Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Commercial Pool Heaters

Commercial Pool Heaters

Table of Contents
General Product Information	. . .3
Special Instructions	. . .3
Unpacking	. . .3
Codes	. . .3
Warranty	. . .3
Safety Information	. . .3
Product Identification	. . .5
Installation	. . .6
Locating Pool Heater	. . .6
Clearances from Combustible Construction	. . .6
Base for Combustible Floors	. . .6
Freeze Protection	. . .7
Combustion and Ventilation Air	. . .7
Combustion Air Filter	. . .7
Combustion Air Options	. . .8
Exhaust Fans	. . .9
Venting	. .10
General Information	. .10
Venting Support	. .10
Vertical Vent Termination Clearances and Location	. .10
Sidewall Vent Termination Clearances and Location	. .11
Combustion Air Inlet Piping	. .12
Length of Air Inlet Piping	. .12
Sidewall Air Inlet	. .12
Vertical Rooftop Air Inlet	. .13
Combined Air Inlet Points	. .13
Vent System Options	. .14
Barometric Damper Location	. .14
1. Conventional Negative Draft Venting	. .14
2. Vertical DirectAire™ Venting	. .16
3. Sidewall Venting	. .17
4. Horizontal DirectAire™ Venting	. .20
5. Direct Venting	. .21
6. Outdoor Installation Venting	. .25
Connecting to Gas Supply	. .26
Gas Pressure Test	. .26
Gas Piping	. .27
Connecting Gas Piping to the Pool Heater	. .27
Gas Train and Controls	. .27
Combination Gas Valves	. .28
Venting of Combination Gas Valves	. .28
Checking Gas Supply Pressure	. .28
Gas Manifold Pressure Adjustment	. .30
Pool Heater Piping Installation	. .31
Auxiliary Mixed Water Limit Control	. .31
Pumped Bypass	. .31
Outdoor Operation - Outdoor 3-Way Valve Cover . .	. .31
Manual Operation of the 3-Way Valve Actuator . . . . .32

Table of Contents

Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Water Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Pump Purge Delay Option . . . . . . . . . . . . . . . . . . . . . .36 Service Indicator Option . . . . . . . . . . . . . . . . . . . . . . . .36 Connecting to Electrical Supply . . . . . . . . . . . . . . . . . . . . .36 3-Way Valve Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Terminal Strip Connection Options . . . . . . . . . . . . . . .37 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . .38 To Turn Off Gas To Pool Heater . . . . . . . . . . . . . . . . . .39 Pre-Start Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 Starting the Filter System . . . . . . . . . . . . . . . . . . . . . . .39 Operating Temperature Control . . . . . . . . . . . . . . . . . .40 Programming Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .41 Error Messages -- Temperature Control . . . . . . . . . . . .41

Hot Surface Ignition System . . . . . . . . . . . . . . . . . . . . . . . .42 Operation and Diagnostic Lights . . . . . . . . . . . . . . . . . . . . .43 Water Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 Pipe Size Requirements . . . . . . . . . . . . . . . . . . . . . . . .46 Circulating Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 Minimum Pump Performance . . . . . . . . . . . . . . . . . . . .46 Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 High Water Temperature Limit Control . . . . . . . . . . . .47

Cleaning and Maintenance	.47
Heat Exchanger Cleaning	.48
Combustion and Ventilation Air	.48
Adjusting Differential Air Pressure	.49
Set-Up Procedure	.49
Adjustment Procedure	.50
Servicing Hot Surface Igniter and Ignition Module	.50
Ignition System Checkout	.50
Energy Saving Recommendations	.51
Sequence of Operation	.51
Glossary	.52
Wiring Box Connections	.54
Ladder Diagram	.56
Control Box Connections	.57
Appendix A_Unit Start Up Checklist	.58
Appendix B_Adjust Menu Settings for Operating Modes	.59 . . .
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