Switch delay, Heavy load sequence 2nd group, Condensing and non-condensing boiler type – LAARS M4-LHS - Installation Manual User Manual
Page 21: Condensing and non-condensing boiler number
HT# 059295-00
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M4-LHS installation and Operation Manual
21
Switch Delay
Adjustable from 0.0 to 12.0 Hours
Default: 0.5 hours
Button: MENU/<System Startup>/..../Switch Setpoint/Switch Diff/Switch Delay
• The Switch Delay is an additional layer of assurance used to reduce the intermittent change
of the lead group.
• To switch the lead group when the temperature is dropping, the sensor temperature must
remain below the Switch Set Point less the Switch Differential for the complete Switch
Delay period before the switching of the lead group.
• I.e., if the Switch Set Point was set to 135ºF, and the Switch Differential was set to 5ºF, then
the Target Temperature must drop below 130ºF for the complete Switch Delay for the lead
group to change from Condensing to Non-Condensing.
• To switch the lead group when the temperature is rising, the Target Temperature must rise
above the Switch Set Point for the complete Switch Delay before the switching of the lead
group could take effect.
--- SWITCH DELAY ---
0.5
Hour
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Heavy Load Sequence 2nd group
Yes, No
Default: No
Button: MENU/<System Startup>/..../Switch Delay/Heavy Load Seq#2 Group
• This option makes the second group of boilers act as a backup in heavy load conditions.
Thus, allowing them to start after all lead group boilers have run at their maximum capacity.
• If the system was designed to operate both groups of boilers in heavy load conditions, then
select Yes.
• Selecting No will only allow the lead group to operate. The secondary group will remain off
even if the system cannot reach the desired set point.
HEAVY LOAD
-SEQUENCE #2 GROUP-
No
Yes
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Condensing and Non-Condensing Boiler Type
Modulating, Staging
Default: Modulating
Button: MENU/<System Startup>/..../Heavy Load Seq#2 Group/Condensing Boiler Type
• Select the appropriate boiler type from the list. Each of the types will be followed by a
related additional configuration settings to adjust.
CONDENSING
---- BOILER TYPE ----
Modulating
Staging
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Condensing and Non-Condensing Boiler Number
Adjustable from 1 to 15
Default: 1
Button: MENU/<System Startup>/..../Condensing Boiler Type/ Condensing Boiler Number
• Select the number of condensing boilers. These boilers will occupy the first letters of the
wiring stages on the M4-LHS starting with Stage-A.
• Then, select the number of non-condensing boilers later in the Startup menu. See "HYBRID
• Note that, each Multi-Stage boiler requires the use of single output stage relay.
CONDENSING
-- BOILER NUMBER --
1
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BACK ▲ ▼ SAVE