Installation manual

13
PREMIER INSTALLATION MANUAL
Initial Desuperheater Startup
Plumbing Installation
Remove drain valve and fi tting from water heater.
Thread the 3/4-inch NPT x 3 1/2-inch brass nipple into the water heater drain port.
Attach the center port of the 3/4-inch FPT tee to the opposite end of the brass nipple.
Attach the 1/2-inch SWT x 3/4-inch NPT copper adapter to the side of the tee closest to the unit.
Install the drain valve on the tee opposite the adapter.
Run interconnecting tubing from the tee to DHW “WATER OUT” at the unit.
Cut the cold water “IN” line going to the water heater.
Insert the 3/4-inch x 3/4-inch x 1/2-inch reducing solder tee “IN” line with cold water line as shown.
Run interconnecting copper tubing between the unit DHW “WATER IN” and the tee (1/2-inch nominal) using (2) 1/2-inch
sweat x 1-inch MPT adapters. The recommended maximum distance is 50 ft.
To prevent air entrapment in the system, install a vent coupling at the highest point of the interconnecting lines.
Insulate all exposed surfaces of both connection water lines with 3/8-inch wall closed cell insulation.
Note: All plumbing and piping connections must comply with local plumbing codes .
Desuperheater Startup
1. Close the drain valve to the water heater.
2. Open the cold water supply to the tank.
3. Open the hot water faucet in the house to bleed air from the system. Close when full.
4. Depress the handle on the pressure relief valve to bleed any remaining air from the tank then close.
5. If so equipped, unscrew the indicator plug on the motor end of the pump until all air is purged from the pump, then
tighten the plug. Use vent couplings to bleed air from the lines.
6. Carefully inspect all plumbing for water leaks and correct as required.
7. Before restoring electrical supply to the water heater, adjust the temperature setting on the tank.
• On tanks with both upper and lower elements, the lower element should be turned down to the lowest setting,
approximately 100°F. The upper element should be adjusted to 120°F to 130°F. Depending upon the specifi c
needs of the customer, you may want to adjust the upper element differently.
• On tanks with a single element, lower the thermostat setting to 120°F.
8. After thermostat(s) is adjusted, replace the access cover and restore electrical supply to the water heater.
9. Make sure that any valves in the desuperheater water circulating circuit are open.
10. Turn on the Premier unit to fi rst stage heating.
11. The DHW pump should be running. Be sure the disable switch for the DHW pump (SW4) is ON. The DHW OFF
LED on the unit should not be illuminated.
12. The temperature difference between the water entering and leaving the desuperheater should be 5°F to 15°F. The
water fl ow should be approximately 0.4 GPM per ton of nominal cooling.
13. Allow the unit to heat water for 15 to 20 minutes to be sure operation is normal.
14. When the pump is fi rst started, open the inspection port (if equipped) until water dribbles out, then replace. Allow
the pump to run for at least fi ve minutes to ensure that water has fi lled the circulator properly.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Desuperheater Notes: When servicing a unit’s refrigeration circuit, it is always good practice to disable the desuperheater
pump. This can be accomplished by using the DHW pump disable switch located on the front of the unit cabinet near
the LED annunciator panel. The red DHW OFF LED will illuminate, indicating the DHW pump is disabled.
CAUTION: Never operate the DHW circulating pump while dry. If the unit is placed in operation be-
fore the desuperheater piping is connected, be sure that the pump switch is set to the OFF position.