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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 Low 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 Plumbing For Water Connections
21 Flow Rates
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 Heat Exchanger Pressure Drop Tables
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, Low NOx
31 SECTION 4
SERVICING INSTRUCTIONS
31 General Location of Controls
32 Control Panel Removal
32 Control Adjustments - Digital Models
32 Control Adjustments - Millivolt Models
33 Digital Thermostat Controls
33 Thermostat Control Operation
35 Diagnostics
35 Codes
35 Reading a Fault
36 Remote Control Installation and Operation
36 Remote Operation
36 Activating the Remote
37 Remote Control Wiring
37 2-Wire Remote Control
37 3-Wire Remote Control
38 Water Pressure Switch
38 Flame Roll-Out Safety Switch
38 High Limits
38 Pilot Safety
39 Burner Tray Removal (ATM)
39 Gas Valve Removal (ATM)
39 Main Burner and Orifice Removal (ATM)
39 Pilot Removal and Cleaning
39 Heat Exchanger Removal
40 Tube Cleaning Procedure
40 Desooting Procedure
40 Combustion Chamber Removal
40 Immersion Well Replacement
40 Unitherm Governor (U.G.) Replacement
41 Low NOx Pool Heaters
41 Operation
41 Start-Up Procedures
41 Visual Inspection
41 Electrical
41 Flame Roll-Out Safety Switch
42 Burner Tray Removal
42 Gas Valve Removal
42 Main Burner and Orifice Removal
42 Pilot Removal
42 Combustion Blower Removal
43 SECTION 5
TROUBLESHOOTING
44 Electrical - Standing Pilot Millivolt
45 Electrical - Electronic Ignition (IID)
46 Digital Control Logic - Flow Chart
47 SECTION 6
REPLACEMENT PARTS
48 Illustrated Parts List
51 Part Numbers
3
CONTENTS