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V18-B Installation and
Operation Manual
Thank you for purchasing the worlds most advanced and efficient hydronic backup heating solution for air-to-water heat
pumps. The V18 adds backup heat in more precise amount, with variable & automatic real time control. For use with
Chiltrix air-to-water heat pumps.
The new B-Model uses the Chiltrix CX34 onboard controls and does not need a
separate V18 controller, requires CX34 firmware P228-S10-V200B26 or later, it
generally applies to all CX34 units produced after November 2019. Some older
units also have this firmware version but it must be verified.
WARNING!
THIS PRODUCT USES HIGH VOLTAGE ELECTRICITY!
DO NOT OPEN OR SERVICE THIS DEVICE UNLESS POWER HAS BEEN
DISCONNECTED
This product must be assembled and installed by a licensed electrician in
a manner that conforms with all national and local electrical and safety
codes. All high voltage electrical components meet UL requirements.
SERVICE OR REPAIR TO BE PERFORMED ONLY BY A LICENSED ELECTRICIAN
DO NOT DRY FIRE THIS DEVICE / INSTALL VERTICALLY ONLY
USE 208-240V 30a Circuit with GFCI Breaker.
Note special procedure for chilled water capable systems.
Read the entire manual before beginning installation.
Follow all instructions.
1
Version 1.0
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Summary of Contents for Chiltrix V18-B
- Page 1 The V18 adds backup heat in more precise amount, with variable & automatic real time control. For use with Chiltrix air-to-water heat pumps. The new B-Model uses the Chiltrix CX34 onboard controls and does not need a separate V18 controller, requires CX34 firmware P228-S10-V200B26 or later, it generally applies to all CX34 units produced after November 2019.
- Page 2 The V18 communicates with the Chiltrix air-to-water heat pump via low voltage signaling. The Chiltrix heat pump always understands the load as part of its capacity management program, as such, if a heating shortfall is detected, the quantity of such shortfall is known.
- Page 3 Shown above: V18 mounted on a painted plywood board with Uni-struts. The pipe fittings are NPT 2” female, use a bushing or adapter to match it to your piping. Always use Teflon tape /dope for any threaded pipe connection, particularly important to liberally apply when using with stainless steel fittings.
- Page 4 Example showing proper placement. Always installed *before* any loads, and *before* the G1 DHW valve (if DHW is used in the system) or *before* any G3 valve (if used). See proper placement in the following examples. The V18 must be installed in an upright orientation (vertical) and the water flow entry should be from the bottom.
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Page 5: Installation
Installation The in-line V18 Heater unit(s) must be installed indoors, in the main chiller loop between the Chiltrix outdoor unit(s) and any loads such as fan coils, air handler, or buffer tank. If DHW is used, the V18 would be before the G1 valve (and before any loads. - Page 6 Two (or three) V18 inline heaters may be mounted together (series piping), note they are wired separately for power, each with a 30a GFCI circuit for main power. Control circuits are wired in parallel and the CX34 controller can manage up to 3x V18 units. Shown below, two V18Bs piped in series.
- Page 7 208 to 240 VAC GFCI circuit breaker, via an included 40a Solid State Relay (SSR) used to provide real time control over the power level and manage the rate of addition of heat to the Chiltrix main loop. The power from one circuit breaker pole (L1) passes through the relay box and connects directly to the in-line heater’s thermal overload interrupt device.
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Page 8: Chilled Water
Assembly of this system and all connections to the buildings electrical power system should be performed by a qualified licensed electrician according to local and national electric codes. CHILLED WATER IMPORTANT NOTE* If the V18 will be installed in a system that performs cooling operation at times, make sure to thoroughly seal around the... - Page 9 Control Wiring Output Cable Control wiring from the PWM2 terminal to the SSR(s) consists of a cable connected to the (+) red wire and the (-) black wire on the solid state relay (SSR). If more than one in-line heater/SSR arrangement is used then a jumper cable is used.
- Page 10 ASSEMBLING COMPONENTS HEATER ELEMENT REPLACEMENT INSTRUCTIONS CAUTION – During assembly/installation or after removing an element for replacement, assure that all inner and outer sealing surfaces are clean and free of debris prior to installing the new o-rings and element or leaks may occur.
- Page 11 Visually inspect the element after installation and verify that that the element is not in contact with the inside wall of the heater body. Failure to do so may cause failure. Step 3 WARNING: Hold the Bottom Hex (x) with a 1/4” open end wrench when tightening the Terminal Nut to prevent rotation and damage to the epoxy end seal.
- Page 12 Install 2” NTP bushings or adapter fittings to match up to the plumbing. Use Teflon tape on all treaded fittings to prevents leaks. Once the heater units are installed, pressurize your loop and check for any leaks. Flush fill, and pressurize the loop according to the Chiltrix Installation and Operations Manual.
- Page 13 240v, verify the rating of the heating element used.(Default 230V) P107 AC heat transfer coefficient 100-600WF Default 500 (see water factor chart page 15) P108 AC Voltage compensation, set = 0 (unless otherwise instructed by Chiltrix support dept.)
- Page 14 Backup Heater Operation: E2 AC (V18b) heater start condition: 1. Before the V18b can start, the ambient temperature (as measured by C02 in Status, details menu), must be below the P57 setting. 2. When the compressor cannot meet the BTU load for a period of 15 minutes, based on the AC inlet water temperature <...
- Page 16 Notes Re: Controllers When the V18 is active, any changes to temperature parameters entered via the standard controller or via the Psychrologix controller (including outdoor reset) will be ignored. Outdoor Reset function, if used with a Psychrologix controller, must be set at to least 1 degree higher ambient trigger than what is set as the V18 parameter 3 (outdoor air trigger).
- Page 17 Troubleshooting The backup heater is off by default. Activation can only occur under certain strict conditions and only if backup heat is needed. There are several levels of safety. •The GFCI breaker will trip if there is a ground fault. This protects the system and users in the event of a short circuit or loose wire in the power wiring.
- Page 18 Insufficient flow, particularly with multiple V18bs in series, may cause this. If the V18b backup unit stops working, first check the Chiltrix standard controller for any error codes. Check for loose wires, see troubleshooting section. Make sure nothing is blocking flow through the heater.
- Page 19 NOTICE Bulletin Regarding V18 Installed With CX34 Systems Used For Cooling CHILLED WATER IMPORTANT NOTE* If the V18 will be installed in a system that performs cooling operation at times, make sure to thoroughly seal around the white ABS cover and inside the Liquidtight conduit with silicone as a minimum precaution.
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