Carrier 50YER036, Инструкции по установке, эксплуатации и обслуживанию

Страница: 25 / 34

UNIT CHECKOUT
q
Balancing/Shutoff Valves:
Ensure all isolation
valves are open, water control valves wired and
open or coax may freeze and burst.
q
Line Voltage and Wiring:
Ensure Voltage is within
an acceptable range for the unit and wiring and
fuses/breakers are properly sized. Low voltage
wiring is complete.
q
Unit Control Transformer:
Ensure transformer has
properly selected control voltage tap. 208-230V
units are factory wired for 230 operation unless
specified otherwise.
q
Entering Water:
Ensure entering water temperatures
are within operating limits of Table 5.
q
Low Water Temperature Cutout:
Verify low water
temperature cut-out on CXM is properly set.
q
Water Flow Balancing:
Verify inlet and outlet
water temperatures on both Load and source
are recorded for each heat pump upon startup.
This check can eliminate nuisance trip outs and
high velocity water flows that can erode heat
exchangers.
q
Unit Controls:
Verify CXM settings are proper and
complete.
SYSTEM CHECKOUT
q
System Water Temperature:
Check load and
source water temperature for proper range and
also verify heating and cooling setpoints for proper
operation.
BEFORE POWERING SYSTEM, please check the following:
q
System pH:
System water pH is 6 - 8.5. Proper
pH promotes longevity of hoses and fittings.
q
System Flushing:
Verify all hoses are connected
end to end when flushing to ensure debris
bypasses unit heat exchanger and water valves etc.
Water used in the system must be potable quality
initially and clean of dirt, piping slag, and strong
chemical cleaning agents. Verify all air is purged
from the system. Air in the system can cause poor
operation or system corrosion.
q
Cooling Tower/Boiler:
Check equipment for
proper setpoints and operation.
q
Standby Pumps:
Verify the standby pump is
properly installed and in operating condition.
q
System Controls:
Verify system controls function
and operate in the proper sequence.
q
Low Water Temperature Cutout:
Verify low water
temperature cut-out controls are provided for the
outdoor portion of the loop or operating problems
will occur.
q
System Control Center:
Verify control center and
alarm panel for proper setpoints
and operation.
q
Strainers:
Verify 20 mesh (841 micron) [0.84mm]
strainers are installed in load and source water
piping. Confirm maintenance schedule for strainers.
q
Miscellaneous:
Note any questionable aspects of
the installation.
�
WARNING!
�
Verify ALL water controls are open and allow water flow
prior to engaging the compressor. Freezing of the coax or
water lines can permanently damage the heat pump.
�
WARNING!
�
To avoid equipment damage, DO NOT leave system
filled in a building without heat during the winter unless
antifreeze is added to system water. Condenser coils
never fully drain by themselves and will freeze unless
winterized with antifreeze.
NOTE: The manufacturer strongly recommends
all piping connections, both internal and external
to the unit, be pressure tested by an appropriate
method prior to any finishing of the interior space
or before access to all connections is limited. Test
pressure may not exceed the maximum allowable
pressure for the unit and all components within
the water system. The manufacturer will not be
responsible or liable for damages from water leaks
due to inadequate or lack of a pressurized leak test,
or damages caused by exceeding the maximum
pressure rating during installation.
Unit & System Checkout
CXM Board
Short test pins
together to enter
Test Mode and
speed-up timing
and delays for
20 minutes.
Figure 8: Test Mode Pins
25
Wa t e r- t o - Wa t e r ( 5 0 Y E R ) S e r i e s - P u r o n
®
R e v. : 1 J u l y, 2 0 1 0