START UP PROCEDURE FOR CLOSED LOOP SYSTEM
1.Be sure main power to the unit is OFF at disconnect.
2.Set thermostat system switch to OFF, fan switch to AUTO.
3.Move main power disconnect to ON. Except as required for safety while servicing, Do not open the unit disconnect switch.
4.Check system air flow for obstructions.
A.Move thermostat fan switch to ON. Blower runs.
B.Be sure all registers and grilles are open.
C.Move thermostat fan switch to AUTO. Blowing should stop.
5.Flush, fill and pressurize the closed loop system as outlined in manual
6.Fully open the manual inlet and outlet valves. Start the loop pump module circulator(s) and check for proper operation. If circulator(s) are not operating, turn off power and diagnose the problem.
7.Check fluid flow using a direct reading flow meter or a single water pressure gauge, measure the pressure drop at the pressure/temperature plugs across the water coil. Compare the measurement with flow versus pressure drop table to determine the actual flow rate. If the flow rate is too low, recheck the selection of the loop pump module
model for sufficient capacity. If the module selection is correct, there is probably trapped air or a restriction in the piping circuit.
8.Start the unit in cooling mode by moving the thermostat switch to cool. Fan should be set for AUTO.
9.Check the system refrigerant pressures against the cooling refrigerant pressure table in the installation manual for rated water flow and entering water temperatures. If the refrigerant pressures do not match, check for airflow problem then refrigeration system problem.
10.Switch the unit to the heating mode by moving the thermostat switch to heat. Fan should be set for AUTO.
11.Check the refrigerant system pressures against the heating refrigerant pressure table in installation manual. Once again, if they do not match, check for airflow problems and then refrigeration system problems.
NOTE: If a charge problem is determined (high or low):
A.Check for possible refrigerant leaks.
B.Recover all remaining refrigerant from unit and repair leak.
C.Evacuate unit down to 29 inches of vacuum
D.Recharge the unit with refrigerant by weight. This is the only way to insure a proper charge.
FIGURE 20
WATER TEMPERATURE and PRESSURE PROCEDURE
Thermometer
Dial face pressure guage with guage adaptor
50 | 60 | 70 | Retaining cap, hand tighten only |
| |||
40 |
| 80 | |
30 |
|
| 90 |
20 |
|
| 100 |
10 |
|
| 110 |
0 |
|
| 120 |
Pete's test plug
Test plug cap
Barbed 90° adapter
Manual | |
Page | 31 of 46 |
