Instruction manual

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Table 19 — 50RHS,RVS,RDS Coaxial

Water Pressure Drop

Antifreeze —

In areas where entering loop temperatures

drop below 40 F 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 15 F below

the lowest expected entering loop temperature. For example, if

the lowest expected entering loop temperature is 30 F, the leav-

ing loop temperature would be 22 to 25 F. Therefore, the freeze

protection should be at 15 F (30 F – 15 F = 15 F).

Calculate the total volume of fluid in the piping system. See

Table 20. Use the percentage by volume in Table 21 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 30 F 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 (anti-

freeze 13 F) set point to avoid nuisance faults.

Table 20 — Approximate Fluid Volume (gal.)

per 100 Ft of Pipe

LEGEND

NOTE: Volume of heat exchanger is approximately 1.0 gallon.

Table 21 — Antifreeze Percentages by Volume

Cooling Tower/Boiler Systems —

These systems typ-

ically use a common loop temperature maintained at 60 to 90 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 continu-

ously, chemical treatment and filtering will be necessary.

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems (50RHR,RVR,

RHS,RVS,RDS Only) —

These systems allow water

temperatures from 30 to 110 F. The external loop field is divid-

ed 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 system prior to the

fluid re-entering the loop field.

OPERATION

Power Up Mode —

The unit will not operate until all 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, 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.

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.

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

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

UNIT

50RHS,RVS,RDS

GPM

WATER TEMPERATURE (F)

30 F 50 F 70 F 90 F

Pressure Drop (psi)

015

1.8 0.6 0.5 0.5 0.5

2.8 1.0 0.9 0.8 0.8

3.8 1.5 1.4 1.3 1.2

018

2.2 0.7 0.7 0.6 0.6

3.5 1.3 1.2 1.1 1.1

4.5 1.8 1.8 1.6 1.5

024

3.0 0.6 0.6 0.5 0.5

4.5 1.1 1.1 1.0 0.9

6.0 1.8 1.7 1.5 1.5

030

3.7 0.8 0.8 0.7 0.7

5.5 1.6 1.4 1.3 1.3

7.5 2.6 2.4 2.2 2.1

036

4.5 1.3 1.2 1.1 1.1

7.0 2.1 1.9 1.8 1.7

9.0 3.9 3.7 3.4 3.2

042

5.2 1.6 1.5 1.4 1.3

8.0 3.2 3.0 2.8 2.6

10.5 5.1 4.7 4.4 4.1

048

6.0 2.1 1.9 1.8 1.7

9.0 3.9 3.7 3.4 3.2

12.0 6.4 5.9 5.5 5.2

060

7.5 1.1 1.0 1.0 0.9

11.3 2.2 2.1 1.9 1.8

15.0 3.6 3.4 3.1 3.0

070

9.0 1.5 1.4 1.3 1.2

13.5 3.0 2.8 2.6 2.5

18.0 5.0 4.7 4.3 4.1

IMPORTANT: All alcohols should be pre-mixed and

pumped from a reservoir outside of the building or

introduced under water level to prevent fuming.

PIPE DIAMETER (in.) VOLUME (gal.)

Copper 14.1

1.25 6.4

1.5 9.2

Rubber Hose 13.9

Polyethylene

IPS SDR11 2.8

1 IPS SDR11 4.5

IPS SDR11 8.0

IPS SDR11 10.9

2 IPS SDR11 18.0

IPS SCH40 8.3

IPS SCH40 10.9

2 IPS SCH40 17.0

IPS — Internal Pipe Size

SCH — Schedule

SDR — Standard Dimensional Ratio

ANTIFREEZE

MINIMUM TEMPERATURE FOR

FREEZE PROTECTION (F)

10 15 20 25

Methanol (%) 25 21 16 10

100% USP Food Grade

Propylene Glycol (%)

38 30 22 15