Service manual

THE SMART SOLUTION FOR ENERGY EFFICIENCY
Vertical Stack
Rev.: 11/09/12
15
climatemaster.com
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 ensure 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.
GROUND-LOOP HEAT PUMP APPLICATIONS
Pre-Installation - Prior to installation, locate and mark all
existing underground utilities, piping, etc. Install loops
for new construction before sidewalks, patios, driveways,
and other construction has begun. During construction,
accurately mark all ground loop piping on the plot plan
as an aid in avoiding potential future damage to the
installation.
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth coupled
heat pump systems. Instructions are provided to assist the
contractor in installing trouble free ground loops. These
instructions are recommendations only. State/provincial
and local codes MUST be followed and installation MUST
conform to ALL applicable codes. It is the responsibility of
the installing contractor to determine and comply with ALL
applicable codes and regulations.
CAUTION! Ground loop applications require extended range
equipment and optional refrigerant/water circuit insulation.
 CAUTION! 
 CAUTION! 
Water-Loop Heat Pump Applications
Piping Installation - All earth loop piping materials
should be limited to polyethylene fusion only for in-
ground sections of the loop. Galvanized or steel fi ttings
should not be used at any time due to their tendency to
corrode. All plastic to metal threaded fi ttings should be
avoided due to their potential to leak in earth coupled
applications. A fl anged fi tting should be substituted. P/T
plugs should be used so that fl ow can be measured using
the pressure drop of the unit heat exchanger.
Earth loop temperatures can range between 25 and
110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm
per ton [2.41 to 3.23 l/m per kW] of cooling capacity is
recommended in these applications.
Test individual horizontal loop circuits before backfi lling.
Test vertical U-bends and pond loop assemblies prior to
installation. Pressures of at least 100 psi [689 kPa] should
be used when testing. Do not exceed the pipe pressure
rating. Test entire system when all loops are assembled.