Antifreeze; Cooling Tower/Boiler Systems; Ground Coupled, Closed Loop And Plateframe Heat Exchanger Well Systems; Operation - Carrier AQUAZONE 50HQP072-120 Installation And Service Instructions Manual

or before access to all connections is limited. Test pressure
may not exceed the maximum allowable pressure for the unit
and all components within the water system. Carrier will not
be responsible or liable for damages from water leaks due to
inadequate or lack of a pressurized leak test, or damages
caused by exceeding the maximum pressure rating during
installation.
In areas where entering loop temperatures
Antifreeze —
drop below 4.4 C or where piping will be routed through areas
subject to freezing, antifreeze is needed.
Alcohols and glycols are commonly used as antifreeze
agents. Freeze protection should be maintained to 8.3° C below
the lowest expected entering loop temperature. For example, if
the lowest expected entering loop temperature is –1.1 C, the
leaving loop temperature would be –5.6 to –3.9 C. Therefore,
the freeze protection should be at –9.4 C (–1.1 C – 8.3 C =
–9.4 C).
IMPORTANT: All alcohols should be pre-mixed and
pumped from a reservoir outside of the building or intro-
duced under water level to prevent alcohols from fuming.
Calculate the total volume of fluid in the piping system. See
Table 12. Use the percentage by volume in Table 13 to deter-
mine the amount of antifreeze to use. Antifreeze concentration
should be checked from a well mixed sample using a hydrome-
ter to measure specific gravity.
FREEZE PROTECTION SELECTION — The –1.1 C FP1
factory setting (water) should be used to avoid freeze damage
to the unit.
Once antifreeze is selected, the JW3 jumper (FP1) should
be clipped on the control to select the low temperature
(antifreeze –12.2 C) set point to avoid nuisance faults.
Cooling Tower/Boiler Systems —
typically use a common loop maintained at 15.6 C to 32.2 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.
Table 12 — Approximate Fluid Volume (L)
per 30 M of Pipe
PIPE DIAMETER (in.) [mm] VOLUME (gal.) [L]
Copper 1 [25.4]
1.25 [31.8]
1.5 [38.1]
Rubber Hose 1 [25.4]
Polyethylene 3 / IPS SDR11
4
1 IPS SDR11
1 1 / IPS SDR11
4
1
/ IPS SDR11
2
2 IPS SDR11
1 1 / IPS SCH40
4
1 1 / IPS SCH40
2
2 IPS SCH40
LEGEND
IPS — Internal Pipe Size
SCH — Schedule
SDR — Standard Dimensional Ratio
NOTE: Volume of heat exchanger is approximately 3.78 liters.
Table 13 — Antifreeze Percentages by Volume
MINIMUM TEMPERATURE FOR FREEZE

ANTIFREEZE

–12.2
Methanol (%)
100% USP Food Grade
Propylene Glycol (%)
Ethanol (%)
These systems
4.1 [15.5]
6.4 [24.2]
9.2 [34.8]
3.9 [14.8]
2.8 [10.6]
4.5 [17.0]
8.0 [30.8]
10.9 [41.3]
18.0 [68.1]
8.3 [31.4]
10.9 [41.3]
17.0 [64.4]
PROTECTION (C)
–9.4 –6.7 –3.9
25 21 16 10
38 30 22 15
29 25 20 14
Ground Coupled, Closed Loop and Plateframe
Heat Exchanger Well Systems —
allow water temperatures from –1.1 to 43.3 C. The external
loop field is divided up into 51 mm polyethylene supply and
return lines. Each line has valves connected in such a way
that upon system start-up, each line can be isolated for flush-
ing using only the system pumps. Air separation should be
located in the piping system prior to the fluid re-entering the
loop field.
Power Up Mode —
the inputs, terminals and safety controls are checked for
normal operation.
NOTE: The compressor will have a 5-minute anti-short
cycle upon power up.
Units with Aquazone™ Complete C Control
STANDBY — Y and W terminals are not active in Standby
mode, however the O and G terminals may be active, de-
pending on the application. The compressor will be off.
COOLING — Y and O terminals are active in Cooling
mode. After power up, the first call to the compressor will
initiate a 5 to 80 second random start delay and a 5-minute
anti-short cycle protection time delay. After both delays are
complete, the compressor is energized.
NOTE: On all subsequent compressor calls the random start
delay is omitted.
HEATING STAGE 1 — Terminal Y is active in heating
stage 1. After power up, the first call to the compressor will
initiate a 5 to 80 second random start delay and a 5-minute
anti-short cycle protection time delay. After both delays are
complete, the compressor is energized.
NOTE: On all subsequent compressor calls the random start
delay is omitted.
HEATING STAGE 2 — To enter Stage 2 mode, terminal W
is active (Y is already active). Also, the G terminal must be
active or the W terminal is disregarded. The compressor re-
lay will remain on and EH1 is immediately turned on. EH2
will turn on after 10 minutes of continual stage 2 demand.
NOTE: EH2 will not turn on (or if on, will turn off) if FP1
temperature is greater than 7.2 C and FP2 is greater than
43.3 C.
EMERGENCY HEAT — In emergency heat mode, termi-
nal W is active while terminal Y is not. Terminal G must be
active or the W terminal is disregarded. EH1 is immediately
turned on. EH2 will turn on after 5 minutes of continual
emergency heat demand.

Units with Aquazone Deluxe D Control

STANDBY/FAN ONLY — The compressor will be off.
The Fan Enable, Fan Speed, and reversing valve (RV) relays
will be on if inputs are present. If there is a Fan 1 demand,
the Fan Enable will immediately turn on. If there is a Fan 2
demand, the Fan Enable and Fan Speed will immediately
turn on.
NOTE: DIP switch 5 on S1 does not have an effect upon
Fan 1 and Fan 2 outputs.
HEATING STAGE 1 — In Heating Stage 1 mode, the Fan
Enable and Compressor relays are turned on immediately.
Once the demand is removed, the relays are turned off and
the control reverts to Standby mode. If there is a master/
slave or dual compressor application, all compressor relays
and related functions will operate per their associated DIP
switch 2 setting on S1.
HEATING STAGE 2 — In Heating Stage 2 mode, the Fan
Enable and Compressor relays are remain on. The Fan
Speed relay is turned on immediately and turned off
24
These systems

OPERATION

The unit will not operate until all