Heat Controller H 006 Installation, Operation And Maintenance Manual page 15

Commercial Water Loop Applications
Commercial systems typically include a number of
units connected to a common piping system. Any unit
plumbing maintenance work can introduce air into the
piping system; therefore air elimination equipment is
a major portion of the mechanical room plumbing. In
piping systems expected to utilize water temperatures
below 50°F [10°C], 1/" (1mm) closed cell insulation is
required on all piping surfaces to eliminate condensation
(extended range units required). Metal to plastic threaded
joints should never be used due to their tendency to leak
over time. A backup wrench must be used for HC series
equipment fittings.
Teflon tape thread sealant is recommended to minimize
internal fouling of the heat exchanger. Do not over tighten
connections and route piping so as not to interfere with
service or maintenance access. Hose kits are available
from Heat Controller in different configurations as shown
in Figure 1 for connection between the unit and the
piping system. Piping may include shut off valves, P/T
plugs for performance measurement, high pressure
stainless steel braided hose, "Y" type strainer with blow
down valve, and/or "J" type swivel connection. Balancing
valves and an external low pressure drop solenoid valve
Figure 12: Typical Water-Loop Application
Optional Auxiliary
electric heater
Supply Air
Insulated supply duct with
at least one 0 deg elbow
to reduce air noise
14
WATER-LOOP HEAT PUMP APPLICATIONS
3/8" [10mm] threaded rods /8" threaded rods
Power Wiring
Unit Power
Aux Electric Heat
Disconnect
Unit Power
Disconnect
Unit Hanger Kits
(included)
for use in variable speed pumping systems may also be
included in the external piping.
The piping system should be flushed to remove dirt,
piping chips, and other foreign material prior to operation
(see "Piping System Cleaning and Flushing Procedures"
in this manual). The flow rate is usually set between .5
and .5 gpm per ton [. and 4.5 l/m per kW] of cooling
capacity. Heat Controller recommends  gpm per ton
[. l/m per kW] for most applications of water loop heat
pumps. To insure proper maintenance and servicing, P/T
ports are imperative for temperature and flow verification,
as well as performance checks.
Water loop heat pump (cooling tower/boiler) systems
typically utilize a common loop, maintained between 60
- 0°F [16 - °C]. The use of a closed circuit evaporative
cooling tower with a secondary heat exchanger between
the tower and the water loop is recommended. If an
open type cooling tower is used continuously, chemical
treatment and filtering will be necessary.
(by others)
Return Air
Thermostat
Wiring
Stainless Steel Braid Hose
with Integral " J" Swivel
Optional Balancing Valve
Optional Low Pressure Drop Water
Control Valve
(can be internally mounted)
Water Out
Water In
Ball Valve with Optional
Integral P/T Plug
Building
Loop