Orion System HB Controller - Manual (Page 35)

MHGRV Module Settings
35 HB Controller Technical Guide
When a change is made to the DIP Switch settings for either the setpoint
or reset, power does not have to be cycled in order for the controller
to read their values. The DIP Switch settings and their corresponding
setpoints can be changed while power is applied, and the new settings
will be accepted. The same is true for entering or leaving the force mode
DIP Switch settings.
The modulating reheat system on the HB Unit is comprised of two
valves, one for the condenser coil and one for the reheat coil. The valves
operate directly opposite of each other. The MHGRV Controller will
move the valves to the full Cooling position on power up after valve
calibration. The condenser valve will be fully opened, and the reheat
valve will be fully closed. This is the default confi guration when no
reheat is required.
For fi eld-testing purposes, the modulating hot-gas valves can be forced
to full Cooling or full Reheat via DIP Switch settings on the MHGRV
Controller. See Table 1 for mode of operation and valve position dur-
ing force modes.
MHGRV Valve - Position & Operation
Setpoint
Value
Reset Limit
Value
Mode of
Operation
HGR Valve
Position
1 3 Full Cooling 100% Closed
3 1 Full Reheat 100% Open
3 3 Half Reheat/Cool 50% Open/Close
Table 1: MHGRV Valve Position & Operation
Note: For a value of 1, only turn on DIP Switch labeled 1.
For a value of 3, turn on DIP Switches 1 and 2. The
DIP Switches are added together to complete a specifi c
value.
Warning: When force mode testing is complete, reset the DIP
Switch settings to a valid temperature setting. Do
not leave the MHGRV DIP Switches set in force
mode when leaving the job site.
Optional MHGRV Module Settings