User Guide
61
Design Guide - HZH/HZV Series
HZ Series 60Hz
Engineering Specications – Page 2
lters factory installed, and factory installed unit-mounting brackets. Vertical units to have eld installed discharge air duct
collar, shipped loose and 1”(25.4mm) lter rails with 1”(25.4mm) lters factory installed. If units with these factory-installed
provisions are not used, the contractor is responsible for any extra costs to eld install these provisions, and/or the extra
costs for his sub-contractor to install these provisions.
All units must have an insulated panel separating the fan compartment from the compressor compartment. Units with the
compressor in the air stream are not acceptable. Units shall have a factory installed 1 inch (25.4mm) wide lter bracket
for lter removal from either side. Units shall have a 1 inch (25.4mm) thick throwaway type glass ber lter. The contractor
shall purchase one spare set of lters and replace factory shipped lters on completion of start-up. Filters shall be
standard sizes. If units utilize non-standard lter sizes then the contractor shall provide 12 spare lters for each unit.
Cabinets shall have separate holes and knockouts for entrance of line voltage and low voltage control wiring. All factory-
installed wiring passing through factory knockouts and openings shall be protected from sheet metal edges at openings
by plastic ferrules. Supply and return water connections shall be copper FPT ttings, and shall be securely mounted
ush to the cabinet corner post allowing for connection to a exible hose without the use of a back-up wrench. Water
connections that protrude through the cabinet or require the use of a backup wrench shall not be allowed. All water
connections and electrical knockouts must be in the compressor compartment corner post as to not interfere with the
serviceability of unit. Contractor shall be responsible for any extra costs involved in the installation of units that do not
have this feature. Contractor must ensure that units can be easily removed for servicing and coordinate locations of
electrical conduit and lights with the electrical contractor.
Option: The unit will be supplied with optional field or factory installed 2” air filter rails (typically used
for free return installation) or 1” or 2” air filter frames with filter access door and return air duct
flanges (typically used for ducted return installation). A corresponding 1” or 2” throwaway type
glass fiber filter will ship with the factory installed filter rails or frame.
Option: The contractor shall install 1 inch MERV 8, 2 inch MERV 11, or 2 inch MERV 13 rated pleated
media disposable air filters on all units.
Option: UltraQuiet package shall consist of high technology sound attenuating material that is
strategically applied to the compressor and air handling compartment casings and fan scroll in
addition to the standard system design, to further dampen and attenuate sound transmissions.
Option: The unit will be supplied with internally factory mounted modulating water valve with delta
T control. The factory built-in valve shall modulate water flow through unit based on a field
adjustable water temperature difference between the entering and leaving water. For two
stage units, the modulating valve will automatically reduce the water flow through the unit
during part load operation to maintain the configured temperature difference. The valve
shall automatically adjust for operating mode, stage of capacity, source water temperature
and variations in external head pressure. The valve will also act as a shut-off valve to prevent
water flow through the unit when the unit is not activated and will have a minimum position
capability.
Option: The unit will be supplied with internally factory mounted variable speed water circulating pump
with internal check valve. The variable speed pump shall modulate water flow through the unit
based on a field adjustable temperature difference between the entering and leaving water.
For two-stage units, the modulating valve will automatically reduce the water flow through the
unit during part load operation to maintain the configured temperature difference. The variable
speed pump shall automatically adjust for operating mode, stage of capacity, source water
temperature, and variations in external head pressure.