can ultimately cause system failure.
NOTE: Clean out ports are located on the supply and return headers of the unit. Annual backflushing of the
heat exchanger assemblies with a potable water rated acid is recommended to dissolve any scale buildup and
flush away any sediments that may accumulate.
The water quality, such as pH value, conductivity, chloride ion concentration, sulfur ion concentration, etc.
should be analyzed before use. Water must be filtered and softened with water softening equipment before
entering the water heater’s heat exchangers.
B. Applicable water quality standards of unit

16
Ph value（25℃）
6.5 − 8.0
Chloridion（CL）（mg/L）
＜50
Conductivity（25℃）(μs/cm)
＜250
Silver sulfate（SO42 −）（mg/L）
＜50
Total iron（mg/L）
＜0.3
Total alkalinity
＜50
Total hardness（mg/L）
＜50
Silicon dioxide（SiO2）
＜30
5. Water system piping for atmospheric (open) tank
6. Winter freeze protection
The unit is equipped with a freeze protection program. If the unit has power and senses the water is
below 40°F, it will turn on and operate the system until the water is at 60°F. To protect the hydronic
components from freezing during a power outage, there are a few options.
Option 1: Order the unit with factory mounted heat-trace and connect the heat-trace circuit to the
building emergency power supply.
Option 2: Utilize a glycol loop for the outdoor hydronic components; and a secondary double wall
heat exchanger between the glycol loop and potable hot water located indoors.
Option 3: Drain the system during ambient conditions at or below 32°F (0℃). To properly drain the
system, follow the steps noted below:

17
Operational guideline：
To drain the system, first isolate the supply and return piping to the unit, then ensure the internal
isolation valves on each heat exchanger are open, next open the drain port at the bottom of inlet water
pipe to drain the water from the system. Opening the air vent on the return piping will speed up the
draining process.
The pipe should be thoroughly flushed and free of debris prior to start-up. Care must be taken
during installation to ensure no foreign debris enters the water-side or air-side heat exchangers.
V. Unit operation
After the unit is powered on, it enters the pre-heating state. In this state, the compressor crankshaft heating belt
is turned on. During the pre-heating process, the unit cannot be turned on, but the start-up command can be
set-up. After the pre-heating time is reached, it will automatically start according to the start-up command. In
the pre-heating state, you can cancel the preheating according to the prompt or wait for the preheating to
complete. Its purpose is to prevent cold start from damaging the compressor.
There are two means to turn the unit on/off:
1) The ON/OFF key on the keypad
2) Timer: Turn ON/OFF according to the set time
After confirming that there is no fault, the water pump will start running after 60s. The fan will start running 10s
after the water pump is turned on. When the compressor has energy demand, it turns on after the water pump
runs for 75s.
When the unit receives a shutdown command or the demand for adjustment, the four-way valve will switch 5
seconds before the compressor in advance, the compressor will stop immediately, the fan will be turned off after
10 seconds, and the pump will stop running after 3 minutes of continuous operation.