Residential Heat Pump Aerotherm Re Series Heat Pump Water Heater User Manual

• Follow the recommended installation checklist:

1. Verify Air Filter is installed.
2. Ensure proper plumbing connections are in place, including a
   rigid drain line directed to a drain or condensate pump.
3. Check that the Temperature & pressure relief valve is
   working and the drain line is completed per local code.
4. Verify the electrical connection, ensuring 208/240 VAC to L1
   and L2 at the tank.
5. Make sure the electrical connection does not prevent air filter
   removal.

• Once the tank is full and power is energized, the following
  actions occur:

1. 0 to 2 minutes: The unit goes through a self-check and displays
   a countdown to prevent compressor damage.
2. 2 to 22 minutes: The compressor and fan turn on to ensure the
   tank is full of water (Dry-fire prevention algorithm).
3. 22 minutes and beyond: The compressor and fan turn off, and the
   heating elements turn on. After initial heat-up, the elements turn
   off, and the compressor turns on. The water heater operates in
   Hybrid mode, providing an initial amount of hot water before
   switching to the efficient heat pump for the majority of
   heating.

Attention Installer

Recommended clearances:

It is recommended to have a 7″ (17.8 cm) clearance between any

object and the rear and sides of the water heater in the event

service is needed. A minimum 8″ (20.3cm) clearance above the

water heater to remove the filter for cleaning and for service

access, and clear access to the front of the water heater, is

recommended. Installations that require less than 7″ (17.8 cm)

clearance on the right

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straps are section in

side also

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the Installation and Operations Manual for

more information) In these cases, additional clearance must be

provided on the opposite side of the unit to allow for service

access. The hot and cold water plumbing and electrical

connections must not interfere with the removal of the filter.

If a separate ducting kit is purchased, additional space is required above and to the rear of the water heater for installation. Consult the ducting kit manual for specific instructions.

8″ (20.3 cm)

7″ (17.8 cm)

Model appearance may vary.

TYPICAL INSTALLATION

Conduit to electrical junction box (use only copper conductors)

Thermal expansion tank
To cold water supply

Hot water outlet to fixtures
Union (suggested)

Shut-off valve

¾” FNPT fitting to condensate drain pan

Temperature & pressure relief valve

Drain valve

Condensate drain line

To open drain, line should be at least 3/4″ ID and pitched for proper draining

Relief valve discharge 6″ (15.2 cm) minimum from the floor

Room size:
Because this unit draws in air from the room to heat the water, the room must be at least 10′ x 10′ x 7′ (700ft³) [3.05m x 3.05m x 2.13m (19.82m³)] or larger. If the room is smaller there must be a louvered door or a ducting kit installed.
Protect Unit:
During installation cover and protect upper part of the unit from potential installation debris.

Installation Checklist:

1. Tank location: ­ Does room size require louvered door, ducting, or similar ventilation? 10′ x 10′ x 7′ (700 cu. ft.) or 240 square inches (0.15 m2) open air-flow area needed. ­ Back of unit away from wall by 7 inches (17.5 cm), and sides have at least 7 inches (17.5 cm) clearance. (Additional clearance for earthquake strap installations). ­ Front of unit is free and clear. ­ Is the water heater level? If no, add shims under the base of the unit to ensure proper function of sensors.
2. Verify Air Filter is installed. (Located in packaging).

3. Plumbing connections:

­ Does not prevent air filter removal.

­ No leaks after filling the tank with water, either when water is

flowing or not.

4.

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are in place: rigid drain line

installed

and

directed

to

a

drain

or condensate pump. Reducer fittings are not recommended.

5. Temperature and pressure-relief valve is working and drain line

completed per local code.

6. Electrical: Verify 208/240 VAC to L1 and L2 at tank.

7. Electrical connection does not prevent air filter removal.

8. Verify control panel displays 120°F (49°C) Hybrid mode. Assist user in how to adjust temperature and modes (see “Temperature Adjustment” section of the Installation and Operation Manual).

Normal Startup Conditions:
Once the tank is full and power is energized, you may experience the following:

Elapsed Time
0 to 2 minutes

HEWH Actions
Unit will go through self-check and display countdown.

Comments This 2-minute off-time prevents compressor damage.

2 to 22 Compressor and fan minutes turn on.

This 20-minute period is used to ensure the tank is full of water (Dry-fire prevention algorithm).

22 minutes and beyond

Compressor and fan turn off, heating elements turn on. After initial heat-up, elements turn off and compressor turns on.

The water heater is operating in Hybrid mode, quickly providing an initial amount of hot water before switching to the efficient heat pump for the majority of heating.

NOTE: Heat Pump operating range is 35°F – 120°F (2°C-49°C).

238-52325-00B 06/22
Printed in USA