Reznor PDH Operation Manual PreevA - Manual (Page 3)

Form O-PreevA, P/N 234661R8, Page 3
2.0 Maintenance
and Service
Information
This unit will operate with a minimum of maintenance. To ensure long life and satisfac-
tory performance, a heating or heating/cooling system that is operated under normal
conditions should be inspected and cleaned according to the Maintenance Schedule.
If in an area where an unusual amount of dust or soot or other impurities are present
in the air, more frequent maintenance is recommended.
When any service is completed, be careful to reassemble correctly to ensure that no
unsafe conditions are created. When re-lighting, always follow the lighting instructions
on the heater.
1.2 DANGER
Warnings and
Requirements
DANGER
Turn off the power before performing all maintenance
procedures (except to check refrigerant pressure and
temperature). Lock disconnect switch in OFF position.
When you turn off the power supply, turn off the gas (gas-
fired units). See Hazard Levels, page 2.
DANGER
If equipped with a DX cooling coil module, this unit
will contain refrigerant and may contain R410A high
pressure refrigerant.
• If equipped with a reheat pump, the reheat circuit
is charged with R410A refrigerant.
• If attached to a Reznor ® MASA condenser unit, the
cooling circuit is charged with R410A refrigerant.
• If attached to a field-supplied condenser unit,
consult the condenser unit information to identify
the type of refrigerant.
All procedures involving any type of refrigerant should
only be performed by a qualified HVAC technician.
In addition, hazards exist with R410A that could result
in personal injury or death. Installation, maintenance,
and service should only be performed by an HVAC
technician qualified in R410A refrigerant and using
proper tools and equipment. Due to much higher
pressure of R410A refrigerant, DO NOT USE service
equipment or tools designed for R22 refrigerant.
IMPORTANT: Do not release refrigerant to the atmosphere! If
required service procedures include the adding or removing
of refrigerant, the service technician must comply with all
federal, state and local laws. The procedures discussed in
this manual should only be performed by a qualified HVAC
technician.