Reznor RXH (Outdoor PreevA) Unit Installation Manual - Manual (Page 35)

Form I-RDH/REH/RHH/RXH (12-14), P/N 215210 R14, Page 35
6.6.1 Cooling Coil Module 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. A DX coil will accommodate the refrigerant specified on the
order, either R410A, R134a, or R407c. Verify that the correct refrigerant was speci-
fied. 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 a cooling module was ordered with an optional reheat section (Option AU7L or
AU7R), the reheat circuit is factory charged with R410A refrigerant.
The split air-conditioning system requires a field-supplied condensing coil. Follow the instructions provided by the
condensing coil manufacturer to make the piping connections. If equipped with a multi-circuit coil, before making con-
nections, blow dry nitrogen into the circuit to determine which distributor goes with which suction line. (See connection
dimensions in FIGURE 31 for chilled water or FIGURE 32A or 32B for DX coil
NOTE: If ordered with a Reznor ® Model MASA condensing unit, follow the instructions in Form I-COND (shipped with
the condensing unit) for connecting the split system.
The coil module drain trough has an exterior 1” NPT connection. Connect the drain into a sanitary drain system. The
condensate trough and drain requires periodic cleaning.
Cooling control depends on which system control was ordered. If digital heating/cooling controls were ordered, see
Paragraph 8.3 and the control instruction form for information. If the cooling module was ordered with optional reheat
(Option AU7L or AU7R), the reheat circuit is factory charged with R410A refrigerant.
Condensing related controls such as thermal expansion valves and hot gas bypass may have been ordered with the unit
(R410-A only) or may be supplied locally.
6.6 Optional Cooling
Coil Module
(factory installed)
DANGER (Applies to Optional Reheat Circuit)
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.
1” MPT
Drain
1-1/2”
MPT
with 1/4” NPT
Vent
A
with 1/4”
NPT
Drain
7-27/32”
(199mm)
10-9/64”
(258mm)
16-13/16”
(427mm)
19-31/32” (507mm)
3-3/32” (79mm)
Inlet Air View
(factory attached to
optional mixing
box or evaporative
cooling module or
location for field-
installed hood)
This
end is
attached
to the
blower
cabinet
at the
factory.
Side
View
Airflow
FIGURE 31 - Dimensions of Chilled Water Cooling Coil Module, Option AU6
TABLE 22 - Chilled Water Cooling
Coil Module Dimensions
RDH
Size
REH
Size
RHH
Size
RXH
Size
A
inches mm
75/100/
125/150
10A/20A/
40A/15B/
30B/60B
N/A 000A/
000B 33-1/4
844
175/200/
225/250/
300/350/
400A
30D/60D/
90D/120D/
40E/80E/
120E
130/
180/
260/
350
000C/
000D/
000E
43-7/32 1199
6.6.2 Cooling Coil Module Dimensions
is restored. Check the “ON” timing; the media pads should be wet from top to bottom
during the ON cycle.
If the preset timing is not suitable for the application, follow the instructions supplied
with the microprocessor to change the calibration of the “ON” and/or “OFF” cycle.
All Evaporative Cooing Modules - Check the reservoir for any water leaks. If any small leaks are present, drain the
reservoir. Dry and apply a waterproof silicone sealer around corners and welds.