Chiltrix CX45 User manual

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DC INVERTER
AIR TO WATER HEAT PUMP
AC series Heating & Cooling series CX45
Installation and Operation Manual
Version 1

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Table of Contents
Safety Precautions................................................................................................................... 3
Components ............................................................................................................................ 4
Hydronic piping and design guide ........................................................................................... 5
Heat Pump Installation.......................................................................................................... 32
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Electrical Connections ........................................................................................................... 34
System Filling ........................................................................................................................ 42
Control Panel......................................................................................................................... 44
Parameter Checking and Setting........................................................................................... 47
Parameter Checking Only...................................................................................................... 49
Display Modes ....................................................................................................................... 51
Controller Communications .................................................................................................. 52
Fuction Selection switch........................................................................................................ 53
Error Codes............................................................................................................................ 54
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.
Components

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Hydronic Piping and Design Guide
Installation Methods Heating and Cooling
(Heating Shown)
Typical Reverse Return Piping No Buffer Tank
Installation Notes:
1. Minimum pipe size should be no less than 1”, CPVC or 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 CX30 is 6 gpm, design flow is 4.8 gpm. If necessary, a larger PWM pump may be
added to the loop and controlled by the CX30. The second water pump connections can be found in
the wiring diagram.
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. Optionally, a 2 way valve may be
installed at the input tee to prevent any flow through the coil and the FCU will control it.
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. Flow meters with restrictor valves, Watts FlowGuard for example, may be used when reverse return
piping is not an option.
5. Always install a water filter or wye strainer on the supply pipe to the chiller to prevent blockage of
the heat exchanger.

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Piping Examples: Stacked Chillers
With a Buffer Tank and Second Non-PWM Pump
A Buffer tank should be used if the total loop volume is less than 27 gallons. Set parameter 26 to 1, move the
temperature sensor (6) IN2, 63F chiller, to the middle of the tank. The pump in the buffer tank drawing is
controlled by the fan coil control board. For wiring instructions please refer to the fan coil installation
manual. For the pump selection guide see page 27.
*Note –Cooling set points refer to the CX30 outlet temperature, however, the system is managed by a 9F ΔT
controller and is measured in C (5C). Default setting for cooling should be 12C, therefore the controller input would
be 17C. This will create a 54F leaving water temperature which is the correct setting.

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Example of head calculation
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, see the chart on page 8, and example above.
Add up the equivalent length of pipe for the fittings, 13.8’ + 11.7’ =25.5’. then add the actual pipe,
25.5’+115” = 140.5’ of 1” pipe. Once you know the total length of pipe, use the (1” PEX 10% Glycol- Feet of
head per 100 feet of tubing chart), page 16 to get the head for 100’ of pipe, at 40°F and 4.91 GPM, is
(.023251) feet of head per foot. 140.5 x .023251=3.26 ft. of head. Add up all head calculations, 3.26 + 2.3 +
8.35 + 8.3 = 22.21 ft. of head. Next we will look at the Wilo Pump curve on page 31.
If using the CX30SE (Free Cooling option) the units 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. An additional thermal expansion tank may be required. 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.
An air scoop should be installed above the expansion tank to remove any air in the
circulation loop.
PEX Fittings Pressure Drops

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Freeze protection

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