York T2GY, Installer'S Manual

Page: 10 / 46

10
T2GY INSTALLER’S GUIDE
Typical open loop piping is shown in the Open System:
Ground Water Application. Always maintain water pressure
in the heat exchanger by placing water control valves at
the outlet of the unit to prevent mineral precipitation. Use
a closed, bladder-type expansion tank to minimize mineral
formation due to air exposure. Ensure proper water flow
through the unit by checking pressure drop across the heat
exchanger and comparing it to the figures in the pressure
drop tables. Normally about 2 GPM flow rate per ton of
cooling capacity (1.5 GPM per ton minimum at 50° F) is
needed in open loop systems.
Open Loop Ground Water Systems
NOTES: For open loop ground water systems or systems
that do not contain and antifreeze solution, set SW2-#2 to
the “Well” position.
Open System: Ground Water Application
Flexible Duct
Collar
Vibration
Absorbing Pad
Drain
Disconnects
(If Applicable)
Auxiliary
Heater
Knockout
Unit
Supply
Aux. Heat
Supply
Rubber Bladder
Expansion Tank
Boiler Drains
For HX Flushing
Strainer
Low Voltage
to Thermostat
and Valve
Unit
Power
Shut Off Valves
(to isolate solenoid
valve while acid flushing)
Shut Off Valves
Water Out
Water In
Solenoid
Valve
Flow Control Valve
(on outlet of
Solenoid Valve)
P/T Plugs
Discharge water from the unit is not contaminated in any
manner and can be disposed of in various ways such as
recharge well, storm sewer, drain field, adjacent stream or
pond, etc. depending on local building codes. Most local
codes forbid the use of sanitary sewer for disposal. Consult
your local building and zoning department to ensure
compliance in your area.
Open Loop Solenoid Valve Connection Option
Typical slow operating external 24V water solenoid valve
(type V) wiring.
C
R
C
W/Y
V Valve
CC
Open Loop Solenoid Valve Connection Option
Typical quick operating external 24V water solenoid valve
(type PPV100 or BPV100) wiring.
C
R
P1
SV
Solenoid
Valve
CC
Open Loop Solenoid Valve Connection Option: Wiring
diagram for dual water valve installations, one type V
slow operating solenoid and one BPV100/PPV100 quick
operating solenoid.
C
W/Y
CCG or CC GND
CC
CC
U
SV
CC2 or CCHI
Logic Board
Taco Valve
V100FPT
(Type V)
BPV/PPV
Solenoid
Compressor
Contactor
Coil