C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Consoles
R e v. : 0 8 / 2 4 / 1 5
14
C l i m a t e M a s t e r Wa t e r - S o u rc e H e a t P u m p s
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 50°F [10°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.
Tefl on 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
ClimateMaster in different confi gurations for connection
between the unit and the piping system. Depending upon
selection, hose kits 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 for use in
variable speed pumping systems may also be included in
the hose kit.
The piping system should be fl ushed to remove dirt, piping
chips, and other foreign material prior to operation (see
“Piping System Cleaning and Flushing Procedures” in this
manual). The fl ow 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.
ClimateMaster 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 fl ow verifi cation, 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 fi ltering will be necessary.
Table 2: Antifreeze Percentages by Volume
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze
10.0°F [-12.2°C]) setpoint and avoid nuisance faults (see
“Low Water Temperature Cutout Selection” in this
manual).
Note: Low water temperature operation
requires extended range equipment.
Type
Minimum Temperature for Freeze Protection
10ºF [-12.2ºC]
15ºF [-9.4ºC]
20ºF [6.7ºC]
25ºF [-3.9ºC]
Methanol - 100% USP food grade
25%
21%
16%
10%
Propylene Glycol
38%
30%
22%
15%
