United cool air C13-Series, Инструкция по установке, эксплуатации и обслуживанию

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Installation, Operation and Maintenance Manual
C13-Series
40 Subject to change without notice. 10.20-IM (0818)
Water-Cooled Unit
Start-Up Procedures (R-410a Systems)
1� Start up must be performed by a qualified HVAC
Technician�
2� Make certain that all power is disconnected at the main
power circuit breaker or service disconnect before
starting any of this procedure�
3� Check all electrical screw terminals and wiring lugs
for tightness internal to the equipment� Components
may have loosened due to vibration during transit
or handling� Verify that the main power block lug
connections made in the field are tight and secure.
4� Confirm that the voltage rating of the equipment data
tag coincides with the power that will be delivered to
the unit�
5� Verify that the circuit protection for the unit satisfies
Local and National Codes according to the unit data
tag Minimum Circuit Ampacity (MCA) and Maximum
Fuse Size (MFS)�
6� Locate the unit thermostat and check all electrical
terminations against the unit electrical diagram and for
the unit thermostat�
Note: If using a digital thermostat with a “C” (Common)
terminal, this terminal MUST be terminated to the “C”
terminal in the unit� Failure to do so will result in the
thermostat shorting out and being destroyed�
7� Leak check the refrigerant system� While the unit was
leak checked at the factory, leaks can develop during
transit and / or handling�
8�
Confirm that the unit condensate has been adequately
trapped and taken to a suitable point for disposal�
9� Verify that the filters are in place, clean and usable.
10� Switch the unit thermostat to the “OFF” position�
11� Apply power to the unit� Switch the circuit breaker or
field supplied electrical service disconnect switch to the
on position�
Note: If the unit has crankcase heaters and the surrounding
ambient is 70˚ F or lower, let the compressors sit for
approximately 24 hours before proceeding�
12� Record the voltage at the unit terminals�
13� If possible with the thermostat provided, switch the
evaporator blower to the RUN or ON position� Verify
that the evaporator blower is activated�
14� Verify that the evaporator blower is rotating in the
correct direction (three phase units only)�
Note: If the evaporator blower motor runs backwards,
shut off all power to the unit� Switch any two of the
incoming power leads at the unit main power terminal
block� The unit has been wired and phased properly
at the factory� DO NOT change any factory wiring to
correct for a phase problem�
Note: Before conducting the following start up sections
connect a suitable refrigerant gauge set to the unit
Schrader connections� Install temperature sensors to
record the appropriate refrigerant line temperatures�
15� Set the thermostat switch to a temperature set point
approximately 5˚ lower than the space temperature.
Set the thermostat fan switch to the AUTO position� Set
the thermostat operating mode to the COOL position�
This should energize the compressor(s) and evaporator
blower�
Note: Dependent upon the options and/or the thermostat,
there may be a delay for the compressor(s) operation�
16� While waiting for the compressor(s) to stabilize, record
the External Static Pressure (ESP) for the evaporator
blower�
Note: Make sure all the unit access panels are in place when
taking these readings�
17� Verify that the incoming water / fluid pressure does not
exceed the rating for the water / fluid control valves.
18� Verify that the unit piping and heat exchangers will not
be subjected to freezing conditions�
19�
Confirm that no joints are leaking in the cooling fluid
circuit(s)�
20� Document the type of fluid being used as the cooling
medium� If glycol is being used, make sure the mixture
is adequate for any low ambient conditions that may be
possible�
21� If possible, record the fluid flow rate (GPM).
a� Make sure the flow rate is within the proper limits:
i�
Minimum 2�5 GPM / Ton
ii� Maximum 3�5 GPM / Ton
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