Installation / Operation Instruction Manual

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Installation instructions

RTG-K-199/160N/X1 – 6 720 817 984 (2022/06)

4.13 Recirculation with the RTG-K-160/199N/X1

Recirculation with the RTG-K-160/199 models requires the

installation of an external pump.

The RTG-K-160/199 models have the capability of controlling

an external pump by switching power ON and OFF to the

external pump using the recirculation pump cable.

Use only bronze or stainless steel pumps. Do not use pumps of

iron construction as they will oxidize and pose health risks.

Refer to pump manufacturers pressure vs flow specifications to

select a pump that will provide adequate flow through the

recirculation system.

Fig. 32

[1] Cable to control board

[2] Appliance front cover

[3] External recirculation pump (field supplied)

[4] Terminal block

[5] Recirculation pump cable

[6] 5 amp fuse

The flow rate through the recirculation system must be larger

than the activation fl ow rate of the water heater, 0.4 GPM.

A flow rate through the recirculation system greater than 1GPM

is recommended.

4.14 Cascading Operation

Cascading allows up to twenty four appliances to be connected

in parallel. One of the appliances will serve as the controlling

primary appliance and will attempt to meet the hot water

demand. If the hot water demand is beyond the capacity of the

primary appliance, a signal is sent to one or more of the

secondary appliances to ignite. A cascading kit must be

installed for each secondary appliance included in the

installation.

Example: A 7 unit cascade installation includes 1 primary

appliance and 6 secondary appliances. 6 intelligent cascading

kits must be installed for this application.

4.14.1 Plumbing set up

The plumbing should be connected in the reverse return

method with a minimum number of elbows to aid in balancing

pressures between the appliances. Locating the appliances as

close as possible improves performance.

• Follow industry plumbing practices when installing multiple

appliances.

• Minimum pipe diameter: ¾"

• Minimum water pressure: 50 psi

• Maximum distance between appliances: 36"

• Insulate pipes to prevent heat loss

Fig. 33 Cascading installation example

It is not possible to have both cascading and recirculation active

at the same time.

It is not possible to cascade a RTGK with a RTGL.

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