Quantech 3070TSE Manual page 54

FORM QTC3-EG6 (1118)
Application Data (Cont'd)
Mounting holes (5/8" diameter) are provided in the steel channel for bolting the unit to its
foundation. See Unit Dimensions on page 26.
For ground level installations, precautions should be taken to protect the unit from tam-
pering by or injury to unauthorized persons. Screws on access panels will prevent casual
tampering; however, further safety precautions, such as unit enclosure options, a fenced-
in enclosure, or locking devices on the panels may be advisable. Check local authorities
for safety regulations.
VARIABLE PRIMARY FLOW
Quantech recommends a maximum 10% per minute flow rate of change, based on design
flow, for variable primary flow applications. Eight to 10 gallons per chiller ton (8.6 to 10.8
liter per cooling kW) is recommended for the system liquid volume. Insufficient system
volume and rapid flow changes can cause control problems or can even cause chiller
shutdowns. There are many other design issues to evaluate with variable primary flow
systems. Consult your Quantech Sales Office for more information about successfully
applying QTC3 chillers.
CHILLED LIQUID PIPING
The chilled liquid piping system should be laid out so that the circulating pump discharges
into the evaporator. The inlet and outlet evaporator liquid connections are given in DI-
MENSIONS.
Hand stop valves are recommended for use in all lines to facilitate servicing. Drain con-
nections should be provided at all low points to permit complete drainage of the evapora-
tor and system piping. Additionally, a strainer (20 mesh) is recommended for use on the
INLET line to the evaporator.
Pressure gauge connections are recommended for installation in the inlet and outlet wa-
ter lines. Gauges are not furnished with the unit and are to be furnished by other suppliers.
The chilled liquid lines that are exposed to outdoor ambients should be wrapped with a
supplemental heater cable and covered with insulation. As an alternative, ethylene glycol
should be added to protect against freeze-up during low ambient periods.
A flow switch is available as an accessory on all units. The flow switch (or its equivalent)
must be installed in the leaving water piping of the evaporator and must not be used to
start and stop the unit.
54 QUANTECH