Orion System HB Controller - Manual (Page 5)

Sequence of Operations
5 HB Controller Technical Guide
Controller Sequence of Operations
Dehumidifi cation Mode (No Reheat)
Note: If the HB Controller is confi gured for 1 stage of Cooling,
regardless of the Supply Fan confi guration, the Dehu-
midifi cation call on “RH” is ignored during this mode.
On a call for “RH,” Cooling Stage 1 is energized and the Supply Fan
runs at Low Speed. The Return Air Bypass Damper will open to 100%.
“Y1” is ignored during this mode. On a call for “Y2,” the HB Controller
will enter the Cooling Mode, and the Supply Fan will run at High Speed.
The Cooling Mode will be maintained until both “Y2” and “Y1” are
satisfi ed. As long as there is still a call for “RH,” the Dehumidifi cation
Mode will resume, and the Supply Fan will run at Low Speed.
If the HB Controller is confi gured for 1 stage of Heating, on a call for
“W1,” the mode changes to Heating. Cool Stage 1 will de-energize, the
Return Air Bypass will close, Heat Stage 1 will energize, and the Supply
Fan will run at High Speed.
If the HB Controller is confi gured for 2 or 3 stages of Heating, a “W1”
call will be delayed to extend Dehumidifi cation. On a call for “W2,”
the HB Controller will enter the Heating Mode. Cool Stage 1 will de-
energize, the Return Air Bypass will close, Heat Stage 1 will energize,
and the Supply Fan will run at High Speed. Heat Stage 2 will energize
after the Auto Stage-Up Delay. The Heating Mode will be maintained
until both “W2” and “W1” are satisfi ed. W3 is also available for 3-
Stage Electric Heating Units. As long as there is still a call for “RH,”
the Dehumidifi cation Mode will resume, and the Supply Fan will run
at Low Speed.
Dehumidifi cation Mode with Hot-Gas
Reheat
1-Stage Cooling with Adjustable Two-Speed
or Two-Speed Supply Fan Control
On a call for “RH,” Cool Stage 1 is energized, and the Supply Fan
runs at High Speed. The Return Air Bypass is opened to 100%. The
Hot Gas Reheat will then modulate the valves to achieve the Supply
Air Setpoint DIP Switch setting. On a call for “Y1,” the HB Controller
enters the Cooling Mode. The Return Air Bypass will close, and the
Hot Gas Reheat will modulate to full Cooling. The Cooling Mode will
be maintained until “Y1” is satisfi ed. As long as there is still a call for
“RH,” the Dehumidifi cation Mode will resume.
If the HB Controller is confi gured for 1 stage of Heating, on a call for
“W1,” the mode changes to Heating, and the Supply Fan will run at
High Speed. Cool Stage 1 will de-energize, the Return Air Bypass will
close, Heat Stage 1 will energize, and the Supply Fan will run at High
Speed. If the HB Controller is confi gured for 2 or 3 Stages of Heating,
on a call for “W1,” the Supply Air Setpoint on the Reheat Controller
is raised 10° F, and Cool Stage 1 continues to run. On a call for “W2,”
the HB Controller will enter the Heating Mode. Cool Stage 1 will de-
energize, the Return Air Bypass will close, Heat Stage 1 will energize,
and the Supply Fan will run at High Speed. Heat Stage 2 will energize
after the Auto Stage-Up Delay. The Heating Mode will be maintained
until both “W2” and “W1” are satisfi ed. W3 is also available for 3-
Stage Electric Heating Units. As long as there is still a call for “RH,”
the Dehumidifi cation Mode will resume.
2-Stage Cooling with Adjustable Two-Speed or
Two-Speed Supply Fan Control
On a call for “RH,” Cool Stage 1 is energized, and the Supply Fan runs
at low speed. The Return Air Bypass is opened to 100%. The hot-gas
reheat will then modulate the valves to achieve the Supply Air setpoint
DIP switch setting. On a call for “Y1,” the Supply Air setpoint on the
reheat controller is lowered 10° F, and the Return Air Bypass will close.
On a call for “Y2,” the HB Controller will enter the Cooling Mode. The
Supply Fan will switch to high speed, and Cool Stage 2 is energized. The
modulating hot-gas reheat valves will move to the full Cooling position.
The Cooling mode will be maintained until both “Y2” and “Y1” are
satisfi ed. As long as there is still a call for “RH,” the dehumidifi cation
mode will resume.
If the HB Controller is confi gured for 1 stage of heating, on a call for
“W1,” the mode changes to Heating, and the Supply Fan will run at High
Speed. Cool Stage 1 will de-energize, the Return Air Bypass will close,
Heat Stage 1 will energize, and the Supply Fan will run at High Speed.
If the HB Controller is confi gured for 2 or 3 stages of Heating, on a call
for “W1,” the Supply Air Setpoint on the Reheat Controller is raised
10° F, and Cool Stage 1 continues to run. On a call for “W2,” the HB
Controller will enter the Heating Mode. Cool Stage 1 will de-energize,
the Return Air Bypass will close, Heat Stage 1 will energize, and the
Supply Fan will run at High Speed. Heat Stage 2 will energize after the
Auto Stage-Up Delay. The Heating Mode will be maintained until both
“W2” and “W1” are satisfi ed. W3 is also available for 3 Stage Electric
Heating Units. As long as there is still a call for “RH,” the Dehumidifi ca-
tion Mode will resume, and the Supply Fan will run at Low Speed.
Lockout Modes
Heating Mode is locked out if the HSM (Heat Safety Monitor) trips 3
times during a call for Heating. To reset the lockout condition, either
remove the call for Heating or cycle power to the HB Controller. Heat-
ing Mode is also locked out if the Outdoor Air Temperature is above the
OAT Heat Lockout setpoint temperature.
Cooling Mode is locked out if the LPS (Low Pressure Switch) trips 3
times during a call for Cooling or Dehumidifi cation. To reset the lockout
condition, either remove the call for Cooling or Dehumidifi cation or
cycle power to the HB Controller. Cooling Mode is also locked out if
the Outdoor Air Temperature is below the OAT Cool Lockout setpoint
temperature or if the OAT Sensor is bad or missing.
Economizer and Reheat during Dehumidifi cation modes are locked out
if the SAT sensor is missing.
Note: The Cooling OAT Lockout must be set less than the
Economizer Enable.