Plumbing - 5100 Series

THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN.

The Comfort Plus Hydronic heating system MUST be plumbed with a primary loop and secondary (zone) loops.* The primary loop needs to consist of a minimum of 10’ of 1” pipe rated for 250°F/121°C and requires its own pump (circulator). The secondary (zone) loops require additional pump(s) to operate effectively. Refer to Typical Primary Loop (Figure 16) and the Typical System Plumbing Diagrams (Figures 17 and 18) for installation information.

The primary loop serves to regulate heat transfer from the system’s heat exchanger. The primary loop pump must be powered by the red and white pump control wires as shown in Figure 17-18. At the end of a heat call, water must be able to flow through the exchanger and the primary loop to dissipate heat until the core blower comes to a complete stop. The primary loop is not generally insulated for this reason.

*Exception: In applications where there is a single heating loop and the primary loop pump can continue to circulate water when there is no call for heat, the entire heating loop system may be considered the primary loop and no other pumps/loops are needed.

CAUTION

FREEZE PROTECTION: Risk of frozen pipes. Can cause property damage. Hydronic heating system freeze-ups WILL cause extensive damage to the entire heating system and/or property. It is the responsibility of the installer to provide protection against freezing.

PIPING SUPPORT: Risk of exchanger damage. Can cause property damage or personal injury. DO NOT use the exchanger as support for piping. Support brackets should be in place to ensure proper operation of the system and to keep pressure off the inlet and outlet piping.

It is the responsibility of the installer to prevent involuntary flow of water to the air handler. Not doing so may cause limit tripping and/or decrease heat pump efficiency. Use of a check valve, zone valve, or other device may help prevent involuntary flow.

Figure 16 - Typical Primary Loop

Primary Loop Kit Installed

picture of typical system plumbing with one temperature

Figure 17 - Single Temperature Plumbing

picture of typical system plumbing with an air handler

Figure 18 - Plumbing With Air Handler

PUMP SPECIFICATIONS

Steffes recommends a Taco 007 or equivalent single speed 115VAC pump for the primary pump.
Air Handler pump should NOT be a split phase pump.
Air Handler pump should NOT have any type of auxiliary control built into or onto the pump.

Plumbing - 5100 Series

CAUTION

PUMP SPECIFICATIONS

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