Specifications

14
ENVISION COMMERCIAL SPECIFICATION CATALOG
Heat, 2nd Stage (Y1,Y2) Single-Speed Units
Blower changes to high speed 15 seconds after the “Y2”
input (ECM only).
Heat, 2nd Stage (Y1,Y2) Dual Capacity Units
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first
stage compressor run time of 1 minute has expired. The
ECM blower changes from medium to high speed 15 sec-
onds after the “Y2” input.
The Comfort Alert will delay the second stage compressor
until 5 seconds after it receives a “Y2” from the board.
Heat, 3rd Stage (Y1,Y2,W) Single-Speed Units
The first stage of resistance heat is energized 10 seconds
after “W” input, and with continuous 3rd stage demand,
the additional stages of resistance heat engage sequen-
tially every 5 minutes.
Heat, 3rd Stage (Y1,Y2,W) Dual Capacity Units
The 1st stage of resistance heat is energized 10 seconds af-
ter “W” input, and with continuous 3rd stage demand, the
additional stages of resistance heat engage sequentially
every 5 minutes.
Emergency Heat (W only)
The blower is started on high speed, and the first stage of
resistance heat is energized 10 seconds after the “W” in-
put. Continuing demand will engage the additional stages
of resistance heat sequentially every 2 minutes.
Cooling Operation
In all cooling operations, the reversing valve directly tracks
the “O” input. Thus, anytime the “O” input is present, the
reversing valve will be energized.
Cool, 1st Stage (Y1,O)
The blower motor and hot water pump are started imme-
diately, the loop pump(s) is energized 5 seconds after the
“Y1” input is received. The compressor will be energized
(on low capacity for Dual Capacity units) 10 seconds after
the “Y1” input. The ECM blower will shift from low to medi-
um speed 15 seconds after the “Y1” input (85% of medium
speed if in dehumidification mode).
Cool, 2nd Stage (Y1, Y2, O) Single Speed Units
The blower changes to high speed (85% of high speed if
in dehumidification mode) 15 seconds after the “Y2” input
(ECM only).
Cool, 2nd Stage (Y1, Y2, O) Dual Capacity Units
The second stage compressor will be activated 5 sec-
onds after receiving a “Y2” input as long as the minimum
first stage compressor run time of 1 minute has expired.
The ECM blower changes to high speed 15 seconds after
the “Y2” input. (85% of high speed if in dehumidification
mode). The Comfort Alert will delay the second stage
compressor until 5 seconds after it receives a “Y2” from
the board.
Blower (G only)
The blower starts on low speed (PSC ON). Regardless of
blower input “G” from thermostat, the blower will remain
on low speed for 30 seconds at the end of each heating,
cooling or emergency heat cycle.
A DIP switch on the Envision control allows field selection
of 15% reduced blower speeds for cooling in the dehu-
midification mode or medium and high blower speeds for
cooling in the normal mode.
Note: Blower speed can change automatically only with
an ECM Motor.
ECM2 Airflow Selection DIP Switches (SW1)
A 12-position DIP switch package on the Envision control
allows the airflow levels to be set for low, medium and high
speed. (Refer to Blower Performance Data - ECM Motor).
Only three of the DIP switches can be in the “on” position.
The first “on” switch (the lowest position number) deter-
mines the “low speed blower” setting. The second “on”
switch determines the “medium speed blower” setting, and
the third “on” switch determines the “high speed blower”
setting.
Lockout Conditions
During lockout mode, the appropriate unit and thermostat
lockout LEDs will illuminate. The compressor, loop pump,
hot water pump, and accessory outputs are de-energized.
Unless the lockout is caused by an ECM2 low RPM fault,
the blower will continue to run on low speed. If the ther-
mostat calls for heating, emergency heat operation will
occur.
Comfort Alert lockouts cannot be reset at the thermostat.
All other lockout modes can be reset at the thermostat
after turning the unit off, then on, which restores normal
operation but keeps the unit lockout LED illuminated. In-
terruption of power to the unit will reset a lockout without
a waiting period and clear all lockout LEDs.
High Pressure
This lockout mode occurs when the normally closed safety
switch is opened momentarily (set at 600 PSI).
Envision Controls - Premier cont.