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Adjustments and Calibration
Thermal calibration is not required . Minimum and maximum control points can be calibrated before or
after the thermostat has been installed.
Adjusting the thermostat:
1. Using 1/16" hex/key, turn the setscrews on each side of the unit clockwise until the cover loosens.
2. Verify 16 VDC between the "+" and "–" terminals.
3. Remove set point slider stops (HFO-0027) if necessary.
4. Measure "T (?)" to "–" for output voltage. See table (below) to determine correct terminal.
5. Maximum limits MUST be greater than minimum limits. If in doubt, turn Max. limit fully clockwise
(increase) before proceeding.
NOTE: Dials rotate approximately 200° (8:00-4:00). DO NOT force dial beyond stop.
6. Connect voltmeter to to the meter taps (Using HSO-5001):
a. The two holes on the right are for the min. and max.
b. Measure actual flow in left holes. Thermostat must be wired to controller for this option.
7. Always adjust the minimum first. Adjust set point to request minimum flow using the minimum dial:**
DA Cooling; Set point > Room Temp.
RA heating; Set point < Room Temp.
8. Adjust set point to request maximum flow using the max. dial:**
RA Heating; Set point > Room Temp.
DA Cooling; Set point < Room Temp.
** Note: Limits may be set at the CSP or the thermostat. If setting min/max limits at the thermostat,
CSP's Min. dial must be turned fully CCW to "0" AND the Max. dial must be turned fully
CW to "100". This ensures that the CSP will not effect the limits.
Thermostat
Terminal
V1
T3
R1
T1
+
12V
A
–
T2
R2
*T4
V2
* Except 5104; T2 lower setpoint output is w/o limits. R2 is auxiliary limit trigger, voltage above 1
VDC @ R2 indexes T1 to the auxiliary flow limit
5101
5102
5103/ 5105
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5104
Description
X
Velocity input for read-out
X
Upper set-point output w/o limits
X
T1 override connect to "–" if unused
X
Upper set-point output w/limits
X
16 VDC power supply input
X
12 VDC power output
X
Temperature averaging input
X
Ground reference
X
Lower set-point output w/limits*
X
T2 override, connect to "–" if unused.*
Lower sett-point out w/o limits
Velocity input for read-out
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