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Table 6 — DIP Switch Block S2 —
Accessory 1 Relay Options
ACCESSORY 1
RELAY OPTIONS
Cycle with Fan
Digital NSB
Water Valve — Slow Opening
OAD
LEGEND
NSB — Night Setback
OAD — Outside Air Damper
NOTE: All other DIP switch combinations are invalid.
Table 7 — DIP Switch Block S2 —
Accessory 2 Relay Options
ACCESSORY 2
RELAY OPTIONS
Cycle with Fan
Digital NSB
Water Valve — Slow Opening
OAD
LEGEND
NSB — Night Setback
OAD — Outside Air Damper
NOTE: All other switch combinations are invalid.
Auto Dehumidification Mode or High Fan Mode — Switch 7
provides selection of auto dehumidification fan mode or high
fan mode. In auto dehumidification fan mode the fan speed
relay will remain off during cooling stage 2 if terminal H is
active. In high fan mode, the fan enable and fan speed relays
will turn on when terminal H is active. Set the switch to ON for
auto dehumidification fan mode or to OFF for high fan mode.
Switch 8 — Not used.
D Control Accessory Relay Configurations —
The following accessory relay settings are applicable for both
D controls only:
CYCLE WITH FAN — In this configuration, the relay will be
ON any time the Fan Enable relay is on.
CYCLE WITH COMPRESSOR — In this configuration, the
relay will be ON any time the Compressor relay is on.
DIGITAL NIGHT SET BACK (NSB) — In this configura-
tion, the relay will be ON if the NSB input is connected to
ground C.
NOTE: If there are no relays configured for digital NSB, then
the NSB and OVR inputs are automatically configured for
mechanical operation.
MECHANICAL NIGHT SET BACK — When NSB input is
connected to ground C, all thermostat inputs are ignored. A
thermostat set back heating call will then be connected to the
OVR input. If OVR input becomes active, then the D control
will enter Night Low Limit (NLL) staged heating mode. The
NLL staged heating mode will then provide heating during the
NSB period.
WATER VALVE (SLOW OPENING) — If relay is config-
ured for Water Valve (slow opening), the relay will start 60 sec-
onds prior to starting compressor relay.
OUTSIDE AIR DAMPER (OAD) — If relay is configured
for OAD, the relay will normally be ON any time the Fan
Enable relay is energized. The relay will not start for 30 min-
utes following a return to normal mode from NSB, when NSB
is no longer connected to ground C. After 30 minutes, the relay
will start if the Fan Enable is set to ON.
DIP SWITCH POSITION
1
2
3
On
On
On
Off
On
On
On
Off
On
On
On
Off
DIP SWITCH POSITION
4
5
6
On
On
On
Off
On
On
On
Off
On
On
On
Off
30
To avoid equipment damage, DO NOT leave system filled
in a building without heat during the winter unless anti-
freeze is added to system water. Condenser coils never
fully drain by themselves and will freeze unless winterized
with antifreeze.
START-UP
Use the procedure outlined below to initiate proper unit
start-up.
NOTE: This equipment is designed for indoor installation only.
Operating Limits
ENVIRONMENT — This equipment is designed for indoor
installation ONLY. Extreme variations in temperature, humidi-
ty and corrosive water or air will adversely affect the unit per-
formance, reliability and service life.
POWER SUPPLY — A voltage variation of ± 10% of name-
plate utilization voltage is acceptable.
UNIT STARTING CONDITIONS — All units start and op-
erate in an ambient of 45 F with entering air at 40 F, entering
water at 20 F and with both air and water at the flow rates used.
NOTE: These operating conditions are not normal or continu-
ous operating conditions. It is assumed that such a start-up is
for the purpose of bringing the building space up to occupancy
temperature.
When the disconnect switch is closed, high voltage is
present in some areas of the electrical panel. Exercise
caution when working with the energized equipment.
Start Up System
1. Restore power to system.
2. Turn thermostat fan position to ON. Blower should start.
3. Balance airflow at registers.
4. Adjust all valves to the full open position and turn on the
line power to all heat pump units.
5. Operate unit in the cooling cycle. Room temperature
should be approximately 45 to 100 F dry bulb. Loop
water temperature entering the heat pumps should be
between 40 and 90 F.
NOTE: Three factors determine the operating limits of a
unit: (1) entering air temperature, (2) water temperature and
(3) ambient temperature. Whenever any of these factors are
at a minimum or maximum level, the other two factors must
be at a normal level to ensure proper unit operation. See
Table 8.
Table 8 — 50HQL,VQL Units
Operating Limits
AIR LIMITS
Min. Ambient Air
Rated Ambient Air
Max. Ambient Air
Min. Ent. Air
Normal Entering Air db/wb
Max. Entering Air db/wb
WATER LIMITS
Min. Entering Water
Normal Entering Water
Max. Entering Water
LEGEND
db
—
Dry Bulb
wb —
Wet Bulb
*With antifreeze, optional extended range insulation and low temperature cut-
out jumper clipped for antifreeze.
COOLING (F)
HEATING (F)
45
45
80
70
100
85
50
40
75/63-80/67
70
110/83
80
*30
45 (*20)
40-90
40-90
110
90
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