Field Connected Water Piping - York YAWS018 - 075 Installation Manual

Field Connected Water Piping

General
Each unit is equipped with captive FPT water connections
to eliminate 'egg-shaping' from use of a backup wrench.
For making the water connections to the unit, a Teflon tape
thread sealant is recommended to minimize internal fouling
of the piping. Do not over tighten connections. All supply and
return water piping should be insulated to prevent excess
condensation from forming on the water lines.
NOTE: Units are factory run-tested using propylene
glycol. Prior to connecting piping to unit, thoroughly flush
heat exchangers.
The piping installation should provide service personnel with
the ability to measure water temperatures and pressures.
The water lines should be routed so as not to interfere with
access to the unit. The use of a short length of high pressure
hose with a swivel type fitting may simplify the connections
and prevent vibration. Optional stainless steel hose kits are
available as an accessory item.
Before final connection to the unit, the supply and return
hose kits must be connected, and the system flushed
to remove dirt, piping chips and other foreign material.
Normally, a combination balancing and close-off (ball) valve
is installed at the return, and a rated gate or ball valve is
installed at the supply. The return valve can be adjusted to
obtain the proper water flow. The valves allow the unit to be
removed for servicing.
Typical Open Loop Installation
Line Voltage
Disconnect
Load Liquid
Connections
Flow Regulator Valve
Shut-off Valve
(to isolate solenoid
Solenoid
valve while acid
flushing)
P/T Plugs
Vibration Absorbing
Mesh or Air Pad
AFFINITY SINGLE STAGE HYDRONIC INSTALLATION MANUAL
The proper water flow must be delivered to each unit
whenever the unit heats or cools. To assure proper flow,
the use of pressure/temperature ports is recommended
to determine the flow rate. These ports should be located
adjacent to the supply and return connections on the unit.
The proper flow rate cannot be accurately set without
measuring the water pressure drop through the refrigerant-
to-water heat exchanger (See Pressure Drop Table for water
flow and pressure drop information). Normally about 3 GPM
flow rate per ton of cooling capacity (2.25 GPM per ton
minimum) is needed. Both source as well as load fluid piping
must be at least as large as the unit connections on the heat
pump (larger on long runs).
Never use flexible hoses of a smaller inside diameter than
that of the water connection on the unit and limit hose length
to 10 ft. per connection. Check carefully for water leaks.
CAUTION: Water piping exposed to outside
temperature may be subject to freezing.
Rubber Bladder
Expansion Tank
Valve
Boiler Drains for
HX Flushing
NOTE: Valves and boiler drains must be installed
so the heat exchanger can be acid flushed.
7
Water Out
Water In
Shut-off
Valve