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First Aquatherm Series - User Manual

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FIRST CO. - P.O. BOX 270969 - DALLAS, TEXAS 75227 - Ph. (214) 388-5751 - Fax (214) 388-2255 - www.firstco.com
INSTALLATION AND APPLICATION MANUAL
FOR
AQUATHERM
®
COMBO HEATERS
Aquatherm
®
®
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Summary

General Description

Air Handler Cabinet

Describes galvanized steel cabinets, insulation, and throwaway filters.

Heating and Cooling Coils

Details copper tubes, aluminum fins, manual air vents, and condensate connections.

Add-On Hot Water Coil

Explains HWC series coils for supplemental heating with existing fan motors.

Circulating Pump

Specifies circulation rate (3-6 GPM) and purpose in heating loops.

Flow Control Module

Describes U.L. Listed device with pump, check valve, and relay for installation flexibility.

Check Valve

Explains its function in preventing thermosyphoning during cooling mode.

Sequence of Operation (Heating Mode)

Heating Cycle Operation

Details how the thermostat activates the pump and fan for home heating.

General Description Components

Air Purge Valve

Describes the manual valve for air removal in the heating loop.

Blower Delay Relay

Explains its function in delaying fan motor start/stop for efficiency.

Flue Gas Safety Switch

Ensures fan motor operation only when blower door is secure.

Water Heater Compatibility

Discusses compatibility with gas/oil heaters and recommendations against electric.

Boiler Compatibility

Mentions compatibility with boilers and instantaneous water heaters.

Accessories

Thermostat Compatibility

Details compatible thermostat types and warnings against gas furnace types.

Freeze Protector

Describes Kit 941-1 for preventing coil freezing in cold spaces.

Equipment Sizing

Condensing Unit Sizing

States the condensing unit should meet calculated heat gain.

Air Handler Sizing

Advises selecting an air handler with heating BTUH exceeding heat loss.

Water Heater Sizing

Recommends adding 10-20% to heat loss and using high-recovery heaters.

Installation

Duct Work Requirements

Specifies return air duct free area must match air handler opening.

Electrical Requirements

Mentions wiring diagrams, nameplate data, and voltage requirements.

Water Piping

General statement about adherence to codes and instructions.

Installation - Water Piping Details

Water Piping Material

Recommends 3/4 inch copper and specifies alternatives.

Solder Connections

Mandates low-temperature, non-lead solder for copper joints.

Piping Insulation

Recommends insulation to prevent freezing and mentions freeze protector.

Piping Length Limitations

States piping should not exceed 200 feet and air handlers not over 40 feet above heater.

Shut-Off Valves

Recommends shut-off valves for air purging and isolation.

Piping Connections

Details water inlet/supply connections and piping to water heater T-fittings.

Air Handler Installation Notes

Warns against drilling into cabinets and discusses multiple air handlers.

Flow Control Module Installation

Guides on module placement, motor orientation, and junction box location.

Water Heater Installation Notes

Refers to manufacturer instructions and discusses T&P valve dripping.

Start-Up Procedure (Heating Cycle)

Initial Shut-Off Valve Check

Instructs to open main water heater valve and air handler/coil shut-off valves.

Filling the Water Heater

Details filling the heater and venting air via a hot water faucet.

Igniting the Water Heater

Instructions for igniting, emphasizing the need for water in the tank.

Purging Air Handler Lines

Step-by-step guide to purge air from the coil and lines using valves.

Venting Grundfos Pump

Describes how to vent air from the pump chamber screw plug.

Setting Thermostat for Heat

Guides on setting the thermostat to energize the fan and pump.

Adjusting Water Heater Thermostat

Instructs to set the water heater thermostat for optimal coil temperature.

Piping Diagrams

Conventional Piping Diagram Explanation

Illustrates a standard piping setup for the system.

Side Tap Piping Diagram Explanation

Shows piping for water heaters with side taps and a note about check valves.

Multiple Water Heater Piping Diagram

Two Water Heaters Piping Diagram Explanation

Illustrates parallel connection with reverse piping for multiple water heaters.

Zone Valves and Wiring

Wiring Schematic for Zone Valves

Shows typical wiring for multiple zone connections using zone valves.

Wiring Schematic with Switching Relay

Details wiring for multiple zones using a Taco SR-504/506 switching relay.

Troubleshooting

Pump Does Not Run

Provides steps for diagnosing and fixing a non-operational pump.

Fan Motor Issues (Cooling vs. Heating)

Addresses fan motor behavior discrepancies between cooling and heating modes.

Noisy Pump

Suggests re-purging the system if the pump is noisy.

Water Heater T&P Valve Weeping

Explains T&P valve weeping, often related to backflow preventers.

Insufficient or No Heat

Lists potential causes from air in loop to undersized components.

Hot Water Circulation During Cooling

Discusses issues like stuck check valves causing unwanted circulation.

Conclusion

Manual Handover and Explanation

Advises leaving literature and explaining the system to the homeowner.

Summary

General Description

Air Handler Cabinet

Describes galvanized steel cabinets, insulation, and throwaway filters.

Heating and Cooling Coils

Details copper tubes, aluminum fins, manual air vents, and condensate connections.

Add-On Hot Water Coil

Explains HWC series coils for supplemental heating with existing fan motors.

Circulating Pump

Specifies circulation rate (3-6 GPM) and purpose in heating loops.

Flow Control Module

Describes U.L. Listed device with pump, check valve, and relay for installation flexibility.

Check Valve

Explains its function in preventing thermosyphoning during cooling mode.

Sequence of Operation (Heating Mode)

Heating Cycle Operation

Details how the thermostat activates the pump and fan for home heating.

General Description Components

Air Purge Valve

Describes the manual valve for air removal in the heating loop.

Blower Delay Relay

Explains its function in delaying fan motor start/stop for efficiency.

Flue Gas Safety Switch

Ensures fan motor operation only when blower door is secure.

Water Heater Compatibility

Discusses compatibility with gas/oil heaters and recommendations against electric.

Boiler Compatibility

Mentions compatibility with boilers and instantaneous water heaters.

Accessories

Thermostat Compatibility

Details compatible thermostat types and warnings against gas furnace types.

Freeze Protector

Describes Kit 941-1 for preventing coil freezing in cold spaces.

Equipment Sizing

Condensing Unit Sizing

States the condensing unit should meet calculated heat gain.

Air Handler Sizing

Advises selecting an air handler with heating BTUH exceeding heat loss.

Water Heater Sizing

Recommends adding 10-20% to heat loss and using high-recovery heaters.

Installation

Duct Work Requirements

Specifies return air duct free area must match air handler opening.

Electrical Requirements

Mentions wiring diagrams, nameplate data, and voltage requirements.

Water Piping

General statement about adherence to codes and instructions.

Installation - Water Piping Details

Water Piping Material

Recommends 3/4 inch copper and specifies alternatives.

Solder Connections

Mandates low-temperature, non-lead solder for copper joints.

Piping Insulation

Recommends insulation to prevent freezing and mentions freeze protector.

Piping Length Limitations

States piping should not exceed 200 feet and air handlers not over 40 feet above heater.

Shut-Off Valves

Recommends shut-off valves for air purging and isolation.

Piping Connections

Details water inlet/supply connections and piping to water heater T-fittings.

Air Handler Installation Notes

Warns against drilling into cabinets and discusses multiple air handlers.

Flow Control Module Installation

Guides on module placement, motor orientation, and junction box location.

Water Heater Installation Notes

Refers to manufacturer instructions and discusses T&P valve dripping.

Start-Up Procedure (Heating Cycle)

Initial Shut-Off Valve Check

Instructs to open main water heater valve and air handler/coil shut-off valves.

Filling the Water Heater

Details filling the heater and venting air via a hot water faucet.

Igniting the Water Heater

Instructions for igniting, emphasizing the need for water in the tank.

Purging Air Handler Lines

Step-by-step guide to purge air from the coil and lines using valves.

Venting Grundfos Pump

Describes how to vent air from the pump chamber screw plug.

Setting Thermostat for Heat

Guides on setting the thermostat to energize the fan and pump.

Adjusting Water Heater Thermostat

Instructs to set the water heater thermostat for optimal coil temperature.

Piping Diagrams

Conventional Piping Diagram Explanation

Illustrates a standard piping setup for the system.

Side Tap Piping Diagram Explanation

Shows piping for water heaters with side taps and a note about check valves.

Multiple Water Heater Piping Diagram

Two Water Heaters Piping Diagram Explanation

Illustrates parallel connection with reverse piping for multiple water heaters.

Zone Valves and Wiring

Wiring Schematic for Zone Valves

Shows typical wiring for multiple zone connections using zone valves.

Wiring Schematic with Switching Relay

Details wiring for multiple zones using a Taco SR-504/506 switching relay.

Troubleshooting

Pump Does Not Run

Provides steps for diagnosing and fixing a non-operational pump.

Fan Motor Issues (Cooling vs. Heating)

Addresses fan motor behavior discrepancies between cooling and heating modes.

Noisy Pump

Suggests re-purging the system if the pump is noisy.

Water Heater T&P Valve Weeping

Explains T&P valve weeping, often related to backflow preventers.

Insufficient or No Heat

Lists potential causes from air in loop to undersized components.

Hot Water Circulation During Cooling

Discusses issues like stuck check valves causing unwanted circulation.

Conclusion

Manual Handover and Explanation

Advises leaving literature and explaining the system to the homeowner.

First Aquatherm Series Specifications

General IconGeneral
BrandFirst
ModelAquatherm Series
CategoryAir Handlers
LanguageEnglish