FINAL INSPECTION & START-UP
Start Up
Initiate proper unit start up.
1.
Adjust all hand water valves to full open position. Turn
power on to the units. If when taking old unit out you
marked the position of hand water valve handle put it
back to that position rather than full open.
2.
Operate each unit in cooling cycle
fi
rst.
• Set thermostat temperature lower than room
temperature and depress "Cool" button.
• Entering water temperature (EWT) should be at
least 60°F (16°C). for start up.
• Unit will start discharging cool air.
• After unit has been running about 5 minutes check
temperature of EWT and leaving water temperature
(LWT). difference should show higher LWT by
about 10-12°F (6-7°C). If you
fi
nd you have this
difference you also have correct water
fl
ow. If
the difference is less then 10-12°F (6-7°C) you
have too much water
fl
owing through the unit. If
difference is higher you don’t have enough water
fl
owing through the unit. Adjust the hand water
valve to get the temperature difference needed.
3.
Check unit heating operation. Turn thermostat to
slightly above room temperature. Depress "Heat"
button. Compressor and fan operate. After about 5
minutes of operation check water temperature of EWT
& LWT. For correct water
fl
ow adjust hand valves until
LWT is 6°F (3°C) less than EWT.
4.
Unit Mount ACO (Automatic change-over) with Fan
Cycle Switch (Optional). This option allows evaporator
fan cycle to run continuously. Place switch in cycling
position evaporator fan only runs when unit is calling
for heat or cooling. When switch is placed in “constant”
position, evaporator fan runs continuously unless unit is
physically turned off.
Three factors determine operating limits of RetroAire heat
pump units:
1. Return air temperature
2.
Water
temperature
3.
Ambient
temperature
Whenever any one of these factors is at minimum or
maximum level, other two factors must be at normal levels
to ensure proper unit operation.
Operating Limits
WMH/CM/CW Operating Limits
Air & Water Limits
Cooling°F(°C)
Heating°F(°C)
Min. Ambient Air
50(10)
50(10)
Rated Ambient Air
80(27)
70(21)
Max. Ambient Air
100(38)
85(30)
Mim. EAT
50(10)
70(21)
Rated EAT DB/WB
80/67(27/20)
60(16)
Max. EAT DB/WB
100/83(38/29)
80(27)
Rated *EAT DB/WB
°F
80/67(27/20)
70/60(21/16)
Rated**EWT
°F
85(30)
70(21)
Rated***LWT
°F
95(35)
N/A
Max.EWT
°F
95/71(35/22)
80/67(27/20)
Max.EWT
°F
95(35)
90(33)
Min.*EAT DB/WB
°F
67/57(20/14)
N/A
Min.*EWT
°F
65(19)
N/A
Water Limits
Cooling°F(°C)
Heating°F(°C)
Min. EWT
60(16)
60(16)
Normal EWT
85(30)
70(21)
Max. EWT
95(35)
90(33)
(*'EAT' and Ambient Temperature surrounding the unit are same value)
STARTING CONDITIONS
Unit starts and operates with entering air temperature(EAT)
of 50°F(10°C) and entering water temperature(EWT) of
60°F(16°C) with both air and water at
fl
ow rates used in
AHRI Standard 320/86 rating test, for initial start up in win-
ter. This is start up only, not long running time.
If unit fails to operate:
A. Check voltage and current is in accordance with
electrical speci
fi
cations on unit rating plate.
B. Look for wiring errors. Check for loose terminals or
wire nuts where wire connections have been made
on both line and low-voltage terminal boards.
C. Check for water leaks around hose swivel joints.
If hard piped check all joints. After unit is running
check for leaks around condensate drain hose and
connection.
D. Verify High Pressure Switch (HPS) did not trip.
Cycle system switch off to reset lockout relay.
E. Determine if fan operates during heating and cool-
ing modes.
If these checks fail to reveal a problem and unit will not
operate, contact a service technician for proper diagnosis.
The Right Fit for Comfort
15
Made in USA
