Lochinvar 497 - 2067 Required temperature rise, Pipe size requirements, Water chemistry

Page 53

Installation & Service Manual

7 Domestic water heaters (continued)

Required temperature rise

Circulating pump

Based on heating potable water with a hardness of 5 to 25 grains per gallon and/or total dissolved solids not exceeding 350 ppm, see Water Chemistry, this page.

1.The water heater must be connected to a properly sized pump that circulates water between the heater and storage tank.

Water chemistry

The required temperature rise and the standard pump sizing are based on the heating of potable water with a hardness of 5 to 25 grains per gallon and a total dissolved solids not exceeding 350 ppm. Consult the appliance manufacturer when heating potable water exceeding these specifications.

Heating of high hardness and/or high total dissolved solids water will require a larger circulating pump, an optional cupro-nickel heat exchanger and a revised temperature rise specification based on the water chemistry of the water to be heated.

Water with a hardness of less than 5 grains per gallon will usually have a low pH which can be aggressive and corrosive causing non-warrantable damage to the heater, pump and associated piping. Corrosion due to water chemistry generally shows up first in the hot water system because heated water increases the rate of corrosive chemical reactions.

Pipe size requirements

Table 7B, pipe sizing chart provides the minimum pipe size for common manifold piping to ensure adequate flow.

TABLE 7C

Pipe Sizing Chart

497 - 747

987 - 2067

 

 

 

 

Number of

Common Pipe

Number of

Common Pipe

Units

Size (Min.)

Units

Size (Min.)

 

 

 

 

1

2''

1

2 1/2''

2

3''

2

4''

3

3''

3

4''

4

4''

4

5''

5

5''

5

6''

6

5''

6

6''

2.The pump is sized to heater input and water hardness. Care should be taken to size the pump correctly. See Water Chemistry, this page.

3.The water heater is equipped with a factory-supplied pump delay system in accordance with the requirements of the latest edition of ASHRAE 90.1.

4.Lubricate the pump to the manufacturer’s recommendations. Pump damage due to inadequate lubrication is non-warrantable.

5.Standard water heaters are furnished with the following circulating pump. Mount the pump on the unit’s inlet water connection.

Models 497 - 747

1/4 HP, 120 VAC, 5.8 Amps

Models 987 - 2067

1/2 HP, 120 VAC, 7.4 Amps

This pump is sized based on installation of a single storage tank and heater in close proximity. If the number of fittings and straight pipe exceeds the quantities shown in this section, a larger pump will be required.

The standard pump selection is based on the following pipe and fittings from the unit to the storage tank:

•

6

90° elbows

•

2

ball valves

•

2

unions

•

1

cold water tee

•No more than 45 feet of straight pipe.

NOTICE

For every elbow and tee in excess of those shown

above, deduct 5 feet from maximum allowable

 

straight pipe in heater to tank circulating loop.

53

Page 52 Page 54
Image 53
Page 52 Page 54
Contents Save this manual for future reference What to do if YOU Smell GASContents Please read before proceeding WarrantySpecial instructions Checking equipmentOwner warning Safety informationPrevention of freezing CodesCopper-fin How it works Copper-fin How it works Models 987 2067 Front View Models 987 2067 Rear View Copper-fin =B=R Rating RatingsCopper-fin Specifications Determine unit location InstallationLocating the unit Indoor clearances from combustible constructionShut-down and draining Outdoor boiler installationFreeze protection Pump operationCombustion and Ventilation Air Freeze Protection for a Heating Boiler System if requiredMinimum Recommended Combustion AIR Supply to Equipment Room NumberCombustion air filter 3Combustion air filter Models 497Outside Combustion Air, No Ducts Outside Combustion Air, Using DuctsCombustion Air Options Combustion Air from an Interior Space Exhaust FansGeneral information VentingVenting support Vertical vent termination clearances and locationFlue Pipe Sizes Model Flue Size Vent system optionsBarometric damper location Negative draft Conventional negative draft ventingFlue outlet piping Common venting systemsInspection of a masonry chimney Masonry chimney installationOutdoor vent/air inlet location Outdoor installation ventingOutdoor Vent Kits Model Pump Cover Without Pump Cover Outdoor vent kitGas connections Connecting to gas supply Gas pipingGas pressure test Inlet GAS Pressure Natural ModelGas connection Suggested GAS Pipe Size for Single Unit InstallationsGas train and controls Fittings to Equivalent Straight PipeCombination gas valves GAS Piping Size ChartVenting of combination gas valves Checking gas supply pressure3Measuring gas supply pressure at combination gas valve Gas manifold pressure adjustmentNat. Gas 4Measuring manifold gas pressureWater connections Boiler circulator requirements Pressure Drop ChartWater connections heating boilers only Run Cycle Output Minimum System Load Temp. Rise 8.33 60 Min Minimum boiler water temperaturesLow system water volume System Temperature Rise Chart Low temperature return water systemsRadiant floor and snow melt heating systems LTV Valve Kits Model LTV Valve KITGPM Common Manifold Size Min Models 497 Number of UnitsDiameter Common Manifold Size Min Models 987 Number of Units6Primary/secondary piping of multiple boilers 7Boiler with low temperature bypass 8Primary/secondary piping with buffer tank Typical heating boiler installations Installation with a chilled water systemBoiler flow rate General plumbing rulesBoiler bypass requirements Temperature / pressure gaugeFilling the system Water treatmentElectrical connections Connecting to electrical supplyAMP Draw Data VACTerminal strip connection options BurnersLocating the temperature control Temperature adjustmentTemperature control settings OJ1 OJ2Outdoor reset option Remote sensor for pump delay Temperature control sensorsPlacement of sensors Boiler applicationHot surface ignition system Remote Wire Connection Wire Gauge Max. Allowable LengthRemote mounting of a sensor Hot surface igniter and ignition control moduleIgnition and control timings Diagnostic Status IndicationSequence Constant Ignition Operation and diagnostic lightsStage 2 on SixOFF StartupCheck/control water chemistry Freeze protection when usedFill and test water system Purge air from water systemCheck thermostat circuits Check for gas leaksCheck vent and air piping Start the boilerWater velocity control Domestic water heatersInitial set-up of maximum water flow Maximum Water Flow1Typical water heater piping with storage tank 2Single water heater piping with two storage tanks Models 497 Number of Units Common Manifold Size Min4Multiple water heater piping with multiple storage tanks Pipe Sizing Chart 497 987 Required temperature risePipe size requirements Water chemistryDomestic water temperature Potable hot water temperature control settingsMinimum pump performance Heat exchangerLocation of cold water supply piping connections Optional relief valve High water temperature limit controlThermal expansion Cathodic protectionMaintenance Combustion and ventilation air Adjustment procedure Models 497 Servicing a hot surface igniter and ignition module Sequence of operationIgnition system checkout OverviewEnd of sequence Heat transfer processGlossary Trial for Ignition Ignition Module Function Pump Delay Electronic Thermostat FunctionIgniter Controlled by Ignition Module Hi-Lo Fire RelayLadder diagram DiagramsDiagrams Connection diagram Connection diagram

497 - 2067 specifications

Lochinvar 497 - 2067 is a highly efficient and versatile condensing boiler that is designed to meet the diverse heating needs of residential and commercial applications. Known for its impressive performance and advanced technology, the Lochinvar 497 - 2067 has garnered a reputation as a reliable choice among heating professionals.

One of the standout features of the Lochinvar 497 - 2067 is its impressive thermal efficiency. The boiler boasts an efficiency rating of up to 95% AFUE (Annual Fuel Utilization Efficiency), allowing users to significantly reduce their energy costs while minimizing environmental impact. This efficiency is facilitated by its innovative condensing technology, which captures and reuses heat from exhaust gases for optimal performance.

The Lochinvar 497 - 2067 is equipped with a robust stainless steel heat exchanger designed to handle high temperatures and ensure long-lasting performance. The heat exchanger’s design maximizes heat transfer, while its corrosion-resistant properties guarantee durability over time. This contributes to the boiler's overall longevity and serviceability, reducing the need for frequent replacements.

Control is another critical feature of the Lochinvar 497 - 2067. The boiler comes with an advanced control system that enables easy management of system operations. Users can take advantage of features such as outdoor reset control, which adjusts the temperature of the boiler based on external weather conditions, enhancing system efficiency and comfort.

In terms of safety, the Lochinvar 497 - 2067 incorporates several cutting-edge safety features, including a flame detection system and multiple safety shut-off devices. These safeguards help to ensure the safe operation of the boiler, providing peace of mind to users and heating professionals alike.

Another important characteristic is the compact design of the Lochinvar 497 - 2067, which allows for flexible installation in various settings, including tight spaces. Its lightweight structure further simplifies the installation process, making it a practical choice for contractors.

In summary, the Lochinvar 497 - 2067 is an exceptional high-efficiency condensing boiler that combines advanced technology, durability, and ease of use. With its impressive thermal efficiency, superior heat exchanger design, advanced control systems, and enhanced safety measures, it stands out as a top choice for those seeking reliable heating solutions. This boiler not only meets but exceeds modern demands for energy efficiency and performance, solidifying its position in the market.
Top Page Image Contents