Reznor MASA Unit Installation Manual - Manual (Page 14)

Form I-COND, P/N 220746R6, Page 14
TABLE 4 - Two Liquid
Line Filter Driers are
Shipped Loose in the
Condensing Unit
MASA Refrigerant Circuit
R410A Liquid Line Filter Driers Shipped in the
Condensing Unit for Field Installation
Si ze Tons Circuit Tonnage Model Reznor P/N Connection Size
60 5
A 2 C-084-S 177378 1/2
B 3 C-164-S 177379 1/2
90 7.5
A 2.5 C-084-S 177378 1/2
B 5 C-304-S 216408 1/2
120 10
A 3.3 C-164-S 177379 1/2
B 6.6 C-304-S 216408 1/2
150 12. 5
A 4.2 C-164-S 177379 1/2
B 8.3 C-304-S 216408 1/2
180 15
A 5 C-304-S 216408 1/2
B 10 C-414-S 216409 1/2
240 20
A 6.6 C-304-S 216408 1/2
B 13.4 C-415-S 216410 5/8
6.0 Mechanical
(cont’d)
must be pointing toward the evaporator coil. If liquid line piping is not the same
size, use a field-supplied fitting. Protect the filter drier from excessive heat
when brazing.
6.1.3.3 Liquid Line
Piping (cont’d)
Thermostatic Expansion Valves - The thermostatic expansion valves are
field-supplied or ordered as options with the air handler. The valves must be
designed for R-410A refrigerant and sized correctly for each circuit. A
thermal expansion valve with an external equalizer is required. To ensure
the correct pressure is signaled to the valve, the external equalizer line
must be installed immediately downstream of the thermal expansion
valve.
CAUTION:
The thermostatic expansion valves must be sized to match the
circuit. Failure to properly size the thermostatic expansion valves
will prevent the system from operating properly and will void the
manufacturer’s warranty. See Hazard Levels, page 3.
If the thermostatic expansion valves are not pre-installed on the air handler,
install the outlet of the valve to the distributor connection on the evaporator
coil. (Exception NOTE: If there is an optional hot gas bypass line in the circuit,
it must be allowed to connect directly into the distributor downstream of the
thermostatic expansion valve; see Paragraph 6.1.3.6.)
Thermostatic expansion valves are sized for the capacity of the circuit so be
careful to match the valve to the correct circuit. Always wet wrap the valve
body when brazing, but do not allow moisture to enter the tubing. Braze with
the flame pointed away from the valve. Follow the instructions supplied from
the valve manufacturer.
After the refrigerant lines are installed and before startup, extend the bulb from
the valve in Circuit A to the Circuit A suction line. Extend the bulb from the Cir-
cuit B valve to the Circuit B suction line. Comply with the valve manufacturer’s
instructions on bulb placement. General recommendations are listed below.
•
Verify that the suction line is the correct circuit.
•
Place bulb on suction line as close to the evaporator coil outlet as possible.
•
Place the bulb on a straight horizontal section of suction line (if bulb must
be vertical, line must be descending).
•
Never place bulb in a trap or downstream of a trap.
•
Position bulb as shown in FIGURE 5A.
•
Bulb must have 100% contact with tubing.
•
Secure the bulb tightly.
•
Cover bulb with waterproof insulation.
6.1 Refrigerant
Piping (cont’d)
6.1.3 Refrigerant
Piping Guidelines
(cont’d)