Zehnder Rittling VS Series Installation, Operation And Maintenance Manual page 51

Unit start-up
procedure
Heating
Adjust the thermostat setting
■
■
to the lowest setting. Place the
thermostat mode switch in the
"HEAT" position.
Incrementally raise the
■
■
thermostat setting 1° every 1
minute until the compressor
activates.
Check for warm air delivery
■
■
within a few minutes after the
unit has begun to operate.
Check the temperature of both
■
■
entering and leaving water. If
temperature is within range,
proceed with the test (see
Table 15). If temperature is
outside of operating range,
check refrigerant pressures.
Check air temperature rise
■
■
across the air coil when
compressor is operating. Air
temperature rise should be
between 20 °F and 30 °F
(11 °C and 17 °C).
Check for vibration, noise, and
■
■
water leaks.
If unit fails to operate, perform
troubleshooting analysis (see
troubleshooting section). If the
check described fails to reveal
the problem and the unit still
does not operate, contact a
trained service technician to
ensure proper diagnosis and
repair of the equipment.
When testing is complete, set
system to maintain desired
comfort level.
Be certain to fill out and
forward all warranty
registration papers to
Zehnder Rittling.
When the disconnect switch
is closed, high voltage is
present in some areas of the
electrical panel. Exercise caution
when working with energized
equipment.
Verify that ALL water control
valves are open and allow
water flow prior to engaging the
compressor. Freezing of the coax
or water lines can permanently
damage the heat pump.
Units have a random 3 to 5
minute time delay in the control
circuit.
If performance during any
mode appears abnormal,
refer to the controls section or
troubleshooting section of this
manual. To obtain maximum
performance, the air coil should
be cleaned before stat-up.
Use a coil cleaner for use on
indoor evaporator refrigeration
equipment.
Start-up 49