Start Up - ECR CM Installation, Operation & Maintenance Manual

Start Up

Use the procedure outlined below to initiate proper unit start up.
1. Adjust all hand water valves to the full open position, and turn
on the power to the units. (If when taking the old unit out you
marked the position of the hand water valve handle put it back to
that position rather than full open.)
2. Operate each unit in the cooling cycle first. Set thermostat
temperature lower than the room temperature and depress the
"Cool" button. The entering water temperature (EWT) should
be at least 60°F(16°C). for start up. The unit will start discharging
cool air almost instantly. After the unit has been running about 5
minutes check the temperature of the EWT and the leaving water
temperature (LWT). The difference should show a higher LWT
by about 10-12°F(6-7°C). If you find you have this difference you
also have the correct water flow. If the difference is less then 10-
12°F (6-7°C) you have too much water flowing through the unit
and if the difference is higher then you don't have enough water
flowing through the unit. You will have to adjust the hand water
valve to get the temperature difference needed.
3. Check the heating operation of the unit, turn the thermostat to
slightly above room temperature and depress the "Heat" button.
The compressor and fan will operate. After about 5 minutes of
operation check the water temperature of the EWT & LWT.
For correct water flow adjust the hand valves until the LWT is
6°F(3°C) less than the EWT.
4. Unit Mount ACO (Automatic change-over) with Fan Cycle
Switch (Optional): This option allows the operator of the CWC/
CWH/CMH to have the evaporator fan cycle or run continuously.
With the switch in the cycling position the evaporator fan will
only run when the unit is calling for heat or cooling. When the
switch is in the "constant" position, the evaporator fan will run
continuously unless the unit is physically turned off.
NOTE: Three factors determine the 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 a minimum or maximum
level, the other two factors must be at normal levels to ensure
proper unit operation.
P/N 240008071, Rev. B [112309]
• Installation, Operation, and Maintenance Manual •
Final Inspection & Start-up
15
Water Source Console Units
(continued)
Operating Limits
WMH Operating Limits
Air & Water Limits
Min. Ambient Air
Rated Ambient Air
Max. Ambient Air
Mim. EAT
Rated EAT DB/WB
Max. EAT DB/WB
Water Limits
Min. EWT
Normal EWT
Max. EWT
CM/CW Operating Limits
Air & Water Limits
Rated *EAT DB/WB °F
Rated**EWT °F
Rated***LWT °F
Max.EWT °F
Max.EWT °F
Min.*EAT DB/WB °F
Min.*EWT °F
Water Limits
Min. EWT °F
Normal EWT °F
Max. EWT °F
(*'EAT' and Ambient Temp. Surrounding the unit are the same value)
STARTING CONDITIONS
Unit will start and operate with entering air temperature(EAT) of
50°F(10°C) and entering water temperature(EWT) of 60°F(16°C)
with both the air and water at the flow rates used in the ARI Stan-
dard 320/86 rating test, for initial start up in winter. This is for start
up only not long time running.
If the unit fails to operate, check the following:
a. Check the voltage and current. it should be in accordance with
the electrical specifications on the unit rating plate.
b. Look for wiring errors. check for loose terminals or wire nuts
where wire connections have been made on both the line and low-
voltage terminal boards.
c. Check for water leaks around hose swivel joints, If hard piped
check all joints. After the unit is running check for leaks around the
condensate drain hose and connection.
d. Ensure the High Pressure Switch (HPS) did not trip. Cycle the
system switch off to reset the lockout relay.
Cooling°F(°C) Heating°F(°C)
50(10) 50(10)
80(27) 70(21)
100(38) 85(30)
50(10) 70(21)
80/67(27/20) 60(16)
100/83(38/29) 80(27)
Cooling °F(°C) Heating °F(°C)
60(16) 60(16)
85(30) 70(21)
95(35) 90(33)
Cooling °F(°C) Heating °F(°C)
80/67(27/20) 70/60(21/16)
85(30) 70(21)
95(35) N/A
95/71(35/22) 80/67(27/20)
95(35) 90(33)
67/57(20/14) N/A
65(19) N/A
Cooling °F(°C) Heating °F(°C)
60(16) 60(16)
85(30) 70(21)
95(35) 90(33)
Made in USA