Tank differential temp

PC Program Instructions

6Parameters (continued)

Tank differential temp

This parameter determines how far below the tank setpoint the tank sensor temperature must go to start a HW call for heat. This setting can be adjusted by accessing parameter 4AT. The temperature range is 0°F (0°C) to 100°F (38°C). The default value is 5°F (3.5°C).

Time to switch between HW and SH (SH/HW sw tim)

This feature sets the length of time the control will stay in HW mode when a SH call has been received. After this time period has expired the control will determine if a SH call needs to be serviced. If the System Supply Temperature is below the turn-on temperature, the control will revert to SH mode. Otherwise, it will remain in HW mode until the System Supply Temperature drops below the turn-on temperature. If a HW call is still active the timer will reset. After the time period has expired the control will revert to HW mode. This will continue back and forth until one of the demands has been satisfied. This parameter can be changed by accessing parameter 4AU. The time range of this parameter is 10 minutes to 240 minutes. The default value is 30 minutes.

Boost function time (Boost Tim)

This function will only work if the outdoor air sensor is connected. The Boost Function Time sets the amount of time that must elapse during an SH demand before the water temperature setpoint will be increased. This parameter can be changed by accessing parameter 4AV. The time range for this parameter is 1 minute to 60 minutes. The default value is 20 minutes.

Boost function temp increase (Boost incr)

This function will only work if the outdoor air sensor is connected. If a SH demand lasts longer than the programmed time setting in parameter 4AV, and there have been no HW demands, the control will increase the water temperature setpoint by the amount in this parameter. If the SH demand continues through another time period, the setpoint will be increased again. This will continue until either the SH demand ends, a maximum of 20 increases has occurred, or the maximum user setpoint has been reached. Once the SH demand has been satisfied the setpoint will revert back to its calculated setting. The boost temperature can be changed by accessing parameter 4AW. The temperature range of this parameter is 0°F to 45°F(25°C). The default value is 0°. This feature will be active if this parameter is set to anything other than 0°F.

Outlet setpoint temp for indirect HW (Indir HW Setp)

When a HW call for heat becomes active, the control will control the firing rate of the boiler in order to maintain the outlet water temperature at this setpoint. This parameter can be changed by accessing parameter 4AX. The temperature range of this parameter is 50°F (10°C) to 190°F (88°C). The default value is 180°F (82°C).

Cascade max SH step power based (Max outl temp)

When a system supply sensor is connected, each burner applies this setpoint to its outlet sensor during a space heating call for heat. The controls limit the modulation of each burner in order to maintain the system supply temperature at the setpoint. If an outlet temperature approaches this setting, the controls will also limit the modulation of that burner in order to not exceed the setting. The control uses parameters 4AD and 4AE to turn the burner off and back on based on this setting as well. This parameter can be changed by accessing parameter 4AY. The temperature range of this parameter is 32°F (0°C) to 212°F (100°C). The default value is 185°F (85°C).

Cascade DHW setpoint offset for all members

Not used.

On the tabs at the top of the window (FIG. 6-7), click on the tab labeled 4C Boiler Config to set the parameters that enable BMS operation and determine the controlling sensor (see FIG. 6-7 below).

Figure 6-7Parameter Set 4C

Config SH control

The Config SH Control parameter selects the method used to control the modulation of the boiler. This parameter must always be set to 2.

BMS

If BMS control of Cascade has been selected in parameter 4CG, the control must know how to use the 0-10Vdc signal. This can be either temperature based or power based. This parameter can be changed by accessing parameter 4CB. The allowable values for this parameter are “0” for power or “2” for temperature. The

default value is 0.

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Lochinvar 1.3, 1.5 Tank differential temp, Time to switch between HW and SH SH/HW sw tim, Boost function time Boost Tim
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1.5, 1.3, 1 specifications

Lochinvar 1 is a remarkable achievement in the realm of modern technology and engineering. As a powerful and efficient water heater, it has been designed to cater to a wide range of residential and commercial needs. One of the standout features of Lochinvar 1 is its advanced heating technology, which incorporates a high-efficiency condensing design. This technology allows the unit to achieve impressive energy savings by maximizing heat transfer while minimizing energy consumption.

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