Step 7 - Piping Connections; Water Loop Applications; Ground-Water Applications; Ground-Loop Applications - Carrier Aquazone 50HQL Installation, Start-Up And Service Instructions Manual

Step 7 — Piping Connections —
application, there are 3 types of WSHP piping systems to choose
from: water loop, ground-water and ground loop. Refer to the
Carrier System Design Manual for additional information.
All WSHP units utilize low temperature soldered female
pipe thread fittings for water connections to prevent annealing
and out-of-round leak problems which are typically associated
with high temperature brazed connections. Refer to Tables 1
and 2 for connection sizes. When making piping connections,
consider the following:
• A backup wrench must be used when making screw con-
nections to unit to prevent internal damage to piping.
• Insulation may be required on piping to avoid condensa-
tion in the case where fluid in loop piping operates at
temperatures below dew point of adjacent air.
• Piping systems that contain steel pipes or fittings may
be subject to galvanic corrosion. Dielectric fittings may
be used to isolate the steel parts of the system to avoid
galvanic corrosion.
WATER LOOP APPLICATIONS — Water loop applications
usually include a number of units plumbed to a common pip-
ing system. Maintenance to any of these units can introduce air
into the piping system. Therefore, air elimination equipment
comprises a major portion of the mechanical room plumbing.
The flow rate is usually set between 2.25 and 3 gpm per ton
of cooling capacity. For proper maintenance and servicing,
pressure-temperature (P/T) ports are necessary for temperature
and flow verification.
In addition to complying with any applicable codes, consid-
er the following for system piping:
• Piping systems utilizing water temperatures below
1
50 F require / -in. closed cell insulation on all piping
2
surfaces to eliminate condensation.
• All plastic to metal threaded fittings should be avoided
due to the potential to leak. Use a flange fitted substitute.
• Teflon tape thread sealant is recommended to minimize
internal fouling of the heat exchanger.
• Use backup wrench. Do not overtighten connections.
• Route piping to avoid service access areas to unit.
• The piping system should be flushed prior to operation to
remove dirt and foreign materials from the system.
GROUND-WATER APPLICATIONS — Typical ground-
water piping is shown in Fig. 7. In addition to complying with
any applicable codes, consider the following for system
piping:
• Install shut-off valves for servicing.
• Install pressure-temperature plugs to measure flow and
temperature.
• Boiler drains and other valves should be connected using
a "T" connector to allow acid flushing for the heat
exchanger.
• Do not overtighten connections.
• Route piping to avoid service access areas to unit.
• Use PVC SCH80 or copper piping material.
NOTE: PVC SCH40 should not be used due to system high
pressure and temperature extremes.
Water Supply and Quantity — Check water supply. Water
supply should be plentiful and of good quality. See Table 3 for
water quality guidelines.
IMPORTANT: Failure to comply with the above required
water quality and quantity limitations and the closed-
system application design requirements may cause damage
to the tube-in-tube heat exchanger that is not the responsi-
bility of the manufacturer.
Depending on the
through the heat exchanger must fall within the ranges listed in
the Water Quality Guidelines table. Consult a local water treat-
ment firm, independent testing facility, or local water authority
for specific recommendations to maintain water quality within
the published limits.
GROUND-LOOP APPLICATIONS — Temperatures be-
tween 25 to 110 F and a cooling capacity of 2.25 to 3 gpm
of flow per ton is recommended. In addition to complying
with any applicable codes, consider the following for sys-
tem piping:
• Piping materials should be limited to only polyethylene
• Galvanized or steel fittings should not be used at any
• All plastic to metal threaded fittings should be avoided
• Do not overtighten connections.
• Route piping to avoid service access areas to unit.
• Pressure-temperature (P/T) plugs should be used to mea-
Step 8 — Electrical Wiring
MUST comply with the National Electrical Code (NEC) as
well as applicable local codes. In addition, all field wiring must
conform to the Class II temperature limitations described in the
NEC.
and a schematic of the field connections which must be made
by the installing (or electrical) contractor.
compressor access panel to ensure proper electrical hookup.
The installing (or electrical) contractor must make the field
connections when using field-supplied disconnect.
shown in Electrical Data shown in Tables 4A and 4B.
ble conduit to minimize vibration and sound transmission to
the building.
POWER CONNECTION — Line voltage connection is
made by connecting the incoming line voltage wires to the
L side of the CC terminal. See Tables 4A and 4B for correct
wire and maximum overcurrent protection sizing.
12
In all applications, the quality of the water circulated
fusion in the buried sections of the loop.
time due to corrosion.
due to the potential to leak. Use a flange fitted substitute.
sure flow of pressure drop.
To avoid possible injury or death due to electrical shock,
open the power supply disconnect switch and secure it in
an open position during installation.
Use only copper conductors for field-installed electrical
wiring. Unit terminals are not designed to accept other
types of conductors.
All field installed wiring, including the electrical ground,
Refer to unit wiring diagrams Fig. 8A-10B for fuse sizes
Consult the unit wiring diagram located on the inside of the
Operating voltage must be the same voltage and phase as
Make all final electrical connections with a length of flexi-