Chiltrix CX50 User manual

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CX50 DC INVERTER AIR TO WATER HEAT PUMP CX50-2
For Use with serial number of CX5022035001 or higher.
Installation and Operation Manual CX50-2
Options for Heating, Cooling and Domestic Hot Water
Cx50-2 Version 1.0
PLEASE REVIEW ENTIRE MANUAL BEFORE PROCEEDING
PLEASE SUBMIT SYSTEM DRAWING & SCHEDULE A COMMISSIONING
CALL BEFORE STARTING THE UNIT
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Table of Contents
Safety Precautions………………………………………………………………………………………… Page 3
CX50 Components………………………………………………………………………………………… Page 4
Hydronic Piping and Design…………………………………………………………………………… Page 5
Buffer Tanks…………………………………………………………………………………………………… Page 8
Head/Pressure Drop Calculations…………………………………………………………………… Page 9
Using Glycol……………………………………………………………………………………………………. Page 12
Heat Pump Installation………………………………………………………………………………….. Page 13
Valves G2, G3………………………………………………………………………………………………… Page 21
Second Heat Source…………………………………………………………………………………….... Page 26
External T-Stat Control……………………………….………………………………………............ Page 27
System Filling/Purging.………………………………………………………………………………….. Page 29
Using The Controller/Operation.…………………………………………………………………… Page 31
Settings Menu ………………….…………………………………………………………………………….Page 33
Administrator Functions and-Parameters……………………………….……………………... Page 39
Mode Switching ………………………………………….……………………………………….……….. Page 40
C-Parameters, P-Parameters and Error code Lists .……………………………...………… Page 42
Dynamic Outdoor Reset Control ……………………………………………………………………. Page 48
Auto Switch-Over ……..…………………………………………………………………………………… Page 50
Commissioning …………………………………………………………………………………………….. Page 51
Footprint/Placement Dimensions --------------------------------------------------------- Page 52
Wilo Pump Flow Curve ………………………………………………………………………………… Page 54
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IMPORTANT NOTE –MAKE SURE TO PROVIDE YOUR DESIGN DRAWING FOR APPROVAL BEFORE GETTING
STARTED, INCLUDING DESIRED OPERATING TEMPERATURES.
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 at all times
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CX50 Components
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Dim Inches
A 17.5
B 29.5
D 17
H 50
W 44.5
W Inc Fan
Shroud
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Hydronic Piping and Design Guide
Installation Methods Heating and Cooling (Heating Shown)
Note: Primary Secondary Piping or Closely Spaced Tees are NOT supported or recommended for use with this
heat pump on the supply-side of the buffer tank, or anywhere in a system without a buffer tank.
A buffer tank must be used for radiant heating. A multi-port buffer tank such as VCT37 should be used to
combine multiple heat pumps. Please do not try to balance multiple cx50 units with equal-piping or reverse
return design. It will not work as expected due to having multiple variable speed pumps.
An “additional volume” tank must be used when there is no buffer tanks and there is less than 15 gallons of
total system fluid volume.
Minimum pipe size should be no less than 1”, CPVC or Oxygen Barrier PEX, reverse return piping is preferable to
assist balancing. Reverse-return will not fully balance multiple chillers as the variable speed pumps may not
always operate at the same speed. 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 cx50 is 6-7.5 gpm, design
flow is 5.2 gpm. If necessary, a second Chiltrix-provided PWM pump may be added to the loop and controlled by
the cx50. The second water pump connections are always in series with the internal pump. The loop example
above is designed with wild coils (loads). Water flows through the fan coils at all times, if there is a call for heating
or cooling the FCU controls will turn the fan on, adjust fan speed, etc. BTU leakage from a wild coil is around the
same as a light bulb, not enough to worry about. Valved options are available and Chiltrix fan coil units can
support valves, or be used to start/stop a pump, contact Chiltrix support to discuss.
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.
Always install a water filter or wye strainer on the return side pipe before it enters the heat
pump to prevent blockage of the heat exchanger or pump/flow meter problems.
Do not use CPVC if glycol percentage will be above 25%. Do not use PVC. 5
See Design Guide Here
https://www.chiltrix.com/documents/chiller-options.pdf
PLEASE ALWAYS SUBMIT YOUR DESIGN TO
CHILTRIX FOR APROVAL
Generic design, not all components shown.

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Piping Examples: Stacked Heat Pumps
PLEASE SEND YOUR PROPOSED FINAL DESIGN TO CHILTRIX SUPPORT DEPARTMENT FOR
APPROVAL, COMMENTS, AND SUGGESTIONS
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Preferred Method For 2 or 3 Units:
Non-Preferred Optional Method, multiple heat
pumps piped in parallel:
(Requires additional loop pump supplied by
installer)
See Design Guide Here
https://www.chiltrix.com/documents/chiller-options.pdf
PLEASE ALWAYS SUBMIT YOUR DESIGN TO
CHILTRIX FOR APROVAL
Optional Method, multiple heat pumps piped in parallel:
(Requires additional loop pump supplied by installer) This
pump must have flow/head curve sufficient to overpower
the total head/curve of both 2nd and any 3rd unit.

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Piping Examples
PLEASE SEND YOUR PROPOSED FINAL DESIGN TO CHILTRIX SUPPORT DEPARTMENT FOR
APPROVAL, COMMENTS, AND SUGGESTIONS
Pipe Insulation
All loop piping must be insulated per local and national mechanical codes. Any piping in a
system with chilled water (used for cooling) must also be sealed vapor tight to prevent
condensate issues. For design tips and a thickness calculator please visit
http://www.armacell.us/knowledge-center/
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See Design Guide Here
https://www.chiltrix.com/documents/chiller-options.pdf
PLEASE ALWAYS SUBMIT YOUR DESIGN TO
CHILTRIX FOR APROVAL
Note: The above design should not be used for more than 2x fan coil units.
If more than two, consider using a VCT37 tank and locating the fan
coil units on the load side parallel to the radiant.

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Using a Buffer Tank w/ Radiant
Example below shows optional DHW, optional V18 backup heater, fan
coils, and radiant. The radiant is attached to the load side of a buffer
tank.
For V18b information please see the V18b Manual available on the
Chiltrix website documents page.
For DHW or buffer tank installation information see the Chiltrix Tank
Manual.
Primary / secondary piping is not supported, when connecting to a floor heating loop always use a buffer
tank. Buffer tanks are generally needed only with floor heating with the Chiltrix system, or to combine
multiple cx50 units, but are still always recommended to improve performance.
IMPORTANT NOTE ABOUT BACKUP HEAT
Do not ever use heating elements in a buffer tanks for backup heat. The element capabilities of the
buffer tank are provided for emergency heat only. Not “backup” heat. Contact Chiltrix with any questions
about emergency or backup heat options. See details in the Chiltrix Tank Manual.
The radiant loop pump in the buffer tank drawing is controlled by the customer’s manifolds, floor loop
controls, valves, load-side pump, etc. The buffer tank isolates the pumps from each other providing
hydraulic separation and thermal buffering.
A 37 gallon buffer tank is used generally for best performance with a single cx50. 50-80 gallons is used for
systems of two or three cx50s, and is always used when multiple cx50s are to be combined. A G3 seasonal
valve may be used to isolate the tank in cooling mode, if applicable, note that isolating the buffer tank in
this manner may cause the need for an additional volume tank to be added.
See more designs here:
https://www.chiltrix.com/documents/chiller-options.pdf
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See Design Guide Here
https://www.chiltrix.com/documents/chiller-options.pdf
PLEASE ALWAYS SUBMIT YOUR DESIGN TO
CHILTRIX FOR APROVAL
IMPORTANT
Check all tank ports including under any
element covers to make sure any unused ports
are plugged. Pre-plugged ports may be only
finger-tight. Check ALL ports and plugs
for water tight fit.

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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 and route it so as 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.
All measurements in feet
6 Tees @2.3ft. Of pipe = 13.8 ft. of pipe
7 Couplings @ 1.3 ft. of pipe = 11.7 ft. of Pipe
120’ of actual Pex Pipe
145.5’ of Pex @ 4.76 GPM and 10% Propylene Glycol
145.5’ x .05 = 7.02 ft of Head per length of pipe based on frictional losses
CXI 85 Fan Coils = 9.2 ft. of Head
Total Head = 16.2 ft.
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Head Calculations -Continued:
The previously shown example loop has a volume of 4.5 gallons. The internal thermal expansion tank is 2 liters
or .52 Gallons. The volume of the cx50 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 or damage to flow meter.
WYE STRAINER (from supplyHouse.com)
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THE WYE STRAINER SHOULD BE CLEANED OUT AFTER 1-2 DAYS OF OPERATION
TO REMOVE ANY COLLECTED DEBRIS REMAINING FROM INSTALLATION

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GRUNDFOS UPMXL 25-124 230V PWM
This is the Grundfos pump head curve for Chiltrix CX50 and is shipped
with 2022 and newer CX50 units.
Note, the CX50 itself has 16 Ft. Head at 10 GPM.
This leaves about 24 ft of head net of the chiller.

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Glycol
While not always required, customers in colder climates that are subject to occasional freezing should add an
appropriate percentage of food-grade propylene glycol to the system. NEVER USE ETHYLENE GLYCOL.
Ethylene Glycol is a poison. Propylene Glycol is a non-toxic anti-freeze also used in food, cosmetics, etc. and
can safely be used. IF YOU ARE IN AN AREA THAT MAY HAVE <32 °F WEATHER YOU SHOULD CONSIDER
GLYCOL. FREEZE DAMAGE FROM LACK OF GLYCOL IS NOT COVERED UNDER WARRANTY.
Food-Grade Glycol is available at Home Depot and other retailers. You may also consider HSE Corn Glycol
(Biodegradable Food-Grade Glycol made From Corn
https://www.hotspotenergy.com/corn-glycol/
Below is a Freeze Point Chart For Propylene Glycol Mixed w/ Water
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. Do NOT use PVC piping.
Flow Rates
Required flow rate changes with the glycol %.
Note the “500” formula water factors are adjusted as follows (based on 2,3 tons capacity):
Example:
Based on load calculations a given system needs to deliver
a maximum of 31,000 BTU with 30% glycol:
BTU/31,000/480=6.45 GPM
(BTU/water factor=required flow rate)
Use the required flow rate to calculate head based on the Head Flow Curve on the following page.
Minimum pump operating speed can be set at P69, minimum speed setting used should not produce a flow
rate in your system of less than 9 L/min and generally should not be set lower than 40%. Pump speed can be
monitored at C51, 1 is lowest (idle, when compressor off) and 10 is highest speed. Actual water flow can now
be monitored on the desktop and at C47, liters per minute. Test at full pump speed. 1 L/min = .264 GPM // 1
GPM = 3.78 L/min
00% glycol use 500 24,000/500/10=4.8 GPM
10% glycol use 494 24,000/494/10=4.85 GPM
20% glycol use 488 24,000/488/10=4.91 GPM
30% glycol use 480 24,000/480/10=5.00 GPM
40% glycol use 463 24,000/463/10=5.18 GPM
50% glycol use 442 24,000/442/10=5.43 GPM
00% glycol use 500 36,000/500/10=7.42 GPM
10% glycol use 494 36,000/494/10=7.28 GPM
20% glycol use 488 36,000/488/10=7.37 GPM
30% glycol use 480 36,000/480/10=7.50 GPM
40% glycol use 463 36,000/463/10=7.77 GPM
50% glycol use 442 36,000/442/10=8.14 GPM
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Chiltrix Heat Pump Installation
Heat Pump Installation
Installation position
Note: Installation must be carried out by professional personnel.
The recommended mounting pad should be at least 1 ½” above ground level. If you are in an area where snow
occurs, mount the unit high enough above grade to avoid blockage by drifting snow. You can consider a
properly rated wall mount if desired.
Proper drainage is required at the heat pump unit to avoid flooding the outdoor unit with water or ice. Make
sure condensate has a way to rapidly and completely drain away from the unit.
To install the unit on a balcony or on top of a building, the installation site must meet the allowable load
bearing capacity of the building structure without affecting the structural safety. 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. The unit should not be installed in places
accompanied with oil, inflammable gases; corrosive components e.g. sulfur compound, or high-frequency
equipment.
Outdoor Unit Placement / Clearances
(Unit: mm) 200mm = 8” , 350mm =14 “,
400=16”, 500=20”,600 = 24”,1000=40”
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Chiltrix Heat Pump Installation
NOTE: The cx50 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” Grundfos internal pump.
Internal Pump Installation
(Remove Top, Front, and Right Side Covers) DO NOT BEND OR STRESS
THE PIPING, this may cause a broken joint or leak where it joins the heat
exchanger. Cut the insulation and peel it back out of the way of the
flange nuts. This will allow installation of the pump without bending
either of the pipes. The pump will slide in between the pipes with the
washers.
Peel back the insulation Removing the shipping spacer Verify flow direction (UP) Installed properly
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Note the orientation.

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Internal Pump Wiring
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Pump Control wires
Blue is negative (left)
Brow is positive(right)

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The blue and brown pump CONTROL WIRES are connected to the (+ & -) on
the Pump PWM terminal connector at the top of the main control pcb.
Pump POWER wires. Pump GROUND wire.
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Pump Control wires
Blue is negative (left)
Brow is positive(right)

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Electrical 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 be connected under the supervision of a qualified electrician. Wires, spare parts and
materials etc. must satisfy the relevant standards and codes issued by the host country or region.
The heat pump does not include an AC disconnect or switch on the incoming electrical supply which will be
required. 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. Allowed Voltage range is 208-240vac. Maximum wire size must
be suitable to your code and meet NEC requirements, breaker size is 30 AMP, for the cx50.
It is advisable to add surge suppression with transient voltage protection to the circuit powering the
chiller.
Main terminal block inside electronics box
Example MOV transient voltage suppressor
https://www.mouser.com/_/?Keyword=V300LA40AP
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Electric Connections and Component Locator
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HMI
controller plug in
C4 Pump and
V18 SSR connections
C4=> Blue is Negative(1)
Brown is positive (2)
V18 SSR=> Black wire to
negative(3)
Red wire to positive (4)
12 3 4
Waterflow
Sensor plug
Outputs: E2,
4way valve, bypass,
Ect.
Temp sensors

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cx50 System Wiring Diagram
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HI-Res diagram located on
Chiltrix Documents & Specifications, Chiller Heat Pump Price List & Cost, Manuals

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When using a second NON-PWM water pump
When using a second NON-PWM water pump, use terminals L2 and C6L for relay coil
power only. Do not connect a pump directly to L2 and C6L, always use a relay with a 240
vac coil. This pump will only run when the PWM pump is running. Setting P52=0, and
P54=1, will shut C6 off when the chiller reaches its set point.
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