Reznor MASA Unit Installation Manual - Manual (Page 26)

Form I-COND, P/N 220746R6, Page 26
STEP 2) From Temperature/Pressure Conversion Chart,
APPENDIX, page 40, convert Measured Pressure (STEP
1) to ________°F (°C)
STEP 3) Subtract Measured Temperature (STEP 1) from
Temperature from Conversion Table (STEP 2)
________°F (°C) - ________°F (°C) = ________°F (°C)
degrees of Superheat
Recommended superheat is 8-12°F (4.5-6.7°C).
Typically, too much superheat indicates that the evaporator coil is
undercharged. Too little superheat typically indicates that the evapo-
rator coil is overcharged and may potentially flood liquid refrigerant
to the compressor. To reduce the superheat, adjust the thermostatic
expansion valve by turning the adjusting stem counterclockwise. To
increase the superheat, adjust the thermostatic expansion valve by
turning the adjusting stem clockwise.
9.2.4 Optional Hot Gas Bypass Valve
□
If the system is equipped with an optional hot gas bypass, check
operation of the valve. Set if needed. Follow the instructions in Para-
graph 8.3.3.
9.0 Final Checks
and Start-Up
(cont’d)
9.2.3 Refrigerant
Charge (cont’d)
9.2.3.1 Check
SUBCOOLING
(cont’d)
9.2 Start-up (cont’d)
10.0 Maintenance
and Service
WARNING
Turn off the power before performing all maintenance
procedures (except to check subcooling and superheat).
Lock disconnect switch in OFF position. See Hazard Levels,
page 3.
10.1 General
9.3 After Startup: Assumptions: All checks have been successfully performed and the
system is operating properly. All panels and doors are secure. The area
has been cleared of any excess supplies, scrap, and debris.
□
Check that the information on page 44 has been completed.
After startup, put this manual with completed startup form (page
41), the warranty form, and any other instructions provided with the
unit in the Literature Bag.
Return the “Literature Bag” to the low voltage compartment of the
unit or give it to the building owner for safe keeping.
This condensing unit will operate with a minimum of maintenance. To ensure
long life and satisfactory performance, an air conditioning system that is oper-
ating under normal conditions should be inspected according to the Mainte-
nance Schedule below. If in an environment where an unusual amount of dust
or soot or other impurities are present, more frequent inspection is recom-
mended.
The procedures in the schedule below are only for the condensing unit.
Refer to and comply with the maintenance schedule for the Reznor
PreevA ® unit or other air handler with evaporator.