Chiltrix CX34 User manual

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DC INVERTER
AIR TO WATER HEAT PUMP
Installation and Operation Manual CX34
Options for Heating, Cooling and Domestic Hot Water
Version 1.6

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Table of Contents
Safety Precautions................................................................................................................... 3
CX34 components.................................................................................................................... 4
Hydronic piping and design guide ........................................................................................... 5
Heat Pump Installation.......................................................................................................... 14
Pump Installation .................................................................................................................. 15
Valves G1, G2, G3 ................................................................................................................. 24
Assistant Electric Heater ....................................................................................................... 30
System Filling ........................................................................................................................ 31
Air Purging ............................................................................................................................ 32
Wired Control Panel .............................................................................................................. 33
P-Parameter Setting ............................................................................................................. 47
C-Parameter Checking .......................................................................................................... 50
Initial Temperature Settings.................................................................................................. 53
Faults .................................................................................................................................... 54
Error Codes............................................................................................................................ 56
Commissioning and Initial Test Run ...................................................................................... 59

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Safety Precautions
NOTE: It is required to read the Safety precautions in detail before operation. The
precautions listed below are very important for safety, please follow all safety
precautions.
General
Make sure that the ground wire in the building is securely connected to earth.
Wiring tasks should be carried out by qualified electricians only, in addition, they should check
the safety conditions of power utilization, for example, verify that the line capacity is adequate,
and the power cable isn’t damaged.
Users must not install, repair or relocate the unit. Improper procedures might lead to accidents
e.g. personal injury caused by fire, electrical shock or unit's falling off its base, and water leaking
into the machine. Please contact a professional service department if problems arise.
The unit shall not be installed at a spot with the potential hazard of leaking flammable gas. If
gas is leaking near the machine, there might be the risk of explosion.
Make sure that the foundation of the unit is stable. If the foundation is unstable, the outdoor
unit may come loose from its base and cause injury.
Make sure that the GFCI installed at the service panel is working properly to avoid shock or
fires.
If any abnormity occurs in the unit (such as a burning smell is noticed inside the unit), cut off
the power supply immediately, and contact a professional service department.
Please observe the follow items when cleaning the unit. Before cleaning, shut off the electric
supply of the unit first to avoid injuries caused by the fan operation.
Do not rinse the unit with water because the rinsed unit may cause electric shock.
Make sure to shut off the electric supply before maintaining the unit.
Please do not insert fingers or sticks into air outlet or air inlet.
Transporting and storage
The machine must be transported and stored vertically.

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CX34 Components

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Hydronic Piping and Design Guide
Installation Methods Heating and Cooling (Heating Shown)
Note: Primary Secondary Piping is NOT supported on this chiller.
A buffer tank must be used for floor heating.

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1. Minimum pipe size should be no less than 1”, CPVC or Oxygen Barrier PEX, reverse return piping is
preferable to eliminate balancing valves or pressure regulators. The installer should calculate the
pipe and fitting resistance to determine the head pressure. See the examples on the following pages,
maximum water flow for the CX34 is 6 gpm, design flow is 4.8 gpm. If necessary, a second PWM
pump may be added to the loop and controlled by the CX34. The second water pump connections
are always in parallel with the internal pump.
2. The loop example above is designed with wild coils. Water flows through the coil at all times, if there
is a call for heating or cooling the FCU controls will turn the fan on.
3. An air discharge valve should be installed at the top of the circulation system if possible for easy air
discharge. As an alternative an automatic/manual air vent can be used inline before the pumps.
4. Always install a water filter or wye strainer on the supply pipe to the chiller to prevent blockage of
the heat exchanger.
Piping Examples: Stacked Chillers
Chillers piped in parallel

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A volume expander tank should be used when the loop volume is less than 5 gallons to keep the compressor
from cycling.
Using a Buffer Tank
Primary / secondary piping is not supported, when connecting to a floor heating loop always use a buffer
tank. Buffer tanks are generally used only with floor heating.
The pump in the buffer tank drawing is controlled by the customer’s floor loop controls. A 20-50 gallon
buffer tank is used generally for best performance. A G3 seasonal valve may be used to isolate the tank in
cooling mode.

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Head Calculation Example:
To calculate the head pressure for the correct water flow, the pipe length must be measured and all fittings
counted. It is advisable to use flexible red oxygen barrier PEX piping to avoid as many elbows as possible. All
fittings have an equivalent length of pipe already calculated, available on the next page under PEX Fittings
Pressure Drops. Add up the equivalent length of pipe for the fittings, 13.8’ + 11.7’ =25.5’. Then, add this to
the actual pipe, 25.5’+115” = 140.5’ of 1” pipe. Once you know the total length of pipe, use a (1” PEX 10%
Glycol, feet of head per 100 feet of tubing chart), to get the head for 1’ of pipe, at 40°F and 4.76 GPM. This
comes to (.0500) feet of head per foot. 140.5 x .0500=7.02 ft. of head. Add up all head calculations, 7.02 +
8.35 + 4.01 = 19.38 ft. of head. Next we will look at the Wilo Pump curve on page 13. Maximum head at 4.76
GPM is 23.67 ft.
If using the CX30SE (Free Cooling option) the CX30SE’s pressure drop is 4.5 PSI when active.

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Notes:
The example loop above has a volume of 4.5 gallons. The internal thermal expansion tank is 2 liters or .52
Gallons. The volume of the CX34 is 4.5 liters. An additional thermal expansion tank may be required for
larger loops. There are many thermal expansion calculators on the internet, the following is an example.
http://westank.com/calculator/
Minimum loop pressure is 14.5 psi, maximum pressure is 43.5 psi, and ideal pressure is 29 psi. The Lowest
temperature is 44°F, the highest temperature is 131°F, the Initial pressure is 14.5 psi, and the final pressure
is 29 psi.
A microbubble air separator should be installed in the loop preferably in the higher part of the loop to
remove any air in the circulation loop.
Always install a water filter or wye strainer on the supply pipe to the chiller to prevent blockage of the heat
exchanger.
PEX PIPE VOLUME
WYE STRAINER
PEX Fittings Pressure Drops

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Freeze protection

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NOTE:
When using CPVC piping it is highly recommended that you do not exceed a 25% glycol
to water ratio. Environmental Stress Cracking, also referred to as ESC, may occur.
Required flow per ton for various glycol % changes with the glycol %.
Cooling is generally OK as you will see but pay attention to heating. Note the “500”
formula is adjusted as follows:
Cooling is generally OK as you will see but pay attention to heating. Note using the
“500” formula 500 X GPM X ΔT = BTU, is adjusted as follows:
COOLING HEATING
0% glycol use 500 x 1.0 (500) 24,000/500/10=4.8 33,000/500/10=6.6 GPM
10% glycol use 500 x .98 (490) 24,000/490/10=4.89 GPM 33,000/490/10=6.73 GPM
20% glycol use 500 x .96 (480) 24,000/480/10=5.00 GPM 33,000/480/10=6.87 GPM
30% glycol use 500 x .935 (467) 24,000/467/10=5.14 GPM 33,000/467/10=7.06 GPM
40% glycol use 500 x .895 (447) 24,000/447/10=5.36 GPM 33,000/447/10=7.38 GPM
50% glycol use 500 x .85 (425) 24,000/425/10=5.64 GPM 33,000/425/10=7.76 GPM
Example:
Flow needed per ton cooling:
2 tons: 0% glycol 2.4 GPM/ton (4.8 GPM total)
2 tons: 30% glycol 2.57 GPM/ton (5.14 GPM total)

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Flow needed per ton heating:
2.75 tons: pure water 2.4 GPM/ton (6.6 GPM total)
2.75 tons: 30% glycol 2.57 GPM/ton (7.06 GPM)
In the above example (and using Wilo head curve) you can see that head can be max 22
ft. for CX34 to deliver full heating capacity with 30% glycol.
Internal CX34 WILO Pump
Minimun pump speed can be set at P53, minimun speed should not be lower than 40%.
Pump speed can be monitored at C48.
Actual water flow can be monitored at C13, liters per miniute.

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Pipe Insulation
All loop piping must be insulated per local and national mechanical codes.
For design tips and a thickness calculator please visit http://www.armacell.us/knowledge-center/

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NOTE: The CX34 is shipped with the pump in a separate box
attached to the top of the chiller. Please follow the directions
below to install the “C4” internal pump.
Heat Pump Installation
Installation position
Note: Installation must be carried out by professional personnel.
1. The recommended mounting pad should be 1” to 1 ½” above ground level.
2. Proper drainage is required at each outdoor unit to avoid flooding the outdoor unit.
3. To install the unit on a balcony or on top of a building, the installation site must meet the
allowable bearing capacity of the building structure without affecting the structural safety.
4. Ensure the unit is well ventilated; the direction of air exhaust should be kept away from the
windows of neighboring buildings. Adequate service clearance should be kept around the unit.
5. The unit should not be installed in places accompanied with oil, inflammable gases; corrosive
components e.g. sulfur compound, or high-frequency equipment.
6. The unit must be installed upon a reliable machine base or framework. Weight capacity of
framework should be 2 times of the outdoor unit’s body weight. The unit must have extra
precautions taken when it is installed at sites with hurricane/ earthquake hazards.
7. Midair or suspended installation should be avoided as much as possible, falling machines may
result in personal injury and property damage.
Internal pump installation (Remove Top, Front, and Right Side Covers)
Removing the shipping spacer Verify flow direction (UP) Installed properly

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Internal Pump Wiring
Electronics cabinet
Connect the C4 internal pump control wires to the terminal strip labeled (+ and -).
When adding a booster pump wire both power and control wires in parallel with the
internal Wilo pump wiring. Use the same terminals.

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The blue and brown pump control wires are connected to the (+ & -) on
the terminal strip.
Pump power wires. Pump ground wire.

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Clearances (unit: mm) 200mm = 8” , 350mm =14 “, 400=16”, 500=20”,1000=40”

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Electric connection
General
Note!
Electrical installation and service must be carried out under the supervision of a qualified electrician.
Electrical installation and wiring must be carried out in accordance with the NEC.
The heat pump must not be connected without the permission of the electricity supplier and must be
connected under the supervision of a qualified electrician. Wires, spare parts and materials etc. must
satisfy the relevant standards issued by the host country or region.
The heat pump does not include an AC disconnect or switch on the incoming electrical supply. The
power supply cable must be connected to a circuit-breaker with at least a 3 mm breaking gap.
Incoming supply must comply with the technical requirements, with a frame ground wire (neutral is
not used), via a distribution box with breakers.
Voltage range is 208-240vac
Maximum current draw is 13 amps, minimum wire size is 12 AWG, minimum breaker size is 20 AMP.
Main terminal block inside electronics box

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Electric Connections and Component Locator

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Using Internal PWM Pump
System Layout with internal flow switch and Psychrologix Controller MODBUS
connection.