UGT Series Manual
27
Recirculation Mode
This water heater has the ability to control a
recirculation pump. Two modes are available,
Economy and Comfort, which recirculate the water in
the plumbing system to provide hot water more
quickly when a tap is opened.
Recirculation mode is for residential installations only.
Recirculation mode cannot be used with the an air
handler or with multiple water heaters.
The maximum water heater temperature setting
while in recirculation mode is 140°F (60°C).
Pump Requirements
Voltage:
120V, 60 Hz
Amperage:
less than 2 amps
NOTE: The PC board will be damaged if
amperage exceeds 2 Amps.
In-rush current: Less than 2.5 Amps.
Check valve: An integral flow check (IFC) valve is
required. See plumbing diagram.
Pump Size
The pump should be sized for 2.5 GPM at the pressure
loss through the tankless water heater and the supply
and return plumbing in the recirculation loop.
Installation
1. Turn off the electrical power supply by unplugging
the power cord or by turning off the electricity at
the circuit breaker.
2.
Install the recirculation pump on the return line
according to the pump manufacturer installation
instructions. Install a check valve in the return
line as shown in the Plumbing Diagram if one is
not integrated into the pump.
3.
The wire harness for the recirculation pump is
bundled with the wire harness from the PC board.
The connector has a black and white wire with the
label “Cut wire to connect to pump”. To connect
to the pump, cut the connector, splice the wires,
and add 4 Amp fuse to the hot wire (black) of the
pump. Connect the ground wire from the pump
to a screw at the base of the water cabinet .
Refer to the Pump Electrical Connection Diagram.
Follow Electrical Code and pump manufacturers
recommendations.
4. Adjust the dip switch by moving the 4th switch in
the whie set of switches (SW2) to ON.
For Economy mode, set the 8th switch in the
white set of switches (SW2) to OFF (default).
For Comfort mode, set the 8th switch in the white
set of switches (SW2) to ON.
5. Connect power to the water heater. Press the
Power button on the controller. The pump and
water heater will turn on to raise the recirculation
loop temperature.
Settings for SW2
(bank of white switches)
Switch 4
Switch 8
Economy Mode
ON
OFF
Comfort Mode
ON
ON
Cut connector
and splice wires.
PC
Board
Pump Electrical Connection
4 Amp
Fuse
BL
W
Plumbing Diagram
