User Guide

66
Design Guide - HZH/HZV Series
HZ Series 60Hz
Engineering Specications – Page 7
l. fan “ON/AUTO” position of space thermostat as specied above
m. unoccupied/occupied command
n. cooling command
o. heating command
p. fan “ON/AUTO” command
q. fault reset command
r. itemized fault code revealing reason for specic shutdown fault (any one of 7)
FIELD INSTALLED OPTIONS
Hose Kits:
All units shall be connected with hoses. The hoses shall be 2 feet (61cm) long, braided stainless steel; re rated hoses
complete with adapters. Only re rated hoses will be accepted.
Valves:
The following valves are available and will be shipped loose:
a. Ball valve; bronze material, standard port full ow design, FPT connections.
b. Ball valve with memory stop and PT port.
c. “Y” strainer with blowdown valve; bronze material, FPT connections.
d. Motorized water valve; slow acting, 24v, FPT connections.
Hose Kit Assemblies:
The following assemblies ship with the valves already assembled to the hose described:
a. Supply and return hoses having ball valve with PT port.
b. Supply hose having ball valve with PT port; return hose having automatic ow regulator valve with PT ports, and ball valve.
c. Supply hose having “Y” strainer with blowdown valve, and ball valve with PT port; return hose having automatic ow
regulator with PT ports, and ball valve.
d. Supply hose having “Y” strainer with blowdown valve, and ball valve with PT port; return hose having ball valve with PT
port.
Thermostats:
The thermostat shall be a mechanical or electronic type thermostat as selected below with the described features:
a. Thermostat (communicating) (7602-457)
An electronic communicating LCD thermostat shall be provided. The thermostat shall offer three stages of heating and
two stages of cooling with precise temperature control and have a four-wire connection to the unit. The thermostat shall
be capable of manual or automatic change-over operation and shall operate in standard or programmable mode. An
integrated humidity control feature shall be included to control a humidier and/or a dehumidier. The thermostat shall
include a utility demand reduction feature to be initiated by an independent time program or an external input.
The thermostat shall have a comprehensive installation setup menu to include conguration of the unit CFM for each mode
of operation and conguration of the water ow rate through the unit, including variation of the water ow rate based on
the stage of unit operation.
The thermostat shall display system faults with probable cause and troubleshooting guidance. Comprehensive service
diagnostics menus shall display, system inputs, system outputs, conguration settings, Geo source inlet and outlet
temperatures, compressor discharge line temperature, liquid line temperature, leaving air temperature, and entering