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Options (ES50LVS and ES90LVS)
Mode
Constant circulating fan - runs at Heat CFM rate
Constant low circulating fan (2)
Multi-stage
Single-stage
Normal Fan Cooling - runs at higher Cool CFM rate
Dehumidification Fan Cooling (3)
Not used
Not used
(2) ES90LVS runs at 400 CFM, ES50LVS runs at 300 CFM.
(3) Fan Cooling runs at lower COOL CFM rate for 15 min. and then goes to higher rate.
SEQUENCE OF OPERATION
Multi-stage Operation
Thermostat calls for heat
R is connected to W
Heat generator is turned on
Auxiliary 24VAC power is turned on
Pump turns on 100%
After a 15 second delay to allow for system water to heat up coil, fan ramps up as
follows:
1. Stage 1 - Lower HEAT CFM fan speed for 5 minutes
If a variable speed pump is installed, it runs at LO. If a standard single speed AC
pump is installed it runs at HI.
2. Stage 2 - Medium HEAT CFM fan speed for 5 minutes
If a variable speed pump is installed, it runs at MED. If a standard single speed AC
pump is installed it runs at HI.
3. Stage 3 - High HEAT CFM fan speed until thermostat is satisfied
If a variable speed pump is installed, it runs at HI. If a standard single speed AC
pump is installed it runs at HI.
SWITCH 1
SWITCH 2
OFF
X
ON
X
X
OFF
X
ON
X
X
X
X
X
X
X
X
SWITCH 3
SWITCH 4
X
X
X
X
X
X
X
X
OFF
X
ON
X
X
X
X
X
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P a g e
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