High-Efficiency Commercial Gas Series - Service Manual
Technical Literature Department
1
Ashland City, Tennessee © 2008
Servicing should only be performed by a Qualified Service Agent
INTRODUCTION......................................................................................................................................................................2
QUALIFICATIONS....................................................................................................................................................................2
TOOLS REQUIRED.................................................................................................................................................................3
GENERAL INFORMATION......................................................................................................................................................4
GAS PRESSURE REQUIREMENTS ......................................................................................................................................4
GAS PRESSURES – 120 and 150 KBtu/hr MODELS.............................................................................................................5
GAS VALVE 120 KBtu/hr MODEL............................................................................................................................................6
GAS VALVE 150 KBtu/hr MODEL............................................................................................................................................6
GAS PRESSURES 199 and 250 KBtu/hr MODELS.................................................................................................................7
GAS VALVE 199 and 250 KBtu/hr MODELS...........................................................................................................................8
VENTING TABLES...................................................................................................................................................................9
VENTING - ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR................................................................10
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR...............................................................11
VENT / INTAKE AIR TERMINATIONS...................................................................................................................................12
DIRECT VENT INSTALLATIONS...........................................................................................................................................13
CONTROL OVERVIEW .........................................................................................................................................................14
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT - DIFFERENTIAL..........................................................15
CHANGING THE DISPLAY UNITS........................................................................................................................................16
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION........................................................17
CURRENT FAULT OR WARNING.........................................................................................................................................18
VIEWING THE FAULT HISTORY – WATER HEATER INFORMATION................................................................................19
SEQUENCE OF OPERATION - TEXT...................................................................................................................................20
SEQUENCE OF OPERATION – FLOW CHART...................................................................................................................21
CONTROLS – CENTRAL CONTROL BOARD – CCB ..........................................................................................................22
CONTROLS – PRESSURE SWITCHES................................................................................................................................23
CONTROLS – PRESSURE SWITCHES (cont)......................................................................................................................24
CONTROLS – IGNITER, FLAME SENSOR, SIGHT GLASS, POWERED ANODES............................................................25
MINIMUM IGNITER / FLAME SENSOR CURRENT - CONTROL TIMING............................................................................26
BLOWER SPEED CONTROL 199 AND 250 KBtu/hr MODELS............................................................................................27
WIRING DIAGRAM................................................................................................................................................................28
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