4 PART ONE
OWNER'S OPERATING INSTRUCTIONS
4 SECTION 1
START-UP PROCEDURES
4 Before Start-Up
5 Lighting Instructions & Shut-Off Procedures -
Manually Lighted Pilots MV
6
Operating Instruction & Shut-Off Procedures -
Automatically Lighted Pilots IID
7 After Start-Up
7 SECTION 2
CAUTION
8 SECTION 3
MAINTENANCE & CARE PROCEDURES
8 Pool & Spa Water Chemistry
8 Automatic Chlorinators & Chemical Feeders
9 Cold Weather Operation
9 Winterizing the Pool & Spa Heater
10 PART TWO
INSTALLATION & SERVICE INSTRUCTIONS
10 SECTION 1
RECEIVING EQUIPMENT
11 SECTION 2
GENERAL SPECIFICATIONS
11 SECTION 3
INSTALLATION INSTRUCTIONS
11 Code Requirements
12 Clearances
12 Outdoor Heater Installation
14 Florida Building Code 2001
15 Indoor Heater Installation
15 Outdoor Stack/Indoor Stack
16 Atmospheric Specifications and Dimensions
17 Lo NOx Specifications and Dimensions
18 Combustion and Ventilation Air
18 Vent Piping
19 Gas Supply Connections
20 Gas Pressure Regulator
20 Gas Pressure Adjustment Locations
20 Pipe Sizing For Gas Connections
21 Flow Rates
21 Heat Exchanger Pressure Drop Tables
22 Polymer Headers
22 Cast Iron Headers
22 Unitherm Governor Operation
23 Internal Automatic Bypass Valve
23 External Auxiliary Bypass Valve
23 Auxiliary Bypass Valve Adjustment
23 Pressure Relief Valve Installation
24 Plumbing—Water Connections
25 Heat Exchanger Reversal Procedure
26 Electrical Wiring
26 Millivolt Models
26 Digital Models
27 Transformer Wiring
28 Wiring Diagram - Millivolt (Mechanical Therm.)
29 Wiring Diagram - Digital Models, Atmospheric
30 Wiring Diagram - Digital Models, Lo NOx
31 SECTION 4
SERVICING INSTRUCTIONS
31 General Location of Controls
32 Control Panel Removal
32 Control Adjustments - Digital and AFT Models
32 Control Adjustments - Millivolt Models
33 Thermostat Operation - Digital Board
3
5 Diagnostics
35 Codes
35 Reading a Fault
36 Remote Control Installation and Operation
36 Remote Operation
36 Activating the Remote
37 Thermostat Operation - AFT Board
39 Status and Diagnostics
40 Remote Control Installation and Operation
40 Remote Operation
40 Activating the Remote
41 Remote Control Wiring
41 2-Wire Remote Control
41 3-Wire Remote Control
42 Time Clock / Fireman’s Switch
42 Water Pressure Switch
42 Flame Roll-Out Safety Switch
42 High Limits
43 Pilot Safety
43 Burner Tray Removal (ATM)
43 Gas Valve Removal (ATM)
43 Main Burner and Orifice Removal (ATM)
43 Pilot Removal and Cleaning
44 Heat Exchanger Removal
44 Tube Cleaning Procedure
44 Desooting Procedure
44 Combustion Chamber Removal
44 Immersion Well Replacement
45 Unitherm Governor (U.G.) Replacement
45 Lo NOx Pool Heaters
45 Operation
45 Start-Up Procedures
45 Visual Inspection
45 Electrical
45 Flame Roll-Out Safety Switch
46 Burner Tray Removal
46 Gas Valve Removal
46 Main Burner and Orifice Removal
46 Pilot Removal
46 Combustion Blower Removal
47 SECTION 5
TROUBLESHOOTING
48 Electrical - Standing Pilot Millivolt
49 Electrical - Electronic Ignition (IID)
50 Digital/AFT Control Logic - Flow Chart
51 SECTION 6
REPLACEMENT PARTS
52 Illustrated Parts List
55 Part Numbers
3
CONTENTS
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