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

Table 25 — Approximate Fluid Volume (gal.)
per 100 Ft of Pipe
PIPE DIAMETER (in.)
Copper 1
1.25
1.5
Rubber Hose 1
3
Polyethylene / 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 1.0 gallon.
Table 26 — Antifreeze Percentages by Volume
ANTIFREEZE
Methanol (%)
100% USP Food Grade
Propylene Glycol (%)
Ethenol
Cooling Tower/Boiler Systems —
typically use a common loop temperature maintained at 60 to
95 F. Carrier recommends using a closed circuit evaporative
cooling tower with a secondary heat exchanger between the
tower and the water loop. If an open type cooling tower is used
continuously, chemical treatment and filtering will be necessary.
Ground Coupled, Closed Loop and Plateframe
Heat Exchanger Well Systems —
low water temperatures from 30 to 110 F. The external loop
field is divided up into 2 in. 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 flushing using
only the system pumps. Locate air separation in the piping sys-
tem prior to the fluid re-entering the loop field.

OPERATION

The unit will not operate until all the
Power Up Mode —
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, depend-
ing 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.
VOLUME (gal.)
4.1
6.4
9.2
3.9
2.8
4.5
8.0
10.9
18.0
8.3
10.9
17.0
MINIMUM TEMPERATURE FOR
FREEZE PROTECTION (F)
10 15 20 25
25 21 16 10
38 30 22 15
29 25 20 14
These systems
These systems al-
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 relay
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 tem-
perature is greater than 45 F and FP2 is greater than 110 F.
LOCKOUT MODE — The status LED will flash fast in
Lockout mode and the compressor relay will be turned off
immediately. Lockout mode can be "soft" reset via the Y input
or can be "hard" reset via the disconnect. The last fault causing
the lockout is stored in memory and can be viewed by entering
test mode.
LOCKOUT WITH EMERGENCY HEAT — While in Lock-
out mode, if W becomes active, then Emergency Heat mode
will occur.
EMERGENCY HEAT — In Emergency Heat mode, terminal
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
EXTENDED COMPRESSOR OPERATION MONITOR —
If the compressor has been on for 4 continuous hours the con-
trol will automatically turn off the compressor relay and wait
the short cycle time protection time. All appropriate safeties,
including the low-pressure switch, will be monitored. If all
operations are normal and the compressor demand is still pres-
ent, the control will turn the compressor back on.
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 immediately
once the demand is removed. The control reverts to Heating
Stage 1 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 3 — In Heating Stage 3 mode, the Fan
Enable, Fan Speed and Compressor relays remain on. The EH1
output is turned on immediately. With continuing Heat Stage 3
demand, EH2 will turn on after 10 minutes. EH1 and EH2 are
turned off immediately when the Heating Stage 3 demand is re-
moved. The control reverts to Heating Stage 2 mode.
The output signal EH2 will be off if FP1 is greater than 45 F
AND FP2 (when shorted) is greater than 110 F during Heating
Stage 3 mode. This condition will have a 30-second recogni-
tion time. Also, during Heating Stage 3 mode, EH1, EH2, Fan
Enable, and Fan Speed will be ON if G input is not active.
EMERGENCY HEAT — In Emergency Heat mode, the Fan
Enable and Fan Speed relays are turned on. The EH1 output is
turned on immediately. With continuing Emergency Heat de-
mand, EH2 will turn on after 5 minutes. Fan Enable and Fan
Speed relays are turned off after a 60-second delay. The control
reverts to Standby mode.
38