Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 33)

Form I-PDH/SDH/PEH/SHH/PXH, Page 33
6.6.1 General
The draw-through cooling coil module is factory assembled to the entering air side of
the system blower cabinet. Depending on which options were ordered, it will house
either a single, dual, or 1/3-2/3 circuit DX cooling coil or a chilled water coil with 1/4,
1/2, 3/4, or full circuiting. Depending on the option, the module can include a reheat
circuit which is factory charged with R410A refrigerant.
The DX coil will accommodate the refrigerant specified on the order, either R410A,
R134a, or R407c. Verify that the correct refrigerant was specified. If the coil was ordered
for the incorrect refrigerant, contact your distributor or the factory for revised capacity
ratings and appropriate distributor nozzle(s). Distributor nozzles may be changed in
the field by a qualified technician.
If being installed with a matching Reznor
® Model MASA condensing unit, the coil must
be charged with R410A refrigerant. Follow the instructions in the condensing unit
installation manual (Form I-COND) to connect the piping and charge the system.
Condensing related controls such as thermal expansion valves and hot gas bypass
may have been ordered factory installed for R410A refrigerant only. All such controls
for other refrigerants must be field supplied.
This split air-conditioning system requires a matching Reznor
® MASA or field-supplied
condensing coil. Follow the instructions provided by the condensing coil manufacturer
to make the piping connections and charge the system. If equipped with a multi-circuit
coil, before making connections, blow dry nitrogen into the circuit to determine which
distributor goes with which suction line. (See connection dimensions in FIGURE 27A
or 27B.)
The coil module drain trough has an exterior 1” NPT connection. Connect the drain
into a sanitary drain system. The condensate trough and drain require periodic clean-
ing and are listed in the maintenance schedule (See Form O-PREEVA). The slide out
drain pan can be removed for cleaning. The service clearance for the control side of
the cooling module must be maintained; see TABLE 3, page 7.
Both sides of the cooling coil module have removable door panels for routine coil
inspection and cleaning.
Cooling control depends on which system control was ordered. If digital heating/cool-
ing controls (Option DG1, DG2, DG5, DG6, D12B, D12C, D12D, D12E, D12F, D12G)
were ordered, see Paragraph 8.3 and the control instruction form for information. If the
cooling module was ordered with an optional reheat section (Option AU7L or AU7R),
the reheat circuit is factory charged with R410A refrigerant.
6.6 Cooling Module
- Option AU on
PDH, SDH, PEH,
SHH, and PXH
CAUTION: When installing a unit that includes a cooling module in a location such as an
attic that can experience high dewpoint conditions, a field-supplied drain pan should be
installed under the entire unit for water management control. High dewpoint conditions
have the potential to form condensation on the exterior of the unit. See condensate drain
requirements in Paragraph 6.6.3.
DANGER
The reheat circuit contains R410A high pressure refrigerant. Hazards exist 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. 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.