Comfort-Aire HBH Series 1/2 to 5 Ton - Manual (Page 14)

IOM Instructions HBH/V COMPACT Heat Controller, Inc.
Water-Loop Heat Pump Applications
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 60°F [16°C], 1/2” (13mm) 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 HB 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 12 for connection between the unit and the
piping system.
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 2.25
and 3.5 gpm per ton [2.9 and 4.5 l/m per kW] of cooling
capacity. Heat Controller recommends 3 gpm per ton
[3.9 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 -
90°F [16 - 32°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.
Figure 12: Typical Water-Loop Application
3/8" [10mm] threaded rods
(by others)
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the FP1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 13°F
[-10.6°C]) set point and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual). NOTE:
Low water temperature operation requires extended range
equipment.
Stainless steel braided hoses
with threaded connections
and one swivel end