Lochinvar 51 Variable speed pump option, Model Grundfos, UP26-96 FC/VS IFC VS Stratos 1.25 3 x

Installation & Operation Manual

6Hydronic piping (continued)

Variable speed pump option

Table 6B Recommended Variable Speed Pumps

Minimum Temperature Rise*

		Pump
Model
	Grundfos	TACO	Wilo
	UP26-96 FC/VS	0013 IFC VS	Stratos 1.25 3 x 30
51/81	20.3	20.3	21.7
106	22.3	21.0	21.5
151	21.2	19.8	19.1
211	26.8	25.1	23.6

*The minimum temperature rise is derived from the chart in FIG. 6-2 with the firing rate and pump speed at 100% as shown in the table above.

The shaded regions of pump coverage are only available for applications with 230V (60 Hz) supply voltage, all others are to be 115V. (A field supplied relay is required to connect the 230V pump listed in the shaded area in Table 6B to the boiler high voltage terminal strip.)

Variable speed pump setup

Before operation, ensure the following:

-Pump is set for an input signal of 0 - 10Vdc by the dip switches on the pump control

-Pump is set for external signal control (if applicable)

-Pump is set for linear output (if applicable)

-If pump does not come equipped with a 0 - 10 Vdc input option, an optional module will be required from the vendor

NOTICE

NOTICE

Pump sizing and flow requirements are based on 20 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

It is required that near boiler piping systems utilize Primary/Secondary configurations as shown in FIG.’s 6-3 through 6-10 only. The use of other near boiler piping configurations could result in improper building and system flow rates leading to inadvertent boiler high limit shutdowns and poor system performance.

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