Hayward pool heater lo

I fixed Lo error! hayward spa heater was giving me a LO error when I turned it This is how I fixed it within less than a minute easy steps.

Hayward pool heater lo. HeatPro Heat Pump 140k BTU. Hayward. SKU: HP21404TC. High performance, energy-efficient HeatPro heat pumps quietly and economically maintain the ideal water temperature at all times. Add to Compare. Add to Export. Overview. Specifications.

How to turn on a Hayward H series Heater#blpools#hayward#heater

By following these guidelines, you can quickly get your pool heater back up and running efficiently. Hayward Pool Heater Parts Diagram Hayward Pool Heater BO Code What Does BO Code Mean? The Hayward Pool Heater BO code indicates a flame-sensing fault. It means that the heater is unable to detect the flame properly.If you're looking for help fixing your Hayward Pool Heaters, look no further! Our comprehensive Hayward Pool Heaters error code guide will explain common iss...When your Hayward pool heater flashes the ‘bo code’, it’s signaling that there’s an issue with the bypass operation. Here’s a strategic approach to get your heater back to optimal functionality. Reset the Heater: Turn off the heater and the circuit breaker for 30 seconds. Power up the system again to see if the ‘bo code’ persists.Change the sand in a Hayward sand filter by washing the old sand through the drain plug using a garden hose and then replacing it with 300 pounds of 20-mesh swimming pool filter sa...Universal H-Series Natural Gas 400,000 BTU Low NOx. Hayward. SKU: W3H400FDN. The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional. Add to Compare. Add to Export.INNOVATION MADE EASY. Hayward Commercial Aquatics offers a full range of industry-leading innovative products designed to work together as one total system to help every commercial pool perform at its absolute best. Our products set the technological standard while providing unmatched performance, efficiency, reliability, versatility and ease ...LO Code Pages 40-43 IF Code Pages 44-46 AC Code Page 47 AO Code ... Heater must then be in Spa or Pool Mode for operation. The heater will ... Hayward Part # FDXLFSKF30 (Qty. 10) Step 1: Page 14 Verify incoming voltage to heater is present (110-125 or 220-245 VAC), if

Stumbling upon a ‘LO’ code on your Hayward heater can be quite the head-scratcher. Don’t worry, you’re about to unravel the mystery behind this cryptic message. This code typically indicates a water temperature sensor error, but it can also be a sign of other underlying issues with your pool heater. The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving you an energy savings of up to 18%! This unit is perfect for the environmentally conscious Pool and Spa owner thanks to its Low NOx capabilities. Pomeade IDXL2DB1930 Display Board Replacement for Hayward Heater IDXL2DB1930 Display Board, Compatible with Hayward Universal H-Series Low Nox Induced Draft Heater, H400FDN HD150FDN dummy Hayward W3H150FDP Universal H-Series 150,000 BTU Propane Pool and Spa Heater for In-Ground Pools and SpasHayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. Gain insight. ... Phase Heaters: 1.0000: Pool Type: In Ground: Product Dimensions: 24 " x 19 " x 29.5 "Product Height: 24 in: Product Length: 29.5 in: Product Weight: 135 lb: Product Width: 19 in:Hayward - Inground Pool Heater - Universal H-Series - Lo-Nox. Categories. Above Ground Pool Packages; Above Ground Pool Liners . Above Ground Pool Liner Accessories ; ... Lo-Nox - Inground Pool Heater Hayward. MSRP: $3,498.99 Your Price: $2,599.99 (You save $899.00 ) SKU: UPC: * Current Stock: Quantity: Decrease ...LO on a Hayward Heater#VSP#2speedpump#backwashfilter#cleanfilter#aqualogicHayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. Gain insight. ... Phase Heaters: 1.0000: Platform: Square: Pool Type: In Ground: Product Dimensions: 37 " x 30.5 " x 33.6 "Product Height: 37 in: Product Length: 33.6 in: Product Weight: 230 lb: The Universal H-Series Low NOx heater has an 84 percent industry-leading thermal efficiency and complies with all current California air quality emission standards. The low NOx emission makes it a perfect choice for the environmentally concerned pool owner. Enjoy a warmer pool this season without your fuel costs skyrocketing.

My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the filters - still LO 2. Checked wires at pressure switch for continuity - still LO 3.Do you know how to make a solar water heater using a can? Find out how to make a solar water heater using a can in this article from HowStuffWorks. Advertisement You can harness th...First, turn off the power to the pool heater circuit breaker. This should immediately shut down the pool heater. If the circuit breaker does not shut off, you should call a professional service technician to come out and inspect the problem. Next, check the fuse box located near the pool pump. The fuses should be in good condition.Turn the thermostat all the way up on the heat pump. These units are not compatible with 3 wire remotes. For 2 wire air switch installations remove the jumper between terminals 1 & 2 and replace it with the 2 wires from your switch. Set the thermostat on the heat pump to the desired temp. Wiring Diagram HPABG / HP380.

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Answering a viewers request on how to add and program a newly installed heater to a Hayward OmniLogic Automation system.PitschPlumbing. Generally, LO refers to the pressure switch, water pressure. This can be caused by either the diaphram in the flow switch has failed or the filters is clogged and/or pump is unable to make enough pressure to make the switch. Open the front panel of the heater and look up in to the right. You will see a round part with 2 wires ...Stumbling upon a ‘LO’ code on your Hayward heater can be quite the head-scratcher. Don’t worry, you’re about to unravel the mystery behind this cryptic message. This code …Fits hayward universal h-series low nox pool heater models h150fdn, h150fdp, h200fdn, h200fdp, h250fdn, h250fdp; Also fits hayward universal h-series low nox pool heater models h300fdn, h300fdp, h350fdn, …H250FDNASME, H250FDPASME, H400FDNASME, and H400FDPASME. H135ID1, and H135IDP1. Water Pressure Switch Replacement Procedure. FDXLWPS1930 for Universal H-Series (Forced-Draft) Heaters. This kit is intended to be used only with Hayward Universal H-Series (forced-draft) gas heater models. These heaters may be.

THanks for your help and advice I have an older H400 Hayward Pool heater that is struggling to heat the water . Mostly it is working but keeps going off on "LO" . BUt after a time it seems to cool and …Posted April 16, 2010. The "LO" code means "Loop Open", referring to your safety loop switches. Most likely it's your pressure switch that's open due to low water flow usually caused by a dirty filter. The "60" code is really "bO" meaning "bypass operation" in which your heater's internal thermostat is bypassed so as to control the set ...Follow the included steps to place the heater in bypass mode for external control. Step 1. Press the ‘MENU ICON’ button to place the heater in ‘STANDBY’ mode. Step. The ‘SPA’ indicator should illuminate & the display should show the Max Temp set point. Step 2. Press and hold the minus & plus buttons for 3 seconds.The Hayward Universal H-Series gas heater is one of the most energy-efficient Pool and Spa heating solutions on the market! Its ground-breaking hydraulic design reduces pump circulation run time, giving you an energy savings of up to 18%! This unit is perfect for the environmentally conscious Pool and Spa owner thanks to its Low NOx capabilities.Hayward Heaters H-Series ED2 Parts Diagram H-Series Heaters, H150ED2,H200ED2,H250ED2,H350ED2, H400ED2 Heaters. Hayward Heaters H-Series Parts List H-Series Heaters. Key Model Description Product ID Buy Me; 1: HAXJKT1150: Jacket Top Assembly, 150: HE-05510: BUY ME : HAXJKT1200: Jacket Top Assembly, …What Does LO Code Mean On The Pool Heater? Hayward Pool Heater LO Code [Reasons + Solutions] 1. Water Temperature Switch Malfunction. 2. Defective Vent Pressure …Hayward Insights provides expert advice, tips, and industry updates to help pool owners and enthusiasts with their swimming pool experience. Gain insight. ... Phase Heaters: 1.0000: Pool Type: In Ground: Product Dimensions: 24 " x 25 " x 29.5 "Product Height: 24 in: Product Length: 29.5 in: Product Weight: 165 lb: Product Width: 25 in:Jun 14, 2016 · I have Hayward H150FDN Universal H-Series, Low NOx, 150,000 BTU, Natural Gas, Pool and Spa Heater and I am getting a LO code with is a flow problem. I have my intermatic timer set for 755am to turn on and give my equipment power, then at 8am the Hayward pump turn on. Aug 3, 2014 ... Audio turned out weird, so you may have to turn the volume up! How to diagnose and repair your Hayward H Series (H250) Gas pool heater.NOTE: the maximum temperature set point is 104° F. 13. Hayward H250FDP | Universal H Series Troubleshooting Guide - Page 14. in bypass mode for external control. Step 1 Step 2 Press the 'MENU ICON' button to place the heater in 'STANDBY' mode. Step 3 Press and hold the minus & plus buttons for 3 seconds.

Electric – the energy where this heater comes from is through electricity. An electric heater is usually made of an electrical resistor, and it works throughout the principle of Joule Heating. Solar – Through the help of the sun’s heat and solar panels, the water heats, then the water from the pool has been pumped into the panels. It is heated before throwing it …

My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the filters - still LO 2. Checked wires at pressure switch for continuity - still LO 3.Hayward Pool Products Inc is a leading manufacturer of high-quality pool equipment, including pumps, filters, heaters, and cleaners. If you’re lucky enough to own one of their prod...Hayward FDXLWPS1930 Water Pressure Switch Replacement for Hayward Universal H-Series Low Nox Pool Heater,Black 4.7 out of 5 stars 392 10 offers from $37.38We have 3 Hayward H300FDP manuals available for free PDF download: Troubleshooting Manual, Service & Installation Manual, Owner's Manual Hayward H300FDP Service & Installation Manual (64 pages) POOL AND SPA/HOT TUB HEATERSApr 22, 2020 ... How-To Operate a Hayward H-Series Pool Heater ... Hayward Heater on LO. B&L Pools•46K views · 1 ... Hayward Pool Heater (W3H250FDP Universal H- ...HI My Hayward Hseries pool heater shows a LO and stops working when it rains. My temp dropped from 92 to 80. Contractor's Assistant: Who manufactured the pool? I can't recall. It is a semi-inground purchased through Great Escape 5 years ago. Heater is 5 years old. I replaced the heating tubes last summer.Hawyard H400 Heater "LO" flashing. Thread starter TNorth225; Start date Apr 21, 2009; Jump to latest Follow Reply Forums. Equipment - Build ... I recently bought a house with a in ground pool/hot tub combo that includes a Hayward H400 pool heater. It was a bank owned house where the pool had been sitting without filtering for ...Available in 150,000, 200,000, 250, 000, and 400,000 BTUs, the Universal H-Series heater can raise the temperature of an 800-gallon pool 30 degrees in less than an hour—you’ll feel the benefits the moment you step into the water. The Hayward Universal H-Series Low NOx can be added to inground pool kits sold by Pool Warehouse!Offers heating that is energy efficient and environment friendly. Please review the For Your Swimming Pool brochure. Patented bypass design ensures better hydraulic performance. View More Details. BTU Rating: 399900. 199900. 200000. 399900. Pickup at South Loop.

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Enter a postal code to find the nearest Hayward authorized pool professional. Postal Code: How far from the above postal code do you want to search? Enter the miles in the box …H-Series BTU (British Thermal Units – heating unit measure) Hayward Pool Heaters either Natural Gas or Propane, have BTU range from 150K BTU – up to 400K BTU. For more information and exact model specifications please visit the online store: Hayward Universal H Series 400K BTU Natural Gas Pool Heater -( H400FDN , Hayward ) Model W3H150FDP. Cupro-Nickel heat exchanger with patented "V" baffle design increases the life of your unit and reduces heating time. Patented Polymer Header design provides superior hydraulic performance which saves energy and protects against damage due to high flow conditions. 2" x 2 1/2" CPVC unions. How to turn on a Hayward H series Heater#blpools#hayward#heaterHere you’ll gain easy access to information regarding your favorite Hayward products. Whether you are looking for a Quick Reference Guide, ... Learn about maintenance, innovation, pool safety & other insights from Hayward. Explore. Tools. Utilize tools and downloads of mobile apps ... Universal H Series and ASME Gas Heater Installation, ...Apr 22, 2023 · I fixed Lo error! hayward spa heater was giving me a LO error when I turned it This is how I fixed it within less than a minute easy steps. HeatPro In Ground Heat Pump, 140,000 BTUs, Square Platform. Hayward has an advanced lineup of gas heat and electric heat and heat+chill solutions to deliver the ultimate control of your water temperature. Jan 11, 2022 · Step 3: If yes, disconnect the p4 plug from the connection and take the voltage reading of pins 4 and 6. Here you will also get reading for 110-125 VAC. Step 4: In case you are getting the right voltage in both cases, it’s a must say that the fuse is blown and you need to replace it. The Hayward Universal H-Series Natural Gas Pool and Spa Heater brings you quiet, efficient heating for your pool and spa. Hayward Natural Gas heaters are quiet, certified for low NOx emissions and eco-friendly making for a dependable, safe pool heater you can trust. Combining advanced technology with universal-fit flexibility, the Hayward H ... ….

The Hayward pool heater spa mode is designed to maintain a specific “spa-like” temperature in the pool. To use this mode, enable “Spa mode” from the control panel, set the required temperature, and let the pool heater warm the water. Once ready, test the water. This process is a joy to behold for those who want to soak themselves in ...You need to put the heater in STANDBY Mode to get the bO code on the heater display. Press the mode button once to get the heater in STANDBY Mode. First, press and hold on to the Down key. Then, press and hold down the MODE key as well. You need to keep holding both keys for about three seconds. At this point, the “bO” message …Pomeade IDXL2DB1930 Display Board Replacement for Hayward Heater IDXL2DB1930 Display Board, Compatible with Hayward Universal H-Series Low Nox Induced Draft Heater, H400FDN HD150FDN dummy Hayward W3H150FDP Universal H-Series 150,000 BTU Propane Pool and Spa Heater for In-Ground Pools and SpasKey Takeaways. The P5 code on Hayward pool heaters indicates a problem with the pressure switch. Common causes of the P5 code include clogged filters, improper water flow, and electrical issues. Troubleshooting steps for the P5 code involve checking water pressure, inspecting the heat exchanger, and verifying the gas supply.May 6, 2022 · First, reset your heater thermostat. Now, set the temperature point below 104 degrees. Then, set the function “Ok”. Always keep the temperature under 104 degrees to allow the heater to heat the water at this temperature. Note: Learn how to fix CE code on Hayward pool heater. 4. Inspect the breaker for the heater and make sure it is On. The heater/heat pump is detecting a problem. Usually, the heater will display an error code on its display when …The LO code on a Hayward heater means Limit Open, where one of the limit switches is not closing to complete the circuit. To clear the LO code, fix or replace the wiring on the limit switches and any other issues with your heater’s limit switch, and you may need to do a backwash to clear out any obstructions.* Texas Heater Kits Available * 500,000 BTU provides unprecedented speed to heat, with just 2 models delivering 1 million BTU’S while using minimal pump room space Specifications Hayward pool heater lo, Aug 17, 2022 · Checking the Pool Heater Circuit Breaker. First, turn off the power to the pool heater circuit breaker. This should immediately shut down the pool heater. If the circuit breaker does not shut off, you should call a professional service technician to come out and inspect the problem. Next, check the fuse box located near the pool pump. , Faulty water temperature switch, malfunctioning vent pressure switch, and defective temperature limit switch are accountable for displaying the Hayward pool heater LO code. Also, the damaged flow switch diaphragm and clogged filter are responsible for showing this code on your pool heater. However, going through the article, you will learn all about reasons behind LO, Hayward Pool Products Inc is a leading manufacturer of high-quality pool equipment, including pumps, filters, heaters, and cleaners. If you’re lucky enough to own one of their prod..., The LO code on a Hayward heater means Limit Open, where one of the limit switches is not closing to complete the circuit. To clear the LO code, fix or replace the wiring on the …, Pomeade IDXL2DB1930 Display Board Replacement for Hayward Heater IDXL2DB1930 Display Board, Compatible with Hayward Universal H-Series Low Nox Induced Draft Heater, H400FDN HD150FDN dummy Hayward W3H150FDP Universal H-Series 150,000 BTU Propane Pool and Spa Heater for In-Ground Pools and Spas, The tech did the install and ran the heater only for a few minutes to check for ignition and stuff. He had done some other plumbing work so he didn't want to run in too long, or the pool pump either, so that the PVC glue really had some time to cure. The heater is a 400,000 BTU Hayward Universal HC Series Model HDF400 Pool Heater., Reach out via phone at (908) 355-7995 or email for unparalleled customer service and technical support to keep your pool in optimal condition. ... Hayward Insights provides expert advice, ... Pump, Filter, Heater, Lights, & Whole Goods Tech Support. 1 (908) 355-7995 (U.S.) Contact us by letter: Hayward Holdings, Inc., POOL AND SPA/HOT TUB HEATERS H150FD, H200FD, H250FD, H300FD, H350FD, H400FD & H500FD MODELS SERVICE & INSTALLATION MANUAL FOR YOUR SAFETY This product must be installed and serviced by authorized personnel, qualified in pool/ spa heater installation. Improper installation and/or operation can create carbon monoxide gas, TOP VENT PRO-INVERTER 13.5kW. SKU: PASRW030PUBP. Add to Compare. Showing 1-12 of 22. 1. 2. Heating swimming pools is a wise investment as it increases its value and extends the swimming season. So to graduate to a higher degree of comfort and control, choose a Hayward pool heater., Universal H-Series Propane Gas 300,000 BTU Low NOx (Expert Line) Item #H300FDP. EXPERT LINE products are only available through your local pool professional. The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional. Standard cupro nickel heat exchanger., Electric – the energy where this heater comes from is through electricity. An electric heater is usually made of an electrical resistor, and it works throughout the principle of Joule Heating. Solar – Through the help of the sun’s heat and solar panels, the water heats, then the water from the pool has been pumped into the panels. It is heated before throwing it …, Hayward H300FDP Pdf User Manuals. View online or download Hayward H300FDP Owner's Manual, Troubleshooting Manual ... Brand: Hayward | Category: Swimming Pool Heater | Size: 6.96 MB Table of Contents. Table of Contents. 2 ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58., Dive in with a dealer near you. Our network of certified personnel can help you build your pool, recommend a product, repair a faulty product, and test your water. Find a professional near you. Hayward offers environmentally responsible, cutting-edge pool and spa equipment for residential and commercial, in-ground and above-ground pools. , When your Hayward pool heater flashes the ‘bo code’, it’s signaling that there’s an issue with the bypass operation. Here’s a strategic approach to get your heater back to optimal functionality. Reset the Heater: Turn off the heater and the circuit breaker for 30 seconds. Power up the system again to see if the ‘bo code’ persists., When your Hayward pool heater flashes the ‘bo code’, it’s signaling that there’s an issue with the bypass operation. Here’s a strategic approach to get your heater back to optimal functionality. Reset the Heater: Turn off the heater and the circuit breaker for 30 seconds. Power up the system again to see if the ‘bo code’ persists., NJ. Aug 7, 2021. #1. Hello, I have a H150FDN pool heater. It's worked all summer so far, but last week I noticed that it would turn on for a few minutes then turn off and show Lo. The filter is clean and the output is strong. I ordered a new pressure switch, but in the meantime I took the two wires that connect to the switch and made a jumper ..., You need to put the heater in STANDBY Mode to get the bO code on the heater display. Press the mode button once to get the heater in STANDBY Mode. First, press and hold on to the Down key. Then, press and hold down the MODE key as well. You need to keep holding both keys for about three seconds. At this point, the “bO” message …, Aug 22, 2022 ... A super easy fix for a stuck button on a Hayward pool heater. Pool Heater Replacement Control Panel Keypad Membrane Switch Compatible with ..., INNOVATION MADE EASY. Hayward Commercial Aquatics offers a full range of industry-leading innovative products designed to work together as one total system to help every commercial pool perform at its absolute best. Our products set the technological standard while providing unmatched performance, efficiency, reliability, versatility and ease ..., INNOVATION MADE EASY. Hayward Commercial Aquatics offers a full range of industry-leading innovative products designed to work together as one total system to help every commercial pool perform at its absolute best. Our products set the technological standard while providing unmatched performance, efficiency, reliability, versatility and ease ..., Hawyard H400 Heater "LO" flashing. Thread starter TNorth225; Start date Apr 21, 2009; Jump to latest Follow Reply Forums. Equipment - Build ... I recently bought a house with a in ground pool/hot tub combo that includes a Hayward H400 pool heater. It was a bank owned house where the pool had been sitting without filtering for ..., NJ. Aug 7, 2021. #1. Hello, I have a H150FDN pool heater. It's worked all summer so far, but last week I noticed that it would turn on for a few minutes then turn off and show Lo. The filter is clean and the output is strong. I ordered a new pressure switch, but in the meantime I took the two wires that connect to the switch and made a jumper ..., April 9, 2023 by William. Hayward pool heater IF code basically signifies the ignition failure of your heater system. The major reasons for Hayward pool heater code IF/ignition failure include lower gas supply, clogged filter, and malfunctioning of the gas and plumber valve. Also, a faulty transformer, defective flame sensor, bad igniter, and ..., We have 3 Hayward H150FDN manuals available for free PDF download: Troubleshooting Manual, Service & Installation Manual, Owner's Manual Hayward H150FDN Service & Installation Manual (64 pages) POOL AND SPA/HOT TUB HEATERS, A 30% fill on propane can cause issues with a pool heater, but not the one you are having. Heater manufacturers recommend nothing lower than 50%. At 30% you can get a very ugly flame at the burners. From Hayward: "The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure …, INNOVATION MADE EASY. Hayward Commercial Aquatics offers a full range of industry-leading innovative products designed to work together as one total system to help every commercial pool perform at its absolute best. Our products set the technological standard while providing unmatched performance, efficiency, reliability, versatility and ease ..., Ensure the proper installation of the main circuit board within the heater. Check the short ground and high voltage issue and take steps to prevent it. 5. Circuit Board’s Faulty Fuse. Another factor responsible for displaying the Hayward pool heater ce code is the faulty or blown fuse in the heater’s circuit board., The Hayward pool heater spa mode is designed to maintain a specific “spa-like” temperature in the pool. To use this mode, enable “Spa mode” from the control panel, set the required temperature, and let the pool heater warm the water. Once ready, test the water. This process is a joy to behold for those who want to soak themselves in ..., View and Download Hayward HC Series troubleshooting manual ... The default Max temp set points are 90ºF (Pool) 104ºF (Spa). When setting the max temp lock-out set point, the LEDs & display ... may relate to water flow. Verify the pump is running & adequate water is flowing through heater. “LO” is NORMAL when the pump is turned off or ..., NOTE: the maximum temperature set point is 104° F. 13. Hayward H250FDP | Universal H Series Troubleshooting Guide - Page 14. in bypass mode for external control. Step 1 Step 2 Press the 'MENU ICON' button to place the heater in 'STANDBY' mode. Step 3 Press and hold the minus & plus buttons for 3 seconds., My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the filters - still LO 2. Checked wires at pressure switch for continuity - still LO 3., My Hayward spa heater (installed 2018) is not heating the water and is displaying this LO code. I have read every troubleshooting guide and watched every video I could find. My diagnostics included: 1. Cleaned the filters, even ran the pump without the filters - still LO 2. Checked wires at pressure switch for continuity - still LO 3., Hayward H400FDN Pdf User Manuals. View online or download Hayward H400FDN Owner's Manual, Troubleshooting Manual ... POOL AND SPA/HOT TUB HEATERS. Brand: Hayward | Category: Heater ... LO" Code. 46. Pressure Switch Adjustment. 49. IF" Code. 52. AC" Code. 57. AO" Code. 58. Heat Exchanger: Flow Requirements. 61.