Reznor RXH (Outdoor PreevA) Unit Installation Manual - Manual (Page 63)

Form I-RDH/REH/RHH/RXH (12-14), P/N 215210 R14, Page 63
 Models RDH and RHH - With the unit in operation, measure valve outlet gas
pressure. If operated at high altitude, adjust outlet gas pressure for altitude if
required.
See information and instructions in Paragraph 6.1.2 and 6.1.3.
 Models RDH and RHH - Turn the unit off and on, pausing two minutes between
each cycle. Observe for smooth ignition. On two-stage or modulating burner
systems, manipulate temperature adjustment slowly up and down to see if control
is sequencing or modulating properly.
 If the system is equipped with an optional dirty filter switch, set the switch. Follow
the instructions in Paragraph 7.6.3.
 If the system is equipped with a reheat pump, check the refrigerant subcooling and
superheat.
Instructions for Checking and Adjusting the Subcooling of an Isolated Circuit acceptable subcooling readings
range from 14° to 18°F (7.8° to 10°C).
Measure and record temperature and pressure of the liquid line at the condenser coil outlet.
STEP 1) Record Measurements: Temperature = ________°F (°C) and Pressure = ________ psig
STEP 2) From Temperature/Pressure Conversion Chart, APPENDIX, page 66, convert Measured Pressure
(STEP 1) to ________°F (°C)
STEP 3) Subtract Measured Temperature (STEP 1) from Temperature from Conversion Chart (STEP 2)
_______°F (°C) - ________°F (°C) = ________°F (°C) degrees of Subcooling
Instructions for Checking and Adjusting the Superheat of an Isolated Circuit (Superheat should be in the 8° to
12°F (4.5° to 6.7°C) range.) :
Measure and record temperature (insulate probe from surrounding air temperature) and pressure in the suction
line at the compressor inlet.
STEP 1) Record Measurements: Temperature = _______°F (°C) and Pressure = _______ psig
STEP 2) From Temperature/Pressure Conversion Chart, APPENDIX, page 66, convert Measured Pressure
(STEP 1) to _______°F (°C)
STEP 3) Subtract Measured Temperature (STEP 1) from Temperature from Conversion Table (STEP 2)
_______°F (°C) - ________°F (°C) = ________°F (°C) degrees of Superheat
 Place "Literature Bag" containing Limited Warranty, this booklet, the operation
manual, and any optional information including the digital control instructions in an
accessible location near the heater. Follow the instructions on the envelope.
 IMPORTANT: After at least 8 hours but no longer than a week of operation,
recheck the blower wheel, all set screws, blower pulley, motor pulley, and belt
tension. Make any required adjustments.
Operating and Heating Sequence - Electric Heat Model REH
Turn on power to the unit.
- Outside air dampers open.
- Damper end switch closes energizing the blower motor.
- Unit is controlled by FX06 controller (with sensors in outside and discharge air.)
- Temperature control staging is based on sensor setpoints and inputs.
Heating Sequence - Model REH :
1) On a call for heat from the FX06 controller, the blower energizes.
2) Supply air switch closes and the first stage of electric heat is energized.
3) Subsequent staging is controlled by the FX06 controller (Option D12E) or by the
FX06 controller with modulation control from the SCR power controller (Option
D12D).