Lochinvar 1.5, 1.3 6Parameters continued, Changeable parameters, Set 1 System setup

6Parameters (continued)

Changeable parameters

The following is a brief discussion of the changeable parameters, their default settings, the range of adjustment, and their location. The title for the parameters may differ slightly from the PC to the boiler display. To prevent confusion, the boiler display version will be listed in parenthesis.

Set 1: System setup

Set 1 is accessed by clicking on Parameters at the top of the Main Screen window (FIG. 6-1), then on Set 1: Control Setup on the pull-down menu.

Ramp delay settings

When active, the ramp delay limits the boiler firing rate when a SH cycle has started *. There are 6 limiting steps used to limit temperature overshoot and short cycles (see FIG. 6-2). This feature can be turned on or off depending on the installation. The default condition for this feature is disabled. It should only be needed when the flow through the heat exchanger is very low, or the flow in the primary loop can be less than the flow in the secondary loop. The time for each of the 6 ramp delays as well as the power level for each of the 6 ramp delays are adjustable. The time range for each ramp delay is adjustable from 1 minute to 40 minutes with the total of all 6 ramp delays not to exceed 109 minutes. The default delay time for Periods 1, 2, and 3 is 2 minutes. The default delay time for Periods 4, 5, and 6 is 1 minute. This process can also work in reverse when the boiler shuts off. After shutting off, the max firing rate will be limited to the ramp 6 limit for the period 6 time delay, then to the ramp 5 limit for the period 5 time delay, and so forth. This step down feature overrides the step up feature until the ramp up limit becomes higher than the ramp down limit. To access the Ramp Delay settings, click on the tab labeled 1D Ramp Delay (see FIG. 6-2).

PC Program Instructions

Figure 6-2Parameter Set 1D

The power range for each ramp delay is adjustable from 0 to

100.The defaults for each ramp delay is ramp delay 1= 20%, ramp delay 2=30%, ramp delay 3=40%, ramp delay 4=55%, ramp delay 5=75%, ramp delay 6=100% (FIG. 6-3). Note that the limit in period 6 will limit the firing rate throughout the entire call for heat. The locations for these parameters are 1DG through 1DL. See parameter 4FE (page 17 of this manual) to enable or disable the ramp delay feature.

Figure 6-3Ramp Delay Interval

*This is recommended for single-boiler installations only. 11