Lochinvar 1.3, 1.5 operation manual 11 Outdoor Air Reset Curve, 12 Parameter Set 4G, 6Parameters

PC Program Instructions

6Parameters

Figure 6-11Outdoor Air Reset Curve

To adjust the BMS settings, click on the tab labeled 4G BMS (see FIG. 6-12 below).

Figure 6-12Parameter Set 4G

BMS Setpoint at min voltage (BMS setpt min V)

If parameter 4CB is set to 2, the control must know what minimum setpoint temperature to use. This can be changed by accessing parameter 4GA. The temperature range for this parameter is 32°F (0°C) to 248°F (120°C). The default value is 70°F (21°C).

BMS Setpoint at max voltage (BMS setpt max V)

If parameter 4CB is set to 2, the control must know what maximum setpoint temperature to use. This can be changed by accessing parameter 4GB. The temperature range for this parameter is 32°F (0°C) to 248°F (120°C). The default value is 180°F (82°C).

BMS Voltage at low setpoint (BMS V Min Setpt)

If parameter 4CB is set to 2, the control must know what voltage corresponds to the minimum setpoint. This can be adjusted by accessing parameter 4GC. The voltage range for this parameter is 0Vdc to 4GD The default value is 2Vdc.

BMS Voltage at high setpoint (BMS V Max Setpt)

If parameter 4CB is set to 2, the control must know what voltage corresponds to the maximum setpoint. This can be adjusted by accessing parameter 4GD. The voltage range for this parameter is 0Vdc to 4GC. The default value is 10Vdc.

Min BMS voltage to start demand (BMS V Heat)

If parameter 4GK is set to 1, then the heat demand will be generated by the voltage present on the 0-10Vdc input. Parameter 4GE determines the voltage at which the SMART SYSTEM control initiates a heat demand. The range for this parameter is 4GF to 10Vdc. The default value is Vdc.

Differential to stop BMS demand (Drop in BMS End)

If parameter 4GK is set to 1, then the heat demand will be generated by the voltage present on the 0-10Vdc input. Parameter 4GF determines how far below the starting voltage (parameter 4GE) the voltage must drop before the heat demand ends. The range for this parameter is 0Vdc to 4GE. The default value is 1Vdc.

BMS Power at min voltage (BMS mod @minV)

If parameter 4CB is set to 0, the control must know what minimum power level is to be used. This can be changed by accessing parameter 4GG. The range for this parameter is 20% to 4GH. The default value is 20%.

BMS Power at max voltage (BMS mod @maxV)

If parameter 4CB is set to 0, the control must know what maximum power level is to be used. This can be changed by accessing parameter 4GH. The range for this parameter is 4GG to 100%. The default value is 100%.

18