Reznor MASA Unit Installation Manual - Manual (Page 9)

Form I-COND, P/N 220746R6, Page 9
FIGURE 4A - Refrigerant Piping on a PreevA® Split System with the Condensing Unit
Installed at a Higher Level than the Air Handler Unit
*Field-supplied per NEC.
**Field-supplied
SIGHT GLASS/
MOISTURE
INDICATOR **
CONDENSING UNIT INSTALLED ON THE ROOF
TO
CONDENSING
UNIT
FROM
AIR
HANDLER
Line Length NOTES:
1) MAXIMUM LIFT IS
45 FEET (13.7M).
2) MAXIMUM EQUIVALENT
LENGTH OF EACH
STANDARD LINE IS 60 FEET
(18.3M); SEE PARAGRAPH 6,
MECHANICAL.
3) CAUTION: MAXIMUM
EQUIVALENT LENGTH
OF AN OPTIONAL HOT GAS
BYPASS LINE IS 30 FT (9.1M).
TWO-CIRCUIT (1/3-2/3)
CONDENSING
UNIT FOR R-410A
REFRIGERANT
AIR HANDLER
UNIT WITH A
TWO-CIRCUIT (1/3-2/3)
COOLING COIL
FOR R-410A
REFRIGERANT
NOTES:
1. All piping must follow standard piping techniques for R-410A refrigerant. Refer to ASHRAE Guide and
ASME Informational Standards for piping information. Comply with CSA Mechanical Refrigeration Code
CSA B52, ASHRAE Guide Section 15, all municipal codes, and state or provincial requirements.
2. All wiring must comply with all applicable local and national codes.
3. Wiring and piping shown are general points-of-connection guides only and are not intended to apply
to or include all details for a specific installation. Refer to ASHRAE Guide Section 15 for piping details.
4. Internal factory-supplied TXV’s on PREEVA air handler unit are not shown. (Air handler must have
properly sized thermal expansion valves.)
5. Both condenser and evaporator must have two refrigerant circuits that are approximately 1/3-2/3.
6. Evaporative coil must have freeze protection.
ROOF
OPTIONAL “B” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
OPTIONAL “A” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
DISCONNECT
SWITCH *
DISCONNECT
SWITCH *
LIQUID LINE
FILTER DRIER
LIQUID LINE
FILTER DRIER
POWER
WIRE
“B” CIRCUIT
LIQUID LINE
24V CONTROL
WIRE
“A” CIRCUIT
LIQUID LINE
OPTIONAL “A” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
OPTIONAL “B” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
“A” CIRCUIT
SUCTION LINE
“B” CIRCUIT
SUCTION LINE
LIQUID LINE
SOLENOID
VALVE **
LEGEND
NEC - National Electric Code
TXV - Thermostatic Expansion
Valve
Piping