Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Safety Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Combustion/Ventilation Air Requirements . . . . . . . . . .4
Venting - General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Conventional Venting . . . . . . . . . . . . . . . . . . . . . . . . . . .8
E+Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Direct Vent Sidewall . . . . . . . . . . . . . . . . . . . . . . . . . .14
Direct Vent Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Outdoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . .22
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Gas Pressure & Piping . . . . . . . . . . . . . . . . . . . . . . . . .24
Manifold Pressure Adjustment . . . . . . . . . . . . . . . . . . .26
Supply Pressure Measurement . . . . . . . . . . . . . . . . . . .28
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . .30
Temperature Adjustment . . . . . . . . . . . . . . . . . . . . . . .30
Outdoor Air Reset Option . . . . . . . . . . . . . . . . . . . . . .32
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . .34
Hot Surface Ignition Control . . . . . . . . . . . . . . . . . . . .35
Operation & Diagnostic Lights . . . . . . . . . . . . . . . . . .35
Ignition & Control Timings . . . . . . . . . . . . . . . . . . . . .35
Freeze Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Flame Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Combustion Air Adjustments . . . . . . . . . . . . . . . . . . . .37
Burner Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Heat Exchanger Inspection . . . . . . . . . . . . . . . . . . . . .39
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Gas Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Heating Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Typical Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Pump Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Pressure Drop Curve . . . . . . . . . . . . . . . . . . . . . . . . . .41
Boiler Pump Operation . . . . . . . . . . . . . . . . . . . . . . . .41
Bypass Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .41
Low Temperature Systems . . . . . . . . . . . . . . . . . . . . . .42
Boiler Flow Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Temperature Rise Chart . . . . . . . . . . . . . . . . . . . . . . . .43
Placing Boiler in Operation . . . . . . . . . . . . . . . . . . . . .44
Boiler Temperature Control . . . . . . . . . . . . . . . . . . . . .45
Remote Thermostat Connection . . . . . . . . . . . . . . . . . .45
Domestic Water Heater . . . . . . . . . . . . . . . . . . . . . . .46
Water Velocity Control . . . . . . . . . . . . . . . . . . . . . . . . .46
Water Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Piping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .47
Pump Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Thermostat Adjustment . . . . . . . . . . . . . . . . . . . . . . . .48
Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Troubleshooting Charts . . . . . . . . . . . . . . . . . . . . . . . .54
Revision Notes . . . . . . . . . . . . . . . . . . . . . . .Back Cover
The information contained in this manual is
in tend ed for use by qualified professional in stall ers,
service technicians or gas suppliers. Con sult your local
expert for proper installation or service procedures.
CONTENTS
2
USER WARNING
Consult and follow local Building and Fire
Regulations and other Safety Codes that apply to
this installation. Consult your local gas utility
company to authorize and inspect all gas and flue
connections.
Should overheating occur or the gas supply fail to
shut off, do not turn off or disconnect the electrical
supply to the pump. Instead, shut off the gas supply
at a location external to the appliance.
To minimize the possibility of serious personal
injury, fire or damage to your appliance, never
violate the following safety rules.
1. Boilers and water heaters are heat producing
appliances. To avoid damage or injury, do not store
materials against the appliance or the vent-air
intake system. Use proper care to avoid
unnecessary contact (especially children) with the
appliance and vent-air intake components.
2. Never cover your appliance, lean anything against
it, store trash or debris near it, stand on it or in any
way block the flow of fresh air to your ap pli ance.
3. UNDER NO CIRCUMSTANCES must flammable
materials such as gasoline or paint thinner be used
or stored in the vicinity of this appliance, vent-air
intake system or any location from which fumes
could reach the appliance or vent-air intake system.
WARNING
WARNING
IMPORTANT
Your conventionally vented gas appliance must have a
supply of fresh air circulating around it during burner
operation for proper gas combustion and proper
venting.
IMPORTANT