Orion System HB Controller - Manual (Page 34)

Zone
Zone
MHGRV Module Settings
34
HB Controller Technical Guide
Supply Air Temperature
You can set the desired Discharge Air Temperature Setpoint using the
DIP Switch labeled SETPOINT on the MHGRV Module. See Figure 9
for location and DIP Switch setting instructions. The MHGRV Module
will allow you to set a Supply Air Temperature Setpoint between 50° F
and 100° F. If a value of less than 50° F is set, the controller will default
to a 50° F Supply Air Temperature Setpoint. A value greater than 100°
F will cause the unit to default to a 100° F Supply Air Temperature
Setpoint.
Supply Air Temperature Reset Limit
You can reset the Supply Air Temperature Setpoint by supplying a 0-10
VDC control signal to the Reset Input (MHGRV RESET) terminal on
the HB controller board. The reset range is determined by the setting
confi gured on the DIP Switch labeled “RESET LIMIT.” See Figure 9
for location and setting instructions. The controller will reset the Sup-
ply Air Temperature Setpoint from the value set on the SETPOINT DIP
Switch to the value set on the RESET LIMIT DIP Switch as the Reset
Input (RST IN) signal is increased from 0 Volts to 10 Volts.
Example:
We want the Discharge Air Temperature Setpoint to increase from 55° F
when the Reset Input signal is at 0 Volts to 75° F when the Reset Input
signal is at 10 Volts.
•
Set the SETPOINT DIP Switch to 55° F
•
Set the RESET LIMIT DIP Switch to 75° F
The discharge air temperature will now increase from 55° F to 75° F as
the Reset Input voltage signal ramps from 0 Volts to 10 Volts.
Note: It is possible to create a “reverse acting” control sequence.
Using the temperatures from the example above by set-
ting the SETPOINT DIP Switch to 75
° F and the RESET
LIMIT DIP Switch to 55 ° F, the reset would be reverse
acting. In this case, the controller will maintain a 75 ° F
discharge temperature when the Reset Input signal is at
0 Volts and will reduce to 55
° F when the Reset Input
signal is at 10 Volts.
Optional MHGRV Module Settings
Figure 9: DIP Switch Setting Instructions
DIP Switch Setting Shown
Is For A Setpoint Of 53
DIP Switch Setting Shown
Is For A Setpoint Of 94
ADD ADD
32 + 16 + 4 + 1 = 53 64 + 16 + 8 + 4 + 2 = 94
All Rocker Switches Depressed
In the Direction Of The ADD Arrow
Are Added Together To Total The Setpoint
HBl DIP Switch
Detail View
1
1
F
O
F
F
O
F
ADD
SETPOINT
0-10 VDC
Supply Air
Temp Reset
Signal
RESET
LIMIT
4
4
2
2
16
16
8
8
64
64
32
32
128
128
MOD HGR
EXTERNAL
INTERNAL
LD3
LD2
LD1
JO2 JO1
D1
C3 R4
VR1
Q1
C2
Q8
D20
K2
R70
R46
R48
R50
C21
R31
R33
LM358 9936 U3
C35
LM358 9936
Q9 D19
C36
D21
OFF
D2
U7
C7
RESET
PROGRAM SOCEKT
128
LIMIT
32
64
16
8
RN3
P1
C1
C2
U4
RN1
P2 D1
C5
R4
C10
R5
R6
C11
SERIAL #
OFF
SETPOINT
4
2
1
128
64
ADD
32
16
8
4
2
1
C3
X1
C9 C8
U2
REV 1
YS101988
RN2
HB MHGR
LED2
R2 R3 R1
LED1
VA
LV
E HGR
U5
MADE
IN
THE
U SA
C4
L1
C12
GND
RH
Y1
G
GND
R
SAT
POS
POS
GND
GND
RAB
RAB
TB2
RESET
RESET
ECONO
ECONO
MHGRV
MHGRV
TB1