Reznor MASA Unit Installation Manual - Manual (Page 10)

Form I-COND, P/N 220746R6, Page 10
6.0 Mechanical
(cont’d)
FIGURE 4B - Refrigerant Piping on a PreevA® Split System with
the Condensing Unit Installed at a Lower Level than the Air
Handler Unit
CONDENSING UNIT INSTALLED AT GROUND LEVEL
FROM
AIR
HANDLER
REPRESENTATIVE
TRAPS
*Field-supplied
per NEC.
**Field-supplied
SIGHT GLASS/
MOISTURE
INDICATOR **
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.
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).
DISCONNECT
SWITCH *
OPTIONAL “A” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
OPTIONAL “B” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
“B” CIRCUIT
SUCTION LINE
“B” CIRCUIT
LIQUID LINE
24V CONTROL
WIRE
DISCONNECT SWITCH *
“A” CIRCUIT
SUCTION LINE
“A” CIRCUIT
LIQUID LINE
LIQUID LINE
FILTER DRIER
LIQUID LINE
FILTER DRIER
OPTIONAL “B” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
OPTIONAL “A” CIRCUIT HOT GAS
BYPASS (See Line Length NOTE 3)
POWER
LINE
LIQUID LINE
SOLENOID VALVE **
TWO-CIRCUIT (1/3-2/3)
CONDENSING UNIT
FOR R-410A
REFRIGERANT
GROUND
(PAD)
LEGEND
NEC - National Electric Code
TXV - Thermostatic Expansion Valve
- Piping