Bard QW3S1, QW4S1, QW5S1 Pressure Service Ports, Piping Access to Unit, Indoor Blower Performance

PRESSURE SERVICE PORTS

High and low pressure service ports are installed on all units so that the system operating pressures can be observed. Pressure charts are located on the backside of the units lower service door, as well as later in this Manual (Table 5). It is imperative to match the correct pressure chart to the unit by model number. All upper service doors must be attached to obtain proper reading. The service ports are in the lower compressor section on the tubing adjacent to the compressor.

PIPING ACCESS TO UNIT

Water piping to and from the coaxial water coil is intended to enter/exit the unit through the rectangular hole (See Figures 1, 8A, 17 and 18). The connections on the water coil are a double O-ring with a retainer nut that secures it in place.

Various double O-ring fittings are available so you may then connect to the coaxial coil with various methods and materials. The methods include 1" barbed fittings (straight and 90°), 1" MPT (straight and 90°), and 1¼" hot fusion fitting with P/T fitting). (See Table 6.)

Note: All double O-ring fittings require “hand tightening only”. Do not use a wrench or pliers as retainer nut can be damaged with excessive force. Avoid cross-threading the nut.

TABLE 4

INDOOR BLOWER PERFORMANCE

		1	4		3
MODEL	RATED		CONTINUOUS	1st STAGE	OPTIONAL	2nd STAGE
	ESP	MAX. ESP	AIRFLOW		2nd STAGE
QW2S1	0.0	0.5	800	800	900	1000
QW3S1	0.0	0.5	800	900	1050	1150
QW4S1	0.0	0.5	900	1150	1225	1350
QW6S1	0.0	0.5	900	1250	1300	1450

NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjusts itself to maintain approximately the same rate of indoor airflow in both heating and cooling, dry and wet coil conditions, and at both 230/208 or 460 volts.

1Maximum ESP (inches WC) shown is with 2" MERV 6 pleated filter.

2 Rated CFM for ducted applications – required for maximum performance rating. To obtain full CFM on models QW3S1, QW4S1 and QW5S1, locate pink wire that is secured to purple wire at low voltage terminal strip in the control box, and attach it to the “Y2” terminal along with the purple wire.

3Optional 2nd Stage CFM – the unit is shipped from the factory set to operate at the optional CFM level shown. This provides lower operating sound levels for non-ducted, free discharge applications. This reduces system capacity performance by approximately 2% at the same energy efficiency.

4 Continuous CFM the total airflow being circulated during continuous blower operation.

Manual	2100-532B
Page	25 of 46